Patents by Inventor Paul J. Stager
Paul J. Stager 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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Publication number: 20140327579Abstract: In one embodiment, an apparatus includes a plurality of antennas, a receiver in communication with said plurality of antennas for receiving one or more packets in a block based modulation environment, a switch interposed between a portion of the antennas and the receiver for switching between the antennas, and a processor for calculating angle of arrival for use in identifying a location of a mobile device transmitting the one or more packets.Type: ApplicationFiled: May 3, 2013Publication date: November 6, 2014Applicant: CISCO TECHNOLOGY, INC.Inventors: Brian Donald Hart, Paul J. Stager, Santosh Pandey, David Kloper, Dan Lyons, Matthew A. Silverman
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Patent number: 8861629Abstract: Multiple-input multiple-output (MIMO) wireless communication techniques are provided that involve mapping multiple spatial streams to corresponding modes of a wireless channel between a plurality of antennas of a first wireless communication device and a plurality of antennas of a second wireless communication device so as to allocate or distribute power unequally to the plurality of modes. In addition, techniques are provided herein to cyclically shift a mapping of spatial streams to modes of the channel.Type: GrantFiled: July 1, 2010Date of Patent: October 14, 2014Assignee: Cisco Technology, Inc.Inventors: Paul J. Stager, Gary L. Sugar, Matthew A. Silverman, Zhigang Gao, Chandra Vaidyanathan
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Publication number: 20140241240Abstract: Techniques are presented for distributed processing Distributed-Input Distributed-Output (DIDO) wireless communication. A plurality of base stations (e.g., APs) are provided, each configured to wirelessly serve one or more wireless devices (e.g., clients). At least first and second base stations are configured to transmit simultaneously at an agreed upon time. The first and second base stations are each configured to locally generate steering matrix information used to spatially precode their respective data transmissions in order to steer their respective data transmissions to their one or more wireless devices while nulling to the one or more client devices of the other base station. Moreover, the first and second base stations are each configured to locally generate a transmit waveform by applying the steering matrix information to their respective data transmissions.Type: ApplicationFiled: February 28, 2013Publication date: August 28, 2014Applicant: CISCO TECHNOLOGY, INC.Inventors: David Kloper, Brian D. Hart, Paul J. Stager, Matthew A. Silverman
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Patent number: 8781040Abstract: A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.Type: GrantFiled: March 1, 2013Date of Patent: July 15, 2014Assignee: Cisco Technology, Inc.Inventors: Raghuram Rangarajan, Brian Donald Hart, Paul J. Stager
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Patent number: 8761291Abstract: Techniques are provided to allow for implicit determination of the full spatial signature of a wireless channel between first and second wireless devices for multiple-input multiple-output (MIMO) wireless communication between the first and second wireless devices. The first wireless device receives uplink signals at a plurality of antennas of the first wireless device that are transmitted via a plurality of antennas of a second wireless device. Values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device are derived. Using a sliding window for groups of adjacent subcarriers, downlink beamforming weights are computed for each group of subcarriers using channel information of one or more proximate groups of subcarriers. The downlink beamforming weights for the respective groups of subcarriers are applied to a number of spatial streams in a downlink transmission to be transmitted to the second wireless device.Type: GrantFiled: June 24, 2011Date of Patent: June 24, 2014Assignee: Cisco Technology, Inc.Inventors: Hang Jin, Li Guo, Paul J. Stager, Matthew A. Silverman, Bror Peterson
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Publication number: 20140140438Abstract: Techniques are presented herein to achieve reduced array gain associated with a transmission made from multiple antennas of a wireless communication device. In accordance with one technique, a wireless communication device is provided having a plurality of transmitters each configured to transmit via a corresponding one of a plurality of antennas. Subcarriers of at least one transmit signal to be weighted across the plurality of transmitters are allocated power so that for each subcarrier, only one transmitter is allocated a maximum power.Type: ApplicationFiled: November 16, 2012Publication date: May 22, 2014Applicant: CISCO TECHNOLOGY, INC.Inventors: Matthew A. Silverman, Paul J. Stager, James C. Nicholson
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Patent number: 8718172Abstract: Techniques are provided for generating a precoding matrix for a multi-user multiple-input multiple-output wireless communication system. A first wireless communication device is provided that has a plurality of antennas from which multiple spatial streams are to be simultaneously transmitted to a plurality of second wireless communication devices. A channel matrix is computed between the antennas of the first device and the antennas of each of the second wireless communication devices to produce a plurality of client-specific channel matrices. A singular value decomposition is computed of each client-specific channel matrices. A number of strongest singular values and their corresponding singular vectors are stored from the singular decomposition of each of the client-specific channel matrices. From each client-specific channel matrix, a principal component-like single-client channel matrix is computed.Type: GrantFiled: April 30, 2012Date of Patent: May 6, 2014Assignee: Cisco Technology, Inc.Inventors: Brian Donald Hart, Genyuan Wang, Ahmadreza Hedayat, Paul J. Stager
