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Relevant bibliographies by topics / Ultra-wideband antennas Orthogonal frequency division multiplexing

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Academic literature 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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Journal articles on the topic "Ultra-wideband antennas Orthogonal frequency division multiplexing"

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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 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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Ultra-wideband antennas Orthogonal frequency division multiplexing"

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Xu, Yizhi. "Indoor ranging and geolocation for UWB systems /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20XUY.

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Zhang, Lu. "Timing synchronization algorithm design for MB-OFDM UWB systems /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20ZHANGL.

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Snow, Christopher. "Multiband orthogonal frequency division multiplexing for ultra-wideband wireless communication: analysis, extensions and implementation aspects." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/318.

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Ultra-Wideband (UWB) wireless communication systems employ large bandwidths and low transmitted power spectral densities, and are suitable for operation as underlay systems which reuse allocated spectrum. The subject of this dissertation is Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB for high data-rate communication. We address four main questions: (1) What are the theoretical performance limits and practical system performance of MB-OFDM? (2) What extensions can be used to increase the system power efficiency and range? (3) Is it possible to estimate the system error rate without resorting to time-consuming simulations? and (4) What is the effect of interference from narrowband systems on MB-OFDM, and can this interference be mitigated? As for questions 1 and 2, we investigate the MB-OFDM performance, and propose system enhancements consisting of advanced error correcting codes and OFDM bit-loading. Our methodology includes the development of information-theoretic performance measures and the comparison of these measures with performance results for MB-OFDM and our proposed extensions, which improve the power efficiency by over 6 dB at a data rate of 480 Mbps. To address question 3, we develop novel analytical methods for bit error rate (BER) estimation for a general class of coded multicarrier systems (of which MB-OFDM is one example) operating over quasi-static fading channels. One method calculates system performance for each channel realization. The other method assumes Rayleigh distributed subcarrier channel gains, and leads directly to the average BER. Both methods are also able to account for sum-of-tones narrowband interference. As for question 4, we first present an exact analysis of the uncoded BER of MB-OFDM in the presence of interference from incumbent systems such as IEEE 802.16 ("WiMAX"). We also present a Gaussian approximation for WiMAX interference, and establish its accuracy through comparison with exact analysis and simulations. We then propose a two-stage interference mitigation technique for coded MB-OFDM, consisting of interference estimation during silent periods, followed by metric weighting during decoding, which provides substantial gains in performance in return for modest increases in complexity, and without requiring any modifications to the MB-OFDM transmitter.

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Zheng, Haomian. "Performance and implementation issues of a multi-band OFDM ultra-wideband transceiver /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20ZHENGH.

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Zhang, Pengbei. "Circuit and system design for fully integrated CMOS direct-conversion multi-band OFDM ultra-wideband receivers." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1172692934.

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Onunkwo, Uzoma Anaso. "Timing Jitter in Ultra-Wideband (UWB) Systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10465.

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Timing offsets result from the use of real clocks that are non-ideal in sampling intervals. These offsets also known as timing jitter were shown to degrade the performance of the two forms of UWB systems impulse radio and orthogonal frequency division multiplexing (OFDM)-based UWB. It was shown that for impulse radio, timing jitter distorts the correlation property of the transmitted signal and the resulting performance loss is proportional to the root-mean-square (RMS) value of the timing jitter. For the OFDM-based UWB, timing jitter introduced inter-channel interference (ICI) and the performance loss was dependent on the product of the bandwidth and the RMS of the timing jitter. A number of techniques were proposed for mitigating the performance degradation in each form of UWB. Specifically, for impulse radio, the methods of pulse shaping and sample averaging were provided, whereas for OFDM-based UWB, oversampling and adaptive modulation were given. Through analysis and simulation, it was shown that substantial gain in signal power-to-noise ratio can be achieved using these jitter-reduction methods.

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Aubert, Louis-Marie. "Mise en place d'une couche physique pour les futurs systèmes de radiocommunications hauts débits UWB." Phd thesis, Rennes, INSA, 2005. https://tel.archives-ouvertes.fr/tel-00011745.

