基于BCH信道编码的FFH-OCDMA系统  

FFH-OCDMA Systems Using BCH Channel Coding

作　　者：吉建华[1] 吴琛[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：《光电子．激光》2002年第11期1126-1136,共11页Journal of Optoelectronics·Laser

摘　　要：提出用BCH信道编码的方案来降低色散和差拍噪声对快跳频光码分多址(FFH-OCDMA)系统性能的影响。分析了BCH/FFH-OCDMA系统的色散效应,并将色散效应等效为功率衰减因子,得出同时考虑差拍噪声和色散后BCH/FFH-OCDMA系统的误码率性能。结果表明,在相同的信息比特速率、切普间隔和有效波长数的情况下,BCH信道编码能显著改善FFH-OCDMA系统的误码率性能。同时,由于单重合码的长度变短,降低了光纤光栅的制做难度。The BCH channel coding scheme is proposed to reduce the impact of chromatic dispersion and optical beat interference on the performances of fast frequencyhopping optical codedivision multipleaccess(FFHOCDMA) networks.The impact of chromatic dispersiion on BCH/FFHOCDMA is analyzed,and it is equivalent to an energy attenuation factor.Then,the BER performance of BCH/FFHOCDMA is educed after considering the effect of optical beat interference and chromatic dispersion.Analysis results show that,under the same bit rate and same chip interval and same number of available wavelengths,the BER performance of BCH/FFHOCDMA is much better than uncoded FFHOCDMA systems.For BCH/FFHOCDMA systems,the length of onecoincidence sequence will be shorter,which can reduce the difficulty of fabrication for fiber gratings.

关 键 词：BCH 信道编码 FFH-OCDMA系统 快跳频光码分多址 差拍噪声 色度色散 单重合码 

分 类 号：TN914.53[电子电信—通信与信息系统]