Advanced signal processors for interference cancellation in baseband receivers
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-003/20
H03D-001/04
출원번호
US-0892874
(2010-09-28)
등록번호
US-8654689
(2014-02-18)
발명자
/ 주소
McCloud, Michael L.
Nagarajan, Vijay
출원인 / 주소
Rambus Inc.
대리인 / 주소
Barcelo, Harrison & Walker LLP
인용정보
피인용 횟수 :
10인용 특허 :
192
초록▼
An interference canceller comprises a composite interference vector (CIV) generator configured to produce a CIV by combining soft and/or hard estimates of interference, an interference-cancelling operator configured for generating a soft projection operator, and a soft-projection canceller configure
An interference canceller comprises a composite interference vector (CIV) generator configured to produce a CIV by combining soft and/or hard estimates of interference, an interference-cancelling operator configured for generating a soft projection operator, and a soft-projection canceller configured for performing a soft projection of the received baseband signal to output an interference-cancelled signal. Weights used in the soft-projection operator are selected to maximize a post-processing SINR.
대표청구항▼
1. A method for cancelling interference from a received baseband signal in a CDMA system, comprising: generating at least one composite interference vector (CIV) by combining estimates from interfering subchannels,generating a soft-cancellation operator, andperforming a soft cancellation of the rece
1. A method for cancelling interference from a received baseband signal in a CDMA system, comprising: generating at least one composite interference vector (CIV) by combining estimates from interfering subchannels,generating a soft-cancellation operator, andperforming a soft cancellation of the received baseband signal to output an interference-cancelled signal,wherein the estimates are derived from a Rake receiver. 2. The method recited in claim 1, wherein each finger of the Rake receiver is matched to at least one of a time delay and a base station spreading code. 3. The method recited in claim 1, wherein generating at least one CIV comprises generating at least one of soft estimates and hard estimates from the interfering subchannels. 4. The method recited in claim 1, wherein generating at least one CIV comprises generating at least one or more soft estimates corresponding to interfering user subchannels from each base station tracked by a cellular handset. 5. The method recited in claim 1, wherein the at least one of soft estimates and hard estimates is derived from a selected one of a Rake receiver, an equalizer, and a detector matched to the communication protocol and channel conditions of the received baseband signal. 6. The method recited in claim 1, wherein the at least one CIV is generated using at least one of a symbol estimator, a sub channel selector, a fast Walsh transform, and a PN coder. 7. The method recited in claim 6, wherein the at least one CIV is generated using a symbol estimator employing at least one of Rake processing, receive diversity and equalization. 8. The method recited in claim 1, wherein performing a soft cancellation comprises at least one of subtractive and projective interference cancellation. 9. The method recited in claim 1, wherein the soft cancellation operator comprises a soft-projection matrix generator or an interference-cancelling operator configured for selecting a soft weight that increases a post-processing SINR. 10. The method recited in claim 1, wherein the received baseband signal is coupled to a first Rake finger and generating the at least one CIV comprises generating the at least one CIV from at least one Rake finger that does not include the first Rake finger. 11. The method recited in claim 1, wherein generating the at least one CIV comprises deriving the estimates from at least one of a Rake receiver, an equalizer, a receiver employing receive diversity, a receiver employing transmit diversity combining, and a receiver employing space-time decoding. 12. The method recited in claim 1, wherein generating the soft-cancellation operator comprises generating a soft-projection matrix to operate on a received data vector, the soft-projection matrix having the form F(λ)=I−λss*, where I is an identity matrix, λ is a weight, and s is a CIV. 13. The method recited in claim 12, wherein generating the soft-cancellation operator comprises determining the weight λ by maximizing a post-processing SINR. 14. The method recited in claim 13, wherein generating the soft-cancellation operator comprises determining the weight λ by maximizing a post-processing SINR for a handset operating in a soft-handoff mode. 15. The method recited in claim 1, wherein performing the soft cancellation further comprises coupling the interference-cancelled signal to at least one of a combiner and a Rake receiver. 16. The method recited in claim 15, further comprising combining a plurality of interference-cancelled signals. 17. The method recited in claim 1, wherein the CDMA system is configured to implement receive diversity and equalization.
Kim, Seong Rag; Kang, Sugbong; Choi, In Kyeong; Lee, Jeong Goo, Apparatus and method of adaptive weighted parallel interference cancellation system for CDMA.
