Abstract This paper evaluates the performance of an energy harvesting based asymmetric radio frequency (RF)/ free space optical (FSO) system with transmit antenna selection (TAS) and received diversity techniques. The source is equipped with multiple transmit antenna and employs TAS to send information to the destination via the relay node. At the same time, the energy-constrained source harvests energy from the relay node through the receive diversity techniques such maximum ratio combining (MRC) and selection combining (SC). Based on this, relay node functions as wireless power transmitting node as well as data receiving node. The RF/FSO channels are subjected to Rayleigh/Malaga (M) distributions with non-zero boresight (NB) pointing error on the FSO link. Thus, the closed-form expression for the concerned system outage probability is then provided. Through this expression, Gaussian–Chebyshev quadrature method is employed to obtained the average bit error rate of the under studied system. The accuracy of the derived expressions is validated through Montel Carlo simulations. At high SNR, the results demonstrate an error floor due to zero diversity order. In addition, the results show that the atmospheric turbulence and NB pointing error significantly affect the system performance with the MRC offers better performance compared to SC.

中文翻译：

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基于无线能量收集的非对称 RF/FSO 系统，具有发射天线选择和 M 分布信道上的接收分集和非零视轴指向误差

摘要 本文通过发射天线选择 (TAS) 和接收分集技术评估基于能量收集的非对称射频 (RF)/自由空间光学 (FSO) 系统的性能。源端配备多个发射天线，并使用 TAS 通过中继节点向目的地发送信息。同时，能量受限源通过最大比合并（MRC）和选择合并（SC）等接收分集技术从中继节点获取能量。基于此，中继节点既可以作为无线电力传输节点，也可以作为数据接收节点。RF/FSO 信道受瑞利/马拉加 (M) 分布的影响，在 FSO 链路上具有非零视轴 (NB) 指向误差。因此，然后提供有关系统中断概率的闭式表达式。通过这个表达式，高斯-切比雪夫正交方法被用来获得被研究系统的平均误码率。派生表达式的准确性通过蒙特卡洛模拟得到验证。在高 SNR 下，结果证明了由于零分集阶数导致的错误本底。此外，结果表明大气湍流和 NB 指向误差显着影响系统性能，与 SC 相比，MRC 提供更好的性能。结果证明了由于零分集阶数导致的错误底线。此外，结果表明大气湍流和 NB 指向误差显着影响系统性能，与 SC 相比，MRC 提供更好的性能。结果证明了由于零分集阶数导致的错误底线。此外，结果表明大气湍流和 NB 指向误差显着影响系统性能，与 SC 相比，MRC 提供更好的性能。