FSO通信系统中基于交织技术的Spinal码突发纠错策略

Outburst error correction strategy for Spinal codes in FSO communication systems based on an interleaving technique

Spinal码的无速率特性使其在自由空间光通信系统中具有良好的应用前景。针对Spinal码在湍流信道下遇到突发差错导致系统性能下降的问题,提出将交织技术引入Spinal码的编译码过程,并在基于GPU的仿真平台上对Spinal码的性能进行仿真。仿真结果表明:在湍流信道和加性高斯白噪声(AWGN)信道下,经过交织的Spinal码译码成功时所用的通道数低于未交织的Spinal码,其平均码率也比未交织时高约0.4~3.8bit/symbol。此外,经过交织的Spinal码在大气湍流信道下的性能波动比未交织的Spinal码小一半以上。

Spinal codes have a promising application in free space optical communication systems due to its rateless nature. This paper presents the idea of introducing the interleaved technique into the process of Spinal codes' coding and encoding to solve the problem of system performance degradation when signals are transmitted through turbulence channels, which can cause outburst errors. The performances of the Spinal codes are simulated on the GPU-based platform. The simulation results show that in both turbulence channels and additive white gaussian noise(AWGN) channels, the number of passes used in the interleaved Spinal code is less than that of the uninterleaved Spinal code and its average rate is about 0.4 bit/symbol to 3.8 bit/symbol higher than the uninterleaved Spinal code. In addition, the performance fluctuation of the interleaved Spinal codes over atmospheric turbulence channels is less than half of the uninterleaved Spinal codes.