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GNU Radio is a free software development toolkit that provides the signal processing runtime and processing blocks to implement software radios.

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1 answer
792 views

Why samples per symbols $\geq 2$ in the GNURadio Constellation Modulator block?

If I use the GNURadio Constellation Modulator block for this, it imposes a lower limit on samples/second. This results in a different bandwidth for the GNURadio graph, than the real system. …
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2 answers
743 views

Why is the bandwidth for this QPSK system larger than expected?

Below is my gnuradio-companion graph. As you can see the sample rate is 100k, I am modulating with QPSK, and am filtering the waveform (RRC) with the "Excess BW" parameter, at 0.35. …