| Abstract |
: |
In this paper, a novel prime code family called constant weight and variable length prime code (CWVLPC) is presented. The CWVL prime code is constructed from the basic prime codes which are generated using modulo-p addition. Since the proposed code family possesses very good correlation property (cross correlation equal to zero), the system eliminates the phase induced intensity noise (PIIN) and multi user interference (MUI) completely. In addition, for any given prime number p, we can generate p number of code families with different length. Further, the weight of the proposed code is kept always equal to one independent of the prime number p and the p number of code families; thus it can simplify the design of encoder/decoder structures of the proposed SAC-OCDMA system. Also, bit error rate performance of the developed code is much better than the commonly used MQC code. To illustrate, for p=17 and an acceptable bit error rate of 10-9, the proposed coding system supports 225 simultaneous users with code length of 289 at an effective source power of -5 dBm. |
