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Novel approach to the design of I/Q demodulation filters

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4 Author(s)
Zhang, G. ; R. Mil. Coll. of Canada, Kingston, Ont., Canada ; Al-Khalili, D. ; Inkol, R. ; Saper, R.

A novel filter design approach to digital I/Q demodulation is proposed. Two possible realisations are presented using this approach. The first one is based on the highpass filter method which is suitable for B⩽f0 and while the other realisation is based on the lowpass filter method suitable for B⩽f0, where B and f 0 are the IF signal bandwidth and the IF frequency, respectively. Both new realisations maintain the advantages of an earlier lowpass approach such as zero DC offset, matched channel frequency responses, and good performance over a wide bandwidth. At the same time, the new highpass filter realisation method possesses higher computational efficiency than other wideband approaches reported in the literature

Published in:

Vision, Image and Signal Processing, IEE Proceedings -  (Volume:141 ,  Issue: 3 )