WO2005053175A1 - Suppression of unwanted signal elements by sinusoidal amplitude windowing - Google Patents
Suppression of unwanted signal elements by sinusoidal amplitude windowing Download PDFInfo
- Publication number
- WO2005053175A1 WO2005053175A1 PCT/GB2004/004921 GB2004004921W WO2005053175A1 WO 2005053175 A1 WO2005053175 A1 WO 2005053175A1 GB 2004004921 W GB2004004921 W GB 2004004921W WO 2005053175 A1 WO2005053175 A1 WO 2005053175A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- elements
- window function
- unwanted
- unwanted signal
- 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
- H01Q3/267—Phased-array testing or checking devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0608—Detectors therefor, e.g. correlators, state machines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2623—Reduction thereof by clipping
- H04L27/2624—Reduction thereof by clipping by soft clipping
Definitions
- the present invention relates to a method for processing a signal containing interference and, in particular, to a method for processing a signal containing bursts of regular or quasi-regular interference.
- effects arising from certain types of interference burst contained within the signal cannot be removed entirely unless each of the bursts can be substituted by an accurate estimate of the original signal waveform in the corresponding regions of the signal. This may be possible to an acceptable degree of precision when a wanted signal is strong and not corrupted by noise, but in the case where the wanted signal is weak and not visible above the level of the noise or of other unwanted signals, substitution cannot necessarily be performed.
- a method for processing a signal containing regular or quasi-regular elements of unwanted signal comprising the steps of:
- the method further comprises the steps of:
- step (iv) applying a Fourier transform or similar spectral analysis process to the signal output from step (iii); and (v) applying an algorithm to restore the shape of spectral peaks in the transformed signal to an approximation of their form in the absence of said unwanted signal elements.
- a sinusoidal windowing function is that although spectral peaks in the transformed signal tend to be split into sub-peaks as a result of the modulation applied by the windowing function, only two sub- peaks are created of equal amplitude are created. It is then a simple task to recombine such peak pairs in frequency and amplitude and restore them to a close approximation of signal spectrum that would have been expected in the absence of the application of the windowing function.
- Figure 1 is a flow diagram showing the steps in a signal interference reduction process according to a preferred embodiment of the present invention
- Figure 2 is a representation of a portion of a test signal containing one burst of interference
- Figure 3 is a representation of the signal of Figure 2 following application of a windowing function generated according to a preferred embodiment of the present invention
- Figure 4 is a representation of a received signal portion following application of a fast Fourier transform
- Figure 5 is a representation of the result of applying an FFT to the same signal as used to generate Figure 2, but to which a windowing function, generated according to preferred embodiments of the present invention, has been applied prior to application of the FFT.
- the first task, at STEP 105, is to establish the locations of the interference bursts contained in the received signal. It may be that the source of interference is unknown and hence the only information available on the timing of the interference bursts is that derivable from an analysis of the signal. However, if the interference source is knowD, then a certain amount of such information may be extracted from a knowledge of the source. For example, in mobile communications systems such one conforming to the Global System for Mobile (GSM) standards, while signals generally comprise modulated sequences of symbols with a pseudo-random structure, at predefined intervals bursts of signal may be inserted for particular purposes such as frequency correction or synchronisation.
- GSM Global System for Mobile
- Such bursts may not contain sequences of symbols with the pseudo-random properties encountered in the majority of the signal. If the signal is being processed using, for example correlation techniques, which depend for their effectiveness on the general pseudo-randomness of the symbol stream, the occurrence of such bursts can generate interference effects of the type addressed by this invention. However, the structure and formatting of such interference-generating signal bursts are defined in the signal standards and well known procedures exist for the location of such bursts in received signals of this type. Having established the locations of the interference bursts in the received signal, the next step, STEP 110, is to generate a time domain window function based upon the timing information established at STEP 105.
- this window function is to effect a preferential reduction in the amplitude of the received signal in the regions of the interference bursts.
- a sinusoidal window function is generated having zero crossings arranged to coincide with the mid-points of the interference bursts.
- other types of window function may be used as would be apparent to a person of ordinary skill in the field of signal processing. Having generated an appropriate window function at STEP 110 for at least a portion of the received signal then, at STEP 115, the window function is aligned with and applied to the received signal, essentially by multiplication of signal by the window function. In the case of the example signal shown in Figure 2, the result of applying a sinusoidal window function to that signal is shown in Figure 3.
