Hi Oliver,
yep, GNU Radio is just discrete signals, just like in an FPGA – but with
software buffers between software functions :)
That especially means that this is all complex baseband – so, to
represent 20 MHz (= 0.5 MHz · 40), i.e. -10 to +10 MHz, you just need a
sample rate of 20 MS/s.
6MS/
Hi Marcus,
On your advice I went through the first few chapters of the gnuradio
tutorial, and started experimenting again with my device. as best I
understand (please correct me if this is wrong), my signal sources must be
less than half the sample rate for the signals to be well-resolved. The
tro
Hi Oliver,
even just considering the time it takes to synthesize a single image for
the B200's FPGA, not counting time needed to learn where to put your
Verilog: Avoid doing things in the FPGA as far as possible. The 20
minutes it costs to go through the first two or three chapters of the
GNU Radi
How would I then include negative numbers on the Verilog side to kill the
offset? I'm a bit more comfortable with fpga design than with SDR, so for
testing purposes I'd prefer to do it that way.
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Never use a throttle in a flow that includes actual hardware.
You're probably connecting via USB-2.0, which wont' support two channels
at 5Msps.
The tuned center frequency has nothing to do with the sample rate. The
sample rate determines the bandwidth centered around your center
frequency th
So as far as using Verilog goes, how would I remove the offset (as
described in the original post)?
I don't think I can use gnuradio because the sample rate maxes out at
around 5 Msps (if I try to push past this, I get "The total sum of rates
exceeds the maximum capacity of the connection), so for
A quick note from the other Marcus.
The UHD library is NOT a DSP library. If you need to "do things to my
signal", you'll need to do that outside of UHD itself, which is really
just a driver API for the hardware.
This is the domain of software systems like Gnu Radio, or if you're
doing this in
Hi Marcus,
How do i produce a sum of multiple tones using the uhd libraries?
tx_waveforms.cpp lets me set a center frequency with uhd::tune_request_t
tune_request(LO_freq), but what I want is to see an output A1*sin(f1*t +
phi1) + A2 * sin(f2*t + phi2) + ...
Along similar lines, how do I change t
Hi Oliver,
haven't quite thought through an understanding of what you're currently
doing, but:
Since the FPGA image already comes with a convenient-to-use DUC – why
not just produce a constant, and tune digitally to a non-zero frequency?
That way, the CORDICs inside the duc_chain will simply gene
Hello,
I've implemented a DDS signal on the USRP device. In radio_legacy.v, I
input get_tx_I and get_tx_Q as my I and Q channels.
always @(posedge radio_clk) begin tx[31:16] <= (run_tx) ?
get_tx_I[31:16] : tx_idle[31:16]; // I channel tx[15:0] <= (run_tx) ?
get_tx_Q[31:16] : tx_idle[15:0]; //
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