Phase offset as measured against what, and how would that matter for a not-phase-sensitive modulation?
Sent from my iPhone > On Jun 22, 2020, at 11:39 PM, Kevin Hung <[email protected]> wrote: > > > 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 list >>> [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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