A subspace-based approach to blind channel identification in pulse shaping OFDM/OQAM systems


Helmut B├Âlcskei, Pierre Duhamel, and Rima Hleiss


IEEE Transactions on Signal Processing, Vol. 49, No. 7, pp. 1594-1598, July 2001.

DOI: 10.1109/78.928712

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We introduce a subspace-based algorithm for the blind identification of time-dispersive channels in pulse shaping OFDM systems based on offset QAM (OFDM/OQAM). Our approach exploits cyclostationarity induced by the use of overlapping pulse shaping filters and uses second-order statistics only. The proposed method is similar in spirit to modulation-induced cyclostationarity [1,2]. Our algorithm assumes symbol-rate sampling in the receiver and does not require knowledge of the channel order. We provide simulation results demonstrating the performance of the new method.


OFDM, offset QAM, pulse shaping, filter design, Zak transform, FFT

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