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Journal articles on the topic 'Frequency spectrum and efficient transmission'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Ma, Xikai. "A Review of Two Types of New Key Technologies of 6G." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 598–604. http://dx.doi.org/10.54097/hset.v38i.5889.

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The increasing need of future 6G wireless communication of higher transmission rate, larger network capacity, higher energy efficiency has been calling for the development of new key technologies. Among them, the two most popular and promising technologies are new spectrum access technology and efficient wireless transmission technology. New spectrum access technology intends to achieve the utilization of more available spectrum resources with higher frequency and wider bandwidth so that it can highly improve the data transfer rate and expand the network capacity. It includes Terahertz communi

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ABE, Jun-ichi, Fumihiro YAMASHITA, Katsuya NAKAHIRA, and Kiyoshi KOBAYASHI. "Direct Spectrum Division Transmission for Highly Efficient Frequency Utilization in Satellite Communications." IEICE Transactions on Communications E95-B, no. 2 (2012): 563–71. http://dx.doi.org/10.1587/transcom.e95.b.563.

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Yun, Deok-Won, and Won-Cheol Lee. "Intelligent Dynamic Spectrum Resource Management Based on Sensing Data in Space-Time and Frequency Domain." Sensors 21, no. 16 (2021): 5261. http://dx.doi.org/10.3390/s21165261.

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Edge computing offers a promising paradigm for implementing the industrial Internet of things (IIoT) by offloading intensive computing tasks from resource constrained machine type devices to powerful edge servers. However, efficient spectrum resource management is required to meet the quality of service requirements of various applications, taking into account the limited spectrum resources, batteries, and the characteristics of available spectrum fluctuations. Therefore, this study proposes intelligent dynamic spectrum resource management consisting of learning engines that select optimal bac

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Pratt, Thomas G., Jun Chen, and Farzad Talebi. "Towards Efficient Spectrum Utilization with Polarization-Based Architectures." International Journal of Handheld Computing Research 6, no. 2 (2015): 1–19. http://dx.doi.org/10.4018/ijhcr.2015040101.

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Space-polarization MIMO architectures are proposed as a contributing technology to advance efficient spectrum utilization. These architectures have the advantage of leveraging both space and polarization channel correlations, opening the door to diversities and to the effective application of technologies at both the transmit side and the receive side to support spectrum efficiency and sharing. In this paper the authors review some of their work associated with polarization and space-polarization architectures, including channel modeling, sounding and parameter estimation to assist in the deve

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De Cesare, Pablo Nicolas. "Characterization of the ISDB-Tb critical spectrum mask." ACTA IMEKO 1, no. 1 (2012): 42. http://dx.doi.org/10.21014/acta_imeko.v1i1.19.

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Non-linearity in the ISDB-T transmission chain causes intermodulation products that widens the spectrum emission and should be taken into account when assigning frequency channels. The characterization of the transmission spectrum mask is one of the most important measurements in order to achieve the best use of the electromagnetic spectrum. The use of critical mask defined in [1] allows allocations of co-site adjacent channels for an efficient use of the electromagnetic spectrum that is a finite and limited resource. This paper discusses different test procedures using spectrum analyzers and

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Mhatre, Jui, Ahyoung Lee, and Ramazan Aygun. "Frequency-hopping scheduling algorithm for energy-efficient IoT, long-range, wide-area networks." Applied Computing and Intelligence 4, no. 2 (2024): 300–327. https://doi.org/10.3934/aci.2024018.

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<p>A long-range, wide-area network is a cost-effective, energy-efficient technology for wide-area sensor networks. But the massive Internet of Things (IoT) brings challenges such as increased traffic and energy consumption. Thus, there is a pressing need to design a scheduling strategy to improve network energy efficiency without compensating for its reliability. We have proposed a deep deterministic policy gradient-based scheduling algorithm with a frequency-hopping spread spectrum that avoids repeated collisions and retransmissions. Frequency-hopping divides frequency channels into sub

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Mashino, Jun, and Takatoshi Sugiyama. "Spectrum Suppressed Transmission Scheme for Higher Frequency Utilization Efficiency." NTT Technical Review 10, no. 3 (2012): 42–47. http://dx.doi.org/10.53829/ntr201203ra1.

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Dikmese, Sener, Sudharsan Srinivasan, Musbah Shaat, Faouzi Bader, and Markku Renfors. "Spectrum sensing and resource allocation for multicarrier cognitive radio systems under interference and power constraints." EURASIP Journal on Advances in Signal Processing 2014, no. 68 (2014): 1687–6180. https://doi.org/10.5281/zenodo.58002.

