Patent US3560729A successfully refreshed from Google Patents.
US6141567A
Expired / Lapsed
US
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Apparatus and method for beamforming in a changing-interference environment
Assignee: Intel Corp
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Filing: 1999-06-07
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Granted: 2000-10-31
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Expires: 2019-06-07
Abstract
Abstract An apparatus and method for adaptively producing transmitted signals and processing received signals in a communication system which includes smart antenna array of antenna elements. When processing received signals, the invention modifies an existing processing scheme by incorporating information about a second set of signals for which training or other characteristic information such as a reference is unknown to information about a first set of signals for which characteristic information such as a reference is known, prior to executing the processing scheme. This approach can be used to modify the receive weights which determine the relative weight assigned to the signals received from each of a plurality of antenna elements to take into account the presence of a changing interference environment. This permits an adaptive updating of the receive weights based on the additional information provided by the second set of data., and may be accomplished faster and with less computational resources than required to determine the weights based on applying the entire processing scheme to the second set of data. In addition, assuming a relationship between the transmit and receive environment, the invention can also be used to modify the transmit weights used by the base station.
Inventors
- 👤 Michael Youssefmir
- 👤 Mitchell D. Trott
- 👤 Kamaraj Karuppiah
- 👤 Paul Petrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:28
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/06; H04B7/0613; H04B7/0615; H04B7/0619; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0848; H04B7/0851; H04L; H04L25/00; H04L25/02; H04L25/0202; H04L25/0204; H04L25/021; H04B7/0617; H04B7/086; H04L25/03; H04L25/03006; H04L25/03178; H04L25/03203; H04L25/03248; H04L25/0328; H04L25/03299
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
229 words
A method of determining a smart antenna processing strategy to take into account a changing interference environment, the smart antenna processing strategy applied to a signal for transmission to form a set of antenna element signals to transmit to a remote user from a wireless station that includes an array of antenna elements, or applied to a set of received signals from the set of antenna elements of a wireless station to process the received signals and obtain an estimate of a signal transmitted by a remote user to the wireless station, the method comprising: (a) providing a process that computes a smart antenna processing strategy as a function of a first set of received data and a reference signal for the first set of received data, the strategy computation process taking into account the interference environment present in the first set of received data; (b) forming a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) computing the smart antenna processing strategy by using the provided computation process with the combination formed in step (b) as input.
Claim 2
Independent Claim
229 words
A method of determining a smart antenna processing strategy to take into account a changing interference environment, the smart antenna processing strategy applied to a signal for transmission to form a set of antenna element signals to transmit to a remote user from a wireless station that includes an array of antenna elements, or applied to a set of received signals from the set of antenna elements of a wireless station to process the received signals and obtain an estimate of a signal transmitted by a remote user to the wireless station, the method comprising: (a) providing a process that computes a smart antenna processing strategy as a function of a first set of received data and a reference signal for the first set of received data, the strategy computation process taking into account the interference environment present in the first set of received data; (b) forming a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) computing the smart antenna processing strategy by using the provided computation process with the combination formed in step (b) as input.
Claim 3
Dependent Claim
130 words
The method of claim 1, wherein the strategy computation method has as inputs the reference signal, the first set of received data, and an estimate of one or more characteristic features of the first set of received data, wherein the step of forming a combination forms a modified feature estimate of at least one of the characteristic features that the computation process has as input such that the modified estimate incorporates an amount of the characteristic feature of the second set of received data into the respective characteristic feature of the first set of received data, and wherein computing step (c) uses the provided computation process with the first set of received data, the reference signal of the first set of received data, and the modified feature estimate as inputs.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein the amount is an adjustable amount defined by an adjustable parameter.
Claim 5
Dependent Claim
37 words
The method of claim 2, wherein the characteristic feature estimate of the first set of received data input in the provided strategy computation process includes an estimate of the covariance of the first set of received data.
Claim 6
Dependent Claim
22 words
The method of claim 4, wherein the covariance estimate input in the strategy computation process is represented by a noise-plus-interference-plus-signal covariance estimate.
Claim 7
Dependent Claim
20 words
The method of claim 4, wherein the covariance estimate input in the strategy computation process is a noise-plus-interference covariance estimate.
Claim 8
Dependent Claim
75 words
The method of claim 4, wherein the combining step (b) includes forming a modified covariance estimate, forming the modified covariance estimate further comprising: forming a covariance estimate of the first set of received data; forming a covariance estimate of the second set of received data; and summing the covariance estimate of the first set of received data and the product of the covariance estimate of the second set of received data and an adjustable parameter.
Claim 9
Dependent Claim
65 words
The method of claim 4, wherein the combining step (b) includes forming a modified covariance estimate, the forming the modified covariance estimate further comprising performing a matrix factorization of the primary data, performing a matrix factorization of the secondary data, and combining the resulting factors to form the modified covariance estimate, the relative amount of the factors in the combining defined by an adjustable parameter.
