无源光接入网络中前向纠错编码技术

Forward error correction coding technology in passive optical access networks

无源光接入网络在进行数据通信时容易受到色散、失真等现象的扰动,导致网络性能下降,以往的纠错编码方法均不能很好地解决该种问题。因此,研究无源光接入网络中前向纠错编码技术,提出串行、并行两种编码方法,编码类型选用低密度奇偶校验码。串行编码方法用于对抗大幅度网络干扰,采用递推串行编码将多个周期的编码工作融合在一个周期内,改进了传统串行编码效率低、约束条件多的缺点。并行编码用于对抗小幅度网络干扰,根据编码校验位与通信数据间的线性关系,并进行8个周期的编码工作,以保障网络服务体验。实验结果显示,前向纠错编码技术能够大力缩减无源光接入网络的通信误码率,提高了信噪比。

In the process of data communication,the passive optical access network is vulnerable due to the phenomenon of dispersion and distortion,which results in the decrease of network performance.Therefore,the forward error correction coding technology in passive optical access network is studied,and two kinds of coding methods are proposed.Serial encoding method for large scale network is against interference,using recursive serial encoding to fuse multiple cycles encoding work within one,which improved the low efficiency and multi constraints of traditional serial encoding.Parallel coding is used to deal with the interference of small amplitude network,carry out 8 cycles encoding work according to the linear relationship between the bit and the communication data to guarantee the network service experience.The experimental results show that this method can greatly reduce the bit error rate of the passive optical access network and improve the signal to noise ratio （SNR）.