US6131013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for performing targeted interference suppression
Assignee: Google Technology Holdings LLC
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Filing: 1998-01-30
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Granted: 2000-10-10
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Expires: 2018-01-30
Abstract
Abstract The invention relates to a communication system (300) having a receiver (304) that is capable of performing targeted interference suppression. An interference classifier (314) within the receiver (304) analyzes a signal received from a channel (306) and identifies and classifies interference components within the signal. An interference suppressor (316) then suppresses the interference components in the signal based on interference type. In one embodiment, the interference suppressor (316) includes a plurality of interference suppression modules that are each optimal for suppressing certain interference types. The interference suppressor (316) selects one of the interference suppression modules based on the type of interference present in the received signal. In another embodiment, a hybrid interference mitigation system (10) is provided by combining targeted interference suppression, frequency hopping adaptation, and processing gain adaptation.
Inventors
- 👤 Chad Scott Bergstrom
- 👤 Jeffrey Scott Chuprun
- 👤 John Eric Kleider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:12
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12; H04B1/123; H04L; H04L1/00; H04L1/0001; H04L1/12; H04L1/20; H04L27/00; H04L27/0012; H04L1/0023; H04L1/0026
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
106 words
A receiver unit for use in a communications system that is operative in a predetermined frequency band, comprising: a signal receptor for receiving a signal from a communications channel; an interference classifier for classifying an interference component within said signal, wherein said interference classifier classifies said interference component according to a plurality of interference types, and said interference classifier outputting a signal indicative of classification of each of said interference types; and an interference suppressor for suppressing said interference component by selecting one of a plurality of suppression methods best suited to suppress said signal based on the indication signal of classification of said interference type.
Claim 2
Dependent Claim
106 words
A receiver unit for use in a communications system that is operative in a predetermined frequency band, comprising: a signal receptor for receiving a signal from a communications channel; an interference classifier for classifying an interference component within said signal, wherein said interference classifier classifies said interference component according to a plurality of interference types, and said interference classifier outputting a signal indicative of classification of each of said interference types; and an interference suppressor for suppressing said interference component by selecting one of a plurality of suppression methods best suited to suppress said signal based on the indication signal of classification of said interference type.
Claim 3
Dependent Claim
34 words
A receiver unit, as claimed in claim 1, wherein: said interference suppressor includes means for selecting from a plurality of interference suppression methods best suited to suppress said interference type, based on interference type.
Claim 4
Dependent Claim
50 words
A receiver unit as claimed in claim 1, wherein said interference suppressor includes: a plurality of interference suppression modules for use in suppressing interference in said signal; and means for selecting at least one of said interference suppression modules best suited to suppress said interference type, based on interference type.
Claim 5
Dependent Claim
22 words
A receiver unit, as claimed in claim 3, wherein: said interference suppression modules are each optimized for use with predetermined interference types.
Claim 6
Dependent Claim
41 words
A receiver unit, as claimed in claim 3, wherein: said means for selecting includes means for selecting multiple interference modules based on multiple interference components in said signal, wherein said interference suppressor cascades said multiple interference modules to process said signal.
Claim 7
Dependent Claim
28 words
A receiver unit, as claimed in claim 1, wherein: said interference classifier includes at least one of the following: a multi-layer perceptron classifier and a decision tree classifier.
Claim 8
Dependent Claim
25 words
A receiver unit, as claimed in claim 1, wherein: said interference classifier includes means for extracting parameters relating to said interference component from said signal.
Claim 9
Dependent Claim
29 words
A receiver unit, as claimed in claim 7, wherein: said means for extracting parameters includes a means for determining at least one feature parameter transformation for said interference component.
Claim 10
Dependent Claim
67 words
A receiver unit, as claimed in claim 8, wherein: said means for determining at least one feature parameter transformation includes means for receiving input in-phase signal samples x(i) and quadrature signal samples y(i) and for processing the samples according to the following transformation equations: px(j)=y(i+τ)[y(i)-x(i)]+x(i+τ)[x(i)+y(i)] py(j)=x(i+τ)[x(i)-y(i)]+y(i+τ)[y(i)+x(i)] where px(j) and py(j) are the in-phase and quadrature transformations, respectively; τ=delay, in samples; i=1 to N; and j=1 to N-τ.