Claim 10
Dependent Claim
85 words
The method of claim 1, wherein the strategy computation method implicitly or explicitly uses one or more characteristic features of the first set of received data for interference mitigation, and wherein the step of forming a combination includes: combining the first set of received data and an amount of a set of supplementary signal data determined from the second set of received data and having at least one characteristic feature substantially the same as the corresponding characteristic feature of the second set of received data.
Claim 11
Dependent Claim
17 words
The method of claim 9, wherein the amount is an adjustable amount defined by an adjustable parameter.
Claim 12
Dependent Claim
27 words
The method of claim 9, wherein the set of supplementary signal data determined from the second set of received data includes the second set of received data.
Claim 13
Dependent Claim
38 words
The method of claim 9, wherein the combining is by forming a sum of the first set of received data and the amount of the set of supplementary signal data determined from the second set of received data.
Claim 14
Dependent Claim
24 words
The method of claim 9, wherein the combining includes performing a matrix factorization of the primary and secondary data and combining the resulting factors.
Claim 15
Dependent Claim
43 words
The method of claim 1, wherein the first set of received data and second set of received data are received burst-by-burst, and wherein the first set of received data and second set of received data are contained in the same burst of data.
Claim 16
Dependent Claim
42 words
The method of claim 1, wherein the first set of received data and second set of received data are received burst-by-burst, and wherein the first set of received data and second set of received data are contained in different bursts of data.
Claim 17
Dependent Claim
25 words
The method of claim 1, further comprising the step of: applying the determined smart antenna processing strategy to process the second set of received data.
Claim 18
Dependent Claim
24 words
The method of claim 1, further comprising the step of: applying the determined smart antenna processing strategy to process a third set of data.
Claim 19
Dependent Claim
32 words
The method of claim 1, wherein applying the smart antenna processing strategy includes applying a set of weights, and wherein the smart antenna processing strategy computation process computes the set of weights.
Claim 20
Dependent Claim
60 words
The method of claim 1, wherein the first set of received data includes received signal data from when the remote user is transmitting data to the wireless station, such that the smart antenna processing strategy determined in step (c) direct a beam towards the remote user and directs nulls towards interferers that are included in the second set of data.
Claim 21
Dependent Claim
27 words
The method of claim 1, wherein the first set of received data includes received signal data from when the reference signal passes a reference signal selection test.
Claim 22
Dependent Claim
57 words
The method of claim 1, further including: (d) providing an iterative strategy computation method that iteratively determines a final antenna processing strategy starting with an initial antenna processing strategy, wherein the smart antenna processing strategy determined in step (c) is used as the initial antenna processing strategy for the iterative strategy computation method provided in step (d).
Claim 23
Independent Claim
170 words
An apparatus for processing a set of received signals received from an antenna array of a wireless station, the apparatus comprising: (a) a reference signal processor to provide reference signal data for a first set of received signals; (b) a combiner to form a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) an adaptive smart antenna strategy computation processor configured to compute a smart antenna strategy to apply to the set of received signals to determine an estimate of a user signal transmitted by a remote user or to apply to a signal for transmission to transmit the transmission signal to the remote user, the strategy computation processor having the reference signal data and the combination as inputs.
Claim 24
Independent Claim
170 words
An apparatus for processing a set of received signals received from an antenna array of a wireless station, the apparatus comprising: (a) a reference signal processor to provide reference signal data for a first set of received signals; (b) a combiner to form a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) an adaptive smart antenna strategy computation processor configured to compute a smart antenna strategy to apply to the set of received signals to determine an estimate of a user signal transmitted by a remote user or to apply to a signal for transmission to transmit the transmission signal to the remote user, the strategy computation processor having the reference signal data and the combination as inputs.
Claim 25
Dependent Claim
86 words
The apparatus of claim 22, wherein the combiner includes a feature estimator and forms a feature estimate of at least one the characteristic feature of the first set of received data, the feature estimate incorporating an amount of the characteristic feature of the second set of received data into the respective characteristic feature of the first set of received data, and wherein the strategy computation processor has as inputs the reference signal, the first set of received data, and the feature estimate formed by the combiner.
Claim 26
Dependent Claim
33 words
The apparatus of claim 23, wherein the feature estimator includes a covariance estimator for estimating the covariance, and the estimated covariance is coupled to the feature estimate input of the strategy computation processor.
Claim 27
Dependent Claim
25 words
The apparatus of claim 24, wherein the covariance estimator determines a noise-plus-interference-plus-signal covariance estimate coupled to the feature estimate input of the strategy computation processor.
