简介(摘　要 关键词 分类号 文章编号)

参考文献

简介

采用改进素数码的异步跳频扩时光码分多址系统的理论分析

马文华　左超　林金桐

摘　要

通过对改进素数码的不同脉冲位置赋予不同的频率，提出了一种新的跳频扩时码.理论分析表明，此跳频码的个数为p3，且有很好的自相关和互相关特性.数值结果也表明在使用双限幅器的前提下，这种跳频扩时码的异步光码分多址系统有良好的性能.给出了针对这种跳频码的编解码器方案.

关键词

光码分多址； 跳频码； 改进素数码； 双限幅器

分类号

TN929.11　文献标识码：A

文章编号

1007-5321(2001)01-0001-05

The Analysis on Asynchronous Frequency-Time Spreading OCDMA System with Modified Prime Code

MA Wen-hua（Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China）

ZUO Chao（Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China）

LIN Jin-tong（Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China）

Abstract：A novel frequency-time spreading code by designating the different frequencies to the different mark positions of the modified prime code is proposed.Theoretical analysis demonstrates that the number of the proposed codes can amount fo p3.Cross-correlation and the sidelobe of auto-correlation of the proposed code have relatively lower values.The numerical results show that the asynchronous OCDMA system assuming the proposed code reveal excellent performance in the presence of double hard limiters.

Keywords：OCDMA； frequency hopping code； modified prime code； double hard limiters

作者简介：马文华(1975—)，男，河南三门峡市人，博士生.

作者单位：马文华（北京邮电大学电信工程学院， 北京 100876）

左超（北京邮电大学电信工程学院， 北京 100876）

林金桐（北京邮电大学电信工程学院， 北京 100876）

参考文献

［1］　Salehi J A.Code division multiple-access techniques in optical fiber networks-part I:fundamental principles［J].IEEE Transactions On Communications,1989,8(37):824-833.

［2］　Sato K，Ohtsuki T，Uehara H，et al.Performance of optical direct-detection CDMA system using prime sequence code[A].Conf Rec ICC'95[C].1995.1 312-1 316.

［3］　Ohtsuki T，Sato K,Sase I,et al.Direct-detection optical synchronous CDMA system with double optical hard-limiters using modified prime sequence codes[A].GLOBECOM'95[C].Singapore:1995.2 156-2 160.

［4］　Fathallag H,Rusch L A,Larochelle S.Passive optical fast freqnencyhop CDMA communication system[J].Journal of Lightwave Technology,1999,3(17):397-405.

［5］　Yu K，Shin J，Park N.Novel wavelength-time spreading optical CDMA system using arrayed-waveguide grating[A].OFC'2000[C].2000.

［6］　Ohtsuki T.Performance analysis of direct-detection optical asynchronous CDMA systems with double optical hard-limiters[J].Journal of Lightwave Technology,1997,3(15):452-457.