摘要
16幅度相位联合调制(Amplitude phase shift keying,APSK)经过卫星信道时容易产生码间串扰,解译前需要均衡补偿。传统接收的均衡、解调和译码是分别进行的,本文将Wiener均衡应用于比特交织编码调制(Bit interleaved coded modulation,BICM)卫星系统,并提出一种基于有记忆非线性卫星信道的16APSK联合处理算法。该算法通过联合软判决反馈译码、迭代Wiener均衡及似然信息加权处理,充分挖掘了信息之间潜在的关联性,实现了均衡、解调和译码的多层次联合处理,从而对16APSK的非线性失真进行补偿。仿真验证了算法的有效性,且相比传统接收获得了更好的性能。
To compensate the ISI of 16 amplitude phase shift keying （APSK） over satellite channels, equalization is needed before demodulation and decoding. Conventional receivers exe- cute equalization, demodulation and decoding independently. This paper applies Wiener equali- zation to bit interleaved coded modulation （BICM） satellite system and proposes an associated processing algorithm for 16APSK over memory non-linearity satellite channels. The algorithm joins soft-decision feedback decoding, iterative Wiener equalization and weighting likelihood in- formation together, which deeply excavates the inherent relevance between information. Therefore, an associated processing among equalization, demodulation and decoding is achieved to compensate the nonlinear distortion of 16APSK. Simulation results show that the algorithm is valid with better performance.
出处
《数据采集与处理》
CSCD
北大核心
2013年第6期823-827,共5页
Journal of Data Acquisition and Processing
基金
国家重大科技专项(2009ZX03003-005-01)资助项目
关键词
卫星信道
非线性
均衡
联合
Satellite channels
non-linearity
equalization
association