Claim 28
Dependent Claim
28 words
The apparatus of claim 24, wherein the covariance wherein the covariance estimator determines a noise-plus-interference covariance estimate coupled to the feature estimate input of the strategy computation processor.
Claim 29
Dependent Claim
104 words
The apparatus of claim 24, wherein the combiner is further configured to implement: a first covariance estimator having as input the first set of received data; a second covariance estimator having as input the second set of received data; and a summer to sum the covariance estimate of the first set of received data output by the first covariance estimator and the product of the covariance estimate of the second set of received data output by the first covariance estimator and an adjustable parameter, the summer forming a covariance estimate, the covariance estimate coupled to the feature estimate input of the strategy computation processor.
Claim 30
Dependent Claim
82 words
The apparatus of claim 24, wherein the combiner is further configured to form as output a modified covariance estimate, the modified covariance estimate forming including performing a matrix factorization of the primary data, performing a matrix factorization of the secondary data, and combining the resulting factors to form the modified covariance estimate, the relative amount of the factors in the combining defined by an adjustable parameter, the modified covariance estimate output coupled to the feature estimate input of the strategy computation processor.
Claim 31
Dependent Claim
17 words
The apparatus of claim 23, wherein the amount is an adjustable amount defined by an adjustable parameter.
Claim 32
Dependent Claim
81 words
The apparatus of claim 22, wherein the strategy computation processor implicitly or explicitly uses one or more characteristic features of the first set of received data for interference mitigation, and wherein is configured to combine the first set of received data and an amount of a set of supplementary signal data determined from the second set of received data and having at least one characteristic feature substantially the same as the corresponding characteristic feature of the second set of received data.
Claim 33
Dependent Claim
17 words
The apparatus of claim 30, wherein the amount is an adjustable amount defined by an adjustable parameter.
Claim 34
Dependent Claim
30 words
The apparatus of claim 30, wherein the set of supplementary signal data determined by the combiner from the second set of received data includes the second set of received data.
Claim 35
Dependent Claim
40 words
The apparatus of claim 30, wherein the combiner is further configured to forming a sum of the first set of received data and the amount of the set of supplementary signal data determined from the second set of received data.
Claim 36
Dependent Claim
28 words
The apparatus of claim 30, wherein the combiner is further configured to perform a matrix factorization of the primary and secondary data and to combining the resulting factors.
Claim 37
Dependent Claim
43 words
The apparatus of claim 22, wherein the first set of received data and second set of received data are received burst-by-burst, and wherein the first set of received data and second set of received data are contained in the same burst of data.
Claim 38
Dependent Claim
42 words
The apparatus of claim 22, wherein the first set of received data and second set of received data are received burst-by-burst, and wherein the first set of received data and second set of received data are contained in different bursts of data.
Claim 39
Dependent Claim
22 words
The apparatus of claim 22, wherein the determined smart antenna processing strategy is applied to process the second set of received data.
Claim 40
Dependent Claim
21 words
The apparatus of claim 22, wherein the determined smart antenna processing strategy is applied to process a third set of data.
Claim 41
Dependent Claim
46 words
The apparatus of claim 22, further comprising: (d) a transmit signal circuit for forming a transmit strategy from the determined smart antenna processing strategy and from calibration data, the calibration data accounting for differences in the receive and transmit electronic paths for the different antenna elements.
Claim 42
Dependent Claim
29 words
The apparatus of claim 22, wherein applying the smart antenna processing strategy includes applying a set of weights, and wherein the strategy computation processor computes the set of weights.
Claim 43
Independent Claim
160 words
An apparatus for processing a set of received signals received from an antenna array of a wireless station, the apparatus comprising: (a) means for providing reference signal data for a first set of received signals; (b) means for forming a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) means for computing an adaptive smart antenna strategy to apply to the set of received signals to determine an estimate of a user signal transmitted by a remote user or to apply to a signal for transmission to transmit the transmission signal to the remote user, the strategy computation processor having the reference signal data and the combination as inputs.
Claim 44
Independent Claim
160 words
An apparatus for processing a set of received signals received from an antenna array of a wireless station, the apparatus comprising: (a) means for providing reference signal data for a first set of received signals; (b) means for forming a combination as a function of the first set of received data and a second set of received data, the combination including data incorporating the second set of received data such that the combination takes into account aspects of the interference environment present in the second set of received data and not in the first set of received data; and (c) means for computing an adaptive smart antenna strategy to apply to the set of received signals to determine an estimate of a user signal transmitted by a remote user or to apply to a signal for transmission to transmit the transmission signal to the remote user, the strategy computation processor having the reference signal data and the combination as inputs.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-31 | 2004-05-01 | 2004-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-31 | 2008-05-01 | 2008-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-31 | 2012-05-01 | 2012-10-31 | $7700.00 | Window Closed / Lapsed |