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L'UWB (Ultra Wide Band) consiste à transmettre des signaux entre 3. 1 et 10. 6 GHz avec une puissance limitée à -41. 3 dBm/MHz. Pour les communications hauts débits (100 à 500 Mbit/s) et courtes portées (1 à 10 m), les solutions de l'état de l'art reposent sur des traitements numériques complexes. Mitsubishi ITE propose une solution alternative multi-bandes (MB) impulsionnelle basée sur un récepteur non-cohérent. La démodulation OOK est effectuée par une détection d'énergie originale avec un seuillage adapté dynamiquement suivant les conditions de propagation. La parallélisation complète de ce système MB-OOK permet à la fois d'éviter les interférences inter-symboles et de récupérer la quasi totalité de l'énergie disponible. En outre, l'approche impulsionnelle limite les évanouissements du signal sur canal multi-trajets. La comparaison des systèmes MB-OOK et MB-OFDM démontre la pertinence de la solution proposée pour des applications très hauts débits, courte portée et faible consommation<br>The UWB (Ultra Wide Band) consists in transmitting signal between 3. 1 and 10. 6 GHz with a power limited to –41. 3 dBm/MHz. For high data rate (100 to 500 Mbit/s) and short range (1 to 10 m) applications, the state of the art solutions are based on complex digital processing. Mitsubishi ITE proposes an alternative multiband (MB) impulse radio solution based on a non-coherent receiver. The OOK demodulation is done by an original energy detection with a threshold which is adapted dynamically according to propagation conditions. The complete parallelization of this MB-OOK solution allows the system to both avoid inter-symbol interference and recover virtually all available energy. Furthermore the impulsive approach limits multipath channel fading. The comparison of MB-OOK and MB-OFDM systems demonstrates the pertinence of the proposed solution for high data rates and short range applications with low power consumption

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"CMOS ultra-wideband receiver front-end for multi-band OFDM systems." Thesis, 2008. http://library.cuhk.edu.hk/record=b6074550.

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One of the key building blocks in a direct-conversion receiver is the low noise amplifier (LNA), which needs to provide a sufficient gain with a low noise figure for the RF front-end. However, the wideband nature of the receiver imposes harsh requirements on the LNA. It is difficult to achieve desired performance goals over the wide frequency range without excessive power consumption. To deal with this problem, this thesis proposes a novel band-selective UWB LNA. Utilizing the frequency hopping property of the MB-OFDM system, the proposed method switches the operating frequency of the LNA in real time following the MB-OFDM's hopping pattern so that optimal gain and noise performance can be achieved in each frequency band. Unlike the conventional approach, this LNA does not need to cover the entire band simultaneously, thus excessive power consumption is avoided. Fabricated in a 0.18-mum CMOS process, the proposed LNA achieves a peak power gain of 16 dB and a minimum noise figure of 2.74 dB at a low power consumption of less than 12 mW.<br>Other challenges in direct-conversion MB-OFDM receivers include ultra-short band switching time and wide LO frequency range. The single-sideband (SSB) generation is an attractive method for a fast-hopping multi-band LO generator. However, it involves LO frequency synthesis in an open-loop architecture, and thus the spurious-tone performance becomes critical in maintaining the LO signal integrity. Since the accuracy of the SSB generation and the spurious-tone power are difficult to control in a high-frequency operation, a 4.5-GHz SSB upconverter system was fabricated in a standard 0.18-mum CMOS process to investigate its performance against process variation. Some precise quadrature signal generation circuits such as divider and polyphase filter are employed. Experimental results show that the fabricated SSB upconverter system achieves image rejection of higher than 48 dB and spurious-tone suppression of higher than 32 dB.<br>The use of an active downconversion mixer is an alternative to relax the LNA requirements for direct-conversion MB-OFDM UWB receivers. However, its linearity becomes a problem when the bandwidth is ultra wide. In this thesis, the static current bleeding technique is used in the UWB downconversion mixer to improve its linearity. By injecting a DC current to the RF transconductor for linearization, the mixer's transconductance is enhanced while the noise from the LO switches is not affected. As a result, the conversion gain increases and the noise figure improves. Fabricated in a 0.18-mum CMOS process, the UWB downconversion mixer achieves a peak conversion gain of 4.1 dB, a peak IIP3 of --2.5 dBm, and a minimum double-sideband (DSB) noise figure of 11.7 dB at a low power consumption of 6 mW.<br>Ultra-wideband (UWB) is a short-range, high-data-rate communication system for Wireless Personal Area Networks (WPAN) based on the IEEE 802.15.3a physical layer standard. The allocated frequency range is from 3.1 to 10.6 GHz, in which 14 bands are defined. The first band group, which is assigned to the mandatory Mode 1 devices, consists of three bands. In UWB systems, multi-band orthogonal frequency division multiplexing (MB-OFDM) is the dominant modulation scheme for its high spectral flexibility and its similarity in communication architecture with other existing wireless communication standards, such as IEEE 802.11a/b/g and WiMAX. For practical reasons, the direct-conversion architecture is widely considered the best architecture to implement an MB-OFDM UWB receiver, which has advantages of low power consumption and high integration level. Nevertheless, there are some performance limitations in direct-conversion MB-OFDM UWB receivers. In this thesis, some key building blocks in the RF front-end of the direct-conversion MB-OFDM UWB receivers for use in Mode 1 devices are investigated to overcome such limitations.<br>Tang, Siu Kei.<br>"May 2008."<br>Adviser: Pun Kong Pang.<br>Source: Dissertation Abstracts International, Volume: 70-03, Section: B, page: 1857.<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2008.<br>Includes bibliographical references (p. 161-169).<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Abstracts in English and Chinese.<br>School code: 1307.

