Patents by Inventor Gregory Bottomley
Gregory Bottomley has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8761323Abstract: In a receive node of a wireless network, an iterative multi-user multi-stage interference cancellation receiver is used. After each stage of interference cancellation, interference characteristics change. An adaptive strategy is used in which after each stage of interference cancellation, impairment covariance is parametrically updated and combining weights of the receiver are adapted to reflect the updated impairment covariance.Type: GrantFiled: December 21, 2011Date of Patent: June 24, 2014Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Yi-Pin Eric Wang, Gregory Bottomley, Jung-Fu Cheng, Stephen Grant, Ning He, Niklas Johansson, Cagatay Konuskan
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Publication number: 20130077670Abstract: In a receive node of a wireless network, an iterative multi-user multi-stage interference cancellation receiver is used. After each stage of interference cancellation, interference characteristics change. An adaptive strategy is used in which after each stage of interference cancellation, impairment covariance is parametrically updated and combining weights of the receiver are adapted to reflect the updated impairment covariance.Type: ApplicationFiled: December 21, 2011Publication date: March 28, 2013Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Yi-Pin Eric Wang, Cagatay Konuskan, Gregory Bottomley, Jung-Fu Cheng, Niklas Johansson, Ning He, Stephen Grant
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Patent number: 8331510Abstract: A receiver and method are described herein that address inter-symbol interference in a received signal by using a two-stage equalizer which includes a first demodulation stage that processes the received signal and produces initial symbol decisions, and a non-linear equalization second stage that uses the received signal to perform a sequential search in an attempt to improve upon the initial symbol decisions where if able to improve upon the initial symbol decisions then an output sequence is obtained from the sequential search and if not able to improve upon the sequence metric threshold then the output sequence is the initial symbol decisions.Type: GrantFiled: April 6, 2009Date of Patent: December 11, 2012Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Ali Khayrallah, Gregory Bottomley
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Publication number: 20100254446Abstract: A receiver and method are described herein that address inter-symbol interference in a received signal by using a two-stage equalizer which includes a first demodulation stage that processes the received signal and produces initial symbol decisions, and a non-linear equalization second stage that uses the received signal to perform a sequential search in an attempt to improve upon the initial symbol decisions where if able to improve upon the initial symbol decisions then an output sequence is obtained from the sequential search and if not able to improve upon the sequence metric threshold then the output sequence is the initial symbol decisions.Type: ApplicationFiled: April 6, 2009Publication date: October 7, 2010Inventors: Ali Khayrallah, Gregory Bottomley
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Patent number: 7724813Abstract: According to method and apparatus embodiments taught herein, power control feedback is generated for a control channel signal that is received in conjunction with a reference channel signal based on the reference channel's signal strength or quality, and an estimate of a gain factor relating the control and reference channel signals. By way of non-limiting example set in a Wideband CDMA (WCDMA) context, the reference channel signal comprises a Common Pilot Channel (CPICH) signal and the control channel signal comprises a Fractional Dedicated Physical Channel (F-DPCH) signal that is transmitted at an (unknown) power gain relative to the CPICH signal.Type: GrantFiled: December 29, 2005Date of Patent: May 25, 2010Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Yi-Pin Eric Wang, Gregory Bottomley, Lennart Andersson
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Publication number: 20100027590Abstract: The present invention relates to a receiver comprising a fast power control unit, said fast power control unit being arranged to continuously control a quality measure of a radio channel. The receiver is characterized in that the quality measure is a modified Signal to Interference plus noise ratio (SIR) in which the influence from self interference has been removed. The invention further relates to a method for continuously controlling a quality measure of a radio channel, wherein a modified Signal to Interference plus noise ratio (SIR) is continuously determined in which the influence from self interference has been removed.Type: ApplicationFiled: November 7, 2006Publication date: February 4, 2010Inventors: Girum Alebachew, Carmela Cozzo, Gregory Bottomley, Fredrik Huss, Gunnar Peters
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Patent number: 7558533Abstract: A receiver is described herein that is capable of receiving and processing a radio signal and further capable of using interpolation to initialize receiver parameters when there is a change in at least one delay associated with the received radio signal or when there is at least one new correlator position. For instance, the receiver parameters that can be initialized include: (1) channel coefficients; (2) AFC parameters; (3) tracking parameters; (4) noise statistics (noise correlations); (5) signal statistics (channel coefficient correlations); (6) data statistics (despread values or chip samples); or (7) combining weights.Type: GrantFiled: November 7, 2007Date of Patent: July 7, 2009Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Carmela Cozzo, Gregory Bottomley, Rajaram Ramesh
