Blind channel identification and equalization in OFDM-based multi-antenna systems


Helmut Bölcskei, Robert W. Heath Jr., and Arogyaswami J. Paulraj


IEEE Transactions on Signal Processing, Vol. 50, No. 1, pp. 96-109, Jan. 2002.

DOI: 10.1109/78.972486

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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. Orthogonal frequency division multiplexing (OFDM) significantly reduces receiver complexity in multi-antenna broadband systems. In this paper, we introduce an algorithm for blind channel identification and equalization in OFDM-based multi-antenna systems. Our approach uses second-order cyclostationary statistics, employs antenna precoding and yields unique channel estimates (up to a phase rotation for each transmit antenna). Furthermore, it requires only an upper bound on the channel order, it does not impose restrictions on channel zeros, and it exhibits low sensitivity to stationary noise. We present simulation results demonstrating the channel estimator and the corresponding multi-channel equalizer performance.


OFDM, spatial multiplexing, channel identification, channel equalization, blind algorithms, cyclostationarity, precoding

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