Journal articles: 'Wireless communication systems Wireless communication systems Integrated circuits'

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Hannachi, C., D. Hammou, T. Djerafi, Z. Ouardirhi, and S. O. Tatu. "Complete Characterization of Novel MHMICs for V-Band Communication Systems." Journal of Electrical and Computer Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/686708.

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This paper presents the characterization results of several new passive millimeter wave circuits integrated on very thin ceramic substrate. The work is focused on the design and characterization of a novel rounded Wilkinson power divider, a 90° hybrid coupler, a rat-race coupler, and a novel six-port (multiport) circuit. Measurements show the wideband characteristics, allowing therefore their use for multi-Gb/s V-band wireless communication systems.

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Liang, Chuan, Guang Hui Cai, Peng Li, and Shu Wen Zheng. "Design and Implementation of an OFDM System with Interleaving and De-Interleaving Based on FPGA." Advanced Materials Research 1008-1009 (August 2014): 1497–500. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.1497.

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Today's wireless communication has become the primary means of communication, the wireless communication relative to wired communications, its random parameter channel delay problem and fading problem raising a new challenge to the reliability of communication. This article describes the basic principle of OFDM system with interleaving and de-interleaving, Verification platform to build on this basis, and using EDA tools Quartus II functional and timing verify the correctness, Giving the integrated circuit simulation results, also showing the use of FPGA to achieve interleave and interleaving process well in OFDM systems. Effectively improve the reliability of the system, not only meet the needs of Systems on flexibility and real-time, but also occupy less hardware resources, fast, and consistent with the development trend of modern communications.

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Burns, L. M. "Applications for GaAs and silicon integrated circuits in next generation wireless communication systems." IEEE Journal of Solid-State Circuits 30, no. 10 (1995): 1088–95. http://dx.doi.org/10.1109/4.466074.

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Nwajana, Augustine O., Gerald K. Ijemaru, Kenneth L. M. Ang, Jasmine K. P. Seng, and Kenneth S. K. Yeo. "Unbalanced Two-Way Filtering Power Splitter for Wireless Communication Systems." Electronics 10, no. 5 (March 6, 2021): 617. http://dx.doi.org/10.3390/electronics10050617.

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A compact unbalanced two-way filtering power splitter with an integrated Chebyshev filtering function is presented. The design is purely based on formulations, thereby eliminating the constant need for developing complex optimization algorithms and tuning, to deliver the desired amount of power at each of the two output ports. To achieve miniaturization, a common square open-loop resonator (SOLR) is used to distribute energy between the two integrated channel filters. In addition to distributing energy, the common resonator also contributes one pole to each integrated channel filter, hence, reducing the number of individual resonating elements used in achieving the integrated filtering power splitter (FPS). To demonstrate the proposed design technique, a prototype FPS centered at 2.6 GHz with a 3 dB fractional bandwidth of 3% is designed and simulated. The circuit model and layout results show good performances of high selectivity, less than 1.7 dB insertion loss, and better than 16 dB in-band return loss. The common microstrip SOLR and the microstrip hair-pin resonators used in implementing the proposed integrated FPS ensures that an overall compact size of 0.34 λg × 0.11 λg was achieved, where λg is the guided-wavelength of the 50 Ω microstrip line at the fundamental resonant frequency of the FPS passband.

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Fan, X., G. Fischer, and B. Dietrich. "An integrated 3.1–5.1 GHz pulse generator for ultra-wideband wireless localization systems." Advances in Radio Science 4 (September 6, 2006): 247–50. http://dx.doi.org/10.5194/ars-4-247-2006.

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Abstract. This paper presents an implementation of an integrated Ultra-wideband (UWB), Binary-Phase Shift Keying (BPSK) Gaussian modulated pulse generator. VCO, multiplier and passive Gaussian filter are the key components. The VCO provides the carrier frequency of 4.1 GHz, the LC Gaussian filter is responsible for the pulse shaping in the baseband. Multiplying the baseband pulse and the VCO frequency shifts the pulse to the desired center frequency. The generated Gaussian pulse ocupppies the frequency range from 3.1 to 5.1 GHz with the center frequency at 4.1 GHz. Simulations and measured results show that this spectrum fulfills the mask for indoor communication systems given by the FCC (Federal Communications Commission, 2002). The total power consumption is 55 mW using a supply voltage of 2.5 V. Circuits are realized using the IHP 0.25 μm SiGe:C BiCMOS technology.

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Dan, Iulia, Guillaume Ducournau, Shintaro Hisatake, Pascal Szriftgiser, Ralf-Peter Braun, and Ingmar Kallfass. "A superheterodyne 300 GHz wireless link for ultra-fast terahertz communication systems." International Journal of Microwave and Wireless Technologies 12, no. 7 (May 19, 2020): 578–87. http://dx.doi.org/10.1017/s1759078720000495.

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A superheterodyne transmission scheme is adopted and analyzed in a 300 GHz wireless point-to-point link. This was realized using two different intermediate frequency (IF) systems. The first uses fast digital synthesis which provides an IF signal centered around a carrier frequency of 10 GHz. The second involves the usage of commercially available mixers, which work as direct up- and down-converters, to generate the IF input and output. The radio frequency components are based on millimeterwave monolithic integrated circuits at a center frequency of 300 GHz. Transmission experiments over distances up to 10 m are carried out. Data rates of up to 60 Gbps using the first IF option and up to 24 Gbps using the second IF option are achieved. Modulation formats up to 32QAM are successfully transmitted. The linearity of this link and of its components is analyzed in detail. Two local oscillators (LOs), a photonics-based source and a commercially available electronic source are employed and compared. This work validates the concept of superheterodyne architecture for integration in a beyond-5G network, supplying important guidelines that have to be taken into account in the design steps of a future wireless system.

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Brandl, P., and H. Zimmermann. "Development of an optoelectronic integrated circuit for indoor optical wireless communication systems." Transactions on Emerging Telecommunications Technologies 25, no. 6 (January 15, 2014): 629–37. http://dx.doi.org/10.1002/ett.2777.

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SCHLECHTWEG, M. "HIGH FREQUENCY CIRCUITS BASED ON GaAs PHEMT TECHNOLOGY FOR MODERN SENSOR AND COMMUNICATION SYSTEMS." International Journal of High Speed Electronics and Systems 10, no. 01 (March 2000): 393–411. http://dx.doi.org/10.1142/s0129156400000404.

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For sensor and communication system applications, monolithic microwave integrated circuits (MMICs) feature performance, functionality, reliability, and competitive price. In this paper, the potential of PHEMT ICs for communication and sensor applications up to 100 GHz is discussed. Specifically, I will address the application of coplanar waveguide technology for rf ICs, millimeter-wave multifunctional ICs and power amplifiers, as well as mixed-signal ICs and OEICs. A 77-GHz transceiver MMIC designed for automotive collision avoidance radar is presented as an example of a very compact, multifunctional mm-wave chip. A chip set for active and passive imaging at 94 GHz includes low noise and high gain amplifiers, low phase noise oscillators, and phase shifters. An FMCW module is conceived for material characterization. A family of coplanar power amplifier MMICs for wireless communication in the range of 20 to 60 GHz with output powers up to 1 W is presented. Finally, integrated circuits for high-speed data transmission at 40 Gbit/s will be discussed.