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Multicarrier waveforms have been commonly recognized as strong candidates for cognitive radio. In this paper, we study the dynamics of spectrum sensing and spectrum allocation functions in cognitive radio context using very practical signal models for the primary users (PUs), including the effects of power amplifier nonlinearities. We start by sensing the spectrum with energy detection-based wideband multichannel spectrum sensing algorithm and continue by investigating optimal resource allocation methods. Along the way, we examine the effects of spectral regrowth due to the inevitable power am

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9

Lam, Y. M., and P. H. Wittke. "Frequency-hopped spread-spectrum transmission with band-efficient modulations and simplified noncoherent sequence estimation." IEEE Transactions on Communications 38, no. 12 (1990): 2184–96. http://dx.doi.org/10.1109/26.64661.

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Purwandi, Ahmad Wahyu, Abdul Rasyid, and Guntur Wahyu Sejati. "Komunikasi Suara Sinyal Digital Dengan Transmisi Frekuensi 2,4 Ghz." Jurnal Teknologi Informasi dan Terapan 6, no. 2 (2019): 93–102. http://dx.doi.org/10.25047/jtit.v6i2.112.

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The limitations of developing high-tech communication systems cause the area of people who can use this service to be uneven. One technology that can be used for areas not yet reached by this high-tech communication service is to use radio communication technology. Today radio communication technology continues to develop and produce an increasingly limited frequency spectrum. One way to improve the efficient use of available frequency spectrums is the transition from analog technology to digital technology. A very significant benefit in the use of digital technology is to save the use of radi

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Yuminaka, Yasushi, and Yuuki Takada. "Coding Techniques for High-Speed Data Transmission Based on Spectrum Shaping." Key Engineering Materials 596 (December 2013): 204–9. http://dx.doi.org/10.4028/www.scientific.net/kem.596.204.

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The performance of advanced VLSI systems is limited by the interconnection bandwidthinside/between chips rather than individual performance of transistors. The attenuation or deteriorationof signals, arises from physical phenomena in transmission lines, restricts the maximum frequencyat which the signal can transmit. This paper investigates coding techniques that can modifysignal spectrum suited to channel frequency response based on the concept of spectrum shaping ofsignals. We discuss three types of coding techniques for high-speed serial links to evaluate their performanceas well as the fea

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Ouyang, Dahua, Pingzhi Shangguan, Xinyong Huangfu, et al. "Deep Non-Orthogonal Multiple Access Network Assisted by Intelligent Reflecting Surface." ICST Transactions on Mobile Communications and Applications 7, no. 3 (2023): e4. http://dx.doi.org/10.4108/eetmca.v7i3.2750.

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The intelligent reflecting surface (IRS) assisted non-orthogonal multiple access (NOMA) symbiotic communication technology is expected to enhance the access performance, energy efficiency and spectrum efficiency of the communication network, and is regarded as an important candidate technology to support the evolution of the sixth-generation (6G) towards large-scale, high-capacity and sustainable development. However, the relevant research of this technology is still at the initial stage, and many key challenges have not been fully studied. Therefore, it is urgent to open up relevant research

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Danladi, A., and G. Jerome. "DESIGN, CONSTRUCTION AND IMPLEMENTATION OF A 3 METER SATELLITE DISH ANTENNA (PARABOLOID REFLECTORS)." Continental J. Engineering Sciences 3 (July 22, 2008): 37–41. https://doi.org/10.5281/zenodo.833669.

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<em>The objective of this work is to design, construct and implement a 3m diameter paraboloid reflector with a frequency allocation of 3GHZ and above. The design was achieved with the help of wire mesh, aluminum span, mild steel, aluminum foil and glass fiber. The designed model was able to pick up signal from Arabian Satellite CNN, Adamawa Broadcasting television station and other channels with the help of low noise amplification block (LNB)</em>

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Li, Yong, Fuqiang Yao, and Ba Xu. "High Order Differential Frequency Hopping: Design and Analysis." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/586080.

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This paper considers spectrally efficient differential frequency hopping (DFH) system design. Relying on time-frequency diversity over large spectrum and high speed frequency hopping, DFH systems are robust against hostile jamming interference. However, the spectral efficiency of conventional DFH systems is very low due to only using the frequency of each channel. To improve the system capacity, in this paper, we propose an innovative high order differential frequency hopping (HODFH) scheme. Unlike in traditional DFH where the message is carried by the frequency relationship between the adjace

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Locatelli, F., K. Christodoulopoulos, C. Delezoide, et al. "Feedback-Based Channel Frequency Optimization in Superchannels." JOURNAL OF LIGHTWAVE TECHNOLOGY 42, no. 13 (2024): 4467–75. https://doi.org/10.1109/JLT.2024.3372376.

