BER Analysis of BCH Codes in Slow Fading Channel with L-PPM and DPPM Scheme

Sonali, N. Gupta, A. Dixit, V. Jain
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引用次数: 4

Abstract

In this research paper, we have analyzed free space optical (FSO) link performance for intensity modulated/direct detection (IMDD) system utilizing L-ary pulse position modulation (L-PPM) and differential pulse position modulation (DPPM) schemes. Generally, FSO link performance is impaired by atmospheric turbulence. Error correcting codes (ECCs) is one of the mitigation techniques to reduce the impact of atmospheric turbulence. For this work, we have employed Bose-Chaudhuri-Hocquenghem (BCH) code under a slow fading channel condition with and without an interleaver. We have made the performance comparison in terms of bit error rate under different turbulence regimes viz., low, moderate and high regime for L-PPM (L=4,8 and 32) and differential PPM (DPPM) schemes. We conclude that BCH code with an interleaver for 32-PPM scheme provides a maximum coding gain of 25 dB in a high turbulence regime whereas BCH code without an interleaver degrades the BER performance in a slow fading channel. Also, with the DPPM scheme, neither coding nor interleaving can improve its performance. Therefore, the DPPM scheme will not be useful from this perspective.
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慢衰落信道中L-PPM和DPPM码的误码率分析
在本研究中,我们分析了利用L-ary脉冲位置调制(L-PPM)和差分脉冲位置调制(DPPM)方案的强度调制/直接检测(IMDD)系统的自由空间光(FSO)链路性能。一般来说,FSO链路的性能会受到大气湍流的影响。纠错码(ECCs)是减少大气湍流影响的缓解技术之一。在这项工作中,我们在有或没有交织器的慢衰落信道条件下使用了Bose-Chaudhuri-Hocquenghem (BCH)码。我们对不同湍流状态下的误码率进行了性能比较,即L-PPM (L=4,8和32)和差分PPM (DPPM)方案的低、中、高状态。我们得出结论,在高湍流状态下,带有32 ppm交织器的BCH码提供了25 dB的最大编码增益,而没有交织器的BCH码在慢衰落信道中会降低误码率性能。此外,对于DPPM方案,无论是编码还是交错都不能提高其性能。因此,从这个角度来看,DPPM方案不会有用。
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