On Thu, Oct 13, 2011 at 08:51:40PM -0400, Raullen Chai wrote: > Hi, > > > Could somebody give me some tips and help on the following problem? Really > appreciated! > > > The input signal is b1(t)*sin(f1*t) + b2(t)*sin(f2*t), where f1 and f2 are > close but different, and b1(t) and b2(t) are two different square waves > with different period. > > After the USRP down coverts this wave to the baseband, the two modulated sine > waves are mixed. How could I extract b2(t) or b1(t) respectively?
How close are they with respect to the period length of the square waves? If they are easily separated 'visually' in an FFT of the duration of one pulse, you should be fine with filtering. Try a different filter, with steeper flanks. Don't worry about doing something extreme, you will only distort your phase which doesn't seem important. MB > I tried to used a baseband filter, but it seems not work well. -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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