基于OQPSK调制的FSO系统性能探究

Performance of FSO system based on OQPSK modulation

在QPSK调制和解调的基础上,研究和分析了OQPSK(偏移正交相移键控)格式调制和解调原理,深入研究了基于OQPSK格式的自由空间光通信(FSO)系统性能,采用马赫增德尔调制器(MZM)实现光OQPSK调制和相干解调结构的设计。在新型光学软件平台上,搭建光OQPSK的光通信系统并实现系统仿真。由仿真结果可以看出:OQPSK光通信系统性能优于QPSK光通信系统,更适合长距离传输的要求。

In the paper, the modulation and demodulation principle of 0QPSK （offset positive photograph shift keying） format has studies and analyzes based on the QPSK modulation. And the free space optical communication （FS0） system performance based on 0QPSK format has depthly studied. And the structural of optical 0QPSK modulation has desigened using MZM and coherent demodulation. On the new type of optical software platform, the optical OQPSK communication system has designed and the system simulation has realized. As can be seen from the simulation results, 0QPSK optical communication system performance is better than that of QPSK communication system, it is more suitable for long distance transport requirements. Therefore, OQPSK format can be applied and FSO system.