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Document Type : Latin Dissertation
Language of Document : English
Record Number : 149445
Doc. No : ET21237
Main Entry : Tarik K Ghanim
Title Proper : Analysis of Hybrid-ARQ Based Relaying Protocols under Modulation Constraints
Note : This document is digital این مدرک بصورت الکترونیکی می باشد
Abstract : In a seminal paper published in 2001, Caire and Tuninetti derived an information theoreticbound on the throughput of hybrid-ARQ in the presence of block fading. However, theresults placed no constraints on the modulation used, and therefore the input to the channelwas Gaussian. The purpose of this thesis is to investigate the impact of modulation con-straints on the throughput of hybrid-ARQ in a block fading environment. First, we considerthe impact of modulation constraints on information outage probability for a block fadingchannel with a طxed length codeword. Then, we consider the eض‍ect of modulation constraintsupon the throughput of hybrid-ARQ, where the rate of the codeword varies depending on theinstantaneous channel conditions. These theoretical bounds are compared against the simu-lated performance of HSDPA, a newly standardized hybrid-ARQ protocol that uses QPSKand 16-QAM bit interleaved turbo-coded modulation. The results indicate how much of thediض‍erence between HSDPA and the previous unconstrained modulation bound is due to theuse of the turbo-code and how much is due to the modulation constraints. The same analysisis carried out on systems using hybrid-ARQ in practical relay networks as discussed by apaper by Zhao and Valenti that was published in 2005, where retransmissions can occur fromrelays that have overheard the source and decoded the message successfully. Then agai.
Subject : Electericl tess
: برق
electronic file name : TL44391.pdf
Title and statement of responsibility and : Analysis of Hybrid-ARQ Based Relaying Protocols under Modulation Constraints [Thesis]
 
 
 
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