Re: [Discuss-gnuradio] channel model question

[Josh Blum]

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
>
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio