A modified design of trellis-coded MPSK for the fading channel

It is shown that the classical additive white Gaussian noise (AWGN) channel design can be retained for the fading channel with any degree of fading, if carried out with the appropriate signal set size M=M/sub min/. The size of the signal set M/sub min/ is shown to depend upon the number of parallel...

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Veröffentlicht in:IEEE transactions on communications 1993-06, Vol.41 (6), p.874-882
Hauptverfasser: Periyalwar, S.S., Fleisher, S.H.
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description It is shown that the classical additive white Gaussian noise (AWGN) channel design can be retained for the fading channel with any degree of fading, if carried out with the appropriate signal set size M=M/sub min/. The size of the signal set M/sub min/ is shown to depend upon the number of parallel transitions between a given pair of states and the throughput rate. In the proposed multiple trellis-coded modulation (MTCM) scheme with a modified design (MTCM (MD)), the output bits from a rate m/m+1 trellis encoder are assigned multiple signals from an M/sub min/-PSK signal set. Compared to the MTCM with set partitioning proposed for the fading channel (SPF) design, the MTCM (MD) scheme provides the same signal diversity and the same or increased values of the branch distance product, and always leads to increased value of d/sup 2/(free). As a result, the performance is always improved on the Rician fading channel due to the increased d/sup 2/(free), and is improved on any fading channel when an increase in branch distance produce P takes place. When compared to the MTCM with the set partitioning optimum for the AWGN channel (SPA) design, the MTCM (MD) scheme, under certain conditions, provides the same value of d/sup 2/(free) as the MTCM (SPA) design, and is then asymptotically optimum for both the AWGN channel and the fading channels.< >
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When compared to the MTCM with the set partitioning optimum for the AWGN channel (SPA) design, the MTCM (MD) scheme, under certain conditions, provides the same value of d/sup 2/(free) as the MTCM (SPA) design, and is then asymptotically optimum for both the AWGN channel and the fading channels.&lt; &gt;</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/26.231910</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects Applied sciences
AWGN channels
Data communication
Exact sciences and technology
Fading
Information, signal and communications theory
Modems
Modulation coding
Modulation, demodulation
Performance gain
Rayleigh channels
Rician channels
Signal and communications theory
Signal design
Telecommunications and information theory
Throughput
title A modified design of trellis-coded MPSK for the fading channel
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