RS码在25 G-EPON系统中的性能研究

Performance analysis of Reed-Solomon codes in 25 G-EPON system

前向纠错技术是保证25 G-EPON系统数据传输可靠性的关键技术。针对25 G-EPON系统由于高传输速率导致数据在传送过程中出现更多随机错误和长连续突发错误的问题,通过分析RS编译码算法,选择合适的RS码特征参数,仿真分析了这些参数对25 G-EPON系统传输性能的影响,确定适用于25 G-EPON通信系统的RS码方案。实验结果表明,在满足25 G-EPON系统可靠性的前提下,应尽可能降低编码效率、提高编码的冗余度、采用码长较短的编码方案,以提高RS码的编码增益、降低信息传输的误码率。RS(1023,847)码能纠正最多连续880 bits错误,在误码率达到10-12时的编码增益可以达到8.834 dB,可以满足25 G-EPON系统传输需求,因此选用RS(1023,847)码作为25 G-EPON系统的前向纠错码。

Forward error correction is the key technology to ensure the reliability of data transmission in25 G-EPON system.For 25 G-EPON system,random errors and continuous burst errors often occur in the process of data transmission due to the high transmission.By analyzing the RS coding and decoding algorithm and selecting the appropriate RS characteristic parameters,the influence of these parameters on the transmission performance of 25 G-EPON system is simulated and analyzed.Then the appropriate RS code scheme is chosen for 25 G-EPON communication system.The experimental results show that under the premise of satisfying the reliability of the 25 G-EPON system,the coding efficiency should be reduced as much as possible,the redundancy of coding should be improved and the coding scheme with shorter code length should be adopted,so as to improve the coding gain of the RS code and reduce the bit error rate of information transmission.It is shown that RS(1023,847) code can correct up to 880 bits errors consecutively,and the coding gain can reach 8.834 dB when the symbol error rate reaches 10-12,which can meet the transmission requirements of 25 G-EPON system.Therefore,RS(1023,847) code is selected as the forward error correction code of 25 G-EPON system.