On Mon, Sep 29, 2008 at 11:52 AM, sri ram <[EMAIL PROTECTED]> wrote: > 3. However, for a tx. stream of 1's and 0's mixed, I still see the received > amplitude (real part) showing the beat frequency continuously and not going > to 0 for the 0 bits.
When you send alternating 1's and 0's, you are creating a baseband square wave of constant power. The DC offset is half your baseband transmit amplitude, and that energy at DC is upconverted to your carrier frequency. On receive, since you have a frequency offset, you will see a continuous beat frequency resulting from this constant carrier. Superimposed on this will be the harmonics of your square wave up to the Nyquist limit of your baseband sampling rate, or up to the cutoff frequency of the RRC filter if it is in use. You could of course change your baseband to be bipolar (-1, 1), but then again, that's just BPSK. -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com/ _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
