Carrier frequency offset correction for uplink multi-user MIMO for next generation Wi-Fi

In this paper, we study carrier frequency offset estimation and correction for uplink multi-user MIMO (UL MU-MIMO) for Wi-Fi, where distributed stations (STAs) send multiple data streams to a common access point (AP) with multiple receive antennas. We provide a description of the proposed system, and propose a three-step approach using a joint phase estimation algorithm for carrier frequency synchronization that takes advantage of the existing pilot signals to deliver good performance and also has low complexity. We provide simulation results to demonstrate that the proposed approach incurs negligible performance loss due to carrier frequency offsets.