论文部分内容阅读
针对FH/MFSK系统,提出一种MFSK信号的M维软解调能量信息,作为译码器软输入的方法,避免了近似比特对数似然信息(LLR)的计算,并结合卷积码,给出了相应的软译码算法。理论推导了采用该算法的FH/MFSK系统在AWGN和Rayleigh衰落信道下抗PBNJ性能,给出了BER的上界闭合表达式。计算机仿真验证了理论推导的正确性,并与近似比特LLR和硬判决2种译码器输入信息的FH/MFSK系统进行对比,证明该算法获得了明显的抗PBNJ处理增益。
Aiming at the FH / MFSK system, an M-M soft demodulation energy information of MFSK signal is proposed. As a soft input method of decoder, the calculation of approximate bit LLR is avoided. Combined with convolutional code, The corresponding soft decoding algorithm is given. The anti-PBNJ performance of FH / MFSK system using AWGN and Rayleigh fading channel is derived theoretically, and the upper bound of BER is given. Computer simulation verifies the correctness of the theoretical derivation. Compared with the FH / MFSK system which approximates the bit LLR and the hard decision of the two kinds of decoder input information, the simulation results show that the algorithm has obvious anti-PBNJ processing gain.