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Title:
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Throughput Measures for Delay-constrained Communications in Fading Channels |
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Author:
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Ahmed, Nadeem; Baraniuk, Richard G.
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Type:
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Conference Paper |
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Keywords:
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throughput; fading channels; block fading; outage; capacity |
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Citation:
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N. Ahmed and R. G. Baraniuk,"Throughput Measures for Delay-constrained Communications in Fading Channels," in Allerton Conference on Communication, Control and Computing, |
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Abstract:
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Fading channels, often seen in wireless systems, provide an unfavorable environment for reliable communications. Current methods for evaluating the performance of fading channels include ergodic capacity and epsilon-capacity. Ergodic capacity quantifies the ultimate reliable communication limit of the fading channel. It is only achievable with infinite coding delay, making it impossible to achieve in practice. epsilon-capacity, achievable with finite coding delay, does not provide a measure of error-free communications performance. Since practical communication systems are delay-constrained, it is possible to retransmit codewords when errors occur. We provide a new analysis framework that accounts for codeword retransmission in the analysis of fading channels. We introduce new measures, maximum zero-outage throughput and maximum epsilon-throughput, that predict the performance of practical systems and show that ergodic capacity and epsilon-capacity are special cases of our definitions. We also provide a measure that characterizes the performance of a system with more complex receiver design, using "incremental diversity" to improve throughput. |
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Date Published:
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2003-10-01 |
