Multi-Dimensional Trellis Coded Phase Modulation Using A Multilevel Concatenation Approach

摘要

The first part of this paper presents a simple and systematic technique for constructing multi- dimensional MPSK Trellis Coded Modulation(TCM) codes. The construction is based on a multilevel concatenation approach, in which binary convolutional codes with good free branch distances are used as the outer codes and block MPSK modulation codes arc used as the inner codes ( or the signal spaces ). Conditions on phase invariance of these codes are derived and a multistage decoding scheme for these codes is proposed. The proposed technique can be used to construct good codes for both the AWGN and fading channels as is shown in the second part of this paper.