Title :
Coding and decoding of punctured QAM trellis codes
Author :
Chan, François ; Haccoun, David
Author_Institution :
Dept. of Electr. & Comput. Sci., Ecole Polytech. de Montreal, Que., Canada
Abstract :
Punctured convolutional codes allow an easy implementation of variable-rate encoders/decoders. In this paper, the puncturing technique is used to generate new QAM trellis codes from a rate-1/2 code. These codes are true high-rate codes, without parallel branches in the trellis. A simplified decoding technique is also presented. It is shown that the advantages the puncturing technique provides with binary convolutional codes are essentially maintained with trellis-coded modulation
Keywords :
convolutional codes; decoding; quadrature amplitude modulation; trellis coded modulation; trellis codes; variable rate codes; QAM trellis codes; binary convolutional codes; coding; decoding; high-rate codes; punctured convolutional codes; rate-1/2 code; variable-rate encoders/decoders; Bandwidth; Constellation diagram; Convolutional codes; Councils; Decoding; Euclidean distance; Modulation coding; Quadrature amplitude modulation; Quadrature phase shift keying; Viterbi algorithm;
Conference_Titel :
Information Theory, 1995. Proceedings., 1995 IEEE International Symposium on
Conference_Location :
Whistler, BC
Print_ISBN :
0-7803-2453-6
DOI :
10.1109/ISIT.1995.531163