- the received signal has taken on a sinusoidal amplitude weighting in which the region of signal having the interference burst 200 has been reduced in amplitude, locally to zero at the centre point of the burst.
- This process is mathematically equivalent to the application of suppressed carrier double sideband amplitude modulation to the signal, and is responsible for the peak splitting effect in the spectra of signals to which such windowing has been applied.
- a fast Fourier transform (FFT) is applied to the resultant signal from STEP 115. If, as discussed above in the example of figures 4 and 5, peaks in the transformed signal have been split into two sub-peaks, then at STEP 125, a simple algorithm may be executed to restore the peaks to an approximation of their original form, for example through the use of standard modulation theory for the analysis of the effect of applying a defined amplitude weighting to a signal and knowledge of the frequency of that signal, obtained from the known repetition rate of the interference bursts on the original signal. It will be appreciated that the invention has been described by way of example only and that variation to the above described embodiments may be made without departing form the scope of the invention.
- FFT fast Fourier transform
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/521,745 US8085886B2 (en) | 2003-11-21 | 2004-11-19 | Supression of unwanted signal elements by sinusoidal amplitude windowing |
AU2004310544A AU2004310544B2 (en) | 2003-11-21 | 2004-11-19 | Suppression of unwanted signal elements by sinusoidal amplitude windowing |
ES04798631T ES2435517T3 (en) | 2003-11-21 | 2004-11-19 | Suppression of parasitic or unwanted signal elements by function of sinusoidal amplitude windows |
EP04798631.0A EP1685654B1 (en) | 2003-11-21 | 2004-11-19 | Suppression of unwanted signal elements by sinusoidal amplitude windowing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0327041.0 | 2003-11-21 | ||
GBGB0327041.0A GB0327041D0 (en) | 2003-11-21 | 2003-11-21 | Apparatus and methods |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005053175A1 true WO2005053175A1 (en) | 2005-06-09 |
Family
ID=29764162
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2004/004905 WO2005053191A1 (en) | 2003-11-21 | 2004-11-19 | Enhancing signals |
PCT/GB2004/004910 WO2005053174A1 (en) | 2003-11-21 | 2004-11-19 | Signal regeneration |
PCT/GB2004/004901 WO2005053190A1 (en) | 2003-11-21 | 2004-11-19 | Signal interference measurement |
PCT/GB2004/004896 WO2005053094A1 (en) | 2003-11-21 | 2004-11-19 | Wideband antenna and receiver calibration |
PCT/GB2004/004921 WO2005053175A1 (en) | 2003-11-21 | 2004-11-19 | Suppression of unwanted signal elements by sinusoidal amplitude windowing |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2004/004905 WO2005053191A1 (en) | 2003-11-21 | 2004-11-19 | Enhancing signals |
PCT/GB2004/004910 WO2005053174A1 (en) | 2003-11-21 | 2004-11-19 | Signal regeneration |
PCT/GB2004/004901 WO2005053190A1 (en) | 2003-11-21 | 2004-11-19 | Signal interference measurement |
PCT/GB2004/004896 WO2005053094A1 (en) | 2003-11-21 | 2004-11-19 | Wideband antenna and receiver calibration |
Country Status (8)
Country | Link |
---|---|
US (5) | US7606337B2 (en) |
EP (5) | EP1685665B1 (en) |
AT (3) | ATE486418T1 (en) |
AU (5) | AU2004310536B2 (en) |
DE (3) | DE602004006530T2 (en) |
ES (4) | ES2353080T3 (en) |
GB (1) | GB0327041D0 (en) |
WO (5) | WO2005053191A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070118361A1 (en) * | 2005-10-07 | 2007-05-24 | Deepen Sinha | Window apparatus and method |
