广义自适应OPSK系统的计算机模拟

Computer simulation of generalized adaptive OPSK modulating and demodulating system

论述在OPSK系统的解调与译码间加入一个自适应环节 ,适当旋转信号星座图 ,联合调整和修正分支量及译码回溯路径 ,保留最可能的正确路径 ,淘汰最可能的错误路径 ,从而减少信道噪声的引入对后续译码准确性的影响 ,进一步提高系统的总体性能。给出了系统模型及计算机模拟结果 :广义自适应OPSK系统较广义OPSK系统有 0 2dB的性能改善 ;较未编码OPSK系统约有 3dB的编码增益。

Based on the OPSK modulating and demodulating system,a generalized adaptive link is added between demodulating and decoding. Its decoding operation in the co-designing system is generalized adaptive in the sense that the constellation and the surviving path by which the decoder looking back is all dynamic adjusted. Thus this kind of design improves the total performance of the system. Besides models of the system, the article gives a result of computer simulation.There are 0.2 dB gaining in the generalized adaptive system than in the generalized system,and 3 dB gained than in the OPSK system without coding.