摘要
8PSK、16APSK和32APSK是DVB-S2标准中常用的信号调制方式,采用这些高阶调制方式可以充分提高频谱利用率。而在与高效编译码结合时(如LDPC、TPC等),为了提高误码性能,接收端译码往往需要用到接收信号的软信息。以文献[2]为基础,根据信号模型提出了一种新颖实用的软解映射方法。计算机仿真结果表明:在高斯信道中,新的计算方法与利用Max-log-map方法得到的误码性能几乎相同,但计算复杂度更低,更易于工程实现。
8PSK,16APSK and 32APSK,which are adopted recently in DVB-S2,can increase spectral efficiency.In order to improve BER performance,soft decision is needed in the decoder.Based on literature [2],an implementation of demapping method for 8PSK、16APSK and 32APSK modulation is proposed,which reduces the computational complexity and can be realized easily.The performance simulations reveal that this simplified demapping scheme does not cause any penalty on performance and retains same BER as max-log-map algorithm.
出处
《无线电工程》
2011年第4期45-48,共4页
Radio Engineering