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Patent number: 8718560Abstract: At a wireless device operating in an unlicensed frequency band, energy received at a plurality of antennas is analyzed to detect interference on a channel in the unlicensed frequency band. The type of interference detected in the received energy is determined. Parameters are then generated for a nulling filter based on the type of interference detected in the received energy. The nulling filter is applied to the received energy at the plurality of antennas to produce a spatially filtered output. The spatially filtered output is evaluated to determine whether to send a transmission on the channel in the unlicensed frequency band.Type: GrantFiled: July 7, 2011Date of Patent: May 6, 2014Assignee: Cisco Technology, Inc.Inventors: Hang Jin, Li Guo, Paul J. Stager, Neil R. Diener, Matthew A. Silverman
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Publication number: 20140098681Abstract: In a wireless local are network, each of multiple access points, in a high density deployment, are configured to suppress co-channel interference. A first access point having a plurality of antennas beamforms a transmission to a wireless client device within a null-space or with the weakest singular eigenmodes of a wireless channel between the first access point and at least one co-channel second access point. Techniques are presented herein for situations in which any given access point has two or more co-channel access points. In addition, an access point may perform receive side suppression with respect to a transmission (made by a co-channel access point to one of its associated wireless client devices) that is received from that co-channel access point.Type: ApplicationFiled: October 5, 2012Publication date: April 10, 2014Applicant: CISCO TECHNOLOGY, INC.Inventors: Paul J. Stager, Matthew A. Silverman, Zhigang Gao, John Blosco, Raghuram Rangarajan
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Patent number: 8676144Abstract: Interference in an unlicensed frequency band is spatially filtered out from received signals at a wireless device operating in the unlicensed frequency band. Energy received at a plurality of antennas of the wireless is device is analyzed to detect interference in the unlicensed frequency band. The detected interference is classified by type. Parameters for a nulling filter are generated or selected based on the type of interference detected in the received energy. During a time interval when it is expected to receive desired signals, the nulling filter is applied using the parameters to signals obtained from energy received at the plurality of antennas during the time interval.Type: GrantFiled: April 14, 2011Date of Patent: March 18, 2014Assignee: Cisco Technology, Inc.Inventors: Li Guo, Hang Jin, Paul J. Stager, Neil R. Diener, Matthew A. Silverman, Chandra Vaidyanathan
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Patent number: 8582517Abstract: Techniques are provided to de-correlate sub-bands of a packet to be transmitted. At a communication device, a signal (packet or frame) is generated for transmission. The packet or frame comprises a plurality of subcarriers in each of a plurality of sub-bands. Different cyclic delays are applied to the plurality of sub-bands of the signal. The signal is amplified after applying the different cyclic delays for transmission from the communication device.Type: GrantFiled: November 19, 2010Date of Patent: November 12, 2013Assignee: Cisco Technology, Inc.Inventors: Matthew A. Silverman, Paul J. Stager, John Blosco
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Publication number: 20130286863Abstract: Techniques are provided to determine whether or not incident power at a wireless communication device in at least two frequency channels is from the same device. Incident power in frequency channels allocated to a basic service set in a wireless network is received at a plurality of antennas of the wireless communication device. Channel state information is computed for at least two frequency channels allocated to the basic service set. One or more metrics are generated based on the channel state information in the two frequency channels. The one or more metrics are evaluated to characterize an uplink signal bandwidth associated with the two channels to determine whether or not the incident power in the two channels is from the same device.Type: ApplicationFiled: April 30, 2012Publication date: October 31, 2013Applicant: CISCO TECHNOLOGY, INC.Inventors: Matthew A. Silverman, Paul J. Stager, Brian D. Hart, Mohammad Janani, Ahmadreza Hedayat
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Publication number: 20130287131Abstract: Techniques are provided for generating a precoding matrix for a multi-user multiple-input multiple-output wireless communication system. A first wireless communication device is provided that has a plurality of antennas from which multiple spatial streams are to be simultaneously transmitted to a plurality of second wireless communication devices. A channel matrix is computed between the antennas of the first device and the antennas of each of the second wireless communication devices to produce a plurality of client-specific channel matrices. A singular value decomposition is computed of each client-specific channel matrices. A number of strongest singular values and their corresponding singular vectors are stored from the singular decomposition of each of the client-specific channel matrices. From each client-specific channel matrix, a principal component-like single-client channel matrix is computed.Type: ApplicationFiled: April 30, 2012Publication date: October 31, 2013Applicant: CISCO TECHNOLOGY, INC.Inventors: Brian Donald Hart, Genyuan Wang, Ahmadreza Hedayat, Paul J. Stager
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Patent number: 8559887Abstract: Techniques are provided to measure how fast a wireless channel is changing between a first wireless communication device (e.g., a wireless base station or access point) and a second wireless device (e.g., a wireless client device) based on signals that the first communication wireless device receives at a plurality of antennas from a second wireless communication device. Techniques are also provided to measure a degree of mobility of the second wireless communication device based on signals received at the first communication wireless device from the second communication wireless device.Type: GrantFiled: June 2, 2010Date of Patent: October 15, 2013Assignee: Cisco Technology, Inc.Inventors: Paul J. Stager, Matthew A. Silverman, Srikant Kuppa
