Performance of concatenated phase precoding and TCM on frequency selective fading channel

In this paper, the concatenated system of phase preceding and trellis coded modulation (TCM) is investigated. Simulations of throughput (Rb) of 2 bits/sec/Hz show that phase precoding gains at BER of 10E-6 by 6.5 dB and 2.5 dB for rate 2/3 8PSK-TCM with four and eight state code respectively, compared to sub-optimum soft output equalization (SSE) at the receiver with the same TCM-codes. This pure precoding is verified on uncoded-QPSK in which more than 30 dB is gained compared to SSE. In addition at Rb of 3, a newly designed multiple-TCM (16PSK-2MTCM, 8 states) with precoding confirms this concatenation system for powerful ISI cancellation by achieving more than 1.5 dB of gain.