TY - GEN
T1 - Hybrid EM and KF receiver of MIMO OFDM systems in time-varying environments
AU - Wu, Hsin Chang
AU - Lu, I. Tai
PY - 2009
Y1 - 2009
N2 - In this paper, simultaneous channel estimation, carrier frequency offset (CFO) estimation, and data decision are considered for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. It is shown that the expectation maximization (EM) approach is complementary to the Kalman filter (KF) approach where the latter provides poor CFO estimation but good channel estimation and the former provides poor channel estimation but good CFO estimation. A hybrid combination of EM and KF approaches is proposed to take advantages of the strengths and avoid the weaknesses of both approaches. Numerical results have shown the hybrid combination is around 1.2dB better than the non-hybrid approaches (EM or KF) in BER performances. The complexity of the hybrid approach is comparable to the KF approach and is much lower than the EM approach.
AB - In this paper, simultaneous channel estimation, carrier frequency offset (CFO) estimation, and data decision are considered for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. It is shown that the expectation maximization (EM) approach is complementary to the Kalman filter (KF) approach where the latter provides poor CFO estimation but good channel estimation and the former provides poor channel estimation but good CFO estimation. A hybrid combination of EM and KF approaches is proposed to take advantages of the strengths and avoid the weaknesses of both approaches. Numerical results have shown the hybrid combination is around 1.2dB better than the non-hybrid approaches (EM or KF) in BER performances. The complexity of the hybrid approach is comparable to the KF approach and is much lower than the EM approach.
KW - Carrier frequency offset (CFO)
KW - Expectation maximization (EM)
KW - Hybrid approach
KW - Kalman filter (KF)
KW - Multi-input multi-output (MIMO)
KW - Orthogonal frequency division multiplexing (OFDM)
UR - http://www.scopus.com/inward/record.url?scp=70349288277&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349288277&partnerID=8YFLogxK
U2 - 10.1109/WOCN.2009.5010589
DO - 10.1109/WOCN.2009.5010589
M3 - Conference contribution
AN - SCOPUS:70349288277
SN - 9781424434749
T3 - 2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009
BT - 2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009
T2 - 2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009
Y2 - 28 April 2009 through 30 April 2009
ER -