Trellis Coded Modulation Using Totally Overlapped Signal Sets

概要

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In conventional trellis coded modulation (TCM), a bit rate of m/m+1 convolutional encoder is employed for n information bits (m≦n), where 2^<n+1> signal points are required. In this paper, we propose a novel TCM system using totally overlapped signal sets (TO-TCM), i.e., each signal point is used twice. Thus, TO-TCM can realize only half signal points (2^n) comparing with those of a conventional TCM system (2^<n+1>), and it is possible to implement a coded modulation system without doubling the signal points by an insertion of redundant bits. The cases of the proposed schemes which have a process to extend the minimum free distances between the signal points can achieve a considerable coding gain in comparison to the traditional uncoded systems with 2^n signal points. Moreover, as the proposed scheme needs only half signal points (2^n) of those of conventional TCM, the average power is lower and it is less sensitive to the carrier phase offset.
社団法人電子情報通信学会の論文
1993-03-25