Patents by Inventor Jack Harriman Winters
Jack Harriman Winters 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: 7283798Abstract: A method of performing receive antenna selection is presented. The method executes a determination operation for a set of receive antennas, determines a maximum result of the determination operation for two of the antennas, eliminates one of the two antennas from the set of antennas, and repeats the determination and elimination process until only a predetermined number of antennas remain in the set. The signals from these remaining antennas are then processed. The present invention reduces receiver complexity and cost.Type: GrantFiled: December 29, 2005Date of Patent: October 16, 2007Assignee: AT&T Corp.Inventors: Jack Harriman Winters, Yang-Seok Choi, Byoung-Jo J Kim, Andreas Molisch, Moe Z. Win, Hui Luo
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Patent number: 7068628Abstract: A MIMO OFDM system includes a plurality of space-time encoders for encoding respective data blocks with independent space-time codes. The transformed data block signals are transmitted by a plurality of transmit antennas and received by a plurality of receive antennas. The received data is pre-whitened prior to maximum likelihood detection. In one embodiment, successive interference cancellation can be used to improve system performance. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.Type: GrantFiled: February 23, 2001Date of Patent: June 27, 2006Assignee: AT&T Corp.Inventors: Ye Li, Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 7058367Abstract: A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.Type: GrantFiled: January 31, 2003Date of Patent: June 6, 2006Assignee: AT&T Corp.Inventors: Hui Luo, Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 7006810Abstract: A method of performing receive antenna selection is presented. The method executes a determination operation for a set of receive antennas, determines a maximum result of the determination operation for two of the antennas, eliminates one of the two antennas from the set of antennas, and repeats the determination and elimination process until only a predetermined number of antennas remain in the set. The signals from these remaining antennas are then processed. The present invention reduces receiver complexity and cost.Type: GrantFiled: December 19, 2002Date of Patent: February 28, 2006Assignee: AT&T Corp.Inventors: Jack Harriman Winters, Yang-Seok Choi, Byoung-Jo J Kim, Andreas Molisch, Moe Z. Win, Hui Luo
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Patent number: 6972717Abstract: A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations.Type: GrantFiled: June 6, 2003Date of Patent: December 6, 2005Assignee: Cingular Wireless II, LLCInventors: Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6970524Abstract: The present invention provides methods and systems that generate symbol delay times. By receiving a communication signal using a plurality of antennas, a set of respective communication channels can be characterized. The characterized channels can be then used to determine sets of forward-time delays and time-reverse delays using a minimum-mean-square-error technique. By selecting the set of delays that can provide a lower mean-square-error in an equalizer, symbol estimation can be improved as compared to a system that only estimates delays in a single temporal direction.Type: GrantFiled: November 28, 2000Date of Patent: November 29, 2005Assignee: AT&T Corp.Inventors: Huaiyu Zeng, Ye Li, Jack Harriman Winters
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Patent number: 6895253Abstract: A wireless communication system and method includes antenna arrays at both the transmitter and receiver having a plurality of elements for very high data rate communication. Phased array antennas or directive fixed beam antennas are used with a beamwidth in azimuth and elevation less than 30° to increase the power margin and to decrease the delay spread of signals at the receiver to permit wireless data communications at high data rates in closed environments, for example, bursty transmissions and isochronous communications. The wireless communication system is capable of data transmission rates which exceed 1 Gbps with propagation losses of up to at least 60 dB relative to one meter.Type: GrantFiled: March 14, 1995Date of Patent: May 17, 2005Assignee: Lucent Technologies Inc.Inventors: Manuel Joseph Carloni, Michael James Gans, Reinaldo A. Valenzuela, Jack Harriman Winters
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Patent number: 6804312Abstract: The present invention provides techniques to determine an antenna selection and associated weights for a transmission system having multiple antennas. A receiver first samples signals received on each antenna and the channel characteristics for each received signal is calculated. The signal-to-interference-plus-noise (SINR) ratio for various combinations of antennas is estimated using the channel characteristics and a subset of antennas and accompanying weights are determined that can provide an advantageous SINR.Type: GrantFiled: November 27, 2000Date of Patent: October 12, 2004Assignee: AT&T Corp.Inventors: Moe Z. Win, Jack Harriman Winters
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Publication number: 20040022207Abstract: A system and method for predicting future interference power in packet-switched networks is disclosed, allowing improved performance in such networks via optimized link adaptation and power control. In an embodiment for use in a cellular network, Kalman filtering can be used to provide the interference estimation through identification of the number of active co-channel interferers in the cellular networks and correlation of the interference power with the number of active interferers. A two-dimensional Kalman filter can be used to exploit that correlation to enhance prediction accuracy. In an alternative embodiment, a one-dimensional Kalman filter can be used where the number of active interferers is not considered.Type: ApplicationFiled: August 2, 2002Publication date: February 5, 2004Inventors: Kin K. Leung, Jack Harriman Winters
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Patent number: 6658261Abstract: The present invention discloses a method for predicting fast fading using sinusoidal modeling techniques. The method first applies a finite impulse response low pass filter to the incoming signal thus increasing the fading power to noise ratio. Applying a root-MUSIC frequency estimation model, a sinusoidal model for the fading process is obtained. This model can be used to enhance the performance of spatial diversity schemes or temporal processing schemes to reduce the effect of the fading.Type: GrantFiled: August 20, 2002Date of Patent: December 2, 2003Assignee: AT&T Corp.Inventors: Jack Harriman Winters, Jeng-Kuang Hwang
