Codes for spectral-amplitude-coding optical CDMA systems

Codes with ideal in-phase cross correlation (CC) are required in spectral-amplitude-coding optical code-division multiple-access (CDMA) systems since these codes eliminate multiuser interference and also suppress the effect of phase-induced intensity noise. However, little research work has been done on such codes although codes with ideal CC have been studied for many years. In a paper by Zhou et al. (2000), such a code has been introduced, but no clear construction method has been presented. In this paper, we first review the construction method of this old code and then construct two new codes with ideal in-phase CC in algebraic ways. Both of the proposed new codes are obtained by modifying former codes with ideal CC. It has been shown that the system performance can be improved significantly by using codes with ideal in-phase CC instead of the Hadamard code. These codes can also be used in the synchronous optical CDMA systems for multiuser interference cancellation.

[1]  G. Einarsson Address assignment for a time-frequency-coded, spread-spectrum system , 1980, The Bell System Technical Journal.

[2]  Allen H. Levesque,et al.  Error-control techniques for digital communication , 1985 .

[3]  Jawad A. Salehi,et al.  Code division multiple-access techniques in optical fiber networks. I. Fundamental principles , 1989, IEEE Trans. Commun..

[4]  Jawad A. Salehi,et al.  Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis , 1989, IEEE Trans. Commun..

[5]  Edward L. Titlebaum,et al.  The design and performance analysis for several new classes of codes for optical synchronous CDMA and for arbitrary-medium time-hopping synchronous CDMA communication systems , 1994, IEEE Trans. Commun..

[6]  Mohsen Kavehrad,et al.  Optical code-division-multiplexed systems based on spectral encoding of noncoherent sources , 1995 .

[7]  Desmond P. Taylor,et al.  Performance enhancement of spectral-amplitude-coding optical CDMA using pulse-position modulation , 1998, IEEE Trans. Commun..

[8]  Lu Chao,et al.  Design and performance analysis of a new code for spectral-amplitude-coding optical CDMA systems , 2000, 2000 IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications. ISSTA 2000. Proceedings (Cat. No.00TH8536).

[9]  Xiang Zhou,et al.  Code for spectral amplitude coding optical CDMA systems , 2000 .

[10]  H.M.H. Shalaby,et al.  New code families for fiber-Bragg-grating-based spectral-amplitude-coding optical CDMA systems , 2001, IEEE Photonics Technology Letters.