US8064901B2 (en) * | 2005-11-16 | 2011-11-22 | Telefonaktiebolaget L M Ericsson (Publ) | Expert system |
US8369809B2 (en) * | 2007-07-27 | 2013-02-05 | Netlogic Microsystems, Inc. | Crest factor reduction |
US20100182191A1 (en) * | 2007-10-12 | 2010-07-22 | Bae Systems Plc | Receiver equalisation |
CN102119482A (en) * | 2008-06-11 | 2011-07-06 | 奥普蒂科伦公司 | Crest factor reduction with phase optimization |
GB2467773B (en) * | 2009-02-13 | 2012-02-01 | Socowave Technologies Ltd | Communication system, apparatus and methods for calibrating an antenna array |
JP5620757B2 (en) * | 2010-09-01 | 2014-11-05 | 株式会社豊田中央研究所 | Radar equipment |
CN104205659A (en) * | 2011-10-21 | 2014-12-10 | 奥普蒂斯蜂窝技术有限责任公司 | Methods, processing device, computer programs, computer program products and antenna apparatus for calibration of antenna apparatus |
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WO2016089143A1 (en) * | 2014-12-05 | 2016-06-09 | 엘지전자 주식회사 | Method for performing uplink transmission on subframe to which reduced cp is applied and user device |
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ES2895680T3 (en) * | 2017-11-07 | 2022-02-22 | Siemens Ag | Procedure for the synchronization of transmitting and receiving units in a multicarrier signal transmission |
US10734721B2 (en) | 2017-11-13 | 2020-08-04 | Loon Llc | Beamforming calibration |
EP3711199B1 (en) * | 2017-11-13 | 2022-10-19 | SoftBank Corp. | Beamforming calibration |
US10361762B2 (en) | 2017-12-06 | 2019-07-23 | Space Systems/Loral, Llc | Calibration of satellite beamforming channels |
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US10284308B1 (en) | 2017-12-06 | 2019-05-07 | Space Systems/Loral, Llc | Satellite system calibration in active operational channels |
US10218548B1 (en) | 2018-01-24 | 2019-02-26 | National Instruments Corporation | Wireless radio receiver that performs adaptive phase tracking |
US10218549B1 (en) * | 2018-01-24 | 2019-02-26 | National Instruments Corporation | Wireless radio receiver that performs adaptive phase tracking |
KR102457566B1 (en) * | 2018-02-22 | 2022-10-21 | 한국전자통신연구원 | Modem performing modulation or demodulation based on length of burst in a data packet and a method performed by the modem |
US10782331B2 (en) * | 2018-06-21 | 2020-09-22 | Rohde & Schwarz Gmbh & Co. Kg | Power measurement apparatus |
EP3790111B1 (en) | 2018-07-06 | 2022-03-02 | Huawei Technologies Co., Ltd. | Method for calibrating phased-array antenna, and related apparatus |
JP7231828B2 (en) * | 2019-04-26 | 2023-03-02 | 日本電信電話株式会社 | INTERFERENCE WAVE CALCULATION METHOD, INTERFERENCE WAVE COMPUTER AND COMPUTER PROGRAM |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5287387A (en) * | 1992-03-06 | 1994-02-15 | Motorola, Inc. | Low splatter peak-to-average signal reduction |
EP1069693A2 (en) * | 1999-07-15 | 2001-01-17 | Mitsubishi Denki Kabushiki Kaisha | Noise reduction apparatus and audio output apparatus |
US20020176480A1 (en) * | 2001-05-22 | 2002-11-28 | Wheatley Charles E. | Method and apparatus for peak-to-average power reduction |
Family Cites Families (67)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3754101A (en) * | 1971-07-02 | 1973-08-21 | Universal Signal Corp | Frequency rate communication system |
DE2228069C3 (en) * | 1972-06-09 | 1979-07-26 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Method and device for suppressing interference in frequency-modulated signals |
JPS52136527A (en) | 1976-05-10 | 1977-11-15 | Matsushita Electric Ind Co Ltd | Color demodulator |
US4525676A (en) * | 1981-02-24 | 1985-06-25 | Nippon Electric Co., Ltd. | PSK Demodulation system having carrier frequency variation compensation |
