CA2555106A1 - Methods and apparatus for adaptively performing algebraic interference cancellation - Google Patents
Methods and apparatus for adaptively performing algebraic interference cancellation Download PDFInfo
- Publication number
- CA2555106A1 CA2555106A1 CA002555106A CA2555106A CA2555106A1 CA 2555106 A1 CA2555106 A1 CA 2555106A1 CA 002555106 A CA002555106 A CA 002555106A CA 2555106 A CA2555106 A CA 2555106A CA 2555106 A1 CA2555106 A1 CA 2555106A1
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- Prior art keywords
- interference
- interest
- signal
- element signals
- projection operator
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
- H01Q3/2611—Means for null steering; Adaptive interference nulling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03592—Adaptation methods
- H04L2025/03598—Algorithms
- H04L2025/03605—Block algorithms
Abstract
An adaptive alge aic interference cancellation technique for canceling interference from a signal of interest received by an array of antenna elements involves:
generating a set of antenna element signals that reflect reception of the signal of interest and interference at the respective antenna elements; adaptively determining the direction of one or more interference sources received with the signal of interest; for each interference source, constructing a directional interference vector corresponding to the direction of the interference source; computing a projection operator that transforms each directional interference vector to a zero vector; applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
generating a set of antenna element signals that reflect reception of the signal of interest and interference at the respective antenna elements; adaptively determining the direction of one or more interference sources received with the signal of interest; for each interference source, constructing a directional interference vector corresponding to the direction of the interference source; computing a projection operator that transforms each directional interference vector to a zero vector; applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
Claims (12)
1. A method of canceling interference from a signal of interest received by a phased array antenna comprising a plurality of antenna elements, the method comprising:
(a) generating a plurality of antenna element signals that reflect reception of the signal of interest and interference at the plurality of antenna elements, respectively;
(b) adaptively determining the direction of one or more interference sources received with the signal of interest;
(c) for each interference source, constructing a directional interference vector corresponding to the direction of the interference source;
(d) computing a projection operator that transforms each directional interference vector to a zero vector;
(e) applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and (f) restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
(a) generating a plurality of antenna element signals that reflect reception of the signal of interest and interference at the plurality of antenna elements, respectively;
(b) adaptively determining the direction of one or more interference sources received with the signal of interest;
(c) for each interference source, constructing a directional interference vector corresponding to the direction of the interference source;
(d) computing a projection operator that transforms each directional interference vector to a zero vector;
(e) applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and (f) restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
2. The method of claim 1, wherein:
the phased array antenna comprises M antenna elements;
the projection operator is an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M; and the matrix A is computed to satisfy the expression Aiu = 0 for n = 1 to k, where 1n are the directional interference vectors.
the phased array antenna comprises M antenna elements;
the projection operator is an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M; and the matrix A is computed to satisfy the expression Aiu = 0 for n = 1 to k, where 1n are the directional interference vectors.
3. The method of claim 1, wherein (b) includes determining weights that correspond to directions of interference sources.
4. The method of claim 3, wherein the weights are determined without performing a beamforming operation with the weights.
5. An apparatus for canceling interference from a signal of interest, comprising:
a phased array antenna comprising a plurality of antenna elements that respectively generate a plurality of antenna element signals that reflect reception of the signal of interest and interference at the antenna elements; and a processor configured to: adaptively determine the direction of one or more interference sources received with the signal of interest; for each interference source, construct a directional interference vector corresponding to the direction of the interference source, compute a projection operator that transforms each directional interference vector to a zero vector; apply the projection operator to the antenna element signals to remove interference from the antenna element signals; and restore the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
a phased array antenna comprising a plurality of antenna elements that respectively generate a plurality of antenna element signals that reflect reception of the signal of interest and interference at the antenna elements; and a processor configured to: adaptively determine the direction of one or more interference sources received with the signal of interest; for each interference source, construct a directional interference vector corresponding to the direction of the interference source, compute a projection operator that transforms each directional interference vector to a zero vector; apply the projection operator to the antenna element signals to remove interference from the antenna element signals; and restore the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
6. The apparatus of claim 5, wherein:
the phased array antenna comprises M antenna elements; and the processor computes the projection operator as an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M, wherein the matrix A is computed to satisfy the expression Ain = 0 for n = 1 to k, where in are the directional interference vectors.
the phased array antenna comprises M antenna elements; and the processor computes the projection operator as an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M, wherein the matrix A is computed to satisfy the expression Ain = 0 for n = 1 to k, where in are the directional interference vectors.
