New Code Construction for Multirate Transmission In Optical Fiber CDMA Networks

Abstract

The purpose of this paper is to investigate the multirate transmission in ¯ber-optic code-division multiple-access (CDMA) networks. In this paper, we show a new construction of optical orthogonal code to implement a multirate optical CDMA system (called as the multirate code system). For comparison, a multirate system where the low rate user sends each symbol twice is implemented and is called as the repeat code system. Theoretical analysis shows that the bit error probability of the multirate code system is smaller than that of the repeat code system, especially when the number of low rate users is larger. Moreover, if there is any low rate user in the system, the multirate code system accommodates more users than the repeat code system when the error probability of system is set below 10¡ 9.