BCH信道编码对快跳频光码分多址系统性能的改善  

Performance Enhancement for FFH-OCDMA Systems by BCH Channel Coding

作　　者：吉建华[1] 范戈[1] 

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200030

出　　处：《上海交通大学学报》2003年第3期359-361,共3页Journal of Shanghai Jiaotong University

摘　　要：分析了单重合码的互相关性能 ,得出了未编码的快跳频光码分多址 ( FFH- OCDMA)系统误码率性能的具体表达式 .论述了 BCH信道编码对 FFH- OCDMA系统性能的影响 ,并将它和未编码的 FFH- OCDMA系统进行了比较 .结果表明 ,在相同的信息比特速率、切普间隔、有效波长数时 ,两个系统的误码率性能基本相当 ,但使用 BCH信道编码后 ,单重合码的长度将变短 ,这样不仅降低了光纤光栅的制作难度 ,且增加了单重合码的码字数 ,从而提高了系统容量 .The cross-correlation performance of one-coincidence sequence was analyzed, and the BER representation of fast frequency-hopping OCDMA networks was deduced. Then, the performance of BCH-coded FFH-OCDMA system was analyzed, and was compared with uncoded FFH-OCDMA system. It is shown that the two systems have comparable performance under the same bit rate, same chip interval and same number of available wavelengths. However, for BCH-coded FFH-OCDMA systems, the length of one-coincidence sequence will be shorter, which can not only reduce the difficulty of fabrication for fiber gratings, but also enhance the system throughout by larger cardinality of one-coincidence sequences.

关 键 词：快跳频光码分多址 BCH码 单重合码 误码率 

分 类 号：TN929.11[电子电信—通信与信息系统] TN929.18[电子电信—信息与通信工程]