Multiple phase noise correction for OFDM/SDMA

It has been proposed in the literature that phase noise causes severe performance degradation of OFDM systems and therefore need to be corrected. A combined OFDM/SDMA approach has been proposed in the literature allowing simultaneous transmitted user terminals which give rise to multiple phase noise. Conventional correction methods proposed in the literature are targeted for single phase noise and do not apply for multiple phase noise. We therefore propose a new multiple phase noise correction (MPNC) scheme which takes advantage of spatial diversity and mitigates the effects of multiple phase noise on the OFDM/SDMA receiver performance. The MPNC scheme presents quite good performance with few pilots involved per user. Numerical results are given to illustrate the effectiveness of the proposed scheme for an uplink OFDM/SDMA system.