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Mukherjee, Chhandak, Marina Deng, Virginie Nodjiadjim, Muriel Riet, Colin Mismer, Djeber Guendouz, Christophe Caillaud, et al. "Towards Monolithic Indium Phosphide (InP)-Based Electronic Photonic Technologies for beyond 5G Communication Systems." Applied Sciences 11, no. 5 (March 8, 2021): 2393. http://dx.doi.org/10.3390/app11052393.

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This review paper reports the prerequisites of a monolithic integrated terahertz (THz) technology capable of meeting the network capacity requirements of beyond-5G wireless communications system (WCS). Keeping in mind that the terahertz signal generation for the beyond-5G networks relies on the technology power loss management, we propose a single computationally efficient software design tool featuring cutting-edge optical devices and high speed III–V electronics for the design of optoelectronic integrated circuits (OEICs) monolithically integrated on a single Indium-Phosphide (InP) die. Through the implementation of accurate and SPICE (Simulation Program with Integrated Circuit Emphasis)-compatible compact models of uni-traveling carrier photodiodes (UTC-PDs) and InP double heterojunction bipolar transistors (DHBTs), we demonstrated that the next generation of THz technologies for beyond-5G networks requires (i) a multi-physical understanding of their operation described through electrical, photonic and thermal equations, (ii) dedicated test structures for characterization in the frequency range higher than 110 GHz, (iii) a dedicated parameter extraction procedure, along with (iv) a circuit reliability assessment methodology. Developed on the research and development activities achieved in the past two decades, we detailed each part of the multiphysics design optimization approach while ensuring technology power loss management through a holistic procedure compatible with existing software tools and design flow for the timely and cost-effective achievement of THz OEICs.

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Zhu, Li, Fei Wang, and Hongli Zhao. "QoS-Aware Resource Allocation for Network Virtualization in an Integrated Train Ground Communication System." Wireless Communications and Mobile Computing 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/2653405.

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Urban rail transit plays an increasingly important role in urbanization processes. Communications-Based Train Control (CBTC) Systems, Passenger Information Systems (PIS), and Closed Circuit Television (CCTV) are key applications of urban rail transit to ensure its normal operation. In existing urban rail transit systems, different applications are deployed with independent train ground communication systems. When the train ground communication systems are built repeatedly, limited wireless spectrum will be wasted, and the maintenance work will also become complicated. In this paper, we design a network virtualization based integrated train ground communication system, in which all the applications in urban rail transit can share the same physical infrastructure. In order to better satisfy the Quality of Service (QoS) requirement of each application, this paper proposes a virtual resource allocation algorithm based on QoS guarantee, base station load balance, and application station fairness. Moreover, with the latest achievement of distributed convex optimization, we exploit a novel distributed optimization method based on alternating direction method of multipliers (ADMM) to solve the virtual resource allocation problem. Extensive simulation results indicate that the QoS of the designed integrated train ground communication system can be improved significantly using the proposed algorithm.

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Ali, Liakot, and Farshad. "Analog hardware trojan design and detection in OFDM based wireless cryptographic ICs." PLOS ONE 16, no. 7 (July 29, 2021): e0254903. http://dx.doi.org/10.1371/journal.pone.0254903.

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Due to Hardware Trojan (HT), trustworthiness of Integrated Circuit (IC) supply chain is a burning issue in Semiconductor Industry nowadays. Over the last decade, extensive research has been carried on HT detection methods for digital circuits. However, the HT issue remains largely unexplored in the domain of Analog Mixed Signal (AMS)/ RF circuit where it is now an appealing target for the attackers. The increasing popularity of Orthogonal Frequency Division Multiplexing (OFDM) based wireless cryptographic ICs in modern communication systems makes it a lucrative target for HT-based attacks which could have a devastating impact on data security. This paper presents a trigger-based Hardware Trojan Threat model that exploits the extended cyclic prefix (ECP) property of the OFDM communication scheme to leak the secret encryption key over low noise Additive White Gaussian Channel (AWGN) and developed a Cyclic Prefix (CP) checker based detection mechanism named “SENTRY” to detect such trojans once it is triggered.

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Prochaska, M., A. Belski, and W. Mathis. "Design and Analysis of Fully Integrated Differential VCOs." Advances in Radio Science 3 (May 13, 2005): 359–63. http://dx.doi.org/10.5194/ars-3-359-2005.

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Abstract. Oscillators play a decisive role for electronic equipment in many fields - like communication, navigation or data processing. Especially oscillators are key building blocks in integrated transceivers for wired and wireless communication systems. In this context the study of fully integrated differential VCOs has received attention. In this paper we present an analytic analysis of the steady state oscillation of integrated differential VCOs which is based on a nonlinear model of the oscillator. The outcomes of this are design formulas for the amplitude as well as the stability of the oscillator which take the nonlinearity of the circuit into account.

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Li, Weiping, Zongxi Tang, and Xin Cao. "Design of a Narrow Bandwidth Bandpass Filter Using Compact Spiral Resonator with Chirality." Active and Passive Electronic Components 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/7074392.

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In this article, a compact narrow-bandpass filter with high selectivity and improved rejection level is presented. For miniaturization, a pair of double negative (DNG) cells consisting of quasi-planar chiral resonators are cascaded and electrically loaded to a microstrip transmission line; short ended stubs are introduced to expand upper rejection band. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measured results are in good agreement with the simulated ones. By comparing to other filters in the references, it is shown that the proposed filter has the advantage of skirt selectivity and compact size, so it can be integrated more conveniently in modern wireless communication systems and microwave planar circuits.

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Erofeev, Evgeny, Vadim Arykov, Michael Stepanenko, Aleksei Voevodin, Aleksei Kogai, and Vladimir Kurikalov. "28 GHz Single-Chip Transmit RF Front-End MMIC for Multichannel 5G Wireless Communications." Symmetry 12, no. 7 (July 14, 2020): 1167. http://dx.doi.org/10.3390/sym12071167.

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Millimeter-wave wireless networks of the new fifth generation (5G) have become a primary focus in the development of the information and telecommunication industries. It is expected that 5G wireless networks will increase the data rates and reduce network latencies by an order of magnitude, which will create new telecommunication services for all sectors of the economy. New electronic components such as 28 GHz (27.5 to 28.35 GHz) single-chip transmit radio frequency (RF) front-end monolithic microwave integrated circuits (MMICs) will be required for the performance and power consumption of millimeter-wave (mm-wave) 5G communication systems. This component includes a 6-bit digital phase shifter, a driver amplifier and a power amplifier. The output power P3dB and power-added efficiency (PAE) are 29 dBm and 19.2% at 28 GHz. The phase shifter root-mean-square (RMS) phase and gain errors are 3° and 0.6 dB at 28 GHz. The chip dimensions are 4.35 × 4.40 mm.

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Dai, Ming, Qi Wang, and Wan Qin Wu. "Development of a Wearable Biosensor System for Ubiquitous Healthcare Applications." Applied Mechanics and Materials 670-671 (October 2014): 1256–59. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.1256.

