Correlation-based frequency offset estimation in MIMO system

The paper addresses the problem of frequency offset estimation in the presence of unknown channel information for a MIMO system. An efficient pilot symbol-aided algorithm for frequency offset estimation is proposed. Taking advantage of the orthogonal property of Walsh codes, a second-order estimator, which can substantially mitigate the MAI (multi-antenna interference), is proposed. We also derive the Cramer-Rao bound for the MIMO system; the numerical results are compared with simulation results to illustrate the efficiency of the novel algorithm.