Advanced Techniques for High Speed Wireless Communications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Advanced Techniques for High Speed Wireless Communications write by Yiqing Zhou. This book was released on 2017-01-27. Advanced Techniques for High Speed Wireless Communications available in PDF, EPUB and Kindle. This dissertation, "Advanced Techniques for High Speed Wireless Communications" by Yiqing, Zhou, 周一靑, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Advanced Techniques for High Speed Wireless Communications" Submitted by Zhou Yiqing for the degree of Doctor of Philosophy at The University of Hong Kong in November 2003 Future wireless communication systems aim to provide extremely high speed data transmission. To improve the data rate in wireless communications, some advanced techniques are investigated in this thesis, including turbo-coded hybrid automatic-repeat-request (ARQ), variable-spreading-factor (VSF) orthogonal frequency and code division multiplexing (OFCDM) systems, and hybrid multi-code interference (MCI) cancellation and minimum mean square error (MMSE) detection. Turbo codes have been proposed in ARQ systems as the forward-error-correction (FEC) codes. Although sub-packet schemes have been proposed in ARQ systems, optimum sub-packet transmission is more effective to maximize throughput in a dynamic channel. Chapter 2 shows that turbo codes illustrate sparse and burst packet error patterns at moderate to high signal-to-noise ratio (SNR). These patterns are suitable for sub-packet schemes. Moreover, sub-packet schemes can provide additional error correction capability with iterative turbo decoding algorithms. An efficient method is proposed to estimate the optimum number of sub-packets, and adaptive sub-packet schemes (i.e. schemes that enable a system to employ different optimum numbers of sub-packets under variable conditions) are suggested to achieve the maximum throughput of the system. Simulations show that the adaptive sub-packet scheme is effective at moderate SNR (e.g. from 2.6dB to 5.0dB) and can provide higher throughput, reduced delay, and lower dropping rate than conventional packet schemes. The broadband VSF-OFCDM system with two-dimensional spreading (time and frequency domain spreading) is becoming a very attractive technique for high speed wireless communications. Assuming slow fading and ideal channel estimation, an analytical study is presented in Chapter 3 on the performance of the VSF-OFCDM system with hybrid MCI cancellation and MMSE detection. The weights of MMSE are derived and updated stage by stage of MCI cancellation. Defining N=NN TF as the total spreading factor, where N and N are the spreading factors in time and T F frequency domain respectively, various values of N and N are dealt with in a T F quadrature-phase-shift-keying(QPSK)-modulated VSF-OFCDM system. It is shown that the hybrid detection scheme performs much better than the pure MMSE. For the hybrid detection, a larger value of N is expected. With hybrid detection, the performance of VSF-OFCDM systems over a fast fading channel is analytically studied in Chapter 4. It is shown that in a fast fading channel, considerable improvement in bit-error-rate (BER) can be achieved by use of a novel code assignment approach. The optimum power ratio of pilot channel to one data channel is about 0.25K, where K is the total number of data channels. When the Doppler frequency f is less than 200Hz, the effect of the Doppler on the system performance is negligible. However, increasing f from 200Hz degrades the system performance rapidly. Although the gap in BER between the hybrid and pure MMSE detection decreases as f increases, the gap is still large as long as f is less than D D around 800Hz. For a wide range of Doppler shift, a larger N is expected, whereas a smaller N provides better performance w
Advanced Techniques for High Speed Wireless Communications
Advanced Techniques for High Speed Wireless Communications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Advanced Techniques for High Speed Wireless Communications write by Yiqing Zhou (Ph.D.). This book was released on 2003. Advanced Techniques for High Speed Wireless Communications available in PDF, EPUB and Kindle.
