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Journal articles on the topic 'Ultra-wideband antennas Orthogonal frequency division multiplexing'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

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 allows data transfer rate and spectrum efficiency and the use of multiple transmit antennas and multiple receive antennas through spatial processing. High-precision channel estimation scheme is very important wideband multi-carrier orthogonal frequency complex WLAN systems use multiple antenna receiver based division of labor and the overall multi-carrier orthogonal frequency multiplexing division of performance-based WLAN system is to crucial antenna to receive the symbol error rate. In this article, the iterative channel estimation scheme proposed multi-carrier orthogonal frequency division multiplexed using multiple antennas receiver-based WLAN system.

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2

Karim. "Orthogonal Frequency Division Multiplexing Timing Synchronization in Multi-Band Orthogonal Frequency Division Multiplexing Ultra-Wideband Systems." American Journal of Applied Sciences 7, no. 3 (2010): 420–27. http://dx.doi.org/10.3844/ajassp.2010.420.427.

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3

Garmatyuk, Dmitriy, Brian Jameson, Robert Cole, Yu Tong Morton, and Saba Mudaliar. "Target scene frequency diversity exploitation with ultra‐wideband orthogonal frequency division multiplexing radar." IET Radar, Sonar & Navigation 8, no. 9 (2014): 1247–54. http://dx.doi.org/10.1049/iet-rsn.2014.0024.

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4

He, Jing, Xuejie Wen, Ming Chen, Lin Chen, and Jinshu Su. "Full-duplex multiband orthogonal frequency division multiplexing ultra-wideband over fiber system." Optical Engineering 54, no. 1 (2015): 016101. http://dx.doi.org/10.1117/1.oe.54.1.016101.

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5

Jung, S. Y., and D. J. Park. "Precoded orthogonal frequency division multiplexing with hidden pilots for ultra-wideband wireless communications." IET Communications 2, no. 7 (2008): 938. http://dx.doi.org/10.1049/iet-com:20070537.

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6

Dyadyuk, Val, Xiaojing Huang, Leigh Stokes, and Joseph Pathikulangara. "Implementation of wideband digital beam forming in the E-band." International Journal of Microwave and Wireless Technologies 3, no. 3 (2011): 259–66. http://dx.doi.org/10.1017/s1759078711000468.

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This paper reports the test results of a small-scale prototype that implements a digitally beam-formed phased antenna array in the E-band. A four-channel dual-conversion receive RF module for 71–76 GHz frequency band has been developed and integrated with a linear end-fire antenna array. Wideband frequency-domain angle-of-arrival estimation and beam-forming algorithms were developed and implemented using Orthogonal Frequency Division Multiplexing (OFDM) with Quadrature Phase-Shift Keying (QPSK) at 1 Gbps. Measured performance is very close to the simulated results and experimental data for an analogue-beam-formed array. This work is a stepping stone toward practical realization of larger hybrid arrays in the E-band.

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7

WANG, Gao-bin, and She-xiang MA. "Compressive sensing for ultra-wideband signals based on multi-band orthogonal frequency division multiplexing." Journal of Computer Applications 32, no. 6 (2013): 1820–22. http://dx.doi.org/10.3724/sp.j.1087.2012.01820.

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8

YANG, QINGHAI, HUAMIN ZHU, and KYUNG SUP KWAK. "SUPERIMPOSED TRAINING-BASED CHANNEL ESTIMATION FOR MIMO-MB-OFDM UWB SYSTEMS." Journal of Circuits, Systems and Computers 17, no. 05 (2008): 865–70. http://dx.doi.org/10.1142/s0218126608004721.

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A novel channel estimation scheme based on superimposed training is proposed for multiple-input multiple-output multi-band orthogonal frequency division multiplexing ultra-wideband systems. The optimal training symbols are derived with respect to the least-square channel estimate mean square error. Simulation shows that the proposed scheme benefits much higher effective data throughput over the conventional method.

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9

Guo, Y. X., M. L. Yee, L. C. Ong, and V. H. Pham. "Performance evaluation of multiband orthogonal frequency division multiplexing ultra-wideband signal transmission over multimode fibre." IET Optoelectronics 4, no. 3 (2010): 113–20. http://dx.doi.org/10.1049/iet-opt.2008.0061.