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Making optical networks more efficient and reliable requires further automation of the optical layer. In this context, we propose a closed control loop that automatically performs fine frequency adjustments of the subchannels of superchannels to maintain optimal performance despite time-dependent impairments, thus achieving three main goals. At design, our scheme reduces the need for margins and guard-bands dedicated to spectrum-related impairments such as filter or channel detunings. This allows for a more efficient network at deployment. Then, during operation, the quality of transmission (Q

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Hamedani, Kian, Lingjia Liu, Shiya Liu, Haibo He, and Yang Yi. "Deep Spiking Delayed Feedback Reservoirs and Its Application in Spectrum Sensing of MIMO-OFDM Dynamic Spectrum Sharing." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 02 (2020): 1292–99. http://dx.doi.org/10.1609/aaai.v34i02.5484.

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In this paper, we introduce a deep spiking delayed feedback reservoir (DFR) model to combine DFR with spiking neuros: DFRs are a new type of recurrent neural networks (RNNs) that are able to capture the temporal correlations in time series while spiking neurons are energy-efficient and biologically plausible neurons models. The introduced deep spiking DFR model is energy-efficient and has the capability of analyzing time series signals. The corresponding field programmable gate arrays (FPGA)-based hardware implementation of such deep spiking DFR model is introduced and the underlying energy-ef

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Ma, Yijie, Ziwei Liu, Nan Yang, Huajian Xu, and Gengxin Zhang. "Research on Knowledge Graph Construction and Semantic Representation of Low Earth Orbit Satellite Spectrum Sensing Data." Electronics 13, no. 4 (2024): 672. http://dx.doi.org/10.3390/electronics13040672.

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The growth of frequency-usage devices has made the electromagnetic spectrum posture complex, resulting in an urgent demand for frequency-usage posture cognition. However, the sensing of space-based platforms is limited by the transmission capacity of the satellite-to-ground link and the satellite processing capacity, which makes on-satellite data analysis and posture generation lack the efficient means. Facing the above issues, an idea of a knowledge graph construction and semantic representation for low Earth orbit (LEO) satellite spectrum sensing data is designed in this paper. In the design

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Zheng, Zi Wei. "Iterative Channel Estimation Scheme for the WLAN Systems with the Multiple-Antenna Receivers." Advanced Engineering Forum 6-7 (September 2012): 871–75. http://dx.doi.org/10.4028/www.scientific.net/aef.6-7.871.

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Alleviate the multipath delay spread and suitable for broadband transmission efficiency, orthogonal frequency division multiplexing wireless local area network (WLAN) is widely used to assist inverse fast Fourier transform and fast Fourier transform operation domain. Orthogonal frequency division multiplexing is a blow to the broadcast channel multipath fading and high data throughput, transmission, wireless fading channel method, which is widely used to support high performance bandwidth-efficient wireless multimedia services. Several times in the transmitter and receiver antenna technology a

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19

Zhang, Lingling, Jianguo Huang, Chengkai Tang, and Houbing Song. "Time Reversal Aided Bidirectional OFDM Underwater Cooperative Communication Algorithm with the Same Frequency Transmission." Journal of Sensors 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8242369.

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In underwater acoustic channel, signal transmission may experience significant latency and attenuation that would degrade the performance of underwater communication. The cooperative communication technique can solve it but the spectrum efficiency is lower than traditional underwater communication. So we proposed a time reversal aided bidirectional OFDM underwater cooperative communication algorithm. The algorithm allows all underwater sensor nodes to share the same uplink and downlink frequency simultaneously to improve the spectrum efficiency. Since the same frequency transmission would prod

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Camacho, Miguel, Armando Fernández-Prieto, Rafael R. Boix, and Francisco Medina. "Disorder Effects in One-Dimensionally Periodic Extraordinary Transmission Structures." Electronics 11, no. 18 (2022): 2830. http://dx.doi.org/10.3390/electronics11182830.

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Extraordinary transmission structures show promising capabilities for highly selective filters in both frequency and angle of incidence. However, their realistic response once manufacturing limitations are taken into account remains unexplored. In this manuscript, we explore a novel degree of freedom: disorder. We expand on previously developed highly efficient method of moment (MoM) implementations to study the effects on the transmission properties of large but finite chains of slots due to different families of disorder: lateral and vertical displacements as well as scatterer manipulation (

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Kimani, Kenneth, and Morris Njiraine. "Cognitive Radio Spectrum Sensing Mechanisms in TV White Spaces: A Survey." Engineering, Technology & Applied Science Research 8, no. 6 (2018): 3673–80. https://doi.org/10.5281/zenodo.2532696.

