Performance analysis of Free Space Optical links encoded using Luby Transform codes

2012 International Conference on Communication, Information & Computing Technology (ICCICT) Pub Date : 2012-12-31 DOI:10.1109/ICCICT.2012.6398133

G. Prakash, M. Kulkarni, U. Sripati, M. N. Kalyanpur

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引用次数: 4

Abstract

Free Space Optical (FSO) communication is an emerging transmission technique to transmit high data rates without using cables. This technology is expected to revolutionize the present communication system architectures both in the terrestrial and the in -space architecture. Atmospheric effects can significantly degrade the performance of FSO systems. This reduces the SNR and leads to impaired performance. FSO channels can be modeled using Gamma-Gamma, Weibull, Log-Normal, K distribution functions. Error control codes can help to mitigate atmospheric turbulence induced signal fading in free space optical communication links. Luby Transform codes belong to a class of error control codes called Fountain codes and are meant for erasure channels. In this paper, we propose encoding FSO links with Luby Transform (LT) codes for error channels. Decoding is done using belief propagation with Log Likelihood Ratio and results are obtained for different modulation schemes under different channel distributions.

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使用Luby变换编码的自由空间光链路的性能分析

自由空间光通信(FSO)是一种新兴的传输技术，可以在不使用电缆的情况下传输高速率的数据。该技术有望彻底改变现有的地面和空间通信系统体系结构。大气效应会显著降低FSO系统的性能。这降低了信噪比，导致性能受损。FSO信道可以使用Gamma-Gamma、Weibull、Log-Normal、K分布函数进行建模。错误控制码可以帮助减轻大气湍流引起的信号衰落在自由空间光通信链路。Luby变换码属于一类错误控制码，称为喷泉码，用于擦除通道。在本文中，我们提出了用Luby变换(LT)编码错误信道的FSO链路。利用对数似然比的信念传播进行解码，得到了不同信道分布下不同调制方案的解码结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 International Conference on Communication, Information & Computing Technology (ICCICT)

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