Download or read book Performance Analysis of Variable Code Rate Signals Transmitted Over Frequency Nonselective Slowly Fading Channels in a Pulse Interference Environment written by and published by . This book was released on 2005 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless systems, including wireless local area networks (WLAN) and cellular networks, are increasingly being used for both commercial and military applications. For military applications, it is important to analyze the effect of interference on wireless communications systems. The objective of this research is to investigate the performance of variable code rate signals transmitted over frequency-nonselective, slowly fading channels in a worst case, pulse-noise interference environment. Both binary phase-shift keying (BPSK) and noncoherently detected binary frequency-shift keying (NCBFSK) are considered. System performance with both Viterbi hard decision decoding (HDD) and soft decision decoding (SDD) is analyzed for additive white Gaussian noise (AWGN) alone and for AWGN plus pulse-noise interference for various receiver types and conditions of channel fading. The effect of varying the code rate, both for HDD and SDD, is examined. The amplitude of the signal power a(exp 2)/(sub c) is modeled as a random variable, and the channel is modeled as either Rayleigh fading or Ricean fading, depending on the modulation under consideration.

Download or read book On the Achievable Rate of Stationary Fading Channels written by Meik Dörpinghaus and published by Springer Science & Business Media. This book was released on 2011-08-14 with total page 317 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 Performance Analysis of a Variable Data Rate TCM Waveform Transmitted Over a Channel with AWGN and Pulse noise Interference written by and published by . This book was released on 2007 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trellis-coded modulation (TCM) is a technique where forward error correction coding and modulation are treated in a single operation without increasing the channel bandwidth. In this thesis the performance of a variable data rate TCM waveform transmitted over a channel is investigated. In general, TCM systems with rate 1/2 and rate 2/3 convolutional codes and quadrature-shift keying (QPSK) and 8-phase-shift keying (PSK) modulation, respectively, are considered. The data rate of the later TCM system is 50% faster than that of the former. Two cases are considered. In the first case, the number of memory elements K remains constant as the code rate increases. In the second case, the number of memory elements increases linearly with code rate, so that the total number of memory elements for 8-PSK, r=2/3 TCM is given by 1/ 2 2 K K =, where 1/ 2 K is the number of memory elements for the QPSK, r=1/2 convolutionally encoded TCM system. The effects of pulse-noise interference (PNI) in addition to additive white Gaussian noise (AWGN) are considered. It was found that both TCM systems have significant resistance to PNI when K is large enough.

Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1989 with total page 1722 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Digital Communication over Fading Channels written by Marvin K. Simon and published by John Wiley & Sons. This book was released on 2005-02-11 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: The four short years since Digital Communication over Fading Channels became an instant classic have seen a virtual explosion of significant new work on the subject, both by the authors and by numerous researchers around the world. Foremost among these is a great deal of progress in the area of transmit diversity and space-time coding and the associated multiple input-multiple output (MIMO) channel. This new edition gathers these and other results, previously scattered throughout numerous publications, into a single convenient and informative volume. Like its predecessor, this Second Edition discusses in detail coherent and noncoherent communication systems as well as a large variety of fading channel models typical of communication links found in the real world. Coverage includes single- and multichannel reception and, in the case of the latter, a large variety of diversity types. The moment generating function (MGF)-based approach for performance analysis, introduced by the authors in the first edition and referred to in literally hundreds of publications, still represents the backbone of the book's presentation. Important features of this new edition include: * An all-new, comprehensive chapter on transmit diversity, space-time coding, and the MIMO channel, focusing on performance evaluation * Coverage of new and improved diversity schemes * Performance analyses of previously known schemes in new and different fading scenarios * A new chapter on the outage probability of cellular mobile radio systems * A new chapter on the capacity of fading channels * And much more Digital Communication over Fading Channels, Second Edition is an indispensable resource for graduate students, researchers investigating these systems, and practicing engineers responsible for evaluating their performance.

Download or read book Performance Analysis of Trellis Codes Transmitted Over Fading Channels written by Chinthananda Tellambura and published by . This book was released on 1993 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Trellis Codes Transmitted Over Fading Channels written by Chintha Tellambura and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.

