弱湍流环境下基于OFDM的大气激光通信系统性能分析

摘要

Atmospheric laser communication attracts much attention as a new wireless access technology,but the turbu-lence effect in atmosphere will make the system channel unstable and affect the transmission performance. In order to sufficiently exploit the potentials of atmospheric laser communication to improve the transmission rate and the perfor-mance of the system,combine the OFDM technology with atmospheric laser communication and establish the simulation model of OFDM system, analyze the impact of different subcarrier modulation methods, different number of subcarri-ers and different cyclic prefix lengths on BER performance of OFDM system under weak turbulence environment, pro-vide the reasonable parameter selection basis for the application of OFDM in atmospheric laser communication system.%大气激光通信作为一种新型无线接入方式备受关注，但是大气中存在的湍流效应会使系统信道不稳定，对传输性能产生影响。为了充分发挥大气激光通信的优势，提高传输速率，改善系统性能，将OFDM技术与大气激光通信相结合并建立OFDM系统仿真模型，分析在弱湍流环境下不同子载波调制方式、不同子载波数以及不同循环前缀长度等因素对OFDM系统误码性能的影响，为OFDM在大气激光通信系统中的应用提供了合理的参数选择依据。