Blind channel estimation in spatial multiplexing systems using nonredundant antenna precoding
Helmut Bölcskei, Robert W. Heath Jr., and Arogyaswami J. Paulraj
Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove (CA), Vol. 2, pp. 1127-1132, Oct. 1999
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Wireless systems employing multiple antennas at the transmitter and the receiver have recently been shown to have the potential of achieving extraordinary bit rates. In this paper, we consider the problem of blind channel estimation in single-carrier broadband multi-antenna systems. Assuming a linear time-invariant matrix channel with delay spread, we propose an algorithm for the blind estimation of the matrix channel which uses second-order cyclostationary statistics. Our approach employs nonredundant precoding and yields unique estimates (up to a diagonal matrix of phase terms). Furthermore, it does not require knowledge of the channel order, imposes no restrictions on the channel zeros, and exhibits low sensitivity to stationary noise. We present simulation results demonstrating the performance of the proposed method.
Smart antennas, spatial multiplexing, blind channel estimation, cyclostationarity, MIMO systems
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