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10

Guo, Yong. "Wavelet packet transform-based time of arrival estimation method for orthogonal frequency division multiplexing ultra-wideband signal." IET Science, Measurement & Technology 9, no. 3 (2015): 344–50. http://dx.doi.org/10.1049/iet-smt.2013.0226.

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11

Sen, Debarati, Saswat Chakrabarti, and R. V. Raja Kumar. "An Adaptive Timing Synchronization Scheme for Multi-Band Orthogonal Frequency Division Multiplexing Based Ultra-Wideband Communication Systems." Wireless Personal Communications 53, no. 2 (2009): 281–98. http://dx.doi.org/10.1007/s11277-009-9684-5.

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12

Bhaskar, Vidhyacharan, and Panneerselvam Anita Devi. "Performance of multiband orthogonal frequency division multiplexing network in ultra wideband channels incorporating people shadowing and channel fading." IET Communications 7, no. 15 (2013): 1665–75. http://dx.doi.org/10.1049/iet-com.2012.0808.

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13

Ouyang, Yuan, Wen-Piao Lin, and Chuan-Chih Liu. "Performance Analysis of the Multiband Orthogonal Frequency Division Multiplexing Ultra-Wideband Systems for Multipath Fading and Multiuser Interference Channels." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/190809.

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This paper presents the performance analysis of the multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) systems for multipath fading and multiuser interference channels. A closed form approximation of the BER performance of the MB-OFDM UWB system with multiple interferences is proposed. Based on the derived approximation, the effects on the BER performance for the choice of the codeword constraint lengths of the convolutional encoder, the length of the cyclic prefix, and the multiuser environments of two or more interferers are thoroughly discussed. Four UWB multipath fading channels are also investigated for the BER performance of the MB-OFDM UWB system. The simulated results provide us with useful information to appropriately choose the parameters of the MB-OFDM UWB system for the sake of achieving the BER performance that conforms to requirement of the FCC standards.

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14

Pola, Marek, and Pavel Bezoušek. "Pseudorange error analysis for precise indoor positioning system." Journal of Electrical Engineering 68, no. 3 (2017): 206–11. http://dx.doi.org/10.1515/jee-2017-0030.

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Abstract There is a currently developed system of a transmitter indoor localization intended for fire fighters or members of rescue corps. In this system the transmitter of an ultra-wideband orthogonal frequency-division multiplexing signal position is determined by the time difference of arrival method. The position measurement accuracy highly depends on the directpath signal time of arrival estimation accuracy which is degraded by severe multipath in complicated environments such as buildings. The aim of this article is to assess errors in the direct-path signal time of arrival determination caused by multipath signal propagation and noise. Two methods of the direct-path signal time of arrival estimation are compared here: the cross correlation method and the spectral estimation method.

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15

Louliej, Abdelhamid, Younes Jabrane, Víctor P. Gil Jiménez, and Frédéric Guilloud. "Dimensioning an FPGA for Real-Time Implementation of State of the Art Neural Network-Based HPA Predistorter." Electronics 10, no. 13 (2021): 1538. http://dx.doi.org/10.3390/electronics10131538.

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Orthogonal Frequency Division Multiplexing (OFDM) is one of the key modulations for current and novel broadband communications standards. For example, Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) is an excellent choice for the ECMA-368 Ultra Wideband (UWB) wireless communication standard. Nevertheless, the high Peak to Average Power Ratio (PAPR) of MB-OFDM UWB signals reduces the power efficiency of the key element in mobile devices, the High Power Amplifier (HPA), due to non-linear distortion, known as the non-linear saturation of the HPA. In order to deal with this limiting problem, a new and efficient pre-distorter scheme using a Neural Networks (NN) is proposed and also implemented on Field Programmable Gate Array (FPGA). This solution based on the pre-distortion concept of HPA non-linearities offers a good trade-off between complexity and performance. Some tests and validation have been conducted on the two types of HPA: Travelling Wave Tube Amplifiers (TWTA) and Solid State Power Amplifiers (SSPA). The results show that the proposed pre-distorter design presents low complexity and low error rate. Indeed, the implemented architecture uses 10% of DSP (Digital Signal Processing) blocks and 1% of LUTs (Look up Table) in case of SSPA, whereas it only uses 1% of LUTs in case of TWTA. In addition, it allows us to conclude that advanced machine learning techniques can be efficiently implemented in hardware with the adequate design.