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Frequency spectrum is a limited resource and the increasing demand caused by emerging services, augmented number of wireless users along with the demand for high-quality multimedia applications have resulted in the overcrowding of the allocated spectrum bands. The overcrowding of spectrum bands has been exacerbated by the current spectrum licensing policy which has emerged as a bottleneck to efficient spectrum utilization, due to its inflexibility, resulting in most of the licensed spectrum being severely under-utilized. However, the problem of scarcity of spectrum bands and the inefficient ut

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Suddhendu, DasMahapatra, Gandhi Ishita, Nair Kartik, and Nath Sharan Shivendra. "Sensing schedule optimization to minimize interference with primary users in cognitive radio network." Indonesian Journal of Electrical Engineering and Computer Science (IJEECS) 17, no. 3 (2020): 1399–404. https://doi.org/10.11591/ijeecs.v17.i3.pp1399-1404.

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Radio Frequency (RF) spectrum, which is a limited resource, is facing the challenge of fulfilling the need of ever-growing users. To accommodate these users in an efficient manner, the idea of Cognitive Radio (CR) was proposed. It allows unlicensed users to use the licensed bands when the primary user is not using its band. To check the availability of the free spectrum, the system should be able to sense the RF environment around it, thus spectrum sensing becomes an important aspect of CR. In this work, the Genetic Algorithm (GA) is used to determine the periodic sensing schedule to maximize

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S.Sankar Ganesh. "Dynamic Neural Network-Based Resource Allocation Framework for Latency-Aware and Energy-Efficient Optimization in Wireless Communication Systems." Journal of Electrical Systems 20, no. 5s (2024): 2016–24. http://dx.doi.org/10.52783/jes.2538.

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In wireless communication, efficiency is a crucial factor due to the inherent constraints of the radio frequency spectrum and the escalating demand for connectivity. With a limited spectrum available, efficient communication protocols are vital to maximize its utilization and accommodate the increasing number of devices. This study introduces a dynamic resource allocation system for wireless communication, encompassing essential components such as Base Stations (BS), Mobile Devices (MD), and a Centralized Controller (CC). BSs, serving as access points, establish wireless communication with MD

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El-Absi, Mohammed, Musbah Shaat, Carlos Faouzi Bader, and Thomas Kaiser. "Interference Alignment with Frequency-Clustering for Efficient Resource Allocation in Cognitive Radio Networks." IEEE Transactions on Wireless Communications 14, no. 12 (2015): 7070–82. https://doi.org/10.5281/zenodo.46559.

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In this paper, we investigate the resource management problem in orthogonal frequency division multiplexing (OFDM) based multiple-input multiple-output (MIMO) cognitive radio (CR) systems. We propose performing resource allocation based on interference alignment (IA) in order to improve the spectral efficiency of CR systems without affecting the quality of service of the primary system. IA plays a role in the proposed algorithm to enable the secondary users (SUs) to cooperate and share the available spectrum, which leads to a considerable increase in the spectral efficiency of CR systems. Howe

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Jerry, Raymond Adekogba Opeyemi Olajumoke Maxwell Francisc Aliyu Danjuma Usman. "A Review of Spectrum Sensing Times in Cognitive Radio Networks." Advances in Engineering Design Technology 5, no. 1 (2023): 29–42. https://doi.org/10.5281/zenodo.7781932.

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<em>The introduction of Cognitive Radio (CR) to ensure the efficient utilization of radio spectrum resources, where the opportunistic unlicensed user called the Secondary User (SU) jumped into a temporary unused spectrum owned by the licensed user called the Primary User (PU) for data transmission without causing interference. The CR is the key enabling technology that enables next generation communication system also known as Dynamic Spectrum Access (DSA) networks to efficiently utilize Radio Frequency (RF) spectrum effectively. The CR has opened more research areas among which is the Spectru

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Gimenez, Jordi Joan, David Gomez-Barquero, Javier Morgade, and Erik Stare. "Wideband Broadcasting: A Power-Efficient Approach to 5G Broadcasting." IEEE Communications Magazine 56, no. 3 (2018): 119–25. https://doi.org/10.1109/MCOM.2018.1700675.

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Efficient and flexible use of spectrum will be inherent characteristics of 5G communication technologies with native support of wideband operation with frequency reuse 1 (i.e., all transmit sites use all available frequency resources). Although not in the very first 5G release of 3GPP, it is expected that broadcast/multicast technology components will later be added and fully integrated in the 5G system. The combination of both wideband and frequency reuse 1 may provide significant gains for broadcast transmissions in terms of energy efficiency, since it is more efficient to increase capacity

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Xu, Hui, Chaorong Zhang, Qingying Wu, Benjamin K. Ng, and Chan-Tong Lam. "Adaptive Damping Log-Domain Message-Passing Algorithm for FTN-OTFS in V2X Communications." Sensors 25, no. 12 (2025): 3692. https://doi.org/10.3390/s25123692.

