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将双头脉冲间隔调制(DH-PIM)和最小均方(LMS)算法信道均衡技术应用于自由空间光通信,建立了基于DH-PIM和LMS信道均衡的自由空间光(FSO)通信系统的数学模型,研究了DH-PIM的符号结构、平均功率需求及其功率谱,并且与开关键控(OOK)、脉冲位置调制(PPM)等调制方式作了比较,对系统的性能指标进行了仿真.数学分析和仿真结果表明:该方法可以减小系统的误码率,降低系统发射光功率的需求,特别是在多径弥散信道、高速率和高吞吐量的情况下,效果更加明显.
The DH-PIM and LMS channel equalization techniques are applied to free-space optical communication, and the mathematics of free space optical (FSO) communication system based on DH-PIM and LMS channel equalization Model, the symbol structure, average power requirement and power spectrum of DH-PIM are studied. Compared with OOK and PPM, the performance of the system is simulated. The results of mathematical analysis and simulation show that this method can reduce the bit error rate of the system and reduce the requirement of system transmitting optical power, especially in the case of multipath dispersion channel, high rate and high throughput.