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Re: [Discuss-gnuradio] channel model question

From: Josh Blum
Subject: Re: [Discuss-gnuradio] channel model question
Date: Mon, 28 Jun 2010 15:00:02 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100423 Thunderbird/3.0.4

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.


oh consistency...

On 06/28/2010 02:12 PM, John Andrews wrote:
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,

If I am wrong then will someone please correct me here.

thank you very much

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