The effect of constellation density on trellis coded modulation in fading channels

Author

Ho, Paul ; Cavers, James ; Varaldi, Jean

Author_Institution

Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada

fYear

1992

fDate

10-13 May 1992

Firstpage

463

Abstract

There has been some reluctance to use dense constellations such as 16 CAM for mobile communications because of their greater peak-to-average-power ratio and their seemingly greater sensitivity to noise and channel interference. It is demonstrated that dense constellations can actually improve performance. Using a completely analytical method, three constellations are compared with the same net throughput of 2 bits/symbol: uncoded QPSK, rate 2/3 TCM 8-PSK, and rate 1/2 TCM 16 QAM. Comparison on the basis of average power puts TCM 16-QAM 5-dB ahead of TCM 8-PSK. Even comparison on the basis of peak power gives TCM 16-QAM a 2.44-dB advantage over TCM 8-PSK. QPSK is much poorer than either

Keywords

amplitude modulation; fading; mobile radio systems; phase shift keying; telecommunication channels; trellis codes; average power; constellation density; dense constellations; fading channels; mobile communications; peak power; rate 1/2 TCM 16 QAM; rate 2/3 TCM 8-PSK; throughput; trellis coded modulation; uncoded QPSK; Fading; Interference; Mobile communication; Modulation coding; Peak to average power ratio; Personal communication networks; Power amplifiers; Quadrature phase shift keying; Rayleigh channels; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1992, IEEE 42nd

Conference_Location

Denver, CO

ISSN

1090-3038

Print_ISBN

0-7803-0673-2

Type

conf

DOI

10.1109/VETEC.1992.245354

Filename

245354