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With the development of wearable computing, wireless communication and artificial intelligence technology, the physiological monitoring systems for homecare applications achieved more and more attention. It is a challenge to design a fully integrated circuit satisfying the requirements of wearable biosensor system, such as small size, low power consumption, wireless transmission, and high signal noise rate (SNR). Based on these considerations, we recently developed a fully-integrated circuit for a wearable biosensor system to measure multiple vital signs in real time, meanwhile, we adopted FIR notch filter to remove the 50Hz power line interference and used cubic spline interpolation to reduce baseline drift noise. The experimental results showed that this wearable system ran well, which could be applied for real-time and ubiquitous healthcare in daily life.

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Tamrin, M. S., and M. R. Ahmad. "Simulation of adaptive power management circuit for hybrid energy harvester and real-time sensing application." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 2 (June 1, 2020): 658. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp658-666.

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Many wireless sensor network (WSN) applications, nowadays, require real-time communication, which demands cautious design consideration to resolve inherent conflicts between energy efficiency and the need to meet Quality of Services (QoS), such as end-to-end delay communications. Numerous innovative solutions are proposed such as Real-time Power-Aware Routing (RPAR) protocol, which dynamically adapts transmission power to meet specified communication delays at low energy cost. Hence, to enable real-time communication with RPAR protocol, an adaptive Power Management Circuit (PMC) using hybrid energy harvester to support WSN real-time communication is proposed. In this paper, a high-level architecture of the proposed PMC is discussed, which consists of Thermal Energy Generator (TEG), and Piezoelectric Energy Harvester (PEG) as energy providers, with low-power Maximum Power Point Tracking (MPPT) feature enabled. Preliminary simulations which analyze and characterize TEG and PEG system are conducted separately to determine the optimal design parameters to support the conventional WSN QoS requirement. Next, both systems will be integrated into a single PMC implementation prior to fabrication and lab characterization.

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Mabrok, Mussa, Zahriladha Zakaria, Yully Erwanti Masrukin, Tole Sutikno, and Hussein Alsariera. "Effect of the defected microstrip structure shapes on the performance of dual-band bandpass filter for wireless communications." Bulletin of Electrical Engineering and Informatics 10, no. 1 (February 1, 2021): 232–40. http://dx.doi.org/10.11591/eei.v10i1.2662.

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Due to the progression growth of multiservice wireless communication systems in a single device, multiband bandpass filter has attract a great attention to the end user. Therefore, multiband bandpass filter is a crucial component in the multiband transceivers systems which can support multiple services in one device. This paper presents a design of dual-band bandpass filter at 2.4 GHz and 3.5 GHz for WLAN and WiMAX applications. Firstly, the wideband bandpass filter is designed at a center frequency of 3 GHz based on quarter-wavelength short circuited stub. Three types of defected microstrip structure (DMS) are implemented to produce a wide notch band, which are T-inversed shape, C-shape, and U- Shape. Based on the performance comparisons, U-shaped DMS is selected to be integrated with the bandpass filter. The designed filter achieved two passbands centered at 2.51 GHz and 3.59 GHz with 3 dB bandwidth of 15.94 % and 15.86 %. The proposed design is very useful for wireless communication systems and its applications such as WLAN and WiMAX

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Lubaszewski, Marcelo, and Marcelo Antonio Pavanello. "Table of Contents and Foreword." Journal of Integrated Circuits and Systems 7, no. 1 (December 27, 2012): 1–6. http://dx.doi.org/10.29292/jics.v7i1.350.

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This issue of the Journal of Integrated Circuits and Systems (JICS) features a very broad content, including papers on analog and digital design, presenting novel solutions for circuit synthesis, energy efficiency, memory architectures and processor modeling and also proposing new approaches for wireless communication, motion estimation and neural networks applications. Six of these papers have been selected from the presentations given at SBCCI2011 (24th Symposium on Integrated Circuits and Systems Design), which has been held in João Pessoa, Brazil in 2011. Among the contributions presented at the Symposium, only a few best rated were selected by the JICS Editorial Board and have been invited to submit an extended version to the Journal. These papers have been reviewed by external experts and have been accepted for the special section on best SBCCI2011 papers. In addition to the best papers presented at the conference, one spontaneous submission passed through the usual reviewing process and has been accepted as a regular paper. We would like to thank the authors for their effort in preparing these high quality papers, as well as the reviewers for their help on paper selection, which guarantees the scientific level of this issue.We sincerely hope that JICS readers will enjoy these contributions.Marcelo Lubaszewski - JICS Editor-in-chief Marcelo Antonio Pavanello - JICS Co-Editor

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Li, Jiayang. "Applications of Wireless Communication in a New Dual Branch CTS Charge Pump Based on Employing Clock Matched Technology." Wireless Communications and Mobile Computing 2021 (August 14, 2021): 1–9. http://dx.doi.org/10.1155/2021/4014795.

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With the increase in communication requirements, new communication technologies and implementation methods have developed rapidly. The rise of emerging markets such as the Internet of Things, smart homes, smart cities, and wearables has promoted the development of wireless communication integrated circuits in the direction of monolithic, low energy consumption, and high energy efficiency. This paper proposes a new dual branch charge pump based on CTS charge pump with enhanced current drive capability and undesired charge transfer completely eliminated. Clock matched technology is proposed to completely eliminate undesired charge transfer caused by delay turn on and off of the auxiliary transistors in the traditional CTS charge pump. The current drive capability is enhanced by employing NMOS transistors with 2Vdd gate drive voltage, while traditional dual branch CTS charge pumps are based on PMOS with 1Vdd gate drive voltage. The output voltage ripple is also reduced resulting from a dual branch structure. Simulation results of output voltage gain and power efficiency for the proposed charge pump and other traditional charge pumps are provided. Comparisons are made to show the improvement of the proposed charge pump compared with other traditional charge pumps.

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Mabrok, Mussa, Zahriladha Zakaria, Nurhana Abu Hussin, and Mohamad Ariffin Mutalib. "Microwave Bandpass Filter Integrated with Notch Response for Wide-band Applications." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 2 (August 1, 2018): 797. http://dx.doi.org/10.11591/ijeecs.v11.i2.pp797-804.

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This paper presents the design of wide-band bandpass filter using microstrip structure at 3-6GHz with fractional bandwidth of 66.67% based upon short-circuited stubs structure of 5th degree. In order to avoid the interference from existing system that operates in the frequency band, the folded stepped impedance resonator (SIR) was introduced to generate a narrow notch band at 5.2GHz. Pin diode is employ as switching mechanism for the notch response. This design is simulated by Advance Design System (ADS) software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508mm and loss tangent 0.0019.The achieved return loss is better than 15dB and insertion loss is less than 1dB.The designed filter can be used in microwave communication systems such as wireless communication devices and military applications (radar system).

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Qiao, Shuaiqing, Hongmei Duan, Qisheng Zhang, Qimao Zhang, Shuhan Li, Shenghui Liu, Shiyang Liu, et al. "Development of high-precision distributed wireless microseismic acquisition stations." Geoscientific Instrumentation, Methods and Data Systems 7, no. 3 (September 27, 2018): 253–63. http://dx.doi.org/10.5194/gi-7-253-2018.

