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文中提出了新的采用准相干解调算法的卷积编码GMSK信号调制方案和串行迭代译码方案。采用迭代信道估计算法时,新方案可以获得优良的误码率BER性能,同时具有不需要恢复相干载波和位同步简单等优点,非常适宜工程实现。在AWGN信道下,采用迭代信道估计算法时新方案的误码率BER性能与相干解调串行迭代译码的BER性能相差不大。在误码率Pe=10-3且进行2次硬判决迭代信道估计时,新方案与差分解调串行迭代译码相比,性能改善在AWGN信道、轻遮蔽衰落信道和一般遮蔽衰落信道中约为4.1 dB、4.2 dB和4.1 dB。
In this paper, a new convolution-coded GMSK signal modulation scheme and a serial iterative decoding scheme using quasi-coherent demodulation algorithm are proposed. When adopting the iterative channel estimation algorithm, the new scheme can obtain excellent BER BER performance, and has the advantages of not needing to recover coherent carrier and simple bit synchronization, and is very suitable for engineering implementation. Under the AWGN channel, BER performance of the new scheme when using the iterative channel estimation algorithm is not significantly different from that of the coherent demodulation serial iterative decoding. When the bit error rate Pe = 10-3 and two hard decision iterative channel estimations are performed, the performance of the new scheme is better than that of differential demodulation serial iterative decoding in AWGN channel, light shaded fading channel and normal shaded fading channel About 4.1 dB, 4.2 dB and 4.1 dB.