New TCM codes for AWGN and ISI channel by matched symbol-mapping method

A new trellis coded modulation (TCM) design method is presented in this paper in order to improve the coding gain for wireless communications through AWGN and intersymbol interference (ISI) channel. In this work, a definition for matching the distribution of received symbol probability to the signal subset construction, called "matched symbol-mapping", is proposed. Several new codes have been constructed at throughput (Rb) of 1, 1.5, 2.5 and 3 bits/sec/Hz. They have been simulated in AWGN, and in multipath Rayleigh fading (ISI) channel with signal equalization by sub-optimum soft output equalizer (SSE), and with pre-equalization by phase precoding. Results show that the proposed method can be used successfully to construct new TCM codes achieving a better performance.