一种新的解调译码方案

提出了一种多码元差分检测与软判决译码相结合的解调译码方案。该方案利用差分编码后载波相位之间的相关性,将多阶差分的联合信息用于Viterbi算法,从而实现了多码元检测与Viterbi软判决译码的结合。对该方案进行了计算机仿真,仿真结果表明,在误比特率为10~(-4)时,在AWGN信道中相对于传统的差分检测结合软判决译码,性能提高约1．6dB,在Rician衰落信道中性能同样有明显改善。该方案实现简单。对于功率受限的卫星通信系统,具有重要意义。

A New Demodulation and Decoding Scheme

This paper proposes a demodulation and decoding scheme,which combines multiple symbols differential detection with soft-decision decoding.The scheme makes use of the relativity of the carrier phase after differential encoding,perform the Viterbi algo- rithm with the correlative information of the multiple-order differential phase,to combine multiple symbols differential detection with soft-decision decoding.The scheme is simulated by computer.And the result shows that compared with the traditional differential detec- tion and soft-decision decoding,when the bit error rate is 10~(-4) ,the performance is improved by 1.6dB in the AWGN channel And in the Rician fading channel,there is the same notable performance improvements.The scheme is easy to be realized.As to power-limited satellite communication systems,it is very significant.