自由空间光通信正交频分复用(Free Space Optical-Orthogonal Frequency Division Multiplexing, FSO-OFDM)系统面对的主要问题是峰均比(PAPR)高而导致的信号失真。而选择性映射(Selected Mapping, SLM)算法可以有效解决FSO-OFDM系统中的峰均比问题。目前, 对峰均比抑制算法的研究还主要集中在理论方面, 而且主要在发端研究降低峰均比的方法, 而很少有文献将其应用于实际的信道传输。所以对FSO-OFDM系统中峰均比抑制算法的具体实现, 尤其是在接收端进行实际验证的方法就显得意义重大。文中通过仿真信道传输和硬件实验都验证了采用SLM算法后FSO-OFDM系统的抗噪声干扰性能增加,并验证了SLM算法应用于实际的有效性, 且该实验结果也为降低PAPR的后续研究奠定了实验基础。

Signal distortion caused by High Peak to Average Power Ratio(PAPR) is the major disadvantages that the Free Space Optical(FSO) Orthogonal Frequency Division Multiplexing(OFDM) system has to deal with, while Selected Mapping algorithm (SLM) can effectively solve this problem. The research on PAPR, however, is mainly focused on theory simulation, and especially on the reduction of PAPR at the transmitter. Therefore, works on the implementation of the algorithm on PAPR reduction in FSO-OFDM system, especially the verified way of reducing PAPR at the receiver, are of significance in literature and practice. It was verified that the performance of FSO-OFDM system on noise immunity can be increased after using the SLM algorithm through simulation, and effective when applied to the channel transmission in hardware experiments. And this experimental results lay the foundation for follow-up studies on the reduction of the PAPR.