FSO Detection Using Differential Signaling in Outdoor Correlated-Channels Condition
FSO Detection Using Differential Signaling in Outdoor Correlated-Channels Condition
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DOI：
10.1109/lpt.2015.2480011
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发表时间：
2016-01-01
影响因子：
2.6
通讯作者：
Bhatnagar, Manav R.
中科院分区：
文献类型：
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作者：
Abadi, Mojtaba Mansour;Ghassemlooy, Zabih;Bhatnagar, Manav R.
在这封信中，我们介绍了一种基于差分信号方案的室外自由空间光通信检测技术。与传统接收机相比，该方法不需要信道状态信息（CSI），也不存在计算负担，在传统接收机中，动态调整检测阈值水平（基于CSI知识，或使用导频）会导致计算时间增加和链路吞吐量降低。这封信表明，所提出技术的性能仅取决于传播光束的相关性。特别是在高度相关信道条件下，接收机中检测阈值水平的波动非常小。我们还通过实验表明，在弱湍流状态下，相关信道的检测阈值水平方差会减小。
In this letter, we introduce a detection technique based on differential signaling scheme for outdoor free space optical communications. This method requires no channel state information (CSI) and does not suffer from the computational load compared with the conventional receivers, where adjusting dynamically the detection threshold level (either based on CSI knowledge, or by using pilots) leads to increased computational time and reduced link throughput. This letter shows that the performance of the proposed technique only depends on the correlation of propagating optical beams. Especially under highly correlated-channels condition the fluctuation of the detection threshold level in the receiver is significantly small. We also show experimentally that under weak turbulence regime the variance of detection threshold level reduces for the correlated channel.