Comparative study of phase jitter models for uplink MC-CDMA and uplink MC-DS-CDMA

In this contribution, we consider the effect of carrier phase jitter on the performance of uplink multicarrier CDMA (MC-CDMA) system and uplink multicarrier direct sequence CDMA (MC-DS-CDMA) system, assuming orthogonal spreading sequences. For this aim, it is proposed to model the phase jitter by Gaussian and Rayleigh laws. Theoretical expressions are derived for the performance degradation caused by the phase jitter. Assuming full load and ideal channel, it is shown that the performance degradation is independent of the number of carriers and the spreading factor, but depends on the jitter variance and the law followed by the phase jitter. Further, we point out that, first, the performance degradations are similar for both systems MC-CDMA and MC-DS-CDMA, and then, the Rayleigh model performs better than Gaussian model for the systems studied.