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"Robust, low complexity and energy efficient baseband receiver design for MB-OFDM UWB." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075532.

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Architectures of matched filter in packet detector, CFO corrector, FFT output reorder buffer and phase tracking block are optimized for low complexity. Implemented in O.13-mum CMOS technology, the proposed baseband receiver system has the core area of 2.5 mm2 and the estimated power consumption is 170 mW, which is equivalent to the energy efficiency of 88 pJ/b at 480 Mbps data rate. The implementation results verify the robustness, low complexity and power efficiency of the proposed MB-OFDM UWB baseband receiver.<br>As an OFDM-based system, MB-OFDM UWB is vulnerable and sensitive to carrier frequency offset (CFO). We employ multipartite table method (MTM) to implement arctangent and sin/cos functions for frequency synchronization. Compared with traditional algorithms, MTM has the advantages of low cost, low power consumption and higher processing speed. Residual phase distortion is corrected by a highly simplified phase tracking method, which also has better performance compared with traditional phase tracking scheme.<br>Synchronization plays the key role for the performance of the whole baseband receiver system. In this dissertation, a dual-threshold (DT) packet detection scheme is proposed for timing synchronization. Compared with traditional cross-correlation algorithm, DT has much better detection performance, especially in high noise environment.<br>Ultra-wideband (UWB) technology, targeting at wireless personal area networks (WPANs),brings the convenience of high-speed and short-range wireless interconnects. As a novel communication technique, multi-band orthogonal frequency division multiplexing (MB-OFDM) UWB has the features of high spectrum efficiency, multiple access capability and robustness against narrow band interference. However, its inherent high complexity and the requirement of powerful processing for good performance are the obstacles for practical application.<br>Fan, Wen.<br>Adviser: Choy Chiu-Sing.<br>Source: Dissertation Abstracts International, Volume: 73-04, Section: B, page: .<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (leaves 105-112).<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Abstract also in Chinese.

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"Performance evaluation of OFDM de-modulator with various multiplier architectures for UWB system." 2010. http://library.cuhk.edu.hk/record=b5894391.

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Chan, Pui Wai.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2010.<br>Includes bibliographical references (leaves 81-83).<br>Abstracts in English and Chinese.<br>Abstract --- p.ii<br>Acknowledgement --- p.iv<br>Contents --- p.v<br>Chapter I. --- Introduction --- p.1<br>Chapter II. --- Details of UWB System --- p.3<br>Background --- p.3<br>Technical Information --- p.3<br>Applications --- p.11<br>Chapter III. --- Theoretical Explanation on Orthogonal Frequency Division Multiplexing (OFDM) Technology --- p.13<br>Chapter IV. --- Design of OFDM De-modulator --- p.21<br>Multipath Delay Commutator (MDC) --- p.24<br>Single-path Delay Feedback (SDF) --- p.25<br>Multipath Delay Feedback (MDF) --- p.27<br>Chapter V. --- Designs of Multipliers in UWB FFT module --- p.33<br>Twiddle Factor Multiplication - Group 1 --- p.33<br>Twiddle Factor Multiplication - Group 2 --- p.34<br>Twiddle Factor Multiplication - Group 3 --- p.45<br>Baugh-Wooley Algorithm --- p.46<br>Modified-Booth Algorithm --- p.47<br>Hardware Architecture of Multipliers --- p.54<br>Partial Product Accumulator - Array Architecture --- p.55<br>Partial Product Accumulator - Tree Architecture --- p.59<br>Fixed-width Multiplier --- p.61<br>Chapter VI. --- Comparison Methodology --- p.65<br>Standard Cell Design Flow --- p.66<br>FPGA Design Flow --- p.69<br>Chapter VII. --- Simulation Results and Discussion --- p.71<br>Simulation results of FFT module using Standard Cell Methodology --- p.71<br>Simulation results of FFT module using FPGA Methodology --- p.74<br>Discussion on Simulation results of FFT module using ASIC and FPGA Methodology --- p.77<br>Area / Slice Usage --- p.77<br>Power Consumption --- p.77<br>APS/SPS --- p.78<br>General Guidelines For Designing FFT Module For Other Systems --- p.78<br>Chapter VIII. --- Conclusion --- p.80<br>Chapter IX. --- Future Works --- p.80<br>Reference --- p.81

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Books on the topic "Ultra-wideband antennas Orthogonal frequency division multiplexing"

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Siriwongpairat, W. Pam. Ultra-wideband communications systems: Multiband OFDM approach. John Wiley, 2007.

