Phase noise and frequency offset compensation in high frequency MIMO-OFDM system

In this paper, we propose a low complexity two stage estimation and compensation scheme for the MIMO-OFDM system, where both the transmit and receive antennas will encounter different phase noise (PHN) and carrier frequency offset (CFO). Specifically, in the first stage, a simple least squares (LS) estimation is proposed to estimated the corrupt channel realizations. In the second stage, based on the corrupt imperfect channel, a low complexity LS estimation algorithm is proposed to estimate the compensate the effective PHN and CFO. The complexity of the algorithm is comparable with that of the traditional zero-forcing/MMSE algorithm in MIMO system. The solution does not require explicit knowledge of the PHN model and hence, is very robust to model variations. Finally, we show by simulations that there is significant performance gain compared with various existing baseline schemes.