Coding and modulation schemes for slow fading channels

Author

Gagnon, F. ; Haccoun, D.

Author_Institution

Dept. of Electr. Eng., Ecole de Technol. Superieure, Montreal, Que., Canada

Volume

43

Issue

38020

fYear

1995

Firstpage

858

Lastpage

868

Abstract

Two new schemes are presented to improve the error performances of coding and modulation on slow fading channels. The first scheme consists of permuting coordinates of multidimensional modulation and trellis coded modulation (TCM) on interleaved channels. Theoretical and simulation results show that this simple permutation may provide gains of 3.8 dB on slow Rayleigh fading channels for uncoded modulation. It also improves by 5 dB the performance of fully interleaved 16-QAM TCM. The second scheme consists of using coded frequency diversity. Without bandwidth expansion, the signal is spread over different independent fading channels. For two very slow fading channels, where interleaving is impractical and coding usually does not provide any gain, coded diversity and 16-QAM TCM provides gains of 13 dB at a BER of 10/sup -4/.<>

Keywords

Rayleigh channels; coding errors; diversity reception; error statistics; fading; interleaved codes; multidimensional systems; quadrature amplitude modulation; trellis coded modulation; BER; coded frequency diversity; error performance; gain; independent fading channels; interleaved 16-QAM TCM; interleaved channels; multidimensional modulation; permutation; simulation results; slow fading channels; trellis coded modulation; uncoded modulation; Bandwidth; Bit error rate; Fading; Frequency diversity; Gain; Interleaved codes; Modulation coding; Multidimensional systems;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.380118

Filename

380118