基于脉冲激光器特性的调制方案性能研究

Study of Modulation Scheme Performance Based on Characteristics of Pulse Laser

针对脉冲激光器峰值功率大、重复频率低和占空比受限等特性，对现有的无线光通信调制方案进行分析和改进，给出改进后调制方案的符号结构，在功率效率、带宽需求和传输容量等方面对其性能进行分析比较，并在理想的加性高斯白噪声干扰下分析其误包率。理论分析和仿真验证表明：脉冲宽度调制方案具有最大的传输容量，能在适应脉冲激光器特性限制的同时，获得较好的调制性能，在无线光通信系统中有一定的应用前景。

Aiming at the characteristics of pulse laser such as high peak power, low repetition frequency, limited duty cycle and so on, the existing optical wireless communication modulation schemes are analyzed and improved, symbol structure of the improved modulation schemes are given, their performance of average transmission power, bandwidth requirement, and transmission capacity are analyze and compared. Deduce the packet error rate based on the ideal additive white Gaussian noise channel model. Theoretic analysis and simulation show that pulse midth modualation has the largest transmission capacity. If it is used to modulate pulse laser, it can not only overcome the limitations of pulse laser, but also achieve good performance, so it has application mospect in optical wireless communication system to some extent.