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Abstract. In recent years, owing to the shortage of oil and gas resources and increasing difficulty in mining, traditional (wired) microseismic monitoring equipment has been unable to meet the needs of energy exploitation. Therefore, it is necessary to develop new high-precision seismic exploration and data acquisition systems. In this study, we combined advanced acquisition systems with wireless technology to develop a new wireless microseismic acquisition system. The hardware circuit of the acquisition system mainly includes a data acquisition board and a main control board. High-precision analog-to-digital conversion and digital filtering technologies are used to provide data with high signal-to-noise ratios, resolution, and fidelity to the acquisition stations. Key technologies were integrated into the ARM (Advanced RISC Machines) of the main control board: reliable GPS technology was employed to realize synchronous acquisitions among various acquisition stations, and WIFI technology was used to achieve wireless data communication between acquisition stations and the central station, thus improving the data transmission speed and accuracy. After conducting a series of evaluation tests, it was found that the system was stable, convenient to use, and had high data accuracy, therefore providing significant support for the solution to problems encountered in current oil and gas exploration processes, such as the complicated environment and inconvenient construction.

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Butryn, Igor, Krzysztof Siwiec, and Witold Adam Pleskacz. "Hybrid Cross Coupled Differential Pair and Colpitts Quadrature Digitally Controlled Oscillator Architecture." Electronics 10, no. 10 (May 11, 2021): 1132. http://dx.doi.org/10.3390/electronics10101132.

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Growing importance of wireless communication systems forces reduction of power consumption of the designed integrated circuits. The paper focuses on minimization of power consumption in a digitally controlled oscillator (DCO) that can be employed as oscillator in GPS/Galileo receiver. The new hybrid architecture of DCO combines good phase noise performance of a Colpitts oscillator and relaxed startup conditions of a cross-coupled differential pair oscillator. The proposed new DCO generates a quadrature signal in a current reused frequency divider. Such solution allows of the dissipated power to be reduced. The DCO has been implemented in 110 nm CMOS technology. It generates output signal in frequency range from 1.52 GHz to 1.6 GHz and consumes 1.1 mW from 1.5 V supply voltage. The measured phase noise equals −116 dBc/Hz at 1 MHz offset from 1.575 GHz output signal.

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Es-saqy, Abdelhafid, Maryam Abata, Mahmoud Mehdi, Said Mazer, Mohammed Fattah, Moulhime El Bekkali, and Catherine Algani. "28 GHz balanced pHEMT VCO with low phase noise and high output power performance for 5G mm-Wave systems." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (October 1, 2020): 4623. http://dx.doi.org/10.11591/ijece.v10i5.pp4623-4630.

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This paper presents the study and design of a balanced voltage controlled oscillator VCO for 5G wireless communication systems. This circuit is designed in monolithic microwave integrated circuit (MMIC) technology using PH15 process from UMS foundry. The VCO ensures an adequate tuning range by a single-ended pHEMT varactors configuration. The simulation results show that this circuit delivers a sinusoidal signal of output power around 9 dBm with a second harmonic rejection between 25.87 and 33.83 dB, the oscillation frequency varies between 26.46 and 28.90 GHz, the phase noise is -113.155 and -133.167 dBc/Hz respectively at 1 MHz and 10 MHz offset and the Figure of Merit is -181.06 dBc/Hz. The power consumed by the VCO is 122 mW. The oscillator layout with bias and RF output pads occupies an area of 0.515 mm2.

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Wang, Zhenye, Xiwang Dai, and Wen Sun. "Tri-beam slot antenna array based on substrate integrated waveguide (SIW) technology." International Journal of Microwave and Wireless Technologies 12, no. 3 (September 20, 2019): 246–51. http://dx.doi.org/10.1017/s1759078719001260.

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AbstractA novel tri-beam slot antenna array based on substrate integrated waveguide (SIW) technology is proposed in this paper. The beam forming network is a 3 × 3 Butler matrix consisted of three couplers and four phase shifters. A 1.76 dB coupler is located between two 3 dB couplers, with this arrangement; the input signal can be divided into three parts with the same amplitude and certain phase differences. Two parallel slots are cut off broadside of SIW transmission line, which constitutes the basic unit of the antenna array. A 3 × 2 slot antenna array is connected with this circuit. Three beams with the directions of −30, 0 and 30° are produced when different ports are excited, respectively. The S parameters, radiation patterns, and gains are simulated and measured, which show that it can be a candidate for multi-beam wireless communication systems.

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Al-Khateeb, Khalid A. S., and Wajdi F. Al-Khateeb. "DESIGN AND PERFORMANCE ANALYSIS OF VCO FOR STANDARD GSM USING MEMS." IIUM Engineering Journal 11, no. 1 (May 26, 2010): 41–49. http://dx.doi.org/10.31436/iiumej.v11i1.40.

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The design of a prototype monolithic Micro Electro-Mechanical Systems (MEMS) electronic circuits, namely the Voltage Controlled Oscillators (VCOs) is presented. The components can achieve the stringent requirements of wireless communication applications such as GSM cellular telephony. The VCO meets the low phase noise specifications of -136 dBc/Hz at large offset frequency of 3MHz, over the appropriate frequency range. The model of the monolithic VCO is based on the topology of the Colpitts Oscillator. It is relatively less complicated, which facilitates the practical integration of the MEMS components into the configuration. The variable capacitor and the monolithic 3-D coil inductor are suitable for low phase-noise and low power consumption at the application frequencies. A PSpice simulation model was developed with MEMS switching devices that can be integrated into the system. The model helps in determining the design parameters, which affect the performance and operation reliability of the RF transceiver system, for which a prototype has been tested and proved successful.

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Hrishikeshavan, Vikram, and Inderjit Chopra. "Refined lightweight inertial navigation system for micro air vehicle applications." International Journal of Micro Air Vehicles 9, no. 2 (June 2017): 124–35. http://dx.doi.org/10.1177/1756829316682534.

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This paper discusses the design, hardware and software methodology, and testing of an ultralight inertial navigation system (Embedded Lightweight Kinematic Autopilot-Revised (ELKA-R)) that can be used as a controller in a wide range of micro air vehicle systems. ELKA-R was designed using the 32-bit low-power ARM Cortex-M4 microprocessor as the microcontroller unit. The microcontroller unit interfaced with state of the art 9 degrees-of-freedom inertial measurement unit using inter-integrated circuit communication (I2C) protocol. A wireless transceiver was also incorporated with serial peripheral interface to wirelessly coordinate pilot inputs and sensor information with a remote basestation. Multiple timer protocols were configured to generate individual driver signals to a wide variety of motor and actuator configurations. The printed circuit board was designed as a four layer layout. ELKA-R weighed 1.7 g with a board area of 4.82 cm2, thus making it one of the smallest and lightest kinematic autopilots in open literature that can be applied to any generic micro air vehicle system. ELKA-R was tested on a variety of micro air vehicle flight demonstrators. Hover stabilization rates of 1000 Hz were achieved which were comparable to the autopilots on larger quad rotor systems such as DJI Phantom and AR-Drone. Oscillations in attitude were reduced by up to 50%–70% when compared with a previous generation lightweight autopilot.