7. The apparatus of claim 5, wherein the processor adaptively determines weights that correspond to directions of interference sources.
8. The apparatus of claim 7, wherein the processor determines the weights without performing a beamforming operation with the weights.
9. An apparatus for canceling interference from a signal of interest, comprising:
a phased array antenna comprising a plurality of antenna elements that respectively generate a plurality of antenna element signals that reflect reception of the signal of interest and interference at the antenna elements; and means for adaptively determining the direction of one or more interference sources received with the signal of interest;
means for constructing a directional interference vector corresponding to the direction of each interference source;
means for computing a projection operator that transforms each directional interference vector to a zero vector;
means for applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and means for restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
a phased array antenna comprising a plurality of antenna elements that respectively generate a plurality of antenna element signals that reflect reception of the signal of interest and interference at the antenna elements; and means for adaptively determining the direction of one or more interference sources received with the signal of interest;
means for constructing a directional interference vector corresponding to the direction of each interference source;
means for computing a projection operator that transforms each directional interference vector to a zero vector;
means for applying the projection operator to the antenna element signals to remove interference from the antenna element signals; and means for restoring the signal of interest by individually compensating the antenna element signals for distortion to the signal of interest cause by applying the projection operator.
10. The apparatus of claim 9, wherein:
the phased array antenna comprises M antenna elements; and the means for computing the projection operator computes the projection operator as an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M, wherein the matrix A is computed to satisfy the expression Ain = 0 for n = 1 to k, where in are the directional interference vectors.
the phased array antenna comprises M antenna elements; and the means for computing the projection operator computes the projection operator as an MxM matrix A of rank M-k, where k is the number of interference sources identified in (b) and k < M, wherein the matrix A is computed to satisfy the expression Ain = 0 for n = 1 to k, where in are the directional interference vectors.
11. The apparatus of claim 9, wherein the means for adaptively determining the direction of interference sources adaptively determines weights that correspond to directions of interference sources.
12. The apparatus of claim 11, wherein the means for adaptively determining the direction of interference sources determines the weights without performing a beamforming operation with the weights.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/202,182 | 2005-08-12 | ||
| US11/202,182 US7420509B2 (en) | 2005-08-12 | 2005-08-12 | Methods and apparatus for adaptively performing algebraic interference cancellation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2555106A1 true CA2555106A1 (en) | 2007-02-12 |
| CA2555106C CA2555106C (en) | 2011-10-11 |
Family
ID=37744712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2555106A Active CA2555106C (en) | 2005-08-12 | 2006-08-01 | Methods and apparatus for adaptively performing algebraic interference cancellation |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US7420509B2 (en) |
| CA (1) | CA2555106C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8754810B2 (en) | 2009-02-02 | 2014-06-17 | Commonwealth Scientific And Industrial Research Organisation | Hybrid adaptive antenna array |
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| KR100923913B1 (en) * | 2005-11-17 | 2009-10-28 | 삼성전자주식회사 | Apparatus and method for canceling multi user interference |
| US20070287380A1 (en) * | 2006-05-29 | 2007-12-13 | Bitwave Pte Ltd | Wireless Hybrid Headset |
