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介绍了湍流信道条件下光强闪烁的对数正态分布模型,结合大气信道特点,在不同光强闪烁效应下,对比分析了几种未编码大气激光通信副载波系统的误码性能。采用Turbo码性能限分析了基于Turbo编码的无线光通信副载波调制系统误码性能,并对Turbo编码前后系统误比特性能进行了对比。仿真结果表明,二进制相移键控(BPSK)误码性能优于其它几种副载波调制,同时Turbo码技术在较强光强闪烁指数下能够获得较大的编码增益,可以有效地提高系统的抗干扰能力。
The logarithm normal distribution model of light intensity flicker under turbulent channel conditions is introduced. Combined with the characteristics of atmospheric channels, the bit error performance of several uncoded submarine laser communication subcarrier systems under different light intensity scintillation effects is compared and analyzed. Turbo codes were used to analyze the bit error performance of the turbo-coded wireless optical subcarrier modulation system and the performance of the system before and after turbo coding was compared. The simulation results show that the BPSK bit error rate performance is superior to other subcarrier modulations, and the Turbo code gain a larger coding gain under the stronger light intensity flicker index, which can effectively improve the system’s Anti-interference ability.