Chiba Isamu (Nara JPX) Fujise Masayuki (Nara JPX), Apparatus for controlling array antenna comprising a plurality of antenna elements and method therefor.
Zhodzishsky Mark I.,RUX ; Vorobiev Michail Y.,RUX ; Prasolov Victor A.,RUX ; Ashjaee Javad, Apparatuses and methods of suppressing a narrow-band interference with a compensator and adjustment loops.
Dogan Mithat Can ; Stearns Stephen Deane, Communication apparatus for transmitting and receiving signals over a fiber-optic waveguide using different frequency bands of light.
Visotsky Yevgeny ; Frank Colin D. ; Madhow Upamanyu ; Singh Rahul, Communication device and method for interference suppression using adaptive equalization in a spread spectrum communication system.
Tsujimoto Ichiro (Tokyo JPX), Decision feedback equalizer including forward part whose signal reference point is shiftable depending on channel respon.
Cochran Bruce A. (Mesa AZ) Liebetreu John M. (Scottsdale AZ) McCallister Ronald D. (Scottsdale AZ), Demodulator with selectable coherent and differential data.
Cochran Bruce A. (Mesa AZ) McCallister Ronald D. (Scottsdale AZ) Garvey Brendan J. (Scottsdale AZ), Differential/coherent digital demodulator operating at multiple symbol points.
Janc Robert V. (Palos Heights IL) Jasper Steven C. (Hoffman Estates IL) Longley Lester A. (Chicago IL) Zebrose Katherine L. (Chicago IL) Turney William J. (Schaumburg IL) Lillie Ross J. (Schaumburg I, Digital radio frequency receiver.
Mohamed Moataz A., Digital signal processor configuration including multiplying units coupled to plural accumlators for enhanced parallel mac processing.
Gilhousen Klein S. (San Diego CA) Padovani Roberto (San Diego CA) Wheatly ; III Charles E. (Del Mar CA), Diversity receiver in a CDMA cellular telephone system.
Dean Richard F. (Boulder CO) Antonio Franklin P. (Del Mar CA) Gilhousen Klein S. (Bozeman MT) Wheatley ; III Charles E. (Del Mar CA), Dual distributed antenna system.
Dean Richard F. (Escondido CA) Antonio Franklin P. (Del Mar CA) Gilhousen Klein S. (Bozeman MT) Wheatley ; III Charles E. (Del Mar CA), Dual distributed antenna system.
Upadhyay Triveni N. ; VanderVelde Wallace E. ; Falcone Kenneth A., Integrated adaptive spatial-temporal system for controlling narrowband and wideband sources of interferences in spread spectrum CDMA receivers.
van Heeswyk Frank Martin,CAX ; Newson Paul,CAX, Interference cancellation system and method and CDMA receiver including an interference cancellation circuit.
Tanaka Yoshinori,JPX ; Kobayakawa Shuji,JPX ; Seki Hiroyuki,JPX ; Toda Takeshi,JPX ; Tsutsui Masafumi,JPX, Interference canceller equipment and interference cancelling method for use in a multibeam-antenna communication system.
Young Shane Michael Joseph,CAX ; Bongfeldt David Charles,CAX, Interference canceller for the protection of direct-sequence spread-spectrum communications from high-power narrowband interference.
Frank, Colin D.; Visotsky, Eugene; Choudhary, Prashant; Ghosh, Amitava, Linear minimum mean square error equalization with interference cancellation for mobile communication forward links utilizing orthogonal codes covered by long pseudorandom spreading codes.
Nir Joseph,ILX ; Shayevich Baruch,ILX ; Cohen Hanoch,ILX ; Perelmuter Oleg,ILX, Locating a mobile unit using signals from both mobile beacons and stationary beacons.
Bottomley,Gregory E.; Cozzo,Carmela; Khayrallah,Ali S.; Moelker,Dignus Jan, Method and apparatus for combining weight computation in a DS-CDMA RAKE receiver.
Rademacher Leo,DEX ; Gardijan Zoran,DEX, Method and apparatus for detecting items of information transmitted according to the DS-CDMA principle in a receiver apparatus.
