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首页> 外文期刊>Wireless Communications Letters, IEEE >On the Performance of Alamouti Scheme in Gamma-Gamma Fading FSO Links With Pointing Errors
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On the Performance of Alamouti Scheme in Gamma-Gamma Fading FSO Links With Pointing Errors

机译：关于Alamouti方案在具有指向错误的Gamma-Gamma衰落FSO链路中的性能

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摘要

The error performance of the free space optical (FSO) link suffers from the atmospheric turbulence. By employing an additional transmit aperture at the transmitter along with Alamouti code, the error rate of the FSO communication system can be significantly improved. However, the pointing errors, generated because of the building sway, has the potential to eradicate the benefits of the Alamouti scheme. Therefore, for a general and realistic study of the FSO based Alamouti scheme, the effect of in the Gamma-Gamma fading atmospheric fluctuations is considered in this paper. Specifically, we derive the symbol error rate and the average capacity of the Alamouti scheme over the Gamma-Gamma fading FSO links with pointing errors. The moment generating function (MGF) of the scheme is derived in terms of the Meijer-G function. An MGF based approach is used to derive the ergodic capacity of the scheme. The effect of pointing errors over the performance of the scheme is analyzed under different scenarios and it is observed that the pointing errors significantly degrade the diversity of the considered FSO system.
机译：自由空间光学（FSO）链路的错误性能会受到大气湍流的影响。通过在发射机处采用附加的发射孔径以及Alamouti码，可以显着改善FSO通信系统的错误率。但是，由于建筑物摇摆而产生的指向错误有可能消除Alamouti方案的好处。因此，对于基于FSO的Alamouti方案的一般性和现实性研究，本文考虑了Gamma-Gamma衰落中大气波动的影响。具体来说，我们推导了具有指向错误的Gamma-Gamma衰落FSO链路上的符号错误率和Alamouti方案的平均容量。该方案的力矩产生函数（MGF）是根据Meijer-G函数得出的。基于MGF的方法用于推导方案的遍历能力。在不同的情况下分析了指向错误对方案性能的影响，并且观察到指向错误显着降低了所考虑的FSO系统的多样性。

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