Performance comparison of 2/sup n/ extended prime codes (/spl lambda//sub c/=1) and 2/sup n/ prime codes (/spl lambda//sub c/=2) in fiber-optic CDMA systems

We construct two special families of 2/sup n/ codes, called 2/sup n/ prime codes and 2/sup n/ extended prime codes, for all-optical code-division multiple access (AO-CDMA) applications. Such 2/sup n/ codes are obtained by "modifying" and "extending" prime codes, respectively. The cross-correlation constraint /spl lambda//sub c/ of 2/sup n/ extended prime codes is equal to one, while /spl lambda//sub c/=2 for 2/sup n/ prime codes. Moreover, the bit error rates (BERs) of AO-CDMA systems using the constructed 2/sup n/ codes are analyzed. It is shown that the 2/sup n/ extended prime codes can support a larger number of active users than the 2/sup n/ prime codes for a given BER.