基于冲击滤波器的EBPSK软解调研究

Research on EBPSK Soft Demodulation Based on Impact Filter

摘要: 研究了EBPSK信号在冲击滤波器下的软解调的可行性与性能。在EBPSK解调端，一般使用冲击滤波器。由于其非线性以及IIR的特性，所以EBPSK的软解调一直是个难题。本文参照BPSK解调的软解调，在高斯信道下，从理论上给出了其软信息的形式，并将接收端的冲击幅度减去门限的绝对值作为接受信号的可靠性度量，验证了其可行性，并采用Chase-3方案仿真了此软解调方案的性能，结果比硬解调性能提高了0.5 dB左右。

Abstract: This paper researches the possibility and performance of EBPSK soft demodulation based on impact filter. We use impact filter to demodulate EBPSK signals generally. Because of the impact filter’s nonlinear character, it is hard to implement EBPSK soft demodulation. Referring to BPSK soft demodulation in Gaussian channel, this paper puts forward the theoretical soft information formula which is the critical point of soft demodulation, and verifies the rationality of the formula. Chase-3 algorithm is used to simulate this soft demodulation scheme and the simulation results show that soft demodulation scheme increases 0.5 dB compared with hard demodulation.