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自由空间光通信(FSO)系统是一种新型的宽带接入系统,结合了光纤通信与微波通信的优点。但是FSO系统容易受到环境和天气状态的影响,把多输入多输出(MIMO)技术应用于FSO系统中可以有效改善大气对激光波束的影响,提高系统性能。文中主要研究了FSO-MIMO系统的空时译码问题,结合传统的一些译码算法,把Turbo码的迭代译码思想应用于FSO MIMO的空时译码中,分析了一种基于马尔科夫链蒙特卡洛(MCMC)算法的迭代译码方法。
Free space optical communications (FSO) system is a new type of broadband access system that combines the advantages of optical fiber and microwave communications. However, the FSO system is easily affected by the environment and weather conditions. The application of multiple-input multiple-output (MIMO) technology in the FSO system can effectively improve the influence of the atmosphere on the laser beam and improve the system performance. In this paper, the space-time decoding of FSO-MIMO system is mainly studied. Combining with some traditional decoding algorithms, the idea of iterative decoding of Turbo codes is applied to space-time decoding of FSO MIMO. Iterative decoding method of chain Monte Carlo (MCMC) algorithm.