Fa, Rui (Department of Electrical Engineering and Electronics, The University of Liverpool, L69 3GJ, UK)
Zhang, Li; Ramirez-Gutierrez, Raymundo (School of Electronic and Electrical Engineering, University of Leeds, Leeds, LS2 9JT, UK)
In this paper, we propose a novel blind CFO tracking algorithm for the OFDMA uplink systems with the generalized carrier assignment scheme (GCAS). The proposed blind CFO tracking technique is built on a low complexity grouped minimum mean squared error based multi-stage interference cancellation (G-MMSE-MIC) scheme, which feeds decisions to drive the CFO tracking. The CFO tracking is implemented by using a bank of closed-loops to track the time-varying CFOs in the decision-directed (DD) mode without pilot tones. The simulation results demonstrate that the proposed blind CFOs tracking scheme performs well in the presence of time-varying CFOs with affordable complexity.