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提出了一种基于极化码的无线光信道副载波调制方法,给出了极化编译码的具体算法过程,并将其应用于无线光通信系统。在不同大气湍流强度下,对系统的差错性能进行了仿真分析,其中着重对基于极化码的二相相移键控和四相相移键控两种调制方法的误码率进行了对比,结果表明,采用极化码的副载波二相相移键控调制系统的性能优于四相相移键控系统。最后,实验比较分析了极化编码前后副载波调制系统的误比特率,结果表明,在无线光通信大气湍流信道模型下,采用副载波极化码编码调制技术可使误码率性能改善一个量级。
A polarization modulation code-based wireless optical channel subcarrier modulation method is proposed. The specific algorithm of polarization coding and decoding is given and applied to the wireless optical communication system. Under different atmospheric turbulence intensities, the error performance of the system was simulated and analyzed. The error rates of the two modulation methods based on polarization code, such as two phase shift keying and four phase shift keying, were compared. The results show that the performance of subcarrier two-phase shift keying modulation system with polarization code is better than that of four-phase shift keying system. Finally, the bit error rates of the subcarrier modulation system before and after the polarization coding are compared and analyzed experimentally. The results show that using the subcarrier polarization code modulation technique in the wireless optical communication atmospheric turbulence channel model can improve the bit error rate performance by an amount level.