Phase Noise Mitigation for V-BLAST OFDM system

Abstract

Future wireless mobile systems are required to transport multimedia traffics at much higher bit rates. Among all feasible implementations, V-BLAST OFDM system is one of the most promising candidates for such goal. However, similar to SISO-OFDM, V-BLAST OFDM suffers significant performance degradation due to the presence of phase noise. Although several phase noise mitigation method have been proposed in the literature for SISO channel, none has addressed this MIMO scenario, in which the performance degradation is more severe than SISO as it faces more complicated channel with little diversity gain. Moreover, in the original work of V-BLAST, a large number of antennas (8 transmit and 12 receive antennas) were proposed to obtain high bit rate. This may imply that multiple oscillators would be used to support such system. Most phase noise mitigation methods deal with one oscillator case, while in this paper, by considering the general case for any number of oscillators, we proposed a phase noise mitigation (PNM) scheme, which efficiently reduces the effect of multiple phase noise generated by different oscillators in V-BLAST OFDM system. Although the algorithm developed is based on independent MIMO channel, its effectiveness in correlated channel is also numerically evaluated.