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16

Hraimel, Bouchaib, Xiupu Zhang, and Ke Wu. "Photonic Down-Conversion of Millimeter Wave Multiband Orthogonal Frequency Division Multiplexing Ultra-Wideband Using Four Wave Mixing in an Electro-Absorption Modulator." Journal of Lightwave Technology 28, no. 13 (2010): 1987–93. http://dx.doi.org/10.1109/jlt.2010.2051140.

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17

Ragheb, Ahmed, Ghazal Fahmy, Iman Ashour, and Abdel Hady Ammar. "A Novel Reconfigurable MB-OFDM UWB LNA Using Programmable Current Reuse." International Journal of Microwave Science and Technology 2013 (March 25, 2013): 1–5. http://dx.doi.org/10.1155/2013/924161.

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This paper presents a design of a reconfigurable low noise amplifier (LNA) for multiband orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) receivers. The proposed design is divided into three stages; the first one is a common gate (CG) topology to provide the input matching over a wideband. The second stage is a programmable circuit to control the mode of operation. The third stage is a current reuse topology to improve the gain, flatness and consume lower power. The proposed LNA is designed using 0.18 μm CMOS technology. This LNA has been designed to operate in two subbands of MB-OFDM UWB, UWB mode-1 and mode-3, as a single or concurrent mode. The simulation results exhibit the power gain up to 17.35, 18, and 11 dB for mode-1, mode-3, and concurrent mode, respectively. The NF is 3.5, 3.9, and 6.5 and the input return loss is better than −12, −13.57, and −11 dB over mode-1, mode-3, and concurrent mode, respectively. This design consumes 4 mW supplied from 1.2 V.

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18

Brendel, Friederike, Julien Poëtte, Béatrice Cabon, and Frédéric van Dijk. "Low-cost analog fiber optic links for in-house distribution of millimeter-wave signals." International Journal of Microwave and Wireless Technologies 3, no. 2 (2011): 231–36. http://dx.doi.org/10.1017/s1759078711000031.

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In this article, analog fiber optic links (radio-over-fiber, RoF, links) are presented as a flexible, low-cost solution for in-house distribution of millimeter-wave (mmw) signals. Mode-locked laser diodes (MLLD) serve as inexpensive mmw sources for the downlink distribution of mmw signals across an optical fiber link. We compare the robustness of direct and external RF modulation for such MLLD-based RoF systems, whereas the error vector magnitude (EVM) of the received symbols serves as a figure of merit. On the eve of 60 GHz WLAN standardization, we experimentally investigate the transmission of narrowband WLAN (IEEE 802.11a) signals in the millimetric range at moderate data rates. We also demonstrate broadband transmission of multi-band orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) european computer manufacturers association (ECMA 368) signals in the 60 GHz band for data rates of up to 480 Mbps.

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19

Benhamid, Mahmud, and Masuri Bin Othman. "Hardware Implementation of a Genetic Algorithm Based Canonical Singed Digit Multiplierless Fast Fourier Transform Processor for Multiband Orthogonal Frequency Division Multiplexing Ultra Wideband Applications." Journal of Mathematics and Statistics 5, no. 4 (2009): 241–50. http://dx.doi.org/10.3844/jmssp.2009.241.250.

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20

Jun, Liu, Luo Zhongqiang, and Xiong Xingzhong. "Low-Complexity Synchronization Scheme with Low-Resolution ADCs." Information 9, no. 12 (2018): 313. http://dx.doi.org/10.3390/info9120313.

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An important function of next-generation (5G) and beyond mobile communication systems is aim to provide thousand-fold capacity growth and to support high-speed data transmission up to several megabits per second. However, the research community and industries have to face a dilemma of power consumption and hardware design to satisfy the increasing communication requirements. For the purpose of improving the system cost, power consumption, and implementation complexity, a novel scheme of symbol timing and frequency offset estimation with low-resolution analog-to-digital converters (ADCs) based on an orthogonal frequency division multiplexing ultra-wideband (OFDM-UWB) system is proposed in this paper. In our work, we first verified the principle that the autocorrelation of the pseudo-noise (PN) sequences was not affected by low-resolution quantization. With the help of this property, the timing synchronization could be strongly implemented against the influence of low-resolution quantization. Then, the transmitted signal structure and low-resolution quantization scheme under the synchronization scheme were designed. Finally, a frequency offset estimation model with one-bit timing synchronization was established. Theoretical analysis and simulation results corroborate that the performance of the proposed scheme not only approximates to that of the full-resolution synchronization scheme, but also has lower power consumption and computational complexity.