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Patent number: 7443826Abstract: Code division multiple access signals received through at least one multipath propagation channel are processed to produce at least one relative frequency error estimate. This involves receiving and processing the signals using a local frequency reference oscillator to obtain representative complex numerical samples for processing. The complex numerical samples are correlated with shifts of a locally generated despreading code and a number of complex channel estimates are produced, each corresponding to a different delayed ray of the at least one multipath propagation channel. A frequency error estimate is computed for each ray based on successive values of a respective one of the channel estimates, and a weighted summation of the frequency error estimates is performed to provide at least one relative frequency error estimate.Type: GrantFiled: October 4, 2000Date of Patent: October 28, 2008Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Roozbeh Atarius, Gregory Bottomley, Paul W. Dent
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Publication number: 20080065711Abstract: A flexible Fast Walsh Transform circuit provides configurable FWT sizes, and is suitable for use in radio receivers where the received signal may be generated using varying spreading codes and/or varying numbers of multi-codes. Such signal types are commonly encountered in wireless communication systems like those based on the Wideband CDMA (W-CDMA) or IS-2000 (cdma2000) standards, and particularly with the higher data rate provisions of those standards. In one application, a RAKE receiver includes RAKE fingers that each include one of the flexible FWT circuits, such that each finger despreads the received signal using variably sized FWTs in accordance with the characteristics of the received signal. The flexibility in FWT sizing may derive from, for example, the inclusion of separately selectable but differently sized FWT circuits, or from the inclusion of a configurable FWT circuit capable of generating different sizes of FWTs.Type: ApplicationFiled: October 31, 2007Publication date: March 13, 2008Inventors: Gregory Bottomley, Ali Khayrallah
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Publication number: 20080063045Abstract: A receiver is described herein that is capable of receiving and processing a radio signal and further capable of using interpolation to initialize receiver parameters when there is a change in at least one delay associated with the received radio signal or when there is at least one new correlator position. For instance, the receiver parameters that can be initialized include: (1) channel coefficients; (2) AFC parameters; (3) tracking parameters; (4) noise statistics (noise correlations); (5) signal statistics (channel coefficient correlations); (6) data statistics (despread values or chip samples); or (7) combining weights.Type: ApplicationFiled: November 7, 2007Publication date: March 13, 2008Inventors: Carmela Cozzo, Gregory Bottomley, Rajaram Ramesh
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Publication number: 20070244953Abstract: A method and corresponding circuit for determining a final result for a desired series of multiply-and-accumulate (MAC) operations are based on counting the occurrence of products in the desired series of MAC operations, multiplying the counts by their corresponding products to obtain partial sums, and adding the partial sums to obtain the final result. MAC processing as taught herein can be applied to a wide range of applications, such as received signal processing in wireless communication for computationally efficient (and high-rate) generation of interference correlation estimates and/or equalization filter values for a received communication signal.Type: ApplicationFiled: February 17, 2006Publication date: October 18, 2007Inventors: Yi-Pin Wang, Gregory Bottomley, Andres Reial
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Publication number: 20070189364Abstract: Signal impairment correlations for multiple signals in a received multipath signal are constructed by fitting parametric models associated with each high-data-rate signal in the multipath against measured impairment correlations. The estimated model fitting parameters are applied to form impairment correlation estimates for all signals. The models comprise a separate impairment covariance matrix scaled by a model fitting parameter for each high-data-rate signal and a noise covariance matrix scaled by a noise element model fitting parameter. The model fitting parameters may be estimated by a least-squares formulation and applied to form impairment correlation estimates for all signals of interest. The resulting impairment correlation estimates may be provided to G-RAKE receivers or joint scaling demodulators to demodulate the signals while suppressing interference from the high-data-rate signals.Type: ApplicationFiled: December 12, 2006Publication date: August 16, 2007Inventors: Yi-Pin Wang, Carmela Cozzo, Gregory Bottomley, Gunnar Peters
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Publication number: 20070147481Abstract: A linear turbo-equalizer for use in a CDMA receiver equalizes a despread received signal (rather than the spread received signal) to suppress self-interference resulting from coupling between transmitted symbols. In an example implementation, a linear equalizer based on a generalized-Rake (G-Rake) receiver design uses decoder feedback in forming Rake combining weights as well as in forming a self-interference estimate removed from the equalizer signal provided to the decoder. Preferably, turbo de-coding is also performed. In that case, each turbo-decoder component preferably executes one pass before feeding back information to the equalizer. This ensures that the turbo-decoder does not prematurely lock onto an incorrect code word before feeding back extrinsic information to the equalizer.Type: ApplicationFiled: December 22, 2005Publication date: June 28, 2007Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (publ)Inventors: Gregory Bottomley, Jung-Fu Cheng
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Publication number: 20070104254Abstract: Multi-transmitter interference caused by one or more interfering own-cell and/or other-cell transmitters is reduced in a RAKE-based receiver. The RAKE-based receiver comprises a plurality of RAKE fingers, a processor and a combiner. The plurality of RAKE fingers are configured to despread received symbols, wherein a delay for a first one of the plurality of RAKE fingers corresponds to a symbol of interest transmitted by a first transmitter and a delay for a second one of the plurality of RAKE fingers corresponds to an interfering symbol transmitted by a second transmitter. The processor is configured to determine a cross-correlation between the symbol of interest and the interfering symbol. The combiner is configured to combine the symbol of interest with the interfering symbol using the cross-correlation to reduce interference attributable to the interfering symbol from the symbol of interest.Type: ApplicationFiled: December 5, 2006Publication date: May 10, 2007Inventors: Gregory Bottomley, Yi-Pin Wang
