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

• Published in: IEEE transactions on signal processing Vol. 49; no. 7; pp. 1594 - 1598
• Main Authors: Bolcskei, H., Duhamel, P., Hleiss, R.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2001; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Applied sciences; Blinds; Channels; Computer science; control theory; systems; Computer simulation; Control theory. Systems; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Filters; Information, signal and communications theory; Modelling and identification; OFDM modulation; Orthogonal Frequency Division Multiplexing; Pulse shaping methods; Quadrature amplitude modulation; Receivers; Sampling; Sampling methods; Satellite broadcasting; Signal and communications theory; Signal processing; Signal, noise; Statistics; Telecommunication standards; Telecommunications and information theory; Wireless sensor networks; Performance evaluation; Simulation; Transmission channel; Order statistic; Amplitude modulation; System identification; Quadrature modulation; Equalization; Frequency division multiplexing; Algorithm
• ISSN: 1053-587X; 1941-0476
• DOI: 10.1109/78.928712

We introduce a subspace-based algorithm for the blind identification of time-dispersive channels in pulse shaping OFDM systems based on offset quadrature amplitude modulation (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. 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.