Download or read book Performance Analysis of an Alternative to Trellis Coded Modulation for Waveforms Transmitted Over a Channel with Pulse Noise Interference written by and published by . This book was released on 2008 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of a communication system having almost the same spectral efficiency as a trellis coded modulation (TCM) system with r = 2/3 convolutional encoding and 8-ary phase-shift keying (8-PSK) modulation is investigated. TCM is a common solution to the problem of adding forward error correction (FEC) coding without an attendant increase in channel bandwidth. The primary drawback to TCM is that the achievable coding gain is limited by the maximum practical number of states in the convolutional encoder. The alternative system considered uses (63, 37) Reed-Solomon (RS) encoding. The six-bit symbols at the output of the Reed-Solomon encoder undergo serial-to-parallel conversion to two three-bit symbols, which are then independently transmitted on the in-phase (I) and quadrature (Q) component of the carrier using 8-ary biorthogonal keying (8-BOK). This system has a null-to-null bandwidth of 0.993Rb, which is 0.7% smaller than TCM with r = 2/3 convolutional encoding and 8-PSK modulation. The two waveforms are compared for the relatively benign case where additive white Gaussian noise (AWGN) is the only noise present as well as when pulse-noise interference (PNI) is present. It was found that both systems have almost the same performance in AWGN, but with PNI the alternative system has better performance.

Download or read book Adaptive Rate Coding for A CDMA Systems Over Slowly Fading Channels written by Vidhyacharan Bhaskar and published by LAP Lambert Academic Publishing. This book was released on 2010-12 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation incorporates rate adaptation schemes for direct sequence spread spectrum systems. Subspace and pilot-aided methods for channel estimation can be used to estimate the nature of time varying channels. The simulated performance of punctured and repetition codes agrees well with the upper and lower theoretical bounds in hard-decision decoding over Rayleigh and Rician fading channels. The expression for the upper bound on soft-decision decoding is also derived and plotted. An adaptive forward error correction (FEC) coding scheme is proposed to combat the detrimental effects of fading in a mobile multiuser environment. The throughput of the proposed adaptive FEC scheme reaches the highest code rate of the punctured convolutional code used. The throughput of the proposed hybrid automatic repeat request (H-ARQ) scheme exceeds that of the generalized H-ARQ scheme for high signal to noise ratios.

Download or read book Principles of Mobile Communication written by Gordon L. Stüber and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles of Mobile Communication provides an authoritative treatment of the fundamentals of mobile communications, one of the fastest growing areas of the modern telecommunications industry. The book stresses the fundamentals of mobile communications engineering that are important for the design of any mobile system. Less emphasis is placed on the description of existing and proposed wireless standards. This focus on fundamental issues should be of benefit not only to students taking formal instruction but also to practising engineers who are likely to already have a detailed familiarity with the standards and are seeking to deepen their knowledge of this important field. The book stresses mathematical modeling and analysis, rather than providing a qualitative overview. It has been specifically developed as a textbook for graduate level instruction and a reference book for practising engineers and those seeking to pursue research in the area. The book contains sufficient background material for the novice, yet enough advanced material for a sequence of graduate level courses. Principles of Mobile Communication treats a variety of contemporary issues, many of which have been treated before only in the journals. Some material in the book has never appeared before in the literature. The book provides an up-to-date treatment of the subject area at a level of detail that is not available in other books. Also, the book is unique in that the whole range of topics covered is not presently available in any other book. Throughout the book, detailed derivations are provided and extensive references to the literature are made. This is of value to the reader wishing to gain detailed knowledge of a particular topic.

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 Performance of Latency Constrained Turbo like Codes Over Correlated Fading Channels written by Hamid Mahvidi and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of interleaving transmitted symbols over fading channels is investigated. Clarke's model is used to simulate a correlated flat fading channel. The performance of block interleaved convolutional codes is studied in terms of bit and word interleavers and their equivalent super channels. It is shown that a bit interleaved channel can be represented in terms of a super channel of equivalent Doppler spread. Performance of various interleaved convolutional codes is compared to those of non-interleaved turbo-like codes in a correlated fading environment. Simulation results indicate that under stringent delay constraints such as voice communications, interleaved convolutional codes outperform turbo-like codes. However at more relaxed delay constraints of a few thousand bits, non-interleaved turbo-like codes are capable of outperforming convolutional codes.