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Wang, Tianyun, Zeji Chen, Qianqian Jia, Quan Yuan, Jinling Yang, and Fuhua Yang. "A Novel High Q Lamé-Mode Bulk Resonator with Low Bias Voltage." Micromachines 11, no. 8 (July 29, 2020): 737. http://dx.doi.org/10.3390/mi11080737.

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This work reports a novel silicon on insulator (SOI)-based high quality factor (Q factor) Lamé-mode bulk resonator which can be driven into vibration by a bias voltage as low as 3 V. A SOI-based fabrication process was developed to produce the resonators with 70 nm air gaps, which have a high resonance frequency of 51.3 MHz and high Q factors over 8000 in air and over 30,000 in vacuum. The high Q values, nano-scale air gaps, and large electrode area greatly improve the capacitive transduction efficiency, which decreases the bias voltage for the high-stiffness bulk mode resonators with high Q. The resonator showed the nonlinear behavior. The proposed resonator can be applied to construct a wireless communication system with low power consumption and integrated circuit (IC) integration.

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Feng, Wu Shiung, and Yi Jung Chen. "Evaluation of Silicon Nitride MIM Capacitors for MMIC Applications." Applied Mechanics and Materials 397-400 (September 2013): 1873–77. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1873.

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With the rapid development and huge requirements of wireless communication systems, microwave-monolithic Integrated circuits (MMIC) with high performance and reliability have become very popular and been developed rapidly. The nitride quality and the reliability of the metal-insulator-metal (MIM) capacitor can be also researched based on time-dependent dielectric breakdown (TDDB) theory. In this paper, the various Si3N4 capacitors having different area sizes, aspect ratios and corners were designed with respect to nitride quality and lifetime evaluation. All of MIM capacitors used in this study are manufactured using a special reliability mask, and the test structures include various sizes of capacitors ranging from 10Kμm2 to 250Kμm2 as well as capacitor corner check. The ramp voltage and the constant voltage tests are destructive oftentimes to identify the cause of dielectric failure. Combining these breakdown marks with an optical microscope inspection and cross section check of the 10Kμm2 capacitors as well as corner-structure check are reported in this paper. That can make the identification and classification of dielectric breakdown mechanisms. When the capacitor size is larger than that of 65K-um2, the factor of failure acceleration raises significantly.

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Qi, Wen. "A Design Exploration of Intelligent Wearable Companion of Smartphone for Fitness and Healthcare." International Journal of Pattern Recognition and Artificial Intelligence 33, no. 08 (June 25, 2019): 1959023. http://dx.doi.org/10.1142/s0218001419590237.

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Wearable devices are increasingly gaining more attentions in healthcare and fitness industry due to their potentials to measure valuable physiological signals on the move. There are many researchers who have proposed different types of designs that embed biosensors into miniature wearable devices. In this paper, we present a wearable companion that monitors the cardiac activities of a wearer with smartphone. The device makes use of a single, integrated biosensor that is designed with a unique analog front-end circuitry and a dedicated signal processing pipeline. In order to meet the requirements of possible but different user scenarios, three types of product forms are presented. The experimental results show that electrocardiogram (ECG) signals collected are valid and consistent through the systems. Future topics include adding extra algorithms to remove motion artifacts in order to achieve better signal quality in various settings and include wireless communication through 4G.

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Madhevan, B., R. Sakkaravarthi, G. Mandeep Singh, R. Diya, and Durgesh Kumar Jha. "Modelling, Simulation and Mechatronics Design of a Wireless Automatic Fire Fighting Surveillance Robot." Defence Science Journal 67, no. 5 (September 19, 2017): 572. http://dx.doi.org/10.14429/dsj.67.10237.

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<span>The aim of this study is to design and develop an autonomous fire proof rescue robot. The robot is designed in such a way, that it can traverse through fire and hazardous situations. Further, it will sense and communicate information regarding these situations in real time with the server. The robot is fixed with multi-sensors and further, a driver circuit has been integrated for communication in these hazardous situations through Zigbee and a data acquisition system (DAQ). In mechanical design first, a 3D solid model is generated using Solid works software to understand the basic structure of robot which provides information regarding robotic platform, size and location of various components. The developed fire fighting robot is a predominately outdoor ground-based mobile robotic system with onboard subdual systems that can traverse autonomously in the hazardous environment. The robot is designed such that it can traverse into the fire and send information regarding the fire behaviour and also the images of the victim’s location by using a camera. Further, a mathematical model which describes the kinematics and dynamic behaviour of robot motion are done. V-REP is used to create the simulation of the robot in a fire simulated fire environment. Finally, for the path planning, various techniques are discussed such as V-REPs inbuilt path planning module, A*, Fuzzy logic and artificial potential fields.</span>

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Batenkov, Aleksandr, Kirill Batenkov, and Aleksandr Fokin. "Methods for Formation of Telecommunication Network States Sets for Different Measures of Connectivity." SPIIRAS Proceedings 19, no. 3 (June 1, 2020): 644–73. http://dx.doi.org/10.15622/sp.2020.19.3.7.

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Reliability, survivability, and stability analysis tasks are typical not only for telecommunications, but also for systems whose components are subject to one or more types of failures, such as transport, power, mechanical systems, integrated circuits, and even software. The logical approach involves the decomposition of the system into a number of small functional elements, and within telecommunications networks they are usually separate network devices (switches, routers, terminals, etc.), as well as communication lines between them (copper-core, fiber-optic, coaxial cables, wireless media, and other transmission media). Functional relationships also define logical relationships between the failures of individual elements and the failure of the network as a whole. The assumption is also used that device failures are relatively less likely than communication line failures, which implies using the assumption of absolute stability (reliability, survivability) of these devices. Model of a telecommunication network in the form of the generalized model of Erdos–Renyi is presented. In the context of the stability of the telecommunications network, the analyzed property is understood as the connectivity of the network in one form or another. Based on the concept of stochastic connectivity of a network, as the correspondence of a random graph of the connectivity property between a given set of vertices, three connectivity measures are traditionally distinguished: two-pole, multi-pole, and all-pole. The procedures for forming an arbitrary structure of sets of paths and trees for networks are presented, as well as their generalization of multipolar trees. It is noted that multipolar trees are the most common concept of relatively simple chains and spanning trees. Solving such problems will allow us to proceed to calculating the probability of connectivity of graphs for various connectivity measures.

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Shetty, Mamtha. "Design of BPSK Modulator Using VHDL." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 13, no. 12 (October 23, 2014): 5247–52. http://dx.doi.org/10.24297/ijct.v13i12.5276.

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Binary Phase Shift Keying represents the simulation results of binary digital modulation schemes. Here for BASK and BPSK modulation techniques use FPGA algorithm. If multiplier block is used for multiplication bit stream with carrier signal, used time will rises. In addition using multiplier block obtained simulation results were analyzed and compared to other simulation results. Source consumptions of FPGA-based BASK modulation technique and BPSK modulation technique were compared. Also, for different modulation algorithm, source consumptions of BASK and BPSK modulation technique were analyzed using VHDL. Designed modulators using VHSIC (Very High Speed Integrated Circuit) Hardware Description Language (VHDL) was realized on high speed FPGA (Field Program Programmable Gate Array). Because for used modulation technique data rate transfer is fairly important in wireless communication systems. The highest speed data rate transfer can be realized using fiber optic cables. In addition, BER (Bit Error Rate) of BASK and BPSK modulator was compared using MATLAB simulation program. Binary data rate is same for BPSK and BASK. BPSK and BASK modulations were designed on FPGA using VHDL hardware description language.