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To enable highly reliable and spectrum-efficient vehicle-to-everything (V2X) communications under conditions with severe Doppler effects and rapidly time-varying channels, we propose a novel faster-than-Nyquist orthogonal time frequency space (FTN-OTFS) modulation scheme. In this scheme, FTN signaling is integrated with spectrally efficient frequency division multiplexing (SEFDM) within the OTFS framework, enabling a higher symbol-transmission density within a fixed time–frequency resource block and thus enhancing spectral efficiency without increasing the occupied bandwidth. An analytical inp

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Kumar, Arun, Anish Pon Yamini, Nishant Gaur, and Aziz Nanthaamornphong. "A mathematical analysis of the PAPR in the NOMA waveform using SLM algorithm for 64-QAM." Journal of Interdisciplinary Mathematics 27, no. 2 (2024): 223–32. http://dx.doi.org/10.47974/jim-1815.

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In Non-Orthogonal Multiple Access (NOMA) technology, a paradigm shift in wireless communication is observed, as it allows numerous users to simultaneously transmit data over the same spectral resources in a non-orthogonal manner. Despite the advancements it brings to the table, NOMA is faced with a notable technical obstacle, that being the elevated Peak-to-Average Power Ratio (PAPR). Elevated PAPR levels can lead to less efficient use of power and a deterioration in the fidelity of the signal. We proposed a Selective Mapping (SLM) as a powerful solution to address this issue. SLM is a PAPR re

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Rupesh Mahajan. "Information Theory and Coding Techniques for 5G Wireless Communication Systems: Towards Efficient Spectrum Utilization." Panamerican Mathematical Journal 34, no. 1 (2024): 66–80. http://dx.doi.org/10.52783/pmj.v34.i1.907.

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The introduction of 5G wireless communication networks has initiated a new period of connectivity, offering extremely high data rates, minimal delay, and extensive device compatibility. However, in order to fully use the capabilities of 5G, it is crucial to prioritize the effective exploitation of spectrum. Efficiency in data transmission is achieved by the optimization of data transmission, error minimization, and maximization of throughput, which are facilitated by information theory and coding techniques. This work examines the convergence of information theory and coding methods in the con

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Shi, Yan Li, Lin Ren, Hai Xia Yu, and Yang Song. "SNR Estimation of OFDM Adaptive System in Gauss Channel." Advanced Materials Research 760-762 (September 2013): 325–28. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.325.

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The technology of OFDM is a multi-carrier technology, and it is a kind of high efficient modulation technique, it has the ability of strong anti multi-path propagation and frequency selective fading, and higher frequency spectrum utilization rate, this technology is applicable to high speed data transmission in the multi-path and fading channel environment. This paper introduces the basic principle of OFDM adaptive system, and the SNR estimation of OFDM adaptive system in Gauss channel through the simulation, this is a theoretical foundation to practical application in the future.

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Lysechko, Volodymyr, Oleksii Komar, Olena Syvolovska, and Oleksandr Veklych. "Analysis of Wireless Communication Protocols for Enhancing the Efficiency of Cognitive Telecommunications Networks Functionality." Security of Infocommunication Systems and Internet of Things 2, no. 1 (2024): 01005. http://dx.doi.org/10.31861/sisiot2024.1.01005.

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In the study, modern protocols and their specifications were analyzed and systematized. Advantages and disadvantages were identified, which are necessary for expanding the application possibilities of cognitive radio systems. Through the analysis of the technical characteristics of cognitive radio systems, the main factors of stagnation in various technological capabilities were discovered. It has been proven that IEEE protocols provide a critically important foundation for the standardization of cognitive radio systems, facilitating their compatibility and efficient use of the radio frequency

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Migabo, Emmanuel, Karim Djouani, and Anish Kurien. "A Novel Spread Spectrum and Clustering Mixed Approach with Network Coding for Enhanced Narrowband IoT (NB-IoT) Scalability." Sensors 20, no. 18 (2020): 5219. http://dx.doi.org/10.3390/s20185219.

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The Narrowband Internet of Things (NB-IoT) is a very promising licensed Internet of things (IoT) technology for accommodating massive device connections in 5G and beyond. To enable network scalability, this study proposes a two-layers novel mixed approach that aims not only to create an efficient spectrum sharing among the many NB-IoT devices but also provides an energy-efficient network. On one layer, the approach uses an Adaptive Frequency Hopping Spread Spectrum (AFHSS) technique that uses a lightweight and secure pseudo-random sequence to exploit the channel diversity, to mitigate inter-li

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Patil, Ameykumar Arunrao. "Robust Transmission using Efficient Adaptive Modulation and Coding in Modern OFDM Systems." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (2023): 3364–76. http://dx.doi.org/10.22214/ijraset.2023.52336.