Narayan, Anand P.; Olson, Eric S.; Jain, Prashant; Thomas, John K., Method and apparatus for interference suppression with efficient matrix inversion in a DS-CDMA system.
Olson,Eric S.; Narayan,Anand P.; Jain,Prashant; Thomas,John K., Method and apparatus for interference suppression with efficient matrix inversion in a DS-CDMA system.
Kidiyarova Shevchenko,Anna; Ottosson,Tony; Strom,Erik, Method and apparatus for multi-user detection using RSFQ successive interference cancellation in CDMA wireless systems.
Bertiger Bary Robert ; Corman David Warren ; Cook Dean Lawrence ; Maine Kristine Patricia ; Warble Keith Vaclav, Method and apparatus for providing duplex communication service in geographical areas where conventional services are o.
Arogyaswami J. Paulraj ; Peroor K. Sebastian ; Jose Tellado ; Robert W. Heath, Jr., Method and wireless communications system using coordinated transmission and training for interference mitigation.
Ranta Pekka,FIX ; Jolma Petri,FIX ; Gandini Giulio,FIX ; Honkasalo Zhichun,FIX, Method of allocating frequency bands to different cells, and TDMA cellular radio system.
Roy ; III Richard H. (Cupertino CA) Paulraj Arogyaswami J. (Bangalore CA INX) Kailath Thomas (Stanford CA), Methods and arrangements for signal reception and parameter estimation.
Hafeez Abdulrauf ; Molnar Karl J. ; Bottomley Gregory E., Methods and systems for reducing co-channel interference using multiple timings for a received signal.
Misra, Raj Mani; Zeira, Ariela; Pan, Jung-Lin, Multi-user detection using an adaptive combination of joint detection and successive interface cancellation.
Zeger Andrew E. (Wyndmoor PA) Abrams Burton S. (Wyndmoor PA), Multiple signal receiver for direct sequence, code division multiple access, spread spectrum signals.
Divsalar Dariush (Pacific Pallisades CA) Simon Marvin K. (La Canada CA) Raphaeli Dan (Tel Aviv ILX), Parallel interference cancellation for CDMA applications.
Fenton Patrick (Calgary CA CAX) Van Dierendonck Albert J. (Los Altos CA), Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s.
Ichikawa Toshihito (Saitama JPX) Kasa Koichi (Saitama JPX) Akiyama Kiichiro (Saitama JPX), Radio receiver having switch for switching between a wide filter and a narrow filter.
Wang, Yi-Pin Eric; Ottosson, Tony; Bottomley, Gregory Edward, Rake combining methods and apparatus using weighting factors derived from knowledge of spreading spectrum signal characteristics.
La Rosa Christopher P. ; Carney Michael J. ; Becker Christopher J. ; Eberhardt Michael A. ; Frank Colin D. ; Rasky Phillip D., Rake receiver and finger management method for spread spectrum communication.
Choi Seung Won,KRX ; Yun Dong Un,KRX, Signal processing apparatus and method for reducing the effects of interference and noise in wireless communication systems.
Fuyun Ling ; Nagabhushana T. Sindhushayana ; Eduardo A. S. Esteves, System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation.
Ling, Fuyun; Sindhushayana, Nagabhushana T.; Esteves, Eduardo A. S., System and method for performing accurate demodulation of turbo-encoded signals via pilot assisted coherent demodulation.
Sindhushayana, Nagabhushana T.; Esteves, Eduardo A. S., System and method for providing an accurate estimation of received signal interference for use in wireless communications systems.
Kannan Krishnamurthi (Yorktown Heights NY) Jones Christopher D. (Georgetown KY) Lee Nathan J. (New City NY) Leontiades Kyriakos (Boca Raton FL) Novak Frank P. (Park Ridge NJ) Sharma Vikram (Pleasantv, System for distributed power management in portable computers.
Halpern Peter H. (118 Old Hickory Ct. Longwood FL 32750) Mallory Peter E. (406 N. Riverside Dr. Edgewater FL 32032) Haug Paul E. (5851 Michelle La. Sanford FL 32771) Koos ; Jr. William M. (548 Lake A, System for transmitting data through a troposcatter medium.
Bejjani Elie,FRX ; Bouquier Jean-Fran.cedilla.ois,FRX ; de Cacqueray Benoit,FRX, To a telecommunication system using code division multiple access (CDMA).
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