Title :
Codes for spectral-amplitude-coding optical CDMA systems
Author :
Wei, Zou ; Ghafouri-Shiraz, H.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
fDate :
8/1/2002 12:00:00 AM
Abstract :
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.
Keywords :
block codes; code division multiple access; codes; correlation methods; interference suppression; optical fibre networks; algebraic ways; balanced incomplete block design; codes; former code modification; ideal in-phase cross correlation; modified frequency hopping code; multiuser interference elimination; phase-induced intensity noise suppression; quadratic congruence code; spectral-amplitude-coding optical CDMA systems; synchronous optical CDMA systems; Error correction; Error correction codes; Interference cancellation; Interference elimination; Interference suppression; Multiaccess communication; Multiple access interference; Optical noise; Phase noise; System performance;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2002.800301
