自适应编码和调制(ACM)技术提高FSO链路的性能

2016 IEEE First International Conference on Control, Measurement and Instrumentation (CMI) Pub Date : 1900-01-01 DOI:10.1109/CMI.2016.7413709

Anshul Jaiswal, V. Jain, Subrat Kar

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引用次数: 10

摘要

大气湍流是影响自由空间光学链路性能的主要因素之一。湍流表现为误码率(BER)的增加，导致链路性能下降。自适应编码和调制(ACM)技术用于减轻这种影响。该技术是一种基于信道状态信息(Channel State Information, CSI)调整调制方案、码率等传输参数的自适应传输方案。本文考虑了低湍流条件下的对数正态通道模型。考虑了三种自适应传输方案，即可变数据速率、可变调制方案和可变编码速率。整个工作都是在MATLAB中进行的。当使用可变数据速率自适应方案时，我们可以看到FSO链路性能在平均传输数据速率方面的改善。采用另外两种自适应方案时，可以观察到光谱效率的提高。给出了三种方案的自适应发射机设计，并确定了射频反馈信道的数据速率。

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Adaptive coding and modulation (ACM) technique for performance enhancement of FSO Link

One of the major factors which degrades the Free Space Optics (FSO) link performance is the atmospheric turbulence. Turbulence manifests in increased Bit Error Rate (BER) leading to degradation in the link performance. Adaptive Coding and Modulation (ACM) technique is used to mitigate this effect. This technique is an adaptive transmission scheme wherein transmission parameters such as modulation scheme, code rate, etc., are adjusted based on Channel State Information (CSI). In this paper, we have considered lognormal channel model in low turbulence conditions. Three adaptive transmission schemes viz., variable data rate, variable modulation schemes and variable coding rate are considered. The entire work has been carried out in MATLAB. We see improvement in FSO link performance in terms of average transmitted data rate when variable data rate adaptation scheme is used. Improvement in spectral efficiency is observed when the other two adaptation schemes are used. Design of adaptive transmitter for all the three schemes is presented and data rate of RF feedback channel is determined.

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2016 IEEE First International Conference on Control, Measurement and Instrumentation (CMI)

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