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研究了中强大气湍流条件下基于零判决门限差分探测(DDTZ)的自由空间光(FSO)通信系统误码率性能。在两束传输光完全相关和完全不相关的情况下,推导了DDTZ FSO通信系统和具有最佳阈值的差分探测系统的平均误码率的计算表达式。仿真结果表明:DDTZ不存在传统固定判决门限单端探测(SDTF)中存在的差错平底问题;两个接收信号的相关性对DDTZ误码率没有影响;DDTZ误码率性能虽不及最优差分探测,但明显优于SDTF,因此在可实现性和误码率性能方面,DDTZ更具实际应用价值。
The bit error rate (BER) performance of a free space optical (FSO) communication system based on zero-decision threshold differential detection (DDTZ) under medium-strong turbulent flow conditions is studied. When the two beams of light are completely and completely uncorrelated, the expression of the average bit error rate of the DDTZ FSO communication system and the differential detection system with the best threshold is deduced. The simulation results show that DDTZ does not have the error flatness problem existing in traditional fixed decision threshold single-ended detection (SDTF). The correlation between the two received signals has no effect on the bit error rate of DDTZ. Although the performance of DDTZ bit error rate is not as good as that of optimal differential detection , But it is obviously superior to SDTF, so DDTZ is more practical in terms of realizable and bit error rate performance.