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The Effect of Metric Modification on the Performance of TCM and Concatenated Systems Over Rayleigh Fading Channels

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Abstract

The performance improvement of conventional TCM schemes over frequency nonselective slow Rayleigh fading channels, caused by a slight modification on the metric calculation of the Viterbi decoder, is investigated in this paper. A statistical analysis of the Euclidean distances at the input of the Viterbi decoder is carried out to explain this improvement. Furthermore, the performance improvement of two concatenated coding systems incorporating the above modification, under the same conditions, is studied. The performance of the TCM and the concatenated systems is evaluated by Monte Carlo simulation. The results show that the examined systems, using the proposed modification on the metric calculation, achieve BER performances comparable to other codes and systems, especially designed for fading channels.

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Authors and Affiliations

  1. Dept. Electrical Engineering and Computer Engineering. Telecommunications Division, Aristotle University of Thessaloniki, 540 06, Thessaloniki, Greece

    I. K. Nissopoulos, C. E. Dimakis & S. S. Kouris

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  1. I. K. Nissopoulos
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  2. C. E. Dimakis
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  3. S. S. Kouris
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Nissopoulos, I.K., Dimakis, C.E. & Kouris, S.S. The Effect of Metric Modification on the Performance of TCM and Concatenated Systems Over Rayleigh Fading Channels. International Journal of Wireless Information Networks 7, 167–175 (2000). https://doi.org/10.1023/A:1009593612908

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