CODED MODULATION SYSTEM

This paper proposes and investigates an automatic equalizer applicable to trellis coded modulation, which includes a Viterbi decoder and a carrier-phase controller, in order to achieve reliable high-speed data transmission. The proposed equalizer can carry out appropriate joint operation of equalization, demodulation and decoding. Since the system reduces misadjustment of tap values and estimated carrier-phase shift due to decision errors, stable convergence can be achieved. Moreover, this paper presents a method to utilize the reliability of decoded data In order to minimize misadjustment of the ADFs and the phase controller owing to undetected errors and miscorrected data in decoding.