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Author: Tahir Conka Publisher: ISBN: 9781423560920 Category : Languages : en Pages : 90
Book Description
In this thesis, the performance analysis of a non-coherent Differential Phase Shift Keying (DPSK) receiver using Post-Detection Selection Combining techniques over a Rayleigh fading channel is investigated. Post- Detection Selection Combining (PDSC) is evaluated and compared to Equal Gain Combining (EGC) and Selection Combining (SC), the two common diversity techniques discussed in the literature. Numerical results obtained for Post- Detection Selection Combining are compared to Selection Combining and Equal Gain Combining. The Post-Detection Selection Combining method is shown to be superior to the Selection Combining method but inferior to Equal Gain Combining method for a non-coherent DPSK receiver operating over a Rayleigh fading channel.
Author: Tahir Conka Publisher: ISBN: 9781423560920 Category : Languages : en Pages : 90
Book Description
In this thesis, the performance analysis of a non-coherent Differential Phase Shift Keying (DPSK) receiver using Post-Detection Selection Combining techniques over a Rayleigh fading channel is investigated. Post- Detection Selection Combining (PDSC) is evaluated and compared to Equal Gain Combining (EGC) and Selection Combining (SC), the two common diversity techniques discussed in the literature. Numerical results obtained for Post- Detection Selection Combining are compared to Selection Combining and Equal Gain Combining. The Post-Detection Selection Combining method is shown to be superior to the Selection Combining method but inferior to Equal Gain Combining method for a non-coherent DPSK receiver operating over a Rayleigh fading channel.
Author: Marvin K. Simon Publisher: John Wiley & Sons ISBN: 0471715239 Category : Science Languages : en Pages : 936
Book Description
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.
Author: Dimitrios Makrakis Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The objective of this thesis is to introduce new power efficient non-coherent receiver structures for linear (Quadrature Amplitude Modulated and Phase Shift Keyed) as well as Continuous Phase Modulated signals. A generalized non-coherent detection theory, addressing single or multi-amplitude/phase signals as well as operation in time dispersive channels has been developed. Structures of optimal non-coherent sequence estimators and symbol-by-symbol receivers are proposed. The analysis carried out provides the relation and link between existing non-coherent receivers and the optimal non-coherent detection concept. Using the framework set by the generalized non-coherent detection theory and applying approximations and reasonable simplifications wherever needed, we were able to propose new families of powerful, yet simple non-coherent receivers. Such receivers are the: (1) Block Decoders for PSK and CPM signals. They process the received signal information in a block form. Evaluation of them in both ideal and time dispersive channels has verified considerable gains (as compared to conventional differential receivers), especially when used with trellis coded schemes. The evaluation results have indicated improvements higher than 3 dB when the operation takes place in a Gaussian channel. In a faded channel, the results have shown improvements higher than 7 dB and a reduction in error floors close to one order of magnitude. (2) Asymptotically optimal decoders for a time dispersive channel and/or multi-amplitude/phase signals. They have been able to considerably improve the system's performance. When evaluated for uncoded and coded schemes they demonstrated excellent performance. Compared to the conventional differential receiver the results demonstrated improvements in excess of 5 dB. With the introduction of these receivers the extension of non-coherent technology to the power and bandwidth efficient family of the multi-amplitude/phase signals has been made possible. (3) Combined Squared Envelope and Multiple Differential Detection (recursive) Algorithms. They process the information provided by the use of a squared envelope and more than one (multiple) differential receivers in a recursive form. When evaluated with various linear and CPM signals they demonstrated considerable improvements. For white Gaussian noise channels, they achieved gains higher than 9 dB (compared to the conventional differential receiver). In a faded channel they were able to reduce the error floors by more than three orders of magnitude. (4) Symbol-by-symbol receivers based on phase correction and signal combining controlled by decision feedback. These receivers achieve their improvements by applying partial (decision directed) intersymbol interference (ISI) cancellation from the phase of the signal and by combining the outputs of more than one differential detector according to the decisions made regarding previous symbols. Evaluations have demonstrated improvements higher than 5 dB. In all of the above proposed receivers, a particular emphasis has been put on the simplicity factor. Possible efficient implementation scenarios of the receivers using today's digital signal processing technology are discussed in various parts of the present work. To evaluate the proposed schemes, an analytical framework has been developed. It covers evaluation in AWGN (ideal or time dispersive) as well as faded channels. Through this analysis, new distance expressions (equivalent to the Euclidean distance we encounter in coherent systems) which characterize the performance of the proposed non-coherent receivers have been identified. These distance metrics can be used for the design of improved coded schemes, developed to "match" the characteristics and operation principles of the proposed non-coherent receivers.
Author: Publisher: ISBN: Category : Engineering Languages : en Pages : 2152
Book Description
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.
Author: Francis C.M. Lau Publisher: Springer Science & Business Media ISBN: 9783540006022 Category : Computers Languages : en Pages : 244
Book Description
One of the first books in this area, this text focuses on important aspects of the system operation, analysis and performance evaluation of selected chaos-based digital communications systems – a hot topic in communications and signal processing.
Author: Tahir Conka
Author: Tahir Conka
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Author: Marvin K. Simon
Author: Shi Hong (M.E.)
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Author: Dimitrios Makrakis
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Author: Francis C.M. Lau