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Patent number: 8542767Abstract: Techniques are provided herein for training a digital predistortion module in a wireless communication device. A controller identifies one or more participating wireless devices to participate in a training session during which the particular wireless device makes test transmissions and the one or more participating wireless devices make measurements based on reception of the test transmissions sent by the particular wireless device. The controller sends commands to the particular wireless device and to the one or more participating wireless devices to initiate the training session. The controller receives measurement data from the one or more participating wireless devices based on reception of the test transmissions from the particular wireless device during the training session and determines predistortion parameters for use by the particular wireless device based on the measurement data.Type: GrantFiled: September 14, 2012Date of Patent: September 24, 2013Assignee: Cisco Technology, Inc.Inventors: Matthew A. Silverman, Paul J. Stager
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Publication number: 20130083676Abstract: Enhanced stomp-and-restart techniques are provided. At a plurality of antennas of a wireless communication device, energy is received in a channel in which one or more frames may be transmitted to the wireless communication device from any one of a plurality of other wireless communication devices. A first frame is acquired from the received energy. Channel state information is computed for the first frame and the channel state information associated with the first frame is stored. Interference suppression parameters are computed for the first frame from the channel state information. It is determined whether a stronger second frame is being received by the wireless communication device. The received energy associated with the first frame is nulled-out using the interference suppression parameters when the stronger second frame is determined to be received so that start-of-packet processing and decoding is performed on the stronger second frame.Type: ApplicationFiled: September 30, 2011Publication date: April 4, 2013Applicant: Cisco Technology, Inc.Inventor: Paul J. Stager
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Patent number: 8411807Abstract: A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.Type: GrantFiled: September 2, 2008Date of Patent: April 2, 2013Assignee: Cisco Technology, Inc.Inventors: Raghuram Rangarajan, Brian Donald Hart, Paul J. Stager
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Publication number: 20130034135Abstract: Techniques are provided herein for training a digital predistortion module in a wireless communication device. A controller identifies one or more participating wireless devices to participate in a training session during which the particular wireless device makes test transmissions and the one or more participating wireless devices make measurements based on reception of the test transmissions sent by the particular wireless device. The controller sends commands to the particular wireless device and to the one or more participating wireless devices to initiate the training session. The controller receives measurement data from the one or more participating wireless devices based on reception of the test transmissions from the particular wireless device during the training session and determines predistortion parameters for use by the particular wireless device based on the measurement data.Type: ApplicationFiled: September 14, 2012Publication date: February 7, 2013Applicant: CISCO TECHNOLOGY, INC.Inventors: Matthew A. Silverman, Paul J. Stager
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Publication number: 20130012134Abstract: At a wireless device operating in an unlicensed frequency band, energy received at a plurality of antennas is analyzed to detect interference on a channel in the unlicensed frequency band. The type of interference detected in the received energy is determined. Parameters are then generated for a nulling filter based on the type of interference detected in the received energy. The nulling filter is applied to the received energy at the plurality of antennas to produce a spatially filtered output. The spatially filtered output is evaluated to determine whether to send a transmission on the channel in the unlicensed frequency band.Type: ApplicationFiled: July 7, 2011Publication date: January 10, 2013Applicant: CISCO TECHNOLOGY, INC.Inventors: Hang Jin, Li Guo, Paul J. Stager, Neil R. Diener, Matthew A. Silverman
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Publication number: 20120328033Abstract: Techniques are provided to allow for implicit determination of the full spatial signature of a wireless channel between first and second wireless devices for multiple-input multiple-output (MIMO) wireless communication between the first and second wireless devices. The first wireless device receives uplink signals at a plurality of antennas of the first wireless device that are transmitted via a plurality of antennas of a second wireless device. Values at a plurality of subcarriers of the received signals across the plurality of antennas of the first wireless device are derived. Using a sliding window for groups of adjacent subcarriers, downlink beamforming weights are computed for each group of subcarriers using channel information of one or more proximate groups of subcarriers. The downlink beamforming weights for the respective groups of subcarriers are applied to a number of spatial streams in a downlink transmission to be transmitted to the second wireless device.Type: ApplicationFiled: June 24, 2011Publication date: December 27, 2012Applicant: CISCO TECHNOLOGY, INC.Inventors: Hang Jin, Li Guo, Paul J. Stager, Matthew A. Silverman, Bror Peterson