Iterative Interference Cancellation for Multi-Code PR/MC-CDMA

The uplink transmission performance, e.g., bit error rate (BER) performance, of multi-carrier-code division multiple access (MC-CDMA) is limited by the multi-access interference (MAI). Recently, we proposed a FD-PR/MC-CDMA, which uses frequency domain phase rotation and symbol mapping onto equi-distantly spaced sub-carriers. In FD-PR/MC-CDMA, multiple users can be multiplexed without causing MAI as long as the number of multiplexed users is smaller than the spreading factor devided by the maximum channel length. However, the number of users to be accommodated is limited by the length of the channel impulse response and the spreading factor. To increase the number of users or the data rate per user, the code multiplexing is effective, but this results in the performance degradation. In this paper, an iterative interference cancellation is applied to FD-PR/MC-CDMA and the impacts of the spreading factor and the length of the channel impulse response are evaluated by computer simulation.