Phase noise mitigation in OFDMA uplink

This paper addresses the problem of the phase noise induced spectral spread in an OFDMA uplink scenario. Accompanied with power differences between the users at the receiver in a multiuser case, the phase noise induced spread causes performance degradation for users with low signal powers. This paper proposes a receiver-side digital signal processing methods to estimate and mitigate the spread caused by the transmitter-side phase noise. The introduced methods show a significant gain when compared with other conventional phase noise estimation and mitigation methods that are not designed especially for the multiuser scenario.