Blind Carrier Frequency Offset Tracking Based on Multiuser Interference Cancellation in OFDMA Uplink Systems
Konferenz: European Wireless 2012 - 18th European Wireless Conference 2012
18.04.2012 - 20.04.2012 in Poznan, Poland
Tagungsband: European Wireless 2012
Seiten: 5Sprache: EnglischTyp: PDF
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.