Method for whitening colored noise in a communication system
First Claim
1. In a communication network, a method for whitening colored noise present at the input of a receiver, the method comprising:
- sampling colored noise present at the input of the receiver during a sampling interval to produce a sampled signal;
spectrally characterizing the sampled signal across a frequency band of interest to produce a spectral characterization of the sampled signal;
modifying the spectral characterization of the sampled signal to produce a modified spectral characterization;
generating filter settings based upon the modified spectral characterization; and
when a signal of interest and colored noise are present at the input of the receiver, filtering the input using the filter settings to whiten the colored noise at the input.
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Abstract
A filter settings generation operation includes sampling colored noise present at the input of a receiver to produce a sampled signal. The sampled signal is spectrally characterized across a frequency band of interest to produce a spectral characterization of the sampled signal. This spectral characterization may not include a signal of interest. The spectral characterization is then modified to produce a modified spectral characterization. Filter settings are then generated based upon the modified spectral characterization. Finally, the input present at the receiver is filtered using the filter settings when the signal of interest is present to whiten colored noise that is present with the signal of interest. In modifying the spectral characterization, pluralities of spectral components of the spectral characterization are independently modified to produce the modified spectral characterization. Modifications to the spectral characterization may be performed in the frequency domain and/or the time domain. Particular modifications include amplifying spectral components, weighting spectral components based upon prior spectral components, and averaging spectral components with prior spectral components.
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Citations
47 Claims
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1. In a communication network, a method for whitening colored noise present at the input of a receiver, the method comprising:
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sampling colored noise present at the input of the receiver during a sampling interval to produce a sampled signal;
spectrally characterizing the sampled signal across a frequency band of interest to produce a spectral characterization of the sampled signal;
modifying the spectral characterization of the sampled signal to produce a modified spectral characterization;
generating filter settings based upon the modified spectral characterization; and
when a signal of interest and colored noise are present at the input of the receiver, filtering the input using the filter settings to whiten the colored noise at the input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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19. In a communication network, a method for whitening colored noise present at the input of a receiver, the method comprising:
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sampling colored noise present at the input of the receiver during a sampling interval to produce a sampled signal;
spectrally characterizing the sampled signal across a frequency band of interest to produce a spectral characterization of the sampled signal;
modifying the spectral characterization of the sampled signal to produce a modified spectral characterization by;
amplifying each of a plurality of spectral components of the spectral characterization by one of a plurality of gain factors; and
averaging each of the plurality of spectral components with corresponding spectral components of prior spectral characterizations;
generating filter settings based upon the modified spectral characterization; and
when a signal of interest and colored noise are present at the input of the receiver, filtering the input using the filter settings to whiten the colored noise at the input.
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34. In a communication network, a method for whitening colored noise present at the input of a receiver, the method comprising:
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sampling colored noise present at the input of the receiver during a sampling interval to produce a sampled signal;
spectrally characterizing the sampled signal across a frequency band of interest to produce a spectral characterization of the sampled signal;
determining a characterization of the noise power of the spectral characterization;
modifying the spectral characterization of the sampled signal to produce a modified spectral characterization by;
amplifying each of a plurality of spectral components of the spectral characterization by one of a plurality of gain factors;
weighting each of the plurality of spectral components based upon the spectral component, the characterization of the noise power of the spectral characterization, and characterizations of the noise power of prior spectral characterizations; and
averaging each of the plurality of spectral components with corresponding spectral components of prior spectral characterizations;
generating filter settings based upon the modified spectral characterization; and
when a signal of interest and colored noise are present at the input of the receiver, filtering the input using the filter settings to whiten the colored noise at the input.
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Specification