US4706174A (en) * | 1982-07-29 | 1987-11-10 | Eaton Corporation | Single phase to multiphase frequency multiplier |
SE460086B (en) * | 1987-11-27 | 1989-09-04 | Ericsson Telefon Ab L M | DEVICE FOR CORRECTING THE FREQUENCY OF A COHERENT RECEIVER |
US5109417A (en) * | 1989-01-27 | 1992-04-28 | Dolby Laboratories Licensing Corporation | Low bit rate transform coder, decoder, and encoder/decoder for high-quality audio |
US5440285A (en) * | 1991-04-22 | 1995-08-08 | Omron Corporation | Closed type electromagnetic relay |
US5390216A (en) * | 1991-11-02 | 1995-02-14 | Robert Bosch Gmbh | Synchronization method for a mobile radiotelephone |
US5367257A (en) * | 1992-05-14 | 1994-11-22 | Garshelis Ivan J | Non-contact, magnetic sensor for determining direction of motion and velocity of a movable member |
US5276706A (en) * | 1992-05-20 | 1994-01-04 | Hughes Aircraft Company | System and method for minimizing frequency offsets between digital communication stations |
US5357257A (en) * | 1993-04-05 | 1994-10-18 | General Electric Company | Apparatus and method for equalizing channels in a multi-channel communication system |
US5442593A (en) * | 1993-04-16 | 1995-08-15 | The Charles Stark Draper Laboratory, Inc. | Apparatus and method of nulling discrete frequency noise signals |
US5490173A (en) * | 1993-07-02 | 1996-02-06 | Ford Motor Company | Multi-stage digital RF translator |
FR2710805B1 (en) | 1993-09-29 | 1995-11-10 | Alcatel Mobile Comm France | Filling burst structure in a digital cellular radio system using the principle of TDMA, and base station for the development of such a structure. |
JP3337795B2 (en) | 1993-12-10 | 2002-10-21 | 富士通株式会社 | Relay device |
US6157343A (en) * | 1996-09-09 | 2000-12-05 | Telefonaktiebolaget Lm Ericsson | Antenna array calibration |
GB2291300B (en) | 1994-06-20 | 1997-12-17 | Motorola Ltd | Communications system |
ZA955605B (en) | 1994-07-13 | 1996-04-10 | Qualcomm Inc | System and method for simulating user interference received by subscriber units in a spread spectrum communication network |
US5440265A (en) * | 1994-09-14 | 1995-08-08 | Sicom, Inc. | Differential/coherent digital demodulator operating at multiple symbol points |
US5959580A (en) * | 1994-11-03 | 1999-09-28 | Ksi Inc. | Communications localization system |
US6101399A (en) * | 1995-02-22 | 2000-08-08 | The Board Of Trustees Of The Leland Stanford Jr. University | Adaptive beam forming for transmitter operation in a wireless communication system |
JP3272940B2 (en) * | 1996-03-07 | 2002-04-08 | ケイディーディーアイ株式会社 | Spread spectrum signal demodulator |
GB2311697B (en) | 1996-03-22 | 1999-07-28 | Matsushita Electric Ind Co Ltd | Wireless communication system and method and system for detection of position of radio mobile station |
US5974087A (en) | 1996-04-12 | 1999-10-26 | Advantest Corporation | Waveform quality measuring method and apparatus |
US6047192A (en) * | 1996-05-13 | 2000-04-04 | Ksi Inc. | Robust, efficient, localization system |
US5850218A (en) * | 1997-02-19 | 1998-12-15 | Time Warner Entertainment Company L.P. | Inter-active program guide with default selection control |
AU6312298A (en) * | 1997-03-18 | 1998-10-12 | Matsushita Electric Industrial Co., Ltd. | Calibration device for array antenna wireless receiver |
US20030186725A1 (en) * | 1997-03-18 | 2003-10-02 | Matsushita Electric Industrial Co., Ltd. | Calibration apparatus for array antenna radio receiving apparatus |
IT1293059B1 (en) | 1997-06-24 | 1999-02-11 | Space Engineering Spa | DIGITAL BI-STATIC RADAR WITH EXPANDED SPECTRUM |
FR2766320B1 (en) * | 1997-07-15 | 1999-10-15 | Thomson Csf | METHOD AND DEVICE FOR ANALYZING INTERFERENCE IN A CELLULAR RADIO COMMUNICATION SYSTEM |
