Download or read book Performance Study of ARQ type Strategies and Adaptive Modulation for Transmission on Fading Channels written by Kenneth Chee Kum Cheong and published by . This book was released on 2000 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Joint AMC ARQ Transmission in Wireless Systems with Finite length Transmit Buffers written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive modulation and coding (AMC) and automatic repeat request (ARQ) are two of the most important techniques to overcome the limitations of the wireless channel. and to thereby improve quality of service (QnS) over wireless networks. Traditionally, the performance of these two techniques have been designed and analyzed separately. In this thesis. we develop a novel cross-layer design of joint AMC-ARQ transmission for wireless systems and analyze its performance while taking into account the finite-length buffer constraint at the transmitter. This work differs from previous works in that it considers the effect of the transmitter buffer size and the different ARQ strategies in the design and performance analysis- In particular, a new buffer-assisted AMC strategy is presented in which the data rate is selected based on channel fading conditions as well as the status of the transmit buffer. We Carry out detailed performance analysis of the proposed systems with different traffic arrival patterns and buffer management strategies. based on the Markov chain theory- Mathematical analysis and simulations show that an all retransmit (AR) retransmission strategy achieves the best performance and power efficiency amongst all retransmission strategies. The results also indicate that a partial retransmit (PR) strategy would provide a fair tradeoff between improved performance and increased receiver complexity. Further. we show that the buffer-assisted AMC technique can improve the transmission reliability when compared to the traditional channel-based AMC strategy.

Download or read book Joint AMC ARQ Transmission in Wireless Systems with Finite length Transmit Buffers written by Sanal Sasankan and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adaptive Coding and Transmitter Diversity for Slow Fading Channels written by Zulfiquar Sayeed and published by . This book was released on 1996 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analytical Evaluation of Adaptive Transmission Protocols for Markov Models of Channels with Fading and Moderate Shadowing written by Sneha L. Kottapalli and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Adaptive transmission protocols are often employed to communicate over wireless channels with fading and other time-varying propagation losses. The protocols compensate for the propagation losses and maintain high throughput by adjusting transmission parameters in response to the channel variations. Performance evaluations for practical adaptive transmission protocols typically require simulation of both the time-varying processes and the procedure by which the protocol derives information about the channel quality. In this thesis, we develop an analytical method to evaluate the performance of two practical protocols, an adaptive coding protocol and an adaptive modulation and coding protocol, which rely on statistics derived from the demodulation process. Our method for performance analysis avoids the need for simulations of the adaptive protocols and the derivation of statistics that are used for adaptation; furthermore, our approach avoids the simulation of the time-varying channel.

Download or read book Throughput Performance of Adaptive GBN ARQ Schemes in Rayleigh Fading Channels written by Anil Mehta and published by . This book was released on 2003 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mobile WiMAX written by Yan Zhang and published by CRC Press. This book was released on 2007-12-10 with total page 431 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wireless Metropolitan Area Network (WirelessMAN) is a promising Broadband Wireless Access (BWA) technology that provides high-speed, high-bandwidth efficiency and high-capacity multimedia services for both residential and enterprise applications. Mobile WiMAX: Toward Broadband Wireless Metropolitan Area Networks examines the basic concepts, rec

Download or read book Adaptive Modulation Techniques for Bandwidth and Power Efficient Communication written by Muhammad Kaleem Munawwar Khodabacchas and published by . This book was released on 2016 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cognitive Radio (CR) describes a system which adapts to the environment in which it is operating and adjusts to its radio operating parameters dynamically and autonomously. It also learns from the actions undertook and its subsequent responses in the current environment. Progress in the field of radio technology enabled radios to manage their power, time and bandwidth resources in order to make best possible use of available spectrum. This project investigates how, when given a spectrum opportunity, one can transmit at lower possible power level that still maintains adequate secondary user Bit Error Rate (BER) performance. The bandwidth availability in cognitive radio dynamically change, and therefore adaptive modulation techniques may be used to most effectively utilise available bandwidth, while minimising interference to primary users. Moreover, techniques for monitoring the Signal-to-Noise ratio (SNR), Eb/No, and for adapting the modulation are also investigated. Analytical methods and digital communication systems simulations are devised. In addition, the performances of adaptive systems are presented. Furthermore, the performance results were obtained for adaptive systems transmitting over a Jakes model, Rayleigh Fading Channel. Both cases of very fast and slow fading Rayleigh channel and adapting to the changes in average SNR, Eb/No, therein are investigated.