Download or read book Analysis of the Error Performance of Trellis coded Modulations in Rayleigh Fading Channels written by and published by . This book was released on 1989 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trellis-coded modulation (TCM), when combined with interleaving, is known to give good error performance in fading channels. Previously, the only analytical guide was an upper bound, which could be very loose over the range of the signal to noise ratio of interest. This paper presents an exact expression for the pairwise error event probability of TCM transmitted over Rayleigh fading channels. It includes PSK and multilevel QAM codes, as well as coherent and partially coherent detection. The paper also studies several coded modulation schemes this way.

Download or read book Performance Analysis of an Alternative Link 16 JTIDS Waveform Transmitted Over a Channel with Pulse noise written by Ho Kah Wei and published by . This book was released on 2008 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequency-hopped, direct sequence spread spectrum system that utilizes a (31, 15) Reed-Solomon (RS) code and cyclical code-shift keying modulation for the data packets, where each encoded symbol consists of five bits. The primary drawback to JTIDS is the limited data rate. In this thesis, an alternative waveform consistent with the existing JTIDS waveform but with twice the data rate is analyzed. The system to be considered also uses (31, 15) RS encoding, but each pair of five-bit symbols at the output of the RS encoder undergoes serial-to-parallel conversion to two five-bit symbols, which are then independently transmitted on the in-phase and quadrature component of the carrier using 32-ary orthogonal signals with a diversity of two. In this thesis, only coherent detection is considered. The performance obtained with the alternative JTIDS waveform is compared with the existing JTIDS waveform when only additive white Gaussian noise (AWGN) is present as well as when pulse-noise interference (PNI) is also present. Errors-and-erasures decoding (EED), errors-only decoding and perfect side information (PSI) are also considered.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1989 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding LTE with MATLAB written by Houman Zarrinkoub and published by John Wiley & Sons. This book was released on 2014-01-28 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to technical details related to the Physical Layer of the LTE standard with MATLAB® The LTE (Long Term Evolution) and LTE-Advanced are among the latest mobile communications standards, designed to realize the dream of a truly global, fast, all-IP-based, secure broadband mobile access technology. This book examines the Physical Layer (PHY) of the LTE standards by incorporating three conceptual elements: an overview of the theory behind key enabling technologies; a concise discussion regarding standard specifications; and the MATLAB® algorithms needed to simulate the standard. The use of MATLAB®, a widely used technical computing language, is one of the distinguishing features of this book. Through a series of MATLAB® programs, the author explores each of the enabling technologies, pedagogically synthesizes an LTE PHY system model, and evaluates system performance at each stage. Following this step-by-step process, readers will achieve deeper understanding of LTE concepts and specifications through simulations. Key Features: • Accessible, intuitive, and progressive; one of the few books to focus primarily on the modeling, simulation, and implementation of the LTE PHY standard • Includes case studies and testbenches in MATLAB®, which build knowledge gradually and incrementally until a functional specification for the LTE PHY is attained • Accompanying Web site includes all MATLAB® programs, together with PowerPoint slides and other illustrative examples Dr Houman Zarrinkoub has served as a development manager and now as a senior product manager with MathWorks, based in Massachusetts, USA. Within his 12 years at MathWorks, he has been responsible for multiple signal processing and communications software tools. Prior to MathWorks, he was a research scientist in the Wireless Group at Nortel Networks, where he contributed to multiple standardization projects for 3G mobile technologies. He has been awarded multiple patents on topics related to computer simulations. He holds a BSc degree in Electrical Engineering from McGill University and MSc and PhD degrees in Telecommunications from the Institut Nationale de la Recherche Scientifique, in Canada. www.wiley.com/go/zarrinkoub