Analysis of coded OFDM system over frequency-selective fading channels

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dc.contributorMiller, Scott L.
dc.creatorZheng, Jun
dc.date.accessioned2004-11-15T19:47:29Z
dc.date.accessioned2017-04-07T19:48:57Z
dc.date.available2004-11-15T19:47:29Z
dc.date.available2017-04-07T19:48:57Z
dc.date.created2003-08
dc.date.issued2004-11-15
dc.description.abstractThis thesis considers the analysis of system performance and resource allocation for a coded OFDM system over frequency selective fading channels. Due to the inseparable role taken by channel coding in a coded OFDM system, an information theoretical analysis is carried out and taken as the basis for the system performance and throughput. Based on the results of the information theoretical analysis, the optimal system BER performance of a coded OFDM system is first shown to converge to the outage probability for large OFDM block lengths. Instead of evaluating the outage probability numerically, we provide in this thesis a simple analytical closed form approximation of the outage probability for a coded OFDM system over frequency selective quasi-static fading channels. Simulation results of the turbo-coded OFDM systems further confirm the approximation of the outage probability. By taking the instantaneous channel capacity as the analytical building block, system throughput of a coded OFDM system is then provided. With the aim to compare the performance difference between adaptive and uniform resource allocation strategies, the system throughput of different allocation schemes under various channel conditions is analyzed. First, it is demonstrated that adaptive power allocation over OFDM sub-carriers at the transmitter achieves very little gain in terms of throughput over a uniform power distribution scheme. Theoretical analysis is then provided of the throughput increase of adaptive-rate schemes compared with fixed-rate schemes under various situations. Two practical OFDM systems implementing rate-compatible-punctured-turbo-code-based (RCPT-based) hybrid automatic-repeat-request (Hybrid-ARQ) and redundancy incremental Hybrid-ARQ protocols are also provided to verify the analytical results.
dc.identifier.urihttp://hdl.handle.net/1969.1/1137
dc.language.isoen_US
dc.publisherTexas A&M University
dc.subjectOFDM
dc.subjectCoded OFDM
dc.subjectFading
dc.subjectPerformance Analysis
dc.subjectPower and Rate Allocation
dc.subjectHybrid-ARQ
dc.subjectRedundancy Incremental Hybrid-ARQ
dc.titleAnalysis of coded OFDM system over frequency-selective fading channels
dc.typeThesis

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