Adaptive Coding Rate Trellis-Coded 8PSK System


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A   No.7   pp.1190-1195
Publication Date: 1997/07/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Information Network)
adaptive modulation,  trellis coding,  PSK,  error correction,  

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This paper presents an adaptive coding rate trellis-coded octal phase-shift keying system with rates of 1/3, 1/2, 2/3, and 5/6, under the restriction of a constant transmission bit rate, where the ratio between the informaion bits and error-correcting redundant bits varies according to channel conditions. This system has the advantage of using a simple modem configuration. Because it has no need to change modulation type, transmitter/receiver filters, and clock and carrier recovery circuits, and it can use a convenient Read-Only-Memory table encoder. As for code design, the trellis structures and its signal assignments for rates of 1/3, 1/2, and 5/6 are proposed and investigated, and their BER performances are estimated. As a result, when the system requirement is to keep the bit error rate of 10-4, this system can operate at the lower Eb/No value of 1.5dB on the reduction of transmitting information bits.