Optical orthogonal codes with large crosscorrelation and their performance bound for asynchronous optical CDMA systems

Author

Weng, Chi-Shun ; Wu, Jingshown

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

21

Issue

3

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

735

Lastpage

742

Abstract

Optical orthogonal codes (OOCs) are commonly used as signature codes for optical code-division multiple-access (OCDMA) communication systems. Many OOCs have been proposed and investigated. Asynchronous OCDMA systems using conventional OOCs have a very limited number of subscribers and few simultaneous users. Recently, we reported a new code family with large code size by relaxing the crosscorrelation constraint to 2. In this paper, by further loosening the crosscorrelation constraint, we adopt the random greedy algorithm to construct a code family which has larger code size and more simultaneous users. We also derive an upper bound of the number of simultaneous users for a given code length, code weight, and bit error rate. The study shows that it is possible to have codes approaching this bound.

Keywords

code division multiple access; codes; error statistics; multiuser channels; optical correlation; optical fibre networks; asynchronous optical CDMA systems; bit error rate; code length; code weight; large code size; large crosscorrelation; multiuser interference; optical orthogonal codes; perfect difference code; performance bound; random greedy algorithm; signature codes; simultaneous users; Autocorrelation; Bit error rate; Councils; Greedy algorithms; Multiaccess communication; Multiple access interference; Optical receivers; Robustness; Upper bound;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2003.809547

Filename

1197939