TCM without constellation expansion penalty

Author

Kaminsky, Edit J. ; Ayo, James ; Cartwright, Kenneth V.

Author_Institution

Department of Electrical Engineering, University of New Orleans, New Orleans, LA 70148, U.S.A

Volume

4

Issue

2

fYear

2002

fDate

6/1/2002 12:00:00 AM

Firstpage

90

Lastpage

96

Abstract

We present a family of constant-amplitude constellations of even dimensions 8 and above. These constellations allow trellis coded modulation to be implemented without the usual penalty paid for constellation expansion. The new constellations are generated by concatenating either n QPSK points or n QPSK points rotated by 45 degrees, for any n > 4. Our constellations double the number of points available for transmission without decreasing the distance between points and without increasing the average or peak energies, introducing asymmetry, or increasing the modulation level. Effective gains of 2.65 dB with minimum complexity through 6.42 dB with moderate complexity are demonstrated using the 8D constellation.

Keywords

Complexity theory; Convolutional codes; Decoding; Gain; Phase shift keying; Redundancy; Viterbi algorithm; Trellis coded modulation; constant amplitude; constellation expansion; multidimensional constellation; spherical codes;

fLanguage

English

Journal_Title

Communications and Networks, Journal of

Publisher

ieee

ISSN

1229-2370

Type

jour

DOI

10.1109/JCN.2002.6596899

Filename

6596899