The Combined MSDD Iterative Demodulator Based on SIHO Decoding Algorithm

A new combined MSDD iterative differential demodulation and channel decoding algorithm based on Soft-Input Hard-Output(SIHO) Viterbi decoding algorithm is presented. The new algorithm includes feed-forward iteration method and feed-backward iteration method. Numerous simulation results show that the proposed feed-backward iteration method can get performance only worsen than QPSK corherent demodulation is 1.1dB. Test results of satellite communication demodulator based on FPGA show that the performance only worsen than simulation results about 0.5dB.