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
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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.
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