一种结合LDPC和VBLAST的新型FSO链路级联编码方案

2015 IEEE International Conference on Communication Software and Networks (ICCSN) Pub Date : 2015-06-06 DOI:10.1109/ICCSN.2015.7296152

Huiqin Wang, Fen Wang, Minghua Cao

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引用次数: 5

摘要

我们提出了一种结合低密度奇偶校验(LDPC)码和垂直贝尔实验室分层空时(VBLAST)码的新型串接编码方案，以提高开关键控(OOK)调制下自由空间光通信链路的误码率(BER)性能。该方案对LDPC码采用π旋转编码和BP译码算法，对VBLAST码采用最小均方误差(MMSE)软判决译码算法。此外，采用VBLAST码和LDPC码的联合迭代检测译码算法，提高了链路的整体性能。最后，利用蒙特卡罗方法分析了该方案在对数正态大气湍流衰落信道上的误码率。结果表明，所提出的串联编码方案的误码率比单纯使用VBLAST编码方案的误码率有很大提高。

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A novel concatenated coding scheme combined LDPC and VBLAST for FSO links

We propose a novel concatenated coding scheme combined Low Density Parity Check(LDPC) code and vertical Bell Labs layered space-time (VBLAST) code to improve the bit error rate (BER) performance for Free-space optical (FSO) communication links with On Off Keying(OOK) modulation. In the scheme, π-rotation encoding and belief-propagation (BP) decoding algorithm are employed in LDPC code, and minimum mean-square error (MMSE) soft-decision decoding algorithm is used for VBLAST code. Moreover, a joint iterative detection and decoding algorithm of VBLAST code and LDPC code is used to improve the overall link performance. At last, the BER of the proposed scheme over lognormal atmospheric turbulent fading channels is analyzed by using Monte Carlo method. The result shows that the BER of the proposed concatenated coding scheme is much improved than that only use VBLAST code scheme.

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2015 IEEE International Conference on Communication Software and Networks (ICCSN)

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