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Venu Madhav, P., and Dr M SivaGanga Prasad. "Topology Optimization of Dual Octagonal Array antenna for low frequency applications." International Journal of Engineering & Technology 7, no. 2.17 (April 15, 2018): 13. http://dx.doi.org/10.14419/ijet.v7i2.17.11552.

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Objectives: Efficient antenna design for use in communication systems is altering the face of the antenna modeling. The ever-increasing demand for portable and efficient antennas is making researchers to develop innovative models [1] using advanced antenna modeling tools that comply with industrial needs and standards. Methods/Statistical Analysis: Antennas with lower operating frequencies have the major constraints on its size, efficiency and gain. Study on matching techniques, feeding techniques was also to be considered.Findings: Micro strip patch antennas offers considerable amount of radiation, low cost when fabricated on FR4, light weight and are conformable to suite any application. This paper projects the design, simulation and testing of a dual octagonal patch, the topology algorithm [3] is used to optimize the size and shape of the patch where octagons are spaced in the form of an array to address optimization on size and fits into wireless applications. Application/Improvements: The proposed model is tested in the standard antenna test bench comprising of microwave integrated circuit analyzer receiver MIC10kit and found to operate at a resonant frequency of 1.8 GHz with good radiation characteristics.

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Pakhomov, Yu, N. Shulga, and L. Piddubna. "ON THE QUESTION OF THE EFFECTIVENESS OF NETWORK TECHNOLOGIES IN AUTOMATED GAS SUPPLY SYSTEMS." Municipal economy of cities 1, no. 161 (March 26, 2021): 267–73. http://dx.doi.org/10.33042/2522-1809-2021-1-161-267-273.

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The topical issues of development of automated control systems of gas control stations (GCS) and ways of reliable and economical functioning of the gas supply system in modern conditions have been considered in the article. The implementation of European innovative technologies, which are associated with using the modern equipment, telemetry tools to transmit the equipment operation parameters to the dispatcher control panel are the one of the ways to increase the safety and efficiency of GCS performance. The characteristic of the modern complex of telemetry, the raising of efficiency, reliability and safe operation of the gas supply systems due to the possibility of monitoring, technological control and management from the central dispatcher control room are given. The complex of telemetry helps to prevent emergency situations at facilities and to ensure control over unauthorized entry into the GCS premises by unauthorized persons. The article discusses the use of the automated system of operative-dispatching management (ASODM). It is a multi-level automated system that ensures the reliable functioning of the gas supply system at all levels of the hierarchy. It has been shown that the result of the creation of the ASODM are equipping of the control object with microprocessor control and management devices, the integration of various automation tools into a single information management system. It has been proven that the development of ASODM of GCS on the basis of local control and management modules using traditional approaches to creation of automation systems and using the cellular telephone communication as data transmission channels based on GSM-technologies are most rational. The digital control device, which is made on the technological platform of the programmable logic integrated circuit (PLIC), is the main element of the local control and management module. Digital control device (PLIC controller) is a relatively inexpensive and reliable equipment in an automated local GCS control system. The method of data transmission via GSM / GPRS wireless communication channel is considered. The use of GSM-modems and GPRS technology allows to remove restrictions on the distance of data transmission, as well as allows to fully automate the process of transmission and processing of information. The use of GSM / GPRS-technologies in the vehicles of the emergency dispatch service is also shown. The dispatcher can fully monitor the movement of the car with registration on the map of the city where the car is located.

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Hu, Shanwen, Yunqing Hu, Yiting Gao, Xiaodong Zhang, Xinlei Zhang, Zixuan Wang, Bo Zhou, Zhikuang Cai, and Yufeng Guo. "A Compact UWB Bandpass Chip Filter on a GaAs Substrate with Modified Chebyshev Structure." Electronics 9, no. 2 (February 11, 2020): 313. http://dx.doi.org/10.3390/electronics9020313.

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Ultra-Wideband (UWB) systems are widely used in low-power, high-speed, high-security short-range wireless communication systems throughout digital homes and offices. In the RF front-end of a UWB system, bandpass filters (BPFs) are used to put through the passband signals and reject the stopband signals. Most UWB BPFs are designed with dielectric materials on circuit boards or LTCC technology. In this paper, a very compact fully integrated UWB chip filter is proposed and designed on a GaAs substrate with nitride as dielectric layers to meet the small size requirement of portable devices for next-generation UWB applications. The filter is constructed with a modified Chebyshev structure. The final filter circuit contains only four inductors instead of six for the conventional Chebyshev filter, which makes the chip more compact and cost effective. The filter is designed and fabricated on a 0.25 μm GaAs pHEMT technology with a chip size of only 0.73 mm × 0.51 mm including the chip edge and scribe line area, while the filter core area is only 0.61 mm × 0.39 mm, including bonding PADs. The measurement results illustrated that the proposed BPF shows a passband covering the frequency range of 3.1–9.0 GHz, the minimum passband insertion loss is only 1.5 dB, the stopband rejection is better than −30 dB throughout frequencies below 2 GHz and above 12 GHz, S11 is less than −16 dB, and S22 is better than −11 dB during the whole passband range. It demonstrated that the proposed filter can be considered as one of the most compact UWB filters.

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Alshehri, Abdallah A., Carlos H. Martins, Shih-Chun Lin, Ian F. Akyildiz, and Howard K. Schmidt. "FracBot Technology for Mapping Hydraulic Fractures." SPE Journal 26, no. 02 (February 5, 2021): 610–26. http://dx.doi.org/10.2118/187196-pa.

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Summary Miniaturized transponder systems are under development for monitoring unconventional reservoirs, mapping hydraulic fractures, and determining other wellbore parameters. These gadgets are an extension of radio-frequency identification (RFID) and are known as fracture robot (FracBot) nodes to recognize wireless underground sensor networks (WUSNs) for characterization and mapping of hydraulic breakages in unconventional reservoirs. 3D constellation maps of proppant-bed placement are generated by autonomous localization algorithms as FracBots are injected during hydraulic-fracturing operations. To investigate this model, a FracBot platform was established to explore this concept, and three basic functions have been explained. First, we have developed an innovative cross-layer communication model for magnetic-induction (MI) networks in altering underground environments, coupled with selections of coding, modulation, and power control and a geographic forwarding structure. Second, we have developed an innovative MI-based localization framework to capture the locations of the randomly deployed FracBot nodes by exploiting the exceptional properties of the MI field. Third, we have proposed an energy model for a linear FracBot network scheme that provides reasonable data rates while preserving collected energy limitations. Finally, to examine the functionalities of FracBot nodes in air, sand, and stone media, a physical MI-based WUSN test bed was implemented. Experiments indicated that the constructed FracBots can form a communication link and transfer data over amplitude-shift keying (ASK) modulation with 1.6 kbit/sec as a data rate and a minimum receiver sensitivity of −70 dBm. The performance of near-field-communication (NFC) antennas was affected by sand and stone media, which ultimately affect MI signal propagation and decrease the energy transfer. In sand or stone media, augmented mismatch between transmitter and receiver antennas was detected, leading to the decision that an advanced matching circuit design or an adaptive-frequency feature should be integrated into the FracBot design. This permits an optimal energy transmission and consistent communication link through sand and stone media.

