Study on ICI Cancellation Algorithms for Mobile OFDM Systems
Xi Xiao-ping①③; Zhang Can②
①School of Information Sciences and Engineering, Graduate University of
Chinese Academy of Sciences, Beijing 100049, China;②State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049, China; ③Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
Abstract：For broadband OFDM systems, Doppler effect induced by high mobility gives rise to the InterCarrier Interference (ICI). By fully exploiting the ICI distribution property and partial channel information, two novel complexity-reduced Minimum Mean Square Error (MMSE) and Decision-Feedback Equalizer (DFE) are derived. Theoretical analysis and simulations illustrate that the new schemes provide a flexible and controllable approach to obtain the tradeoff between performance and complexity. When compared with existing schemes, the proposed DFE equalizer mitigates the “error floor” effect at the classical receiver and obtains performance improvement with the same computational overheads.
2009, Vol. 31 