Claim 11
Dependent Claim
25 words
A receiver unit, as claimed in claim 8, wherein: said means for determining at least one feature parameter transformation includes means for generating a histogram.
Claim 12
Dependent Claim
28 words
A receiver unit, as claimed in claim 8, wherein: said means for determining at least one feature parameter transformation includes means for performing a polar to Cartesian transformation.
Claim 13
Dependent Claim
27 words
A receiver unit, as claimed in claim 8, wherein: said means for determining at least one feature parameter transformation includes means for performing a histogram magnitude projection.
Claim 14
Dependent Claim
27 words
A receiver unit, as claimed in claim 8, wherein: said means for determining at least one feature parameter transformation includes means for performing a histogram phase/frequency projection.
Claim 15
Dependent Claim
35 words
A receiver unit, as claimed in claim 7, wherein: said interference classifier includes a memory means for storing parameters for known interference types, said stored parameters being for comparison with parameters extracted from said signal.
Claim 16
Dependent Claim
20 words
A receiver unit, as claimed in claim 1, wherein: said interference classifier includes a co-processor for performing complex arithmetic operations.
Claim 17
Dependent Claim
51 words
A receiver unit, as claimed in claim 1, further comprising: a performance estimator for determining at least one performance metric relating to the performance of said communications system and feedback means for delivering said at least one performance metric to said interference suppressor for use in fine tuning the interference suppressor.
Claim 18
Dependent Claim
26 words
A receiver unit, as claimed in claim 1, wherein: said communications system is a spread spectrum personal communications system (PCS) that overlays a narrowband/partialband communications system.
Claim 19
Dependent Claim
24 words
A receiver unit, as claimed in claim 1, wherein: said communications system is a spread spectrum paging system that overlays a narrowband/partialband communications system.
Claim 20
Dependent Claim
23 words
A receiver unit, as claimed in claim 1, wherein: said communications system is a wireless LAN system that overlays a narrowband/partialband communications system.
Claim 21
Dependent Claim
22 words
A receiver unit, as claimed in claim 1, wherein: said receiver unit is part of a handheld transceiver capable of duplex operation.
Claim 22
Dependent Claim
29 words
A receiver unit, as claimed in claim 1, wherein: said interference classifier includes means for improving the signal to noise ratio (SNR) of said signal before classification is performed.
Claim 23
Dependent Claim
28 words
A receiver unit, as claimed in claim 21, wherein: said means for improving SNR includes preclassification filtering means for use in separating an interference component from said signal.
Claim 24
Dependent Claim
19 words
A receiver unit, as claimed in claim 21, wherein: said means for improving SNR includes a phase domain filter.
Claim 25
Dependent Claim
23 words
A receiver unit, as claimed in claim 23, wherein: said phase domain filter is for use in separating a plurality of interference components.
Claim 26
Dependent Claim
17 words
A receiver unit, as claimed in claim 23, wherein: said phase domain filter comprises a moving average.
Claim 27
Independent Claim
75 words
A method for reducing interference components in a received signal in a communications system, comprising the steps of: receiving a signal from a channel; classifying at least one interference component in said signal according to interference type; and performing interference suppression on said signal to reduce the level of said interference component within said signal, said performing step including selecting an interference suppression method from a plurality of interference suppression methods based on interference type.
Claim 28
Independent Claim
75 words
A method for reducing interference components in a received signal in a communications system, comprising the steps of: receiving a signal from a channel; classifying at least one interference component in said signal according to interference type; and performing interference suppression on said signal to reduce the level of said interference component within said signal, said performing step including selecting an interference suppression method from a plurality of interference suppression methods based on interference type.
Claim 29
Dependent Claim
22 words
The method, as claimed in claim 26, wherein: said classifying step includes extracting parameters from said signal relating to said interference component.
Claim 30
Dependent Claim
22 words
The method, as claimed in claim 26, wherein: said classifying step includes seperating said interference components from a plurality of interference components.