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Esashi, Masayoshi, Shuji Tanaka, Seiji Aoyagi, Takashi Mineta, Koichi Suzumori, Tetsuji Dohi, and Norihisa Miki. "Special Issue on MEMS for Robotics and Mechatronics." Journal of Robotics and Mechatronics 32, no. 2 (April 20, 2020): 279–80. http://dx.doi.org/10.20965/jrm.2020.p0279.

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MEMS (Micro Electro Mechanical Systems) is a technology that is used to incorporate sensors, actuators, microstructures, and circuits on chips by using a combination of various technologies with semiconductor process. MEMS are also used in robotics and mechatronics since they can provide compact, low-cost functional components that play crucial roles in their respective systems. We would like to elaborate on the history of MEMS technology, whose initial development started around 1970. In 1960s, Dr. Isemi Igarashi of Toyota Central R&D Labs., Inc. in Japan developed a semiconductor pressure sensor of piezo-resistance type. In 1980s, the pressure sensors were used to control automobile engines to clear exhaust gas regulations and thus contributed to solving environmental issues. In 1990s, semiconductor acceleration sensors were used for passive safety technologies to detect collision of automobiles and activate air bags, which resulted in decrease in traffic fatalities. In 2000s, an active safety system with gyro sensors was developed to detect and control spinning of a vehicle. In future, space recognition sensors with optical scanners to measure light propagation time and detect distance to an object will be used for autonomous driving. For smartphones, a microphone, an acceleration sensor, and a gyro sensor are used in user interface, and a film bulk acoustic wave resonator (FBAR) is used in a wireless communication filter. For projectors, the built-in circuit of a mirror array system is used to move mirrors placed in an array. After the development of projectors, films have not been used in movie theaters. MEMS are also widely used in medical and biological fields, such as blood pressure measurement. Esashi began research on a semiconductor ion sensor ISFET (ion sensitive field effect transistor) in 1971. ISFET detects ion concentration in electrolyte by exposing the insulating film of an insulated gate transistor to the liquid. He set up a prototyping facility when he was a graduate student and wrote only one paper on this research, although the prototyping facility was used afterwards. The ion sensor was certified under the Pharmaceutical Affairs Law after a 12-year application process and was used as catheter-type pH sensor to diagnose reflux esophagitis. MEMS are widely used for minimally invasive medical treatment, which causes minimum damage to human body. Moreover, MEMS are used as disposable sensors to prevent infection or as implanted devices. In addition, MEMS are used for production inspection and scientific instrument, including scanning probe microscopes (SPMs), which observe atoms using extremely small nano-probes, and probe cards that simultaneously test several integrated circuits on a wafer using aligned probes. When he was an associate professor, Esashi improved the prototyping facility that he made when he was a student and made a large scale integrated circuit (LSI). After he became a professor, he accepted researchers from more than 130 companies and developed MEMS using the prototyping facility to develop a product through the academia-industry collaboration. He realized integrated MEMS by combining LSI and MEMS. This includes a system of many tactile sensors attached on the body surface of a safe robot for real-time detection of contact through packet communication. After he retired from the university, he developed a “prototype coin laundry,” which enables companies to do develop without having their own prototyping facility. The prototype coin laundry is a system where engineers can use the prototyping facility to develop devices, and the system has been managed by successors. Unlike integrated circuits for which standardization is easy, standardization of MEMS is challenging because of difficulty in development. It is necessary to access various knowledge for the development of MEMS, and he has made efforts to provide the knowledge. Finally, we would like to thank authors who submitted papers to this Special Issue on MEMS for Robotics and Mechatronics as well as those who were involved in editing and reviewing the papers. We sincerely hope for further development in this field of research.

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BAHL, INDER J. "MONOLITHIC MICROWAVE INTEGRATED CIRCUITS BASED ON GaAs MESFET TECHNOLOGY." International Journal of High Speed Electronics and Systems 06, no. 01 (March 1995): 91–124. http://dx.doi.org/10.1142/s0129156495000031.

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Advanced military microwave systems are demanding increased integration, reliability, radiation hardness, compact size and lower cost when produced in large volume, whereas the microwave commercial market, including wireless communications, mandates low cost circuits. Monolithic Microwave Integrated Circuit (MMIC) technology provides an economically viable approach to meeting these needs. In this paper the design considerations for several types of MMICs and their performance status are presented. Multi-function integrated circuits that advance the MMIC technology are described, including integrated microwave/digital functions and a highly integrated transceiver at C-band.

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Qiao, Luyan, Rui Li, Ying Han, Feng Wei, Yong Yang, Xiaoning Yang, and Nankai Wu. "A Balanced Filtering Directional Coupler with Wide Common-Mode Suppression Based on Slotline Structure." Electronics 10, no. 18 (September 14, 2021): 2254. http://dx.doi.org/10.3390/electronics10182254.

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In this paper, a balanced-to-balanced filtering directional coupler (FDC) that can realize a 3 dB coupling degree directional coupler with high isolation and directivity is proposed. The design of the proposed FDC is primarily based on microstrip/slotline transition structures, resonance structures, and odd–even mode phase velocity compensation structures. A U-type microstrip feed line integrated with a stepped-impedance slotline resonator is adopted at the input and output ports, which makes the differential-mode (DM) responses independent of the common-mode (CM) ones, and brings superior DM transmission and CM suppression. In addition, by loading the microstrip stub-loaded resonators (SLRs), a DM passband with sharp filtering performance is realized, and transmission zeros (TZs) can be added into the design, which makes it more selective. Moreover, phase compensating slotlines are added into the coupling structure to enhance the isolation. In order to verify the feasibility of the proposed design method, an FDC prototype circuit was made and tested. The simulation results are in good agreement with the measured results. The designed coupler’s DM operating band covers 2.65 GHz to 3 GHz (FBW = 12.4%), and the insertion and return losses are 4.6 dB and 20 dB, respectively. The isolation degree is better than 15 dB, and the CM suppression is more than 55 dB. The total coupler size is about 67.7 mm × 63.8 mm. The designed balanced-to-balanced FDC can be widely used in S-band wireless communication systems.

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Lu, Dingqing, and Zhengrong Zhou. "Integrated solutions for testing wireless communication systems." IEEE Communications Magazine 49, no. 6 (June 2011): 96–100. http://dx.doi.org/10.1109/mcom.2011.5783992.

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Yin, Lu, Jiameng Cao, Kaiqin Lin, Zhongliang Deng, and Qiang Ni. "A Novel Positioning-Communication Integrated Signal in Wireless Communication Systems." IEEE Wireless Communications Letters 8, no. 5 (October 2019): 1353–56. http://dx.doi.org/10.1109/lwc.2019.2917670.

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Lee, Yongho, Shinil Chang, Jungah Kim, and Hyunchol Shin. "A CMOS RF Receiver with Improved Resilience to OFDM-Induced Second-Order Intermodulation Distortion for MedRadio Biomedical Devices and Sensors." Sensors 21, no. 16 (August 5, 2021): 5303. http://dx.doi.org/10.3390/s21165303.

