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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。
The main problem faced by the Free Space Optical-Orthogonal Frequency Division Multiplexing (FSO-OFDM) system is the signal distortion caused by high PAPR. The Selected Mapping (SLM) algorithm can effectively solve the problem of peak-to-average ratio in the FSO-OFDM system. At present, the research of peak-to-average ratio suppression algorithm mainly focuses on the theoretical aspects, and mainly focuses on reducing the peak-to-average ratio at the originating end. However, few studies have applied it to the actual channel transmission. Therefore, the specific implementation of the PAPR suppression algorithm in the FSO-OFDM system, especially the method of actual verification at the receiving end, is of great significance. In this paper, the anti-noise performance of FSO-OFDM system is verified by simulation channel transmission and hardware experiments, and the SLM algorithm is verified to be effective in practical application. The experimental results also lay the foundation for the follow-up study to reduce PAPR The experimental basis.