TY - GEN
T1 - Joint blind channel estimation and interference suppression for OFDM systems
AU - Amleh, Khaled
AU - Li, Hongbin
PY - 2005
Y1 - 2005
N2 - This paper presents a blind joint channel and interference suppression for orthogonal frequency-division multiplexing (OFDM) systems. Our approach uses a generalized multi-channel minimum variance principle to design an equalizing filterbank that preserves the desired signal components and suppresses the overall interference. Channel estimate is then obtained by deriving an asymptotically tight lower bound of the filterbank output power, which reduces the problem to a quadratic minimization. While a channel estimate may be obtained by directly maximizing the filterbank output power through multidimensional nonlinear searches, such an approach is computationally prohibitive and suffers local convergence. Numerical examples show that the proposed scheme approaches the Cramér-Rao bound (CRB) as the SNR increases. It also exhibits low sensitivity to unknown narrowband interference and compares favorably with a subspace blind channel estimator.
AB - This paper presents a blind joint channel and interference suppression for orthogonal frequency-division multiplexing (OFDM) systems. Our approach uses a generalized multi-channel minimum variance principle to design an equalizing filterbank that preserves the desired signal components and suppresses the overall interference. Channel estimate is then obtained by deriving an asymptotically tight lower bound of the filterbank output power, which reduces the problem to a quadratic minimization. While a channel estimate may be obtained by directly maximizing the filterbank output power through multidimensional nonlinear searches, such an approach is computationally prohibitive and suffers local convergence. Numerical examples show that the proposed scheme approaches the Cramér-Rao bound (CRB) as the SNR increases. It also exhibits low sensitivity to unknown narrowband interference and compares favorably with a subspace blind channel estimator.
UR - http://www.scopus.com/inward/record.url?scp=33646808984&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646808984&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2005.1415747
DO - 10.1109/ICASSP.2005.1415747
M3 - Conference contribution
AN - SCOPUS:33646808984
SN - 0780388747
SN - 9780780388741
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - III465-III468
BT - 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing,ICASSP '05 - Proceedings - Audio and ElectroacousticsSignal Processing for Communication
T2 - 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05
Y2 - 18 March 2005 through 23 March 2005
ER -