A Suitable Combination of Modulation and FEC Schemes for Satellite Digital Video Communication Networks (Special Issue on Satellite Communications Networking and Applications)

概要

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This paper proposes a suitable combination of the digital modulation schemes and the coding-rate of forward error correction (FEC) schemes for satellite digital video communication networks. The comparative study is carried out by computer simulation considering non-linearly amplified, narrow bandwidth satellite channels with adjacent channel interference signals. The proposed system employs an offset QPSK modulation scheme supported by the coding-rate of 7 / 8 convolutional encoding and Viterbi decoding to realize high-quality and compact spectrum characteristics in non-linear channels. By employing a 32 Mbps DPCM video codec, the developed prototype system achieves a post demodulated S / N ratio of higher than 52 dB. Moreover, it achieves high protection ratio against cochannel interference than conventional analog FM systems. The optimized digital video transmission system makes it possible to transmit high-quality NTSC video signals over non-linearly amplified narrow bandwidth satellite channels, for example 27 MHz or 36 MHz bandwidth transponders, with high-security digital encryption.
社団法人電子情報通信学会の論文
1993-05-25