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Author: Liang Chi Publisher: ISBN: 9781303049545 Category : Spread spectrum communications Languages : en Pages : 111
Book Description
In our dissertation, we focus on the SESS application with enhanced diversity in different transmission scenario such as multiple access, multichannel and multi-carrier techniques. Unlike the single user situation, there are two major sources of interference in the multiple access transmission system: one is multiple access interference (MAI) and the other is multipath interference (MI). The former occurs due to the cross correlation of CDMA codes and the latter is caused by the combined effect of out-of-phase autocorrelation and cross correlation of spreading codes used by the system in a multipath channel. The performance of the SESS based CDMA with two major impairing effects will be discussed in this dissertation.
Author: Liang Chi Publisher: ISBN: 9781303049545 Category : Spread spectrum communications Languages : en Pages : 111
Book Description
In our dissertation, we focus on the SESS application with enhanced diversity in different transmission scenario such as multiple access, multichannel and multi-carrier techniques. Unlike the single user situation, there are two major sources of interference in the multiple access transmission system: one is multiple access interference (MAI) and the other is multipath interference (MI). The former occurs due to the cross correlation of CDMA codes and the latter is caused by the combined effect of out-of-phase autocorrelation and cross correlation of spreading codes used by the system in a multipath channel. The performance of the SESS based CDMA with two major impairing effects will be discussed in this dissertation.
Author: Kun Hua Publisher: LAP Lambert Academic Publishing ISBN: 9783846536094 Category : Languages : en Pages : 132
Book Description
The main theme of this research is to improve data quality and security, optimize wireless networking system performance over wireless networks. concerned a novel self-encoded spread spectrum (SESS) network. It provides a feasible practical implementation for random spreading codes. The traditional transmit and receive PN code generators are not needed. Instead, the spreading codes are extracted from the user's information bits itself. Comparing to conventional CDMA, SESS completely abandons the use of pseudo-random spreading codes. The code variability doesn't depend on the spreading length like pseudo-random codes. SESS can achieve 3dB performance gain comparing to the conventional uncoded direct sequence spread spectrum system. The author considers initial acquisition as a global optimization problem and employ genetic search algorithm for converging to the global optimization efficiently. In the tracking phase, Markov chain analysis is used to examine the mean tracking time. SESS is incorporated with cooperative diversity (CD) technique (SESS-CD) to achieve spatial diversity gain with the number of relays.It's stability in highly correlated rayleigh channels has been observed.
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: Liang Chi
Author: Liang Chi
Author: Youn Seok Kim
Author: Kun Hua
Author: Kun Hua
Author: Poomathi Duraisamy
Author: Casey L. Deyle
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Author: Marvin K. Simon
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