EP1662672B1 (en) | 1998-01-22 | 2009-12-02 | BRITISH TELECOMMUNICATIONS public limited company | Receiving spread spectrum signals with narrowband interference |
EP0964530A1 (en) * | 1998-06-05 | 1999-12-15 | Siemens Aktiengesellschaft | Radio communications receiver and interference cancellation method |
US6577686B1 (en) * | 1998-10-13 | 2003-06-10 | Matsushita Electric Industrial Co., Ltd. | Receiver |
DE69814081T2 (en) * | 1998-10-19 | 2004-03-18 | Lucent Technologies Inc. | Iterative time estimation for GSM bursts |
US6373878B1 (en) | 1998-11-02 | 2002-04-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Using a fast AGC as part of SIR calculation |
US6240290B1 (en) * | 1999-03-04 | 2001-05-29 | Harris Corporation | Base station hand-off mechanism for cellular communication system |
GB2347831B (en) * | 1999-03-06 | 2004-07-07 | Nec Technologies | Sychronisation in digital data transmission systems |
EP1085676B1 (en) * | 1999-09-16 | 2014-10-22 | Alcatel Lucent | Method of controlling power in a point to multipoint communication network and system for carrying out said method |
AU7653500A (en) | 1999-10-13 | 2001-04-23 | Koninklijke Kpn N.V. | Method and system for finding the position of mobile terminals |
US6597730B1 (en) * | 1999-11-03 | 2003-07-22 | Northrop Grumman Corporation | Satellite communication array transceiver |
JP3557969B2 (en) * | 1999-11-24 | 2004-08-25 | 日本電気株式会社 | Wireless receiver and calibration method |
FR2802371B1 (en) * | 1999-12-10 | 2003-09-26 | Matra Nortel Communications | SIGNALING METHOD IN A RADIO COMMUNICATION SYSTEM, TRANSMITTERS, RECEIVERS AND REPEATERS FOR IMPLEMENTING THE METHOD |
US6628735B1 (en) * | 1999-12-22 | 2003-09-30 | Thomson Licensing S.A. | Correction of a sampling frequency offset in an orthogonal frequency division multiplexing system |
US7027424B1 (en) * | 2000-05-24 | 2006-04-11 | Vtech Communications, Ltd. | Method for avoiding interference in a digital communication system |
JP3424659B2 (en) * | 2000-06-02 | 2003-07-07 | 日本電気株式会社 | Multi-beam receiver |
DE60126080T2 (en) * | 2000-06-09 | 2007-06-06 | Aware, Inc., Bedford | REDUCTION OF RADIO FREQUENCY TRANSITIONS IN MULTI-TRANSMISSION TRANSMISSIONS |
US6931292B1 (en) * | 2000-06-19 | 2005-08-16 | Jabra Corporation | Noise reduction method and apparatus |
KR100338661B1 (en) * | 2000-08-18 | 2002-07-13 | 윤종용 | Apparatus and method for managing dormant state in a wireless packet data system |
EP1317831A2 (en) * | 2000-09-12 | 2003-06-11 | Siemens Aktiengesellschaft | Method and orthogonal frequency division multiplexing (ofdm) receiver for reducing the influence of harmonic interferences on ofdm transmission systems |
US6369758B1 (en) * | 2000-11-01 | 2002-04-09 | Unique Broadband Systems, Inc. | Adaptive antenna array for mobile communication |
KR100838902B1 (en) * | 2000-11-29 | 2008-06-16 | 소니 가부시끼 가이샤 | Stream processor |
WO2002051044A1 (en) * | 2000-12-20 | 2002-06-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for classifying interference |
AU2002340719B2 (en) | 2001-05-04 | 2007-06-28 | Lockheed Martin Corporation | System and method for narrowband pre-detection signal processing for passive coherent location applications |
FI20011342A0 (en) * | 2001-06-25 | 2001-06-25 | Nokia Corp | Method and device for obtaining information |
US6876859B2 (en) * | 2001-07-18 | 2005-04-05 | Trueposition, Inc. | Method for estimating TDOA and FDOA in a wireless location system |
US6909277B2 (en) * | 2002-03-13 | 2005-06-21 | Caterpillar Inc | Amplification circuit for increasing variable reluctance sensor output |
