结合软判决译码的非冗余纠错差分解调的应用

提出了结合软判决译码的非冗余纠错（nonredundant error correction）在差分解调中的应用。用非冗余纠错差分解调的硬判决信息对差分解调软输出进行加权，从而将基于硬判决的非冗余错成功地用于软判决时的差分解调，提高了传统的差分解调结合软判决译码的性能。计算机仿真表明，相对于传统的差分解调结合软判决译码，该算法在AWGN信道中误比特率BER为10^-5时大约有1.4dB的性能改善，在Rician信道中也同样有显著的性能改善，这使得非冗余纠错能够在普遍采用差分解调结合软判决译码的卫星通信系统中应用，显著地提高了系统容量和通信质量。

Nonredundant Error Correction Differential Demodulation Combined with Soft-decision Decoding

The paper proposes the application of nonredundant error correction in differential demodulation combined with soft-decision decoding. According to the hard-decision information of nonredundant error correction, the soft output of conventional differential demodulation is weighted. Thus nonredundant error correction can be used in a system in which the differential demodulation is combined with soft-decision decoding. The algorithm improves the performance of system. Computer simulation shows that the improved performance of the proposed algorithm is superior to the conventional differential demodulation combined with soft-decision decoding by 1.4dB at a BER of 10 -5 in AWGN channel. In Rician channel there is the same notable performance improvements. It enables nonredundant error correction to be used in the system of differential demodulation combined with soft-decision decoding which is widely used in satellite communication system. The system's capacity and communication quality is notably improved.