摘要
分析了在Gamma-Gamma分布信道模型下采用强度调制/直接检测方式的多输入多输出FSO系统模型,在信道为独立同分布和独立不同分布两种情况下,分别推导出单发单收、多发单收和单发多收FSO系统的平均误码率计算公式,其近似封闭解形式用Meije′rs G函数表示出来,并仿真分析了三者的平均误码率性能,结果表明:在Gamma-Gamma分布模型下,当闪烁强度为1.2、信噪比为45 dB时,系统误码率为K分布的1/5;当平均误码率为10-4时,采用4个发射天线的多发单收系统性能比单发单收系统提高了近60 dB;当平均误码率为10-5时,采用3个接收天线的单发多收系统性能比单发单收系统提高了近50 dB,这对无线光多发多收通信系统的理论分析和系统设计具有一定的指导意义。
The MIMO- FSO system model is analysed based on the Gamma-Gamma distribution channels with IM/DD（Intensity Modulation/Direct Demodulation）, under the cases of independent with identical distribution and independent with different distributions, the average error rates of SISO - FSO, MISO - FSO and SIMO - FSO systems are derived with the approximate closed form expressed by Meijer＇s G function, and the average bit error rate（BER） performances are simulated respectively. Simulation results show that： under Gamma-Gamma distribution;when SI and SNR are equal to 1.2 and 45 dB respectively, system＇s average BER is one fifth of K distribution;when the average BER is 10-4, the performance of MISO- FSO system with 4 transmitting antennas is improved about 60 dB; when BER is 10- 5, the performance of SIMO - FSO system with 3 receiving antennas is improved about 50 dB, which is meaningful to analyse and design MIMO - FSO systems.
出处
《电讯技术》
北大核心
2011年第9期117-122,共6页
Telecommunication Engineering