Claim 31
Dependent Claim
67 words
The method, as claimed in claim 26, wherein: said plurality of interference suppression methods includes an adaptive excision method including the following steps: obtaining a frequency domain representation of said signal; determining a frequency location of said interference component with respect to said frequency domain representation; and removing a portion of said frequency domain representation of said signal based on said frequency location of said interference component.
Claim 32
Dependent Claim
21 words
The method, as claimed in claim 29, wherein: said removing step includes applying a band-reject filter to said frequency domain representation.
Claim 33
Dependent Claim
54 words
The method, as claimed in claim 26, wherein: said plurality of interference suppression methods includes an inverse weight method including the following steps: obtaining a frequency domain representation of said signal; determining portions of said frequency domain representation that exceed a limit value; and reducing said portions in magnitude using an inverse weighting function.
Claim 34
Dependent Claim
29 words
The method, as claimed in claim 31, wherein: said inverse weighting function is inversely proportional to the difference between a magnitude of said portions and said predetermined limit value.
Claim 35
Dependent Claim
22 words
The method, as claimed in claim 32, further comprising the step of: adaptively adjusting said limit value based on a predetermined criterion.
Claim 36
Dependent Claim
20 words
The method, as claimed in claim 33, wherein: said predetermined criterion includes a signal strength estimate for said interference component.
Claim 37
Dependent Claim
20 words
The method, as claimed in claim 33, wherein: said predetermined criterion includes a standard deviation estimate for said interference component.
Claim 38
Dependent Claim
19 words
The method, as claimed in claim 33, wherein: said predetermined criterion includes a bandwidth estimate for said interference component.
Claim 39
Dependent Claim
75 words
The method, as claimed in claim 26, wherein: said plurality of interference suppression methods includes an inverse whitening method including the following steps: obtaining a frequency domain representation of said signal; determining a spectral envelope of said interference component using said frequency domain representation; generating an inverse envelope function using said spectral envelope; and applying said inverse envelope function to said frequency domain representation of said signal to reduce said interference component in said signal.
Claim 40
Dependent Claim
54 words
The method, as claimed in claim 26, wherein: said plurality of interference suppression methods includes an inverse whitening method including the following steps: determining a spectral envelope using time domain samples of said signal; generating an inverse envelope function using said spectral envelope; and applying said inverse envelope function to said time domain samples.
Claim 41
Dependent Claim
137 words
A communications system having hybrid interference mitigation, said system comprising: means for receiving a signal from a channel; means for classifying at least one interference component within said signal according to interference type , and said interference classifier outputting a signal indicative of classification of each of said interference types; means for suppressing said at least one interference component by selecting one of a plurality of suppression methods best suited to suppress said signal based on the indication signal of classification of said interference type; and adaptation means including at least one of the following: means for performing frequency hopping adaptation by updating a frequency hopping sequence in response to said means for classifying; and means for performing processing gain adaptation by updating the processing gain of a transmit signal in response to said means for classifying.
Claim 42
Dependent Claim
137 words
A communications system having hybrid interference mitigation, said system comprising: means for receiving a signal from a channel; means for classifying at least one interference component within said signal according to interference type , and said interference classifier outputting a signal indicative of classification of each of said interference types; means for suppressing said at least one interference component by selecting one of a plurality of suppression methods best suited to suppress said signal based on the indication signal of classification of said interference type; and adaptation means including at least one of the following: means for performing frequency hopping adaptation by updating a frequency hopping sequence in response to said means for classifying; and means for performing processing gain adaptation by updating the processing gain of a transmit signal in response to said means for classifying.
Claim 43
Dependent Claim
27 words
The communications system, as claimed in claim 39, wherein: said adaptation means includes both means for performing frequency hopping adaptation and means for performing processing gain adaptation.
Claim 44
Dependent Claim
30 words
The communications system, as claimed in claim 39, wherein: said adaptation means is enabled when an output signal of said means for suppressing fails to achieve a predetermined performance goal.
Claim 45
Dependent Claim
25 words
The communications system, as claimed in claim 41, wherein: said predetermined performance goal includes a bit error rate (BER) being less than a predetermined value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-10 | 2004-04-10 | 2004-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-10 | 2008-04-10 | 2008-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-10 | 2012-04-10 | 2012-10-10 | $7700.00 | Window Closed / Lapsed |