Performance Analysis of RoFSO Links with Diversity Reception for Transmission of OFDM Signals Under Correlated Log-normal Fading Channels

J. ICT Stand. Pub Date : 2014-12-31 DOI:10.13052/JICTS2245-800X.224

Fan Bai, Yuwei Su, Takuro Sato

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引用次数: 8

Abstract

Freespaceoptical(FSO)communicationhasbeenreceivinggrowingattention with recent commercialization successes as a cost-effective and high bandwidth optical access technique. Meanwhile, FSO communication has been regard as an attractive solution to bridging the gap between the wireless communications and optical fiber communications. However, a significant performance degradation in FSO communication system due to the atmospheric turbulence impairs the transmission performance improvement. FSO system employing the spatial diversity technique can be used to mitigate the effect of turbulence and improve the transmission performance. In this paper, a novel analytical approach is presented to evaluate the transmission performance of OFDM-FSO system with diversity reception considering effect of channel correlation.Adetailed mathematical model for OFDM-FSO system over turbulent channel modeled by correlated Log-normal distribution is provided. Then, We derive the signal-to-noise ratio (SNR), bit error ratio (BER) and outage probability expressions taking into account the diversity combining schemes (i.e. MRC, EGC), effects of atmospheric turbulence, channel correlation and aperture size of receiver lens. The results of this

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相关对数正态衰落信道下具有分集接收的RoFSO链路传输OFDM信号的性能分析

自由空间光通信(FSO)作为一种具有成本效益和高带宽的光接入技术，随着最近的商业化成功，已经受到越来越多的关注。同时，FSO通信已被认为是一种有吸引力的解决方案，以弥合无线通信和光纤通信之间的差距。然而，由于大气湍流的影响，FSO通信系统的传输性能明显下降，影响了传输性能的提高。采用空间分集技术的FSO系统可以减轻湍流的影响，提高传输性能。本文提出了一种考虑信道相关影响的分集接收OFDM-FSO系统传输性能的分析方法。给出了基于相关对数正态分布的湍流信道OFDM-FSO系统的详细数学模型。然后，我们推导了考虑分集组合方案(即MRC、EGC)、大气湍流影响、信道相关和接收透镜孔径大小的信噪比(SNR)、误码率(BER)和中断概率表达式。结果是

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J. ICT Stand.

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