For some reason, the channel model's frequency_offset is not in Hz.
Rather its a fraction of the sample rate. You should pass in
my_offset_in_hz/my_sample_rate to this parameter.
The signal source works like that. I suppose that means that the sample
rate and frequency are redundant because you really only care about the
ratio between them.
_josh
oh consistency...
On 06/28/2010 02:12 PM, John Andrews wrote:
Hi,
I have a nagging doubt about how the channel model is implemented in
gnuradio. Suppose I have an input signal entering the channel model at
100,000 samples/sec. Let's say the channel model has to add an offset of
1000Hz to the input signal. Then I must have 100,000 samples of a 1000Hz
SINE_WAVE signal and multiply each input sample with a corresponding input
sample. Am I right? If I am right then i don't see this happening here with
the sampling rate given as 1 in the line below
d_freq_offset = gr_make_sig_source_c(1, GR_SIN_WAVE, frequency_offset, 1.0,
0.0);
If I am wrong then will someone please correct me here.
thank you very much
John
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