In this paper, we propose a new Adaptive Cooperation (AC) protocol for Free Space Optical (FSO) communications. Two versions of the protocol are presented. The first protocol uses the Instantaneous Signal to Noise Ratio (ISNR) to activate the relay only when the corresponding instantaneous throughput is better than that of the direct link. The second protocol uses the Average SNR (ASNR) to activate the relay when its average throughput is larger than that of the direct link. The proposed AC protocol has been extended to include Adaptive Modulation and Coding (AMC). Our results are valid for FSO communications in the presence of Gamma Gamma atmospheric turbulence.

在本文中，我们提出了一种用于自由空间光（FSO）通信的新的自适应合作（AC）协议。介绍了该协议的两个版本。仅当相应的瞬时吞吐量比直接链路的瞬时吞吐量更好时，第一种协议才使用瞬时信噪比（ISNR）激活中继。当第二协议的平均吞吐量大于直接链路的平均吞吐量时，它使用平均SNR（ASNR）激活中继。提议的AC协议已扩展为包括自适应调制和编码（AMC）。我们的结果对于存在Gamma Gamma大气湍流的FSO通信是有效的。