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Abstract: OFDM (Orthogonal Frequency Division Multiplexing) as a special multi-carrier transmission technology has good resistance to narrow-band interference and frequency selective fading ability. Using adaptive modulation and coding in an OFDM systems in comparison with traditional fixed modulation techniques, it becomes possible to take full advantage of spectrum resources enhancing bandwidth efficiency and system capacity making it suitable for the high-speed and reliable mobile communication systems in the future. In AMC (Adaptive Modulation and Coding) technique, modulation method, codi

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DasMahapatra, Suddhendu, Ishita Gandhi, Kartik Nair, and Shivendra Nath Sharan. "Sensing schedule optimization to minimize interference with primary users in cognitive radio network." Indonesian Journal of Electrical Engineering and Computer Science 17, no. 3 (2020): 1399. http://dx.doi.org/10.11591/ijeecs.v17.i3.pp1399-1404.

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<p class="Abstract">Radio Frequency (RF) spectrum, which is a limited resource, is facing the challenge of fulfilling the need of ever-growing users. To accommodate these users in an efficient manner, the idea of Cognitive Radio (CR) was proposed. It allows unlicensed users to use the licensed bands when the primary user is not using its band. To check the availability of the free spectrum, the system should be able to sense the RF environment around it, thus spectrum sensing becomes an important aspect of CR. In this work, the Genetic Algorithm (GA) is used to determine the periodic sen

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Zhang, Lili, Wenxin Zhu, and Lichi Zhang. "Study of Load-based Energy Saving for Multi-layer Networks on Base Station." Journal of Physics: Conference Series 2861, no. 1 (2024): 012003. http://dx.doi.org/10.1088/1742-6596/2861/1/012003.

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Abstract With the rapid deployment and widespread popularization of 5G technology, mobile networks have achieved wider frequency spectrum, more efficient data transmission, and larger capacity, providing users with unprecedented experiences. However, the multi-band technology applied by large urban base stations to meet the demand for high-speed internet experience has also led to a significant increase in energy consumption. It also receives a growing number of attentions from engineers and researchers, due to the increasing awareness of energy consumption issues. This paper proposes load-bas

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Gong, Baogui, Xingwu Zhang, and Xuefeng Chen. "Application of multiple spectrum domain fault probability fusion model in high-speed rail bearings." Journal of Physics: Conference Series 2862, no. 1 (2024): 012035. http://dx.doi.org/10.1088/1742-6596/2862/1/012035.

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Abstract High-speed railway bearings are one of the core transmission components of high-speed railway multiple units, and their degraded performance can directly affect the safety performance of vehicles. How to identify faults in high-speed rail bearings and represent them in data has always been an industry challenge. To this end, multiple frequency domain fault probability fusion models have been proposed for research. The first choice for this model is to provide an analysis method for converting the frequency domain spectrum to fault probability. Subsequently, five frequency domain spect

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Rishabh, Yadav *. Sachin Tyagi. "SPECTRUM SENSING WITH ENERGY DETECTION TECHNIQUES FOR COGNITIVE RADIO SYSTEM." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 7 (2016): 1078–84. https://doi.org/10.5281/zenodo.57992.

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A cognitive radio by virtue of its ability to sense and adapt to the dynamic spectrum scenario, can increase the spectral efficiency .In order to be non invasive, a cognitive radio must adhere to strict benchmark in the quality of spectrum sensing for primary users of a band.Thus, spectrum sensing has a major role to play in cognitive radio .Many algorithms have been proposed to enable spectrum sensing such as energy detection and cyclostationary detection. IEEE 802.22, the first standard for cognitive radio devices, imposes strict requirements for the detection and false alarm probability on

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Nwajana, Augustine O., and Emenike Raymond Obi. "A Review on SIW and Its Applications to Microwave Components." Electronics 11, no. 7 (2022): 1160. http://dx.doi.org/10.3390/electronics11071160.

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Substrate-integrated waveguide (SIW) is a modern day (21st century) transmission line that has recently been developed. This technology has introduced new possibilities to the design of efficient circuits and components operating in the radio frequency (RF) and microwave frequency spectrum. Microstrip components are very good for low frequency applications but are ineffective at extreme frequencies, and involve rigorous fabrication concessions in the implementation of RF, microwave, and millimeter-wave components. This is due to wavelengths being short at higher frequencies. Waveguide devices,

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Aboltins, Arturs, and Nikolajs Tihomorskis. "Software-Defined Radio Implementation and Performance Evaluation of Frequency-Modulated Antipodal Chaos Shift Keying Communication System." Electronics 12, no. 5 (2023): 1240. http://dx.doi.org/10.3390/electronics12051240.