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Liu, K. J. Ray, and W. Pam Siriwongpairat. Ultra-Wideband Communications Systems: Multiband OFDM Approach. Wiley & Sons, Incorporated, John, 2007.

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Ultra-Wideband Communications Systems: Multiband OFDM Approach (Wiley Series in Telecommunications & Signal Processing). Wiley-IEEE Press, 2007.

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An Analysis of Electromagnetic Interference (EMI) of Ultra Wideband(UWB) and IEEE 802.11A Wireless Local Area Network (WLAN) Employing Orthogonal Frequency Division Multiplexing (OFDM). Storming Media, 2004.

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Book chapters on the topic "Ultra-wideband antennas Orthogonal frequency division multiplexing"

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Saberinia, Ebrahim, and Ahmed H. Tewfik. "Orthogonal Frequency Division Multiplexing for Ultra Wideband Communications." In Ultra Wideband Wireless Communication. John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/9780470042397.ch12.

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Khatun, Sabira, Rashid A. Saeed, Nor Kamariah Nordin, and Borhanuddin Mohd Ali. "Ultra-Wideband Solutions for Last Mile Access Network." In Encyclopedia of Multimedia Technology and Networking, Second Edition. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-014-1.ch195.

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Ultra-wideband (UWB) is an alternative wireless communications technology that offers high bandwidth wireless communications without the constraints of spectrum allocation. Fundamentally different from conventional radio frequency communications, UWB relies on a series of narrow, precisely timed pulses to transmit digital data. Transmitters and receivers that use UWB can be much simpler to build than their conventional counterparts, resulting in lower cost and higher power efficiency. Moreover, the inherent properties of UWB emissions allow them to potentially coexist with conventional wireless systems on a noninterfering basis. In April 2002, the Federal Communications Commission (FCC) released UWB emission masks and introduced the concept of coexistence with traditional and protected radio services in the frequency spectrum, which allows the operation of UWB systems mainly in the 3.1 to 10.6 GHz band, limiting the power level emission to -41dBm/MHz. Within the power limit allowed under the current FCC regulations, Ultra-wideband can not only carry huge amounts of data over a shortto- medium distance at very low power (this range can be extended by using ad-hoc or mesh networks), but it also has the ability to carry signals through doors and other obstacles that tend to reflect signals at more limited bandwidths and a higher power (Reed, 2005). At higher power levels, UWB signals can travel to significantly greater ranges. In March 2005, the FCC granted the waiver request, filed by the multiband Orthogonal Frequency Division Multiplexing (OFDM) alliance (MBOA), in which it approved the change in measurement for the all UWB technologies (neutral approach) (Barret, 2005). The FCC’s waiver grants effectively removes the previous transmit power penalties for both frequency-hopping (OFDM) and gated UWB technologies (TH and DS). Hence, they are allowed to transmit at higher power levels and then become idle for some time, as long as they meet the limits for average power density. This new rules allow those technologies to achieve up to four times better performance and double the range.

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Conference papers on the topic "Ultra-wideband antennas Orthogonal frequency division multiplexing"

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Novakov, Emil. "A low complexity Ultra-Wideband, Orthogonal Frequency Division Multiplexing communication system." In 2011 XXXth URSI General Assembly and Scientific Symposium. IEEE, 2011. http://dx.doi.org/10.1109/ursigass.2011.6050564.

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Din, Chempaka Mohd, Wahidah Mansor, and Roslina Mohamad. "A review on modulation techniques in multiband-orthogonal frequency division multiplexing in ultra-wideband channel." In Informatics (ISCI). IEEE, 2011. http://dx.doi.org/10.1109/isci.2011.5958980.

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He, Jing, Teng Li, Xuejie Wen, Ming Chen, and Lin Chen. "An ISFA-combined pilot-aided channel estimation scheme in multiband orthogonal frequency division multiplexing ultra-wideband over fiber system." In 2015 20th IEEE Symposium on Computers and Communication (ISCC). IEEE, 2015. http://dx.doi.org/10.1109/iscc.2015.7405630.

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