Just my guess. The rx IQ samples are rotated by a constant phase offset. On Mon, Jun 22, 2020 at 9:53 PM Marcus D. Leech via USRP-users < [email protected]> wrote:
> On 06/22/2020 09:14 PM, Ernest Poletaev via USRP-users wrote: > > Hello everyone, > > I'm new to SDR and trying to implement transmission with AM Modulation > using uhd library with B205mini board. > > Currently I have following procedure: > > Set RX and TX parameters for RF frequency, channel 0 > Set sampling frequency to 1M samples per second > Set RX and TX gain > Receiving as sc8, sc8 > Transmitting as fc32, sc8 > > -loop: > > Receiving: > > As usual with AM demodulation and it is working > > Transmitting: > > On audio sink get next 4096 samples of 44.1KHz 16 bit PCM raw audio > Convert each 16 bit sample to complex float with Q=[audio sample > normalized to -1 - 1] and I = 0 > Resample (simple interpolation) 44100Hz buffer to 1MHz > Send buffer for transmission > > -end loop > > As RX and TX have same frequency I can see data on RF Analyzer, but it > didn't demodulates to an audio signal. > > Am I missing something or my assumption is wrong on some steps? > > Regards, > Ernest > > > _______________________________________________ > USRP-users mailing > [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > I'm going to suggest that if you're new to SDR and DSP, you might invest > the time to install Gnu Radio, which provides a very rich environment > for not only constructing DSP flows for most popular SDR radios, but > also debugging those flows when they don't work out as you expect. > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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