High-order modulations are necessary to improve the bandwidth efficiency of the satellite\ncommunication system. However, the non-linear characteristic of satellite channels limits the\napplication of high-order modulations. In this paper, we propose a new 7-point constellation which\nis expected to be effectively applied to the satellite communication system, and combine it with\nnon-binary low-density parity-check (NB-LDPC) codes over Galois field GF(7) to guarantee the\nreliability of the data transmission. The exact expression for the average symbol error probability\n(SEP) of 7-order quadrature amplitude modulation (7-QAM) over the Additive White Gaussian Noise\n(AWGN) channel is derived, and the non-linear distortion over satellite channels is also analyzed.\nSimulation results reveal that, compared with the traditional 8-order phase-shift keying (8-PSK), the\n7-QAM method can achieve about 3 dB gain over the AWGN channel without channel coding at\nsymbol error rate (SER) of 10-6. Moreover, the proposed combined coded modulation scheme also\nhas better SER performance than the NB-LDPC coded 8-PSK modulation scheme over the non-linear\nsatellite channel.
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