Development of a Trellis-Coded 8PSK Modem and Its Transmission Performance (Special Issue on Digital Broadcasting Technology)

概要

論文の詳細を見る
A Trellis-Coded 8PSK (TCM) modem has been developed. This modem can transmit HDTV programs at a bit rate of 60 Mbps over a satellite channel. In addition to Trellis coding, the (255,235) Reed-Solomon code is adopted together with an interleaving technique to improve bit error performance. As a result, it has been confirmed that bit error rate of 10^<-10> is achievable at a carrier to noise ratio of around 8.5 dB over a 30 MHz Gaussian noise channel. This TCM modem is also designed to double as a DQPSK modem. We examined the performances of these two modulation methods in a nonlinear channel. It was found that TCM is less disturbed than DQPSK by nonlinear distortion due to TWT. In addition, a limiter amplifier cascaded to TWT improves DQPSK performance and disturbs TCM performance. However it was confirmed that TCM still has a coding gain of 3 dB over DQPSK.
社団法人電子情報通信学会の論文
1994-12-25