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21

QUINTANILLA, L., J. ARIAS, J. SEGUNDO, L. ENRIQUEZ, J. M. HERNANDEZ-MANGAS та J. VICENTE. "EFFECT OF FINITE AMPLIFIER BANDWIDTH AND EXCESS LOOP DELAY IN A PARALLEL CT ΔΣ ADC FOR OFDM UWB RECEIVERS". Journal of Circuits, Systems and Computers 22, № 04 (2013): 1350024. http://dx.doi.org/10.1142/s0218126613500242.

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A comprehensive analysis of the impact of the finite gain-bandwidth product (GBW) in amplifiers and the excess loop delay on a parallel multibit CT ΔΣ ADC for an orthogonal frequency division multiplexing OFDM ultra-wideband (UWB) receiver has been carried out in this paper. The overall converter consists of two CT ΔΣ modulators covering two sub-bands (each of them implemented by a third and a fourth order CT ΔΣ modulator) that are arranged to operate in parallel. Our study was based on the dependence of the noise transfer function (NTF) poles and zeroes locus in the z-plane on these two nonideal effects for both modulators from a theoretical approach. The corresponding STFs were also analytically evaluated. System-level simulations have been accomplished too. Amplifiers were modeled according to a single-pole transfer function. Using the modified Z-transform method the dependence of the NTF poles and zeroes locus in the z-plane on the finite GBW and on excess loop delay was obtained when the DAC pulse end occurs in the current ("early") or in the following ("late") clock cycle. NTF poles and zeroes loci were evaluated as a function of the two nonideal effects considered separately or combined.

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22

Kondoju, Sai Krishna, and V. V. Mani. "Outage and BER analysis of dual-carrier modulation over frequency-selective Nakagami-m fading channels." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 1 (2017): 90–107. http://dx.doi.org/10.1108/compel-03-2016-0097.

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Purpose This paper aims to the increasing need for high-speed low-power data transmissions over frequency-selective fading channels has drawn attention to suggest dual-carrier modulation (DCM) for multiband orthogonal frequency division multiplexing (OFDM) transceivers for ultra wideband (UWB) wireless personal area network (WPAN). Design/methodology/approach Under frequency-selective fading channel conditions, the decoder is not sufficient enough to decode the transmission bits of severely attenuated data tones. Hence, the authors suggest DCM for a multiband OFDM transceiver because of its multiple capability of providing both frequency diversity and coding gain. It also resulted in low bit-error-rate (BER) at a given signal- to-noise ratio when compared to conventional multiband OFDM system. To achieve an optimised BER, DCM transforms four re-ordered bits into two quaternary phase shift keying symbols and further transforms to two 16-quadrature amplitude modulation-like (16-QAM) symbols with a suitable mapping technique, and at the receiver end, they are decoded with maximum likelihood decision rule. After performing the transformation, the outage probability and average BER expressions are derived to analyse the system performance. Findings DCM is suitable for high data rate transmission and is immune to frequency-selective fading. The outage and BER performance outstands over conventional multiband OFDM transceiver because of the inclusion of DCM mapping. Practical implications It is widely used in WPANs such as high definition multimedia interface and wireless universal serial bus. Originality/value This paper derives novel closed-form outage probability and a tight upper bound on average BER expressions for DCM-based multiband OFDM UWB transceiver over frequency-selective Nakagami-m fading channels for any arbitrary value of m. For this, moment-generating function of sum of squared, independent and identically distributed (i.i.d.) Nakagami-m random variables are used. Further, the system performance is also validated for the case of exponential decaying power delay profile, and the simulation results are provided to check the accuracy of the derived expressions.

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23

Wang, Yanxia, Libo Yang, and Lei Wei. "High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems." EURASIP Journal on Wireless Communications and Networking 2006, no. 1 (2006). http://dx.doi.org/10.1155/wcn/2006/91329.

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24

Rudko, A. S. "FORMATION OF PILOT CHANNELS IN ULTRA-WIDEBAND SYSTEMS WITH ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING TO REDUCE THE PEAK FACTOR IN THE CONDITIONS OF FREQUENCY LIMITS." Educational resources and technology, 2018, 73–77. http://dx.doi.org/10.21777/2500-2112-2018-2-73-77.

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