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Publication number: 20070098048Abstract: Exemplary combining weight generation is based on estimating received signal impairment correlations using a weighted summation of interference impairment terms, such as an interference correlation matrix associated with a transmitting base station, and a noise impairment term, such as a noise correlation matrix, the impairment terms scaled by fitting parameters. The estimate is updated based on adapting the fitting parameters responsive to measured signal impairment correlations. The interference matrices are calculated from channel estimates and delay information, and knowledge of the receive filter pulse shape. Instantaneous values of the fitting parameters are determined by fitting the impairment correlation terms to impairment correlations measured at successive time instants and the fitting parameters are adapted at each time instant by updating the fitting parameters based on the instantaneous values.Type: ApplicationFiled: December 12, 2006Publication date: May 3, 2007Inventors: Douglas Cairns, Gregory Bottomley, Yi-Pin Wang
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Publication number: 20070011600Abstract: According to a method and apparatus taught herein, a decoding circuit and method decode linear block codes based on determining joint probabilities for one or more related subsets of bits in received data blocks. The use of joint probabilities enables faster and more reliable determination of received bits, meaning that, for example, joint probability decoding requires fewer decoding iterations than a comparable decoding process based on single-bit probabilities. As a non-limiting example, the decoding circuit and method taught herein provide advantageous operation with Low Density Parity Check (LDPC) codes, and can be incorporated in a variety of communication systems and devices, such as those associated with wireless communication networks.Type: ApplicationFiled: June 13, 2006Publication date: January 11, 2007Inventors: Hanna Johannesson, Ali Khayrallah, Gregory Bottomley
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Publication number: 20060291543Abstract: A wireless communication receiver obtains improved performance under certain fast fading conditions by basing one or more received signal processing operations on pre-despreading chip sample correlations rather than on post-despreading noise correlations, but preserves soft scaling information by determining one or more scaling factors that relate the chip sample correlations to the noise correlations. By way of non-limiting examples, a Generalized RAKE receiver circuit may base combining weight generation on chip sample correlations rather than on post-despreading pilot symbol noise correlations, but scale the combining weights as a function of the one or more scaling factors, or, equivalently, scale the combined values generated from the combining weights. Similar scaling may be performed with respect to chip equalization filter combining weights in a chip equalization receiver circuit.Type: ApplicationFiled: June 22, 2005Publication date: December 28, 2006Inventors: Tracy Fulghum, Gregory Bottomley
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Publication number: 20060293074Abstract: A system and method for adapting a broadcast service in a cellular communication network. A base station receives indications of channel quality from registered users of the broadcast service, and adapts broadcast transmission parameters to improve channel quality for the broadcast users if at least one of the broadcast users indicates that channel quality needs to be improved. If none of the broadcast users indicates that channel quality needs to be improved, the base station adapts the transmission parameters to decrease channel quality for the broadcast users. The transmission parameters may be adapted by techniques such as changing the broadcast transmit power, changing the level of FEC encoding and modulation, changing the number of channel resources allocated, or changing the transmission data rate for the broadcast service.Type: ApplicationFiled: June 27, 2005Publication date: December 28, 2006Inventors: Gregory Bottomley, Ali Khayrallah, Erik Dahlman
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Publication number: 20060268962Abstract: A method and apparatus for determining operating modes in a receiver is described herein. A delay searcher in the receiver detects a signal image in the received signal. When the receiver is a RAKE receiver, a plurality of RAKE fingers coherently combine time-shifted versions of the received signal at different delays. Alternatively, when the receiver is a chip equalization receiver, an FIR filter coherently pre-combines the signal images in the received signal. A processor determines delays. In particular, the processor generates a first signal quality metric for a single-delay receiver mode, and generates a second signal quality metric for a multi-delay receiver mode. Based on a comparison of the first and second signal quality metrics, the processor selects the single-delay or the multi-delay receiver mode for processing the signal image.Type: ApplicationFiled: September 2, 2005Publication date: November 30, 2006Inventors: Douglas Cairns, Gregory Bottomley, Yi-Pin Wang
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Publication number: 20060262840Abstract: According to method and apparatus embodiments taught herein, power control feedback is generated for a control channel signal that is received in conjunction with a reference channel signal based on the reference channel's signal strength or quality, and an estimate of a gain factor relating the control and reference channel signals. By way of non-limiting example set in a Wideband CDMA (WCDMA) context, the reference channel signal comprises a Common Pilot Channel (CPICH) signal and the control channel signal comprises a Fractional Dedicated Physical Channel (F-DPCH) signal that is transmitted at an (unknown) power gain relative to the CPICH signal.Type: ApplicationFiled: December 29, 2005Publication date: November 23, 2006Inventors: Yi-Pin Wang, Gregory Bottomley, Lennart Andersson