3 ms·
20 MHz --> 40M samples per second (Nyquist). 16 bits per channel, and two channels (I, Q). 40000000 x 2 x 2, so... about 160 MB/sec? It's a lot of data. It
by rachelbythebay 7y ago
20 MHz --> 40M samples per second (Nyquist). 16 bits per channel, and two channels (I, Q).
40000000 x 2 x 2, so... about 160 MB/sec?
It's a lot of data. It wasn't happening with the disk I had on hand, so I went for the ramdisk thing. 1.6 GB of memory? That I did have.
- jcims 7y agoWould be nice if you could use flowgraphs to program any fpgas on the radio.
- madengr 7y agoYou can with RFNoc blocks in GNU Radio, but that’s specific to Ettus hardware.
- rrss 7y agoI think you have an extra factor of two there. If you need 20 MHz without aliasing, you either need real sampling at 40 MS/s or IQ sampling at 20 MS/s, but IQ sampling at 40 MS/s is overkill. Nyquist works differently if your samples are complex.
- madengr 7y ago20 MHz only requires 20 Msps of complex samples. It would be 40 Msps if those were real samples.