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This paper is devoted to software-defined radio (SDR) implementation of frequency modulated antipodal chaos shift keying (FM-ACSK) transceiver and presents results of prototype testing in real conditions. This novel and perspective class of spread-spectrum communication systems employs chaotic synchronization for the acquisition and tracking of the analog chaotic spreading code and does not need resource-demanding cross-correlation. The main motivation of the given work is to assess the performance of FM-ACSK in real conditions and demonstrate that chaotic synchronization can be considered an

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Kimani, K., and M. Njiraine. "Cognitive Radio Spectrum Sensing Mechanisms in TV White Spaces: A Survey." Engineering, Technology & Applied Science Research 8, no. 6 (2018): 3673–80. http://dx.doi.org/10.48084/etasr.2442.

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Frequency spectrum is a limited resource and the increasing demand caused by emerging services, augmented number of wireless users along with the demand for high-quality multimedia applications have resulted in the overcrowding of the allocated spectrum bands. The overcrowding of spectrum bands has exacerbated by the current spectrum licensing policy which has emerged as a bottleneck to efficient spectrum utilization, due to its inflexibility, resulting in most of the licensed spectrum being severely under-utilized. However, the problem of scarcity of spectrum bands and the inefficient utiliza

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Lai, Jinxiang, Deqing Wang, and Yifeng Zhao. "IMSBA: A Novel Integrated Sensing and Communication Beam Allocation Based on Multi-Agent Reinforcement Learning for mmWave Internet of Vehicles." Applied Sciences 15, no. 11 (2025): 6069. https://doi.org/10.3390/app15116069.

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In a multi-beam communication scenario where Infrastructure-to-Vehicle (I2V) and Vehicle-to-Vehicle (V2V) communications coexist, the limited spectrum of resources force V2V users to reuse the orthogonal frequency bands allocated to I2V, inevitably introducing cross-layer interference between I2V and V2V. Furthermore, the adoption of a multi-beam communication architecture exacerbates beam interference, significantly degrading the overall network’s communication and sensing performance. To address these challenges, this paper proposes an integrated sensing and communication (ISAC) beam allocat

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Pallavi, C. H., and G. Sreenivasulu. "A High Speed Underwater Wireless Communication Through a Novel Hybrid Opto-Acoustic Modem Using MIMO-OFDM." Instrumentation Mesure Métrologie 20, no. 5 (2021): 279–87. http://dx.doi.org/10.18280/i2m.200505.

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For efficient underwater opto/acoustic communication, this research proposes the use of MIMO in conjunction with OFDM. OFDM (Orthogonal Frequency-Division Multiplexing) and MIMO (Multiple Input Multiple Output) systems may be widely used in wireless networks to provide high data transfer rates, resistance to multipath fading, and an increase in the channel's Spatial Multiplexing and Spatial Diversity Gain. Transmission speed can be increased by altering bandwidth or spectral efficiency (or both) in wireless data transmission systems. Systems that use Multi-Input Multi-Output (MIMO) technologie

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Li, Kaixuan, Tao Yang, Xue Wang, Sheping Shi, Liqian Wang, and Xue Chen. "Frequency-Shift Monitoring of Optical Filter Based on Optical Labels over FTN-WDM Transmission Systems." Photonics 10, no. 10 (2023): 1166. http://dx.doi.org/10.3390/photonics10101166.

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Optical network monitoring and soft failure identification such as optical filter shifting and filter tightening are increasingly significant for the complex and dynamic optical networks of the future. Center frequency shift of optical filtering devices in optical networks has a serious impact on the performance of multi-span transmission, especially in high spectrum efficiency faster-than-Nyquist (FTN) transmission systems with various optical switching and add/drop nodes. Existing monitoring schemes generally have the problems of high cost, high complexity, and inability to realize multi-cha

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Baturin, A. S., V. V. Hvorenkov, and K. V. Shishakov. "Modern Solutions to Improve the Energy Efficiency of Radio Lines for the Technical Renewal of Radio Stations of Integrated Communication Systems." Vestnik IzhGTU imeni M.T. Kalashnikova 25, no. 4 (2022): 47–62. http://dx.doi.org/10.22213/2413-1172-2022-4-47-62.

