On Wed, Aug 5, 2015 at 7:25 AM, monika bansal <monika19...@gmail.com> wrote:
> Hii > > I am using channels.channel_model as > > channels_channel_model_0 = channels.channel_model( > noise_voltage = self.EbN0_to_noise_voltage(EbN0), > frequency_offset=0.0, > epsilon=1.0, > taps=(1.0 + 0j, ), > noise_seed=RAND_SEED, > block_tags=True > ) > > in the place of Add and Noise_Source in berawgn.py file.. But the BER is > not following the theory curve. I am attaching the curve i got. > > What does this channel model do ? Can someone please explain it. > The channel_model is a hierarchical block to add noise, frequency offset, timing offset, and a constant channel. In your case, you've turned off everything but the noise source, which is generated using a gr::analog::noise_source_c. http://gnuradio.org/doc/doxygen/classgr_1_1channels_1_1channel__model.html My guess is that you're setting the noise voltage level incorrectly. Tom
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