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Thermal Noise Cancelling

Started by sonofland January 21, 2007
Hi All,

I have read some post before regarding to the adaptive white noise
cancelling  using simulink, it seems impossible to cancel the noise unless
both reference noise signal and the noise in primary signal are generated
from the same source.

My question is, as of the thermal noise model we have today, is it
possible to perform thermal noise cancellation? I think the bottom line is
how well the model has to be in order to be applicable on adaptive signal
processing? and any thermal noise model published recently given that
capability? Thanks for any inputs.

thanks,




sonofland wrote:
> Hi All, > > I have read some post before regarding to the adaptive white noise > cancelling using simulink, it seems impossible to cancel the noise unless > both reference noise signal and the noise in primary signal are generated > from the same source. > > My question is, as of the thermal noise model we have today, is it > possible to perform thermal noise cancellation? I think the bottom line is > how well the model has to be in order to be applicable on adaptive signal > processing? and any thermal noise model published recently given that > capability? Thanks for any inputs. > > thanks,
The model for thermal noise we use today is the model from 1927 - so no changes. And of couse the model is accurate to the best of anyone's knowledge. It certainly agrees with experimental results. Adaptive noise cancellers use some predictabilty of the noise source, and for frequencies less than 100s of GHz (room temeprature), the Johnson noise spectrum is flat! So good luck with predicting the next instantaneous noise value. Clay