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Promising tasks for improving radio equipment with increased energy efficiency, related to in-depth preliminary study and efficiency research using the stand of the chief designer, are considered. Initially, a theoretical factor analysis of the interference radio terminal energy efficiency with respect to evenly distributed over the spectrum is given. The problem of choosing a variant of digital modulation and parameters of a noise-resistant code from the condition of obtaining the least energy for the transmission of one bit of information at a given error probability per bit and the level of

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Fan, Yuxiang. "Performance Analysis of NOMA Transmission Systems Based on OTFS." Journal of Physics: Conference Series 2447, no. 1 (2023): 012009. http://dx.doi.org/10.1088/1742-6596/2447/1/012009.

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Abstract Orthogonal time frequency space (OTFS) and non-orthogonal multiple-access (NOMA) are both wireless transmission technologies suitable for high-speed scenarios. This paper proposes a cross-domain transmission scheme combining OTFS and NOMA applicable to the Internet of vehicles. We establish a channel model of cross-domain transmission. Based on the downlink, we deduce the expression for the SINR of the transmitted signal. We simulate and analyze the spectrum efficiency and other performance from the perspective of the system level. At last, we make a comparison between the OTFS-based

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Garlinska, Magdalena, Agnieszka Pregowska, Karol Masztalerz, and Magdalena Osial. "From Mirrors to Free-Space Optical Communication—Historical Aspects in Data Transmission." Future Internet 12, no. 11 (2020): 179. http://dx.doi.org/10.3390/fi12110179.

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Fast communication is of high importance. Recently, increased data demand and crowded radio frequency spectrum have become crucial issues. Free-Space Optical Communication (FSOC) has diametrically changed the way people exchange information. As an alternative to wire communication systems, it allows efficient voice, video, and data transmission using a medium like air. Due to its large bandwidth, FSOC can be used in various applications and has therefore become an important part of our everyday life. The main advantages of FSOC are a high speed, cost savings, compact structures, low power, ene

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Chiti, Francesco, Romano Fantacci, Benedetta Picano, and Laura Pierucci. "A Capacitated House Allocation Game for the Energy Efficient Relays Selection in 5G Multicast Context." Sensors 20, no. 18 (2020): 5347. http://dx.doi.org/10.3390/s20185347.

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The upcoming fifth generation (5G) wireless networks making use of higher-frequency spectrum bands suffer from serious propagation issues due to high path loss and beam directivity requirements. This promotes the device-to-device communications to boost the transmission reliability at the network edges, providing remarkable benefits in terms of the energy and spectrum efficiency, essential for a wide class of sensors networks and Internet-of-Things. More in general, applications where devices are usually constrained in computational and transmission range capabilities. In such a context, the s

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Mohandass, S., G. Umamaheswari, and H. Kowsika. "Wireless Image Transmission Based on Cognitive Radio for Robotic Communication." Advanced Materials Research 984-985 (July 2014): 1370–74. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.1370.

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Wireless communication plays a vital role in robotic communication. The robots can communicate using any of the wireless standards like Bluetooth, Zigbee, Wi-fi, etc. based on the application. Many applications involve wireless transmission of images from the robots to the access point. The images can be transmitted at a particular frequency based on the wireless standard. However, interference is a major issue in wireless communication. In order to overcome interference and to make use of white space spectrum, cognitive radio is used. Hence in this paper, wireless image transmission based on

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Rim, Minjoong, and Eulhyeon Go. "Relay Positions Considering Interference from Other Sub-Channels in OFDMA-Based D2D Group-Casting Systems." Sensors 19, no. 6 (2019): 1374. http://dx.doi.org/10.3390/s19061374.

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Device-to-device (D2D) communication is a technique for direct communication between devices without going through a base station or other infrastructure. D2D communication technology has the advantages of improving spectrum efficiency and reducing transmission delay and transmission power. In D2D communication systems, orthogonal frequency-division multiple access (OFDMA) is widely used to maintain similarities with cellular communication systems and to secure transmission distance. OFDMA allows flexible and efficient use of frequency resources by allocating sub-channels independent to each u

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Fraimis, Ioannis G., and Stavros A. Kotsopoulos. "A Low-Complexity Resource Allocation Algorithm for MIMO-OFDMA Multicast Systems with Spectrum-Guarantee Provisioning." International Journal of Digital Multimedia Broadcasting 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/585267.

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We study the important problem of resource allocation for the downlink of Multiple-Input Multiple output (MIMO) Multicast Wireless Systems operating over frequency-selective channels and we propose a low-complexity but efficient resource allocation algorithm for MIMO-enabled OFDMA systems. The proposed solution guarantees a minimum spectrum share for each user while also takes advantage of the multicast transmission mode. The presence of multiple antennas in both transmitter and receiver offers spatial diversity to the system along with the frequency diversity added by the OFDMA access scheme.

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