ES2198207B2 (en) * | 2002-04-12 | 2004-09-16 | Telefonica, S.A. | GSM REPEATER SYSTEM WITH SPECTRAL EXCHANGE BETWEEN GSM FREQUENCY BANDS OF 900 AND 1800 MHZ, AS WELL AS ACCESS METHOD. |
US7158542B1 (en) | 2002-05-03 | 2007-01-02 | Atheros Communications, Inc. | Dynamic preamble detection |
US7013113B2 (en) * | 2002-07-25 | 2006-03-14 | Pctel Maryland, Inc. | Method and apparatus for co-channel interference measurements and interference component separation based on statistical signal processing in drive-test area |
GB2395095A (en) * | 2002-10-30 | 2004-05-12 | Nokia Corp | Reducing noise in a multi-carrier signal |
US7187736B2 (en) | 2003-02-13 | 2007-03-06 | Motorola Inc. | Reducing interference in a GSM communication system |
KR100943272B1 (en) * | 2003-02-18 | 2010-02-23 | 삼성전자주식회사 | Digital communication system having channel estimation device and a method channel estimating thereof |
US6954707B2 (en) * | 2003-02-18 | 2005-10-11 | Tektronix, Inc. | Multiple sinusoidal burst frequency measurements |
US20050073947A1 (en) * | 2003-10-02 | 2005-04-07 | Texas Instruments Incorporated | Channel estimator for a receiver and method of operation thereof |
EP1695583B1 (en) * | 2003-12-18 | 2014-08-13 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | A method and apparatus for determining the content of bursts to be transmitted from a base station |
US7474718B2 (en) * | 2003-12-30 | 2009-01-06 | Nokia Corporation | Frequency control for a mobile communications device |
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2003
- 2003-11-21 GB GBGB0327041.0A patent/GB0327041D0/en not_active Ceased
-
2004
- 2004-11-19 AU AU2004310536A patent/AU2004310536B2/en not_active Ceased
- 2004-11-19 ES ES04798616T patent/ES2353080T3/en active Active
- 2004-11-19 DE DE602004006530T patent/DE602004006530T2/en active Active
- 2004-11-19 US US10/521,747 patent/US7606337B2/en active Active
- 2004-11-19 AT AT04798616T patent/ATE486418T1/en not_active IP Right Cessation
- 2004-11-19 AT AT04798621T patent/ATE362676T1/en not_active IP Right Cessation
- 2004-11-19 DE DE602004029808T patent/DE602004029808D1/en active Active
- 2004-11-19 AU AU2004310544A patent/AU2004310544B2/en not_active Ceased
- 2004-11-19 EP EP04798616A patent/EP1685665B1/en not_active Not-in-force
- 2004-11-19 US US10/521,744 patent/US20050272392A1/en not_active Abandoned
- 2004-11-19 AT AT04798612T patent/ATE476023T1/en not_active IP Right Cessation
- 2004-11-19 WO PCT/GB2004/004905 patent/WO2005053191A1/en not_active Application Discontinuation
- 2004-11-19 EP EP04798608A patent/EP1685623A1/en not_active Withdrawn
- 2004-11-19 AU AU2004310537A patent/AU2004310537B2/en not_active Ceased
- 2004-11-19 ES ES04798612T patent/ES2347932T3/en active Active
- 2004-11-19 WO PCT/GB2004/004910 patent/WO2005053174A1/en active IP Right Grant
- 2004-11-19 EP EP04798621A patent/EP1685653B1/en not_active Not-in-force
- 2004-11-19 ES ES04798621T patent/ES2286696T3/en active Active
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5287387A (en) * | 1992-03-06 | 1994-02-15 | Motorola, Inc. | Low splatter peak-to-average signal reduction |
EP1069693A2 (en) * | 1999-07-15 | 2001-01-17 | Mitsubishi Denki Kabushiki Kaisha | Noise reduction apparatus and audio output apparatus |
US20020176480A1 (en) * | 2001-05-22 | 2002-11-28 | Wheatley Charles E. | Method and apparatus for peak-to-average power reduction |
Non-Patent Citations (1)
Title |
---|
SAUL A: "ANALYSIS OF PEAK REDUCTION IN OFDM SYSTEMS BASED ON RECURSIVE CLIPPING", INTERNATIONAL OFDM WORKSHOP, vol. 1, 24 September 2003 (2003-09-24), HAMBURG, GERMANY, pages 103 - 107, XP008037944 * |
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