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Blind Channel Estimation for Orthogonal STBC in MISO Systems

Summary: 1
Blind Channel Estimation for Orthogonal STBC in
MISO Systems
Elzbieta Beres, and Raviraj Adve
University of Toronto
10 King's College Road
Toronto, ON M5S 3G4, Canada
This paper presents a closed-form blind channel estimation scheme for orthogonal space-time block codes in
multiple-input single-output (MISO) systems, with specific focus on Alamouti's code for two transmit antennas.
The channel matrix is estimated from the eigenvalue decomposition of the fourth-order cumulant matrix of the
received signal. Unlike previous blind estimation schemes for MISO systems, the proposed algorithm is tested with
block and slowly fading channels. The proposed scheme performs very well in both cases. A single pilot-tuple is
required to correctly assign the estimated to the actual channels and to resolve the sign ambiguity common to all
blind estimators. It is shown that this scheme outperforms the only other available blind channel estimation scheme
for this scenario. To achieve good performance in terms of bit error rate, 100 - 300 sample points are sufficient to
provide accurate channel estimates. The main disadvantage of the proposed scheme is the complexity associated
with estimation of fourth-order cumulants. This complexity is reduced by exploiting the symmetry inherent in the
cumulant matrix.


Source: Adve, Raviraj - Department of Electrical and Computer Engineering, University of Toronto


Collections: Engineering