High-Speed Wireless Communications
High-Speed Wireless Communications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook High-Speed Wireless Communications write by Jiangzhou Wang. This book was released on 2008-10-02. High-Speed Wireless Communications available in PDF, EPUB and Kindle. Analysing and designing reliable and fast wireless networks requires an understanding of the theory underpinning these systems and the engineering complexities of their implementation. This text describes the underlying principles and major applications of high-speed wireless technologies, with emphasis on ultra-wideband (UWB) wireless systems, 3G long term evolution, and 4G mobile networks. Key topics such as cross-layer optimization are discussed in detail and various forms of UWB, including multi-band OFDM UWB, are covered. Recent research developments are described before identifying the scope and direction for future research. The overlay problem (interference problem) in UWB is discussed, and the author aims to illustrate that OFDM is not the best wireless access technique for high speed transmission. Covering the latest technologies in the area, this book will be a valuable resource for graduate students of electrical and computer engineering as well as practitioners in the wireless communications industry.
Wireless Communication
Wireless Communication - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Wireless Communication write by Prashant Ranjan. This book was released on 2022-08-10. Wireless Communication available in PDF, EPUB and Kindle. This reference text will benefit readers in enhancing their understanding of the recent technologies, protocols, and challenges in various stages of development of wireless communication and networking. The text discusses the cellular concepts of 4G, 5G, and 6G along with their challenges. It covers topics related to vehicular technology, wherein vehicles communicate with the traffic and the environment around them using short-range wireless signals. The text comprehensively covers important topics including use of the Internet of Things (IoT) in wireless communication, architecture, and protocols. It further covers the role of smart antennas in emerging wireless technologies. The book Discusses advanced techniques used in the field of wireless communication. Covers technologies including network slicing, 5G wireless communication, and TV white space technology. Discusses practical applications including drone delivery systems, public safety, IoT, virtual reality, and smart cities. Covers radio theory and applications for wireless communication with ranges of centimeters to hundreds of meters. Discusses important topics including metamaterials, inductance coupling for loop antennas, bluetooth low energy, wireless security, and wireless sensor networks. Discussing latest technologies including 5G, 6G, IoT, vehicular technology and TV white space technology, this text will be useful for senior undergraduate, graduate students, and professionals in the fields of electrical engineering, and electronics and communication engineering.
Design of High-speed Communication Circuits
Design of High-speed Communication Circuits - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Design of High-speed Communication Circuits write by Ramesh Harjani. This book was released on 2006. Design of High-speed Communication Circuits available in PDF, EPUB and Kindle. MOS technology has rapidly become the de facto standard for mixed-signal integrated circuit design due to the high levels of integration possible as device geometries shrink to nanometer scales. The reduction in feature size means that the number of transistor and clock speeds have increased significantly. In fact, current day microprocessors contain hundreds of millions of transistors operating at multiple gigahertz. Furthermore, this reduction in feature size also has a significant impact on mixed-signal circuits. Due to the higher levels of integration, the majority of ASICs possesses some analog components. It has now become nearly mandatory to integrate both analog and digital circuits on the same substrate due to cost and power constraints. This book presents some of the newer problems and opportunities offered by the small device geometries and the high levels of integration that is now possible. The aim of this book is to summarize some of the most critical aspects of high-speed analog/RF communications circuits. Attention is focused on the impact of scaling, substrate noise, data converters, RF and wireless communication circuits and wireline communication circuits, including high-speed I/O. Contents: Achieving Analog Accuracy in Nanometer CMOS (M P Flynn et al.); Self-Induced Noise in Integrated Circuits (R Gharpurey & S Naraghi); High-Speed Oversampling Analog-to-Digital Converters (A Gharbiya et al.); Designing LC VCOs Using Capacitive Degeneration Techniques (B Jung & R Harjani); Fully Integrated Frequency Synthesizers: A Tutorial (S T Moon et al.); Recent Advances and Design Trends in CMOS Radio Frequency Integrated Circuits (D J Allstot et al.); Equalizers for High-Speed Serial Links (P K Hanumolu et al.); Low-Power, Parallel Interface with Continuous-Time Adaptive Passive Equalizer and Crosstalk Cancellation (C P Yue et al.). Readership: Technologists, scientists, and engineers in the field of high-speed communication circuits. It can also be used as a textbook for graduate and advanced undergraduate courses.
