S. Salari, K.N. Toosi University of Technology, Tehran, Iran
M. Ahmadian, K.N. Toosi University of Technology, Tehran, Iran
In this paper, we consider carrier-frequency offset (CFO) estimation issue in a multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) system using low-density paritycheck (LDPC) codes at transmitter and iterative detection based on the maximum a posteriori expectation-maximization (MAP-EM) demodulator and a soft LDPC decoder at receiver. Based on the EM algorithm, we first present a novel pilot-aided CFO estimator that allows fast Fourier-transform (FFT)- based fast implementation. Then this CFO estimator is incorporated into the initialization step of the iterative receiver. Experimental results show the effectiveness of our receiver design in combating CFO.
Citation:
S. Salari, M. Ahmadian, M. Ardebilipour, V. Meghdadi, J.P. Cances, "Carrier-Frequency Offset Estimation via the EM Algorithm for MIMO-OFDM Iterative Receivers," cnsr, pp.101-106, Fifth Annual Conference on Communication Networks and Services Research (CNSR '07), 2007