| EP2015462A1 (en) * | 2007-06-04 | 2009-01-14 | STMicroelectronics N.V. | Beamforming in UWB with dynamic frequency assignment in a distributed network |
| US8537789B2 (en) * | 2007-08-01 | 2013-09-17 | Harris Corporation | Mobile ad-hoc network providing communication latency reduction features and related methods |
| US8155093B2 (en) * | 2007-08-01 | 2012-04-10 | Harris Corporation | Mobile ad-hoc network providing desired link delay offset without guard times and related methods |
| US9262912B2 (en) * | 2008-02-25 | 2016-02-16 | Checkpoint Systems, Inc. | Localizing tagged assets using modulated backscatter |
| US20090323860A1 (en) * | 2008-06-27 | 2009-12-31 | Infineon Technologies Ag | Receiving and processing data |
| US8144057B1 (en) * | 2008-12-11 | 2012-03-27 | Exelis Inc. | Methods and apparatus for adaptively determining angles of arrival of signals |
| KR101721615B1 (en) * | 2009-04-17 | 2017-03-30 | 마벨 월드 트레이드 리미티드 | Segmented beamforming |
| WO2012128522A2 (en) * | 2011-03-18 | 2012-09-27 | 삼성전자 주식회사 | Method and apparatus for interference alignment in a wireless communication system |
| US9215012B2 (en) * | 2012-04-26 | 2015-12-15 | Propagation Research Associates, Inc. | Method and system for using orthogonal space projections to mitigate interference |
| US9401741B2 (en) | 2012-04-26 | 2016-07-26 | Propagation Research Associates, Inc. | Methods and systems for mitigating signal interference |
| US10571224B2 (en) | 2015-05-04 | 2020-02-25 | Propagation Research Associates, Inc. | Systems, methods and computer-readable media for improving platform guidance or navigation using uniquely coded signals |
| US11405083B2 (en) * | 2018-03-06 | 2022-08-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Un-manned aerial vehicle comprising an antenna element panel |
| US11070397B2 (en) * | 2019-03-15 | 2021-07-20 | Qualcomm Incorporated | Adaptive OTA leakage cancellation for mmWave radar |
| US11018705B1 (en) | 2020-07-17 | 2021-05-25 | Propagation Research Associates, Inc. | Interference mitigation, target detection, location and measurement using separable waveforms transmitted from spatially separated antennas |
| FR3116401B1 (en) * | 2020-11-19 | 2022-11-18 | Safran Electronics & Defense | Method for processing a GNSS signal in order to attenuate at least one interference signal |
| US11330594B1 (en) * | 2020-11-25 | 2022-05-10 | Qualcomm Incorporated | Optimized UE beamforming with null space report |
| CN113050127B (en) * | 2021-04-13 | 2024-01-02 | 广州海格通信集团股份有限公司 | Signal processing method, apparatus, computer device and storage medium |
| CN113281788B (en) * | 2021-05-26 | 2022-01-18 | 国网江苏省电力有限公司电力科学研究院 | Beidou navigation system interference source direct positioning method based on propagation operator |
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| US5572219A (en) * | 1995-07-07 | 1996-11-05 | General Electric Company | Method and apparatus for remotely calibrating a phased array system used for satellite communication |
| US5771439A (en) * | 1996-05-20 | 1998-06-23 | Raytheon E-Systems, Inc. | Adaptive antenna system and method for cellular and personal communication systems |
| KR100229094B1 (en) * | 1996-06-28 | 1999-11-01 | 최승원 | Signal processing method of array antenna using eigenvector corresponding to maximum eigen value |
| US6111816A (en) * | 1997-02-03 | 2000-08-29 | Teratech Corporation | Multi-dimensional beamforming device |
| US6108564A (en) * | 1997-12-31 | 2000-08-22 | Lucent Technologies, Inc. | Interference rejection by means of null-space transformations |
| US5926135A (en) * | 1998-01-08 | 1999-07-20 | Lucent Technologies | Steerable nulling of wideband interference signals |
| US6975666B2 (en) * | 1999-12-23 | 2005-12-13 | Institut National De La Recherche Scientifique | Interference suppression in CDMA systems |
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-
2005
- 2005-08-12 US US11/202,182 patent/US7420509B2/en active Active
-
2006
- 2006-08-01 CA CA2555106A patent/CA2555106C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8754810B2 (en) | 2009-02-02 | 2014-06-17 | Commonwealth Scientific And Industrial Research Organisation | Hybrid adaptive antenna array |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080007454A1 (en) | 2008-01-10 |
| US7420509B2 (en) | 2008-09-02 |
| CA2555106C (en) | 2011-10-11 |
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