Download or read book Using Cross Layer Techniques for Communication Systems written by Rashvand, Habib F. and published by IGI Global. This book was released on 2012-04-30 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the existing layering infrastructure--used globally for designing computers, data networks, and intelligent distributed systems and which connects various local and global communication services--is conceptually correct and pedagogically elegant, it is now well over 30 years old has started create a serious bottleneck. Using Cross-Layer Techniques for Communication Systems: Techniques and Applications explores how cross-layer methods provide ways to escape from the current communications model and overcome the challenges imposed by restrictive boundaries between layers. Written exclusively by well-established researchers, experts, and professional engineers, the book will present basic concepts, address different approaches for solving the cross-layer problem, investigate recent developments in cross-layer problems and solutions, and present the latest applications of the cross-layer in a variety of systems and networks.

Download or read book On the Achievable Rate of Stationary Fading Channels written by Meik Dörpinghaus and published by Springer. This book was released on 2013-07-15 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volumes discusses various aspects regarding the capacity/achievable data rate of stationary Rayleigh fading channels. First, it analyses bounds on the achievable data rate with zero-mean proper Gaussian input symbols, which are capacity achieving in the coherent case, i.e., in case of perfect channel knowledge at the receiver. These bounds are tight in the sense that the difference between the upper and the lower bound is bounded for all SNRs. The lower bound converges to the coherent capacity for asymptotically small channel dynamics. Furthermore, these bounds are extended to the case of multiple-input multiple-output (MIMO) channels and to the case of frequency selective channels. In a further part, the present work studies the achievable rate with receivers based on synchronized detection and a code-aided channel estimation. For a specific type of such a receiver an approximate upper bound on the achievable rate is derived. The comparison of this approximate upper bound and the achievable data rate with receivers using synchronized detection based on a solely pilot based channel estimation gives an approximate upper bound on the possible gain by using this kind of code-aided channel estimation in comparison to the conventional receiver using a solely pilot based channel estimation. In addition, the achievable data rate with an optimal joint processing of pilot and data symbols is studied and a lower bound on the achievable rate for this case is derived. In this context, it is also shown which part of the mutual information of the transmitter and the receiver is discarded when using the conventional receiver with synchronized detection based on a solely pilot based channel estimation.

Download or read book Mobile Fading Channels written by Matthias Pätzold and published by Wiley-Blackwell. This book was released on 2002-04 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile channel fading is a loss in transmission intensity caused by changes in the transmission medium. By dealing with the modelling, analysis and simulation of mobile fading channels this text provides a fundamental understanding of many issues in the area of mobile fading channel modelling.; The main topics addressed in the volume are: fundamentals of stochastic and deterministic channel models and modelling and simulation of frequency-nonselective and frequency-selective fading channels. The guide also features methods for the design and realization of efficient channel simulators and fast channel simulators and MATLAB-programs for the evaluation and simulation of mobile fading channels.

Download or read book Handbook of Research on Next Generation Mobile Communication Systems written by Panagopoulos, Athanasios D. and published by IGI Global. This book was released on 2015-08-26 with total page 635 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anyone who has ever shopped for a new smart phone, laptop, or other tech gadget knows that staying connected is crucial. There is a lot of discussion over which service provider offers the best coverage—enabling devices to work anywhere and at any time—with 4G and LTE becoming a pervasive part of our everyday language. The Handbook of Research on Next Generation Mobile Communication Systems offers solutions for optimal connection of mobile devices. From satellite signals to cloud technologies, this handbook focuses on the ways communication is being revolutionized, providing a crucial reference source for consumers, researchers, and business professionals who want to be on the frontline of the next big development in wireless technologies. This publication features a wide variety of research-based articles that discuss the future of topics such as bandwidth, energy-efficient power, device-to-device communication, network security and privacy, predictions for 5G communication systems, spectrum sharing and connectivity, and many other relevant issues that will influence our everyday use of technology.

Download or read book Adaptive Transmission for Block fading Channels written by Khoa Dang Nguyen and published by . This book was released on 2009 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the analysis and design of adaptive transmission schemes to improve the outage performance of both single and multiple-antenna transmission over the block-fading channel, especially for the cases where discrete input constellations are used.

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 2304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adaptive Transmission Techniques for Fading Channels written by David M. Zook and published by . This book was released on 2003 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adaptive Hybrid ARQ Using Convolutional and Turbo Codes on Fading Channels and Its Application to the Third generation Wireless Communications written by Youngheon Kim and published by . This book was released on 2002 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Wireless Communication written by David Tse and published by Cambridge University Press. This book was released on 2005-05-26 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook takes a unified view of the fundamentals of wireless communication and explains cutting-edge concepts in a simple and intuitive way. An abundant supply of exercises make it ideal for graduate courses in electrical and computer engineering and it will also be of great interest to practising engineers.