WO2009072934A1 - A method for interference rejection - Google Patents
A method for interference rejection Download PDFInfo
- Publication number
- WO2009072934A1 WO2009072934A1 PCT/SE2007/001079 SE2007001079W WO2009072934A1 WO 2009072934 A1 WO2009072934 A1 WO 2009072934A1 SE 2007001079 W SE2007001079 W SE 2007001079W WO 2009072934 A1 WO2009072934 A1 WO 2009072934A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weights
- pole
- antenna
- received
- certain
- Prior art date
Links
Classifications
-
- 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
-
- 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
Definitions
- the present invention relates to a method for identifying components in a telecommunication system, which method comprises the steps: representing a uniform linear array, ULA, antenna, having at least two antenna elements, by an array factor polynomial, the polynomial comprising at least two terms, each term having a certain weight and setting said weights to desired values such that a desired antenna radiation pattern corresponding to a desired array factor polynomial is acquired for the ULA antenna.
- one or more base station communicates with mobile stations such as mobile phones and laptops.
- a mobile station is modelled by a so-called cluster of local scatterers.
- This cluster is a collection of scatterers which are close to the transmitting mobile station, where the term "close” shall be interpreted as a distance which corresponds to a time which is much smaller than the symbol time.
- the scatterers constituting a cluster will, as their numbers grow, create a signal distribution, here termed azimuth spread.
- a receiving base station will receive signals from scatterers, producing angular dependent distributions of signals. Typically, such a distribution is termed Power Azimuth Spread (PAS).
- a specific direction may, for example, be comprised of disturbing signals, producing an angular dependent distribution of the transmitted signals.
- beam-forming is mainly dealing with focusing a gain function in a certain direction. This function is derived subject to a direction, in which some desired signal is presumed to be. An interfering signal may lay in a close neighborhood (azimuth) to the desired signal, causing problems.
- the object of the present invention is to disclose a simple and effective method for analyzing a channel in a telecommunication system, which in turn makes it possible to reduce interference, for example due to other transmitters.
- the method comprises the steps: changing the desired weights such that a number of sets of desired weights is acquired, such that the ULA antenna scans a spatial portion, a certain scan corresponding to a certain set of desired weights, and the number of scans at least being equal to the number of antenna elements in the ULA antenna; analyzing a received signal obtained from said scans, the received signal being represented by a received array factor polynomial comprising at least two terms, each term having a certain received weight, such that a received set of weights is acquired, the received set of weights being constituted by the desired set of weights scaled and rotated, the received array factor polynomial further being parameterized by at least one pole; and using each corresponding set of desired weights and received weights to determine the pole parameterization.
- the desired array factor polynomial is parameterized by at least two zeroes, where at least one zero is used for cancelling out a pole by altering the desired weights such that said zero is moved to said pole.
- each pole corresponds to a disturbance enabling each disturbance to be cancelled out by cancelling out its corresponding pole.
- the expression for the received signal in the spatial domain is derived by means of a least square method or a Fourier transform.
- Figure 4 shows a plot of a second set of antenna diagrams
- Figure 5 shows a flow-chart describing a preferred set of method step for carrying out the present invention.
- a disturbance may be modelled as an infinite array antenna.
- the disturbing second base station 2 may be represented by a spatial disturbance expression
- the received signal is referred to as an observed signal h o (n).
- the observed signal h o (n) is regarded as a multiplication between the array factor
- a disturbance modeled as a pole, is shown in Figure 2 as a x mark and the corresponding angular spectrum is the dashed curve 10 in Figure 3.
- the disturbance corresponds to the expression in equation (4).
- FIG 4 a flowchart for interference cancellation method is outlined.
- 0 15 First, disturbing signals, manifested by clusters, are identified using a pole model. 16: Then, with reference to Figure 2, distances d between zeroes and poles are calculated. The reason for this is that the zero closest to a pole in question shall be used to cancel, which actually is carried out in step 17 below.
- the cluster comprising disturbing signals may comprise any sources, where any cluster is a collection of scatterers which are close to the transmitting mobile station, where the term "close” shall be interpreted as a distance which corresponds to a time which is much smaller than the symbol time.
- There base stations used may be of any suitable kind, and may comprise several ULA antennas each, such that certain sectors are covered by the ULA antennas.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07861085A EP2218138A4 (en) | 2007-12-03 | 2007-12-03 | A method for interference rejection |
US12/745,801 US8249534B2 (en) | 2007-12-03 | 2007-12-03 | Method for interference rejection |
CN2007801018477A CN101884136B (en) | 2007-12-03 | 2007-12-03 | A method for interference rejection |
PCT/SE2007/001079 WO2009072934A1 (en) | 2007-12-03 | 2007-12-03 | A method for interference rejection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2007/001079 WO2009072934A1 (en) | 2007-12-03 | 2007-12-03 | A method for interference rejection |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009072934A1 true WO2009072934A1 (en) | 2009-06-11 |
Family
ID=40717939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2007/001079 WO2009072934A1 (en) | 2007-12-03 | 2007-12-03 | A method for interference rejection |
Country Status (4)
Country | Link |
---|---|
US (1) | US8249534B2 (en) |
EP (1) | EP2218138A4 (en) |
CN (1) | CN101884136B (en) |
WO (1) | WO2009072934A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103955602A (en) * | 2014-04-09 | 2014-07-30 | 华中科技大学 | Array factor molding method of synthesis aperture microwave radiometer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5542101A (en) * | 1993-11-19 | 1996-07-30 | At&T Corp. | Method and apparatus for receiving signals in a multi-path environment |
US20050123023A1 (en) * | 2003-12-03 | 2005-06-09 | Smith Stephen F. | Multicarrier orthogonal spread-spectrum (MOSS) data communications |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4862180A (en) * | 1985-06-12 | 1989-08-29 | Westinghouse Electric Corp. | Discrete source location by adaptive antenna techniques |
US7076227B1 (en) * | 1998-12-03 | 2006-07-11 | Apex/Eclipse Systems, Inc. | Receiving system with improved directivity and signal to noise ratio |
US20050159187A1 (en) * | 2002-03-18 | 2005-07-21 | Greg Mendolia | Antenna system and method |
JPWO2004064194A1 (en) * | 2003-01-08 | 2006-05-18 | 株式会社国際電気通信基礎技術研究所 | Array antenna control apparatus and array antenna apparatus |
CN101536356B (en) * | 2006-09-22 | 2012-11-21 | 意大利电信股份公司 | Method and system for syntesizing array antennas |
-
2007
- 2007-12-03 EP EP07861085A patent/EP2218138A4/en not_active Withdrawn
- 2007-12-03 CN CN2007801018477A patent/CN101884136B/en not_active Expired - Fee Related
- 2007-12-03 WO PCT/SE2007/001079 patent/WO2009072934A1/en active Application Filing
- 2007-12-03 US US12/745,801 patent/US8249534B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5542101A (en) * | 1993-11-19 | 1996-07-30 | At&T Corp. | Method and apparatus for receiving signals in a multi-path environment |
US20050123023A1 (en) * | 2003-12-03 | 2005-06-09 | Smith Stephen F. | Multicarrier orthogonal spread-spectrum (MOSS) data communications |
Non-Patent Citations (1)
Title |
---|
See also references of EP2218138A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP2218138A1 (en) | 2010-08-18 |
CN101884136B (en) | 2013-07-24 |
EP2218138A4 (en) | 2011-09-28 |
US8249534B2 (en) | 2012-08-21 |
CN101884136A (en) | 2010-11-10 |
US20100255804A1 (en) | 2010-10-07 |
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