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A MedRadio RF receiver integrated circuit for implanted and wearable biomedical devices must be resilient to the out-of-band (OOB) orthogonal frequency division modulation (OFDM) blocker. As the OFDM is widely adopted for various broadcasting and communication systems in the ultra-high frequency (UHF) band, the selectivity performance of the MedRadio RF receiver can severely deteriorate by the second-order intermodulation (IM2) distortion induced by the OOB OFDM blocker. An analytical investigation shows how the OFDM-induced IM2 distortion power can be translated to an equivalent two-tone-induced IM2 distortion power. It makes the OFDM-induced IM2 analysis and characterization process for a MedRadio RF receiver much simpler and more straightforward. A MedRadio RF receiver integrated circuit with a significantly improved resilience to the OOB IM2 distortion is designed in 65 nm complementary metal-oxide-semiconductor (CMOS). The designed RF receiver is based on low-IF architecture, comprising a low-noise amplifier, single-to-differential transconductance stage, quadrature passive mixer, trans-impedance amplifier (TIA), image-rejecting complex bandpass filter, and fractional phase-locked loop synthesizer. We describe design techniques for the IM2 calibration through the gate bias tuning at the mixer, and the dc offset calibration that overcomes the conflict with the preceding IM2 calibration through the body bias tuning at the TIA. Measured results show that the OOB carrier-to-interference ratio (CIR) performance is significantly improved by 4–11 dB through the proposed IM2 calibration. The measured maximum tolerable CIR is found to be between −40.2 and −71.2 dBc for the two-tone blocker condition and between −70 and −77 dBc for the single-tone blocker condition. The analytical and experimental results of this work will be essential to improve the selectivity performance of a MedRadio RF receiver against the OOB OFDM-blocker-induced IM2 distortion and, thus, improve the robustness of the biomedical devices in harsh wireless environments in the MedRadio and UHF bands.

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Watanabe, Osamu, Takafumi Yamaji, Tetsuro Itakura, Shoji Otaka, and Ichiro Hattori. "Trend of wireless communication systems and wide-band circuits." Electronics and Communications in Japan (Part III: Fundamental Electronic Science) 88, no. 4 (2004): 1–10. http://dx.doi.org/10.1002/ecjc.20146.

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Nguyen, Hieu Trung, and Phu Huu Bui. "FPGA Implementation of Mimo E-SDM for future communications wireless networks." Science and Technology Development Journal 17, no. 1 (March 31, 2014): 81–91. http://dx.doi.org/10.32508/stdj.v17i1.1296.

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Multiple-input multiple-output (MIMO) systems applying the Eigenbeam-Space Division Multiplexing (E-SDM) technique can be considered as optimal MIMO systems because of providing the highest channel capacity and good communications reliability. In the systems, orthogonal transmission beams are formed between transmit and receive sides; and also optimal transmit input data are adaptively allocated. In addition, a simple detection can be used at receiver to totally eliminate sub-stream interference. Therefore, MIMO E-SDM systems have been considered as a good potential technology for future high speed data transmission networks. Although there have been a lot of technical papers evaluated the systems based on theory analyses and/or computer-based simulation, just few ones have been considered the MIMO E-SDM systems based on hardware design. The main contribution of this paper is to present our own design and implementation of 2x2 and 2x3 MIMO E-SDM systems on FPGA Altera Stratix DSP Development KIT using Verilog HDL, an important step before going to make integrated circuits. The bit-error rate performance the consumption for our design of these systems have shown that our design is successful.

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Rappaport, Theodore S., James N. Murdock, and Felix Gutierrez. "State of the Art in 60-GHz Integrated Circuits and Systems for Wireless Communications." Proceedings of the IEEE 99, no. 8 (August 2011): 1390–436. http://dx.doi.org/10.1109/jproc.2011.2143650.

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Thomas, C., M. A. Bickerstaff, L. M. Davis, T. Prokop, B. Widdup, Gongyu Zhou, D. Garrett, and C. Nicol. "Integrated circuits for channel coding in 3G cellular mobile wireless systems." IEEE Communications Magazine 41, no. 8 (August 2003): 150–59. http://dx.doi.org/10.1109/mcom.2003.1222732.

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Moon, Sung Tae, Ari Yakov Valero-López, and Edgar Sánchez-Sinencio. "FULLY INTEGRATED FREQUENCY SYNTHESIZERS: A TUTORIAL." International Journal of High Speed Electronics and Systems 15, no. 02 (June 2005): 353–75. http://dx.doi.org/10.1142/s0129156405003235.

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Frequency synthesizer is a key building block of fully-integrated wireless communications systems. Design of a frequency synthesizer (FS) requires the understanding of not only the circuit-level but also of the transceiver system-level considerations. The FS design challenge involves strong trade-offs, and often conflicting requirements. In this tutorial, the general implementation issues and recent developments of frequency synthesizer design are discussed. Simplified design approach should provide readers with sufficient intuition for fast design and troubleshooting capability. Open problems in this FS field are briefly discussed.

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Esch, Jim. "Prolog to "State of the Art in 60-GHz Integrated Circuits and Systems for Wireless Communications"." Proceedings of the IEEE 99, no. 8 (August 2011): 1386–89. http://dx.doi.org/10.1109/jproc.2011.2155190.

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John Famoriji, Oluwole, Xu Yan, Mehdi Khan, Rao Kashif, Akinwale Fadamiro, Md Sadek Ali, and Fujiang Lin. "Wireless Interconnect in Multilayer Chip-Area-Networks for Future Multimaterial High-Speed Systems Design." Wireless Communications and Mobile Computing 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6083626.

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Wireless chip area network which enables wireless communication among chips fosters development in wireless communication and it is envisioned that future hardware system and developmental functionality will require multimaterial. However, the traditional system architecture is limited by channel bandwidth-limited interfaces, throughput, delay, and power consumption and as a result limits the efficiency and system performance. Wireless interconnect has been proposed to overcome scalability and performance limitations of multihop wired architectures. Characterization and modeling of channel become more important for specification of choice of modulation or demodulation techniques, channel bandwidths, and other mitigation techniques for channel distortion and interference such as equalization. This paper presents an analytical channel model for characterization, modeling, and analysis of wireless chip-to-chip or interchip interconnects in wireless chip area network with a particular focus on large-scale analysis. The proposed model accounts for both static and dynamic channel losses/attenuation in high-speed systems. Simulation and evaluation of the model with experimental data conducted in a computer desktop casing depict that proposed model matched measurement data very closely. The transmission of EM waves via a medium introduces molecular absorption due to various molecules within the material substance. This model is a representative of channel loss profile in wireless chip-area-network communication and good for future electronic circuits and high-speed systems design.

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Lozano, A., and D. C. Cox. "Integrated dynamic channel assignment and power control in TDMA mobile wireless communication systems." IEEE Journal on Selected Areas in Communications 17, no. 11 (1999): 2031–40. http://dx.doi.org/10.1109/49.806831.

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Journal articles on the topic 'Wireless communication systems Wireless communication systems Integrated circuits'

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