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Publication number: 20030214917Abstract: Interference is reduced with a multiple-input-multiple-output (MIMO) system having a set of basestations including a first basestation and a second basestation is reduced. Signals associated with the first basestation having its own antenna elements are received. The first basestation is associated with its own mobile stations each having their own antenna elements. Each signal associated with the first basestation is uniquely associated with a mobile station associated with the first basestation. Signals associated with the second basestation having its own antenna elements are received. The second basestation is associated with its own mobile stations each having their own antenna elements. Each signal associated with the second basestation is uniquely associated with a mobile station associated with the second basestation. Signals associated with the first basestation are jointly detected in conjunction with the signals associated with the second basestation to produce a set of detected signals.Type: ApplicationFiled: September 26, 2002Publication date: November 20, 2003Applicant: AT&T Corp.Inventors: Andreas Molisch, Martin Vivian Clark, Huaiyu Dai, Moe Z. Win, Jack Harriman Winters
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Publication number: 20030210186Abstract: A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations.Type: ApplicationFiled: June 6, 2003Publication date: November 13, 2003Applicant: AT&T Wireless Services, Inc.Inventors: Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6590533Abstract: A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations.Type: GrantFiled: May 24, 2002Date of Patent: July 8, 2003Assignee: AT&T Wireless Services, Inc.Inventors: Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6505053Abstract: The present invention discloses a method for predicting fast fading using sinusoidal modeling techniques. The method first applies a finite impulse response low pass filter to the incoming signal thus increasing the fading power to noise ratio. Applying a root-MUSIC frequency estimation model, a sinusoidal model for the fading process is obtained. This model can be used to enhance the performance of spatial diversity schemes or temporal processing schemes to reduce the effect of the fading.Type: GrantFiled: December 22, 1999Date of Patent: January 7, 2003Assignee: AT&T Corp.Inventors: Jack Harriman Winters, Jeng-Kuang Hwang
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Publication number: 20020135516Abstract: A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations.Type: ApplicationFiled: May 24, 2002Publication date: September 26, 2002Applicant: AT&T Wireless Sevices, Inc.Inventors: Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6404388Abstract: A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations.Type: GrantFiled: January 21, 2000Date of Patent: June 11, 2002Assignee: AT&T Wireless Services, Inc.Inventors: Nelson Ray Sollenberger, Jack Harriman Winters
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Publication number: 20010053143Abstract: A MIMO OFDM system includes a plurality of space-time encoders for encoding respective data blocks with independent space-time codes. The transformed data block signals are transmitted by a plurality of transmit antennas and received by a plurality of receive antennas. The received data is pre-whitened prior to maximum likelihood detection. In one embodiment, successive interference cancellation can be used to improve system performance. Channel parameter estimation can be enhanced by weighting the channel impulse response estimates based upon a deviation from average.Type: ApplicationFiled: February 23, 2001Publication date: December 20, 2001Inventors: Ye Li, Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6278752Abstract: A system and method for generating a coherent reference signal for extracting desired user signals from received signals even after error propagation is underway, are presented. A data symbol preceding a sequence whose relative phases are known is used as an absolute phase reference. Since errors in detection of the phase reference symbol are usually caused by error propagation already underway, the sequence can be used to reacquire the desired signal with merely an absolute phase shift in detected data, which allows accurate differential detection of the desired user signal even in the absence of absolute phase knowledge.Type: GrantFiled: May 2, 1997Date of Patent: August 21, 2001Assignees: AT&T Corporation, Lucent Technologies, Inc.Inventors: Glenn David Golden, Carol Catalano Martin, Nelson Ray Sollenberger, Jack Harriman Winters
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Patent number: 6147985Abstract: An apparatus for performance improvement of a digital wireless receiver comprises a processing circuit for processing a plurality of received signals and providing a processed signal, wherein a plurality of weights is applied to the plurality of received signals producing a plurality of weighted received signals. The plurality of weighted received signals are combined to provide the processed signal. A weight generation circuit generates the plurality of weights wherein weights are based on a given number of interferers.Type: GrantFiled: May 1, 1997Date of Patent: November 14, 2000Assignee: Lucent Technologies Inc.Inventors: Israel Bar-David, Glenn David Golden, Jack Harriman Winters
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Patent number: 6125152Abstract: An improvement of a digital wireless receiver comprises a processing circuit for processing a plurality of received signals, and providing a processed signal having an amplitude; and an adjusting circuit for adjusting the amplitude of the processed signal, the adjusting circuit coupled to the processing circuit, where the adjusting circuit adjusts the amplitude as a function of distortion of the plurality of received signals. The processing circuit can weight and combine the plurality of received signals. The distortion can be estimated from a squared error of the plurality of received signals, which can be averaged over a sliding window. The function can comprise multiplying the processed signal by square root of the averaged squared error. Such amplitude adjustment is useful to maintain the soft decision information for the processed signal that is fed to a base station having soft decision decoding, or can be used in the base station with soft decoding.Type: GrantFiled: August 12, 1996Date of Patent: September 26, 2000Assignee: Lucent Technologies, Inc.Inventors: Glenn David Golden, Nelson Ray Sollenberger, Jack Harriman Winters