May be I have not explain my question well, and make others feel confuse. The input signal can be expressed as Fc=cos(2*pi*fc*t+a(t)), where fc is the frequency the carrier, and a(t) is the information which modulated into carrier. But the SDR(software define radio) doesn't deal with the Fc directly, It just deal with I/Q signal. I signal: SI=1/2*cos(2*pi*(fc-fs)*t+a(t)),and Q signal: SQ=-1/2*sin(2*pi*(fc-fs)+a(t)) In the real time application, fc will have little difference with fs, and the difference between fc and fs is call carrier offset. So, my question is how to remove carrier offset in the I/Q signals. Thanks for any reply.
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