Blind channel identification in high-data-rate pulse shaping OFDM/OQAM systems

Authors

Helmut Bölcskei, Pierre Duhamel, and Rima Hleiss

Reference

Proc. of IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Annapolis, MD, pp. 154-157, May 1999.

DOI: 10.1109/SPAWC.1999.783042

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Abstract

Pulse shaping OFDM systems based on offset QAM (OFDM/OQAM) are particularly attractive for wireless high-data-rate applications. Since OFDM/OQAM schemes do not employ a cyclic prefix, equalization has to be performed. In this paper, we introduce an algorithm for blind channel identification in pulse shaping OFDM/OQAM systems. Our approach assumes that the receiver knows the transmitter pulse shaping filter. Exploiting cyclostationarity of the received OFDM signal blind channel identification is accomplished using second-order statistics only. The proposed method exhibits low noise sensitivity, is computationally efficient, and does not require knowledge of the channel order. Finally, we provide simulation results demonstrating the performance of the new algorithm.

Keywords

OFDM, offset QAM, pulse shaping, cyclostationarity, blind channel estimation, subspace methods

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