Title :
Very low rate trellis/Reed-Muller (TRM) codes
Author :
Chaib, Jean-Paul ; Leib, Harry
Author_Institution :
Nortel Networks, St.-Laurent, Que., Canada
fDate :
10/1/1999 12:00:00 AM
Abstract :
This paper considers a technique for very low rate channel coding. The main application for such codes is in spread-spectrum systems where significant bandwidth spreading is possible. New, very low rate binary channel codes based on a combination of a trellis code with a first-order Reed-Muller block code (trellis/Reed-Muller (TRM) codes) are presented. The construction technique for TRM codes, which is considered in this paper, is related to Kerdock (1972) codes. It is shown that these TRM codes provide a better tradeoff between rate and gain than other existing very low rate codes, such as the orthogonal or superorthogonal convolutional codes, and the IS-95 uplink code. Due to their improved performance, TRM codes can significantly increase the bandwidth efficiency of spread-spectrum multiple-access systems
Keywords :
Reed-Muller codes; block codes; cellular radio; channel coding; multi-access systems; radio links; spread spectrum communication; trellis codes; AWGN; IS-95 uplink code; Kerdock codes; SSMA; TRM codes; bandwidth efficiency; bandwidth spreading; binary channel codes; channel coding; code rate; coding gain; first-order Reed-Muller block code; orthogonal convolutional code; performance; spread-spectrum multiple-access systems; superorthogonal convolutional code; trellis code; trellis/Reed-Muller codes; very low rate TRM codes; very low rate codes; AWGN; Bandwidth; Block codes; Channel coding; Convolutional codes; Error correction; Error correction codes; Shift registers; Spread spectrum communication; Transmission line measurements;
Journal_Title :
Communications, IEEE Transactions on
