Improving FSO Link Performance using PolSK Modulation

Douatia Koné, K. A. Kamenan, A. Kamagate
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Abstract

Free Space Optical (FSO) communication systems are based on the use of infrared light to transmit information at high speed through the atmospheric channel. Their performance is therefore affected by the characteristics of the atmospheric channel. One of the most widely used methods of compensating for the effects of atmospheric factors is modulation.The main aim of this research is to demonstrate the improvement in FSO link performance using PolSK modulation in a subtropical environment such as Cˆote d’Ivoire. The performance indicators considered are bit error rate, channel capacity, outage probability and energy efficiency. The mathematical expression of the evolution of each of these indicators as a function of the atmospheric parameters of our environment was determined using the gamma-gamma model. A numerical evaluation of the results obtained was carried out using Matlab software. The results show that PolSK modulation offers the best results in terms of BER reduction, with a BER of the order of 10-11 for an SNR of 50dB, compared with BERs of 10-4 and 10-2 for BPSK and OOK modulations respectively. We obtain a probability of interruption of the order of 10-3 for PolSK modulation compared with 10-2 for BPSK modulation and 10-1 for OOK modulation. As for the channel capacity, we obtain the same value (4:1458bit/s) for PolSK and BPSK modulation compared with 3:8181bit/s for OOK modulation. BPSK modulation, on the other hand, stands out for its excellent energy efficiency.
利用 PolSK 调制改善 FSO 链路性能
自由空间光学(FSO)通信系统是利用红外光通过大气信道高速传输信息。因此,其性能受到大气信道特性的影响。本研究的主要目的是展示在科特迪瓦这样的亚热带环境中使用 PolSK 调制技术对 FSO 链路性能的改善。考虑的性能指标包括误码率、信道容量、中断概率和能效。利用伽马-伽马模型确定了这些指标中每一个指标的演变与我们所处环境的大气参数之间的函数关系的数学表达式。结果表明,PolSK 调制在降低误码率方面效果最佳,信噪比为 50dB 时的误码率为 10-11,而 BPSK 和 OOK 调制的误码率分别为 10-4 和 10-2。PolSK 调制的中断概率为 10-3,而 BPSK 和 OOK 调制的中断概率分别为 10-2 和 10-1。在信道容量方面,PolSK 和 BPSK 调制的信道容量值相同(4:1458bit/s),而 OOK 调制的信道容量值为 3:8181bit/s。另一方面,BPSK 调制因其出色的能效而脱颖而出。
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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