Patents by Inventor Erik Lindskog
Erik Lindskog 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: 10749582Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: GrantFiled: June 10, 2019Date of Patent: August 18, 2020Assignee: REARDEN, LLCInventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman
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Publication number: 20190296810Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: ApplicationFiled: June 10, 2019Publication date: September 26, 2019Inventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman
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Publication number: 20190271775Abstract: This disclosure provides systems, methods and apparatuses for detecting motion based on one or more wireless signals. In some implementations, a receiving device may receive a first frame and a second frame from a transmitting device, may determine a first channel impulse response (CIR) based on the first frame, may determine a second CIR based on the second frame, may determine a difference between a shape of the first CIR and a shape of the second CIR, and may detect motion based on the determined difference.Type: ApplicationFiled: May 17, 2018Publication date: September 5, 2019Inventors: Xiaoxin Zhang, Youngsin Lee, Ning Zhang, Erik Lindskog, Vincent Knowles Jones, IV
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Patent number: 10320455Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: GrantFiled: June 13, 2016Date of Patent: June 11, 2019Assignee: REARDEN, LLCInventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman
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Patent number: 10039073Abstract: To determine a location of a client device in a wireless network having at least first and second network devices, with known locations, one of the network devices transmits a message to the other network device and the other network device responds with an acknowledgement message. A client device receives the message and the acknowledgement message as well as respective times indicating actual times at which the message and the acknowledgement message were processed by one of the first and second network devices. The client device determines its location based on the times at which it received the message and the acknowledgement message and the difference between the actual processing times. This location may be refined by determining an angle between the client device and at least one of the network devices having multiple antennas and being configured for steered beam communications.Type: GrantFiled: August 12, 2013Date of Patent: July 31, 2018Assignee: QUALCOMM IncorporatedInventors: Naveen Kumar Kakani, Ben Tarlow, Erik Lindskog, Raja Banerjea, Hong Wan, Ian Charles Blair
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Publication number: 20160294455Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: ApplicationFiled: June 13, 2016Publication date: October 6, 2016Inventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman
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Patent number: 9369888Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: GrantFiled: September 10, 2013Date of Patent: June 14, 2016Assignee: REARDEN, LLCInventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman
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Patent number: 9319182Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. An initial symbol estimation is performed for a received symbol vector. The soft information of the received symbol vector can be more accurately calculated using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated based on the initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.Type: GrantFiled: April 13, 2015Date of Patent: April 19, 2016Assignee: Qualcomm Technologies International, Ltd.Inventors: Hong Wan, Fei Tong, Erik Lindskog
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Patent number: 9288625Abstract: A method for determining the location of a client device in a wireless network having at least a first and a second other network devices each with a known location is disclosed. The first other network device and the second other network device each transmit to the other two messages, and each acknowledges the first message sent by the other. The client device receives these messages, the acknowledgement messages, and respective timing information indicating the actual time when the message and the acknowledgement message were processed by the first and the second other network devices. The client device utilizes the difference between the actual processing times to determine its location. This method allows the location determination to be independent of the accuracy of the time of flight between the first other network device and the second other network device.Type: GrantFiled: June 30, 2014Date of Patent: March 15, 2016Assignee: QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD.Inventors: Erik Lindskog, Hong Wan
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Patent number: 9277369Abstract: Methods for determining a location of a client device in a wireless network having at least a first other network device with a known location are disclosed. Transmission-to-self calibrations are performed at the first other network device and/or the client device to determine RF group delay of the first other network device and/or the client device. The client device receives messages and acknowledgements from the other network devices and determines its location based on information received including the time at which it received the messages, the acknowledgements and the RF groupdelay of the first other network device. As such, the location calculation can be refined by accounting for the RF group delays of the first other network device and/or the client device.Type: GrantFiled: June 30, 2014Date of Patent: March 1, 2016Assignee: QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD.Inventors: Erik Lindskog, Hong Wan
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Publication number: 20150382152Abstract: Methods for determining a location of a client device in a wireless network having at least a first other network device with a known location are disclosed. Transmission-to-self calibrations are performed at the first other network device and/or the client device to determine RF group delay of the first other network device and/or the client device. The client device receives messages and acknowledgements from the other network devices and determines its location based on information received including the time at which it received the messages, the acknowledgements and the RF group delay of the first other network device. As such, the location calculation can be refined by accounting for the RF group delays of the first other network device and/or the client device.Type: ApplicationFiled: June 30, 2014Publication date: December 31, 2015Inventors: Erik LINDSKOG, Hong WAN
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Publication number: 20150382143Abstract: A method for determining the location of a client device in a wireless network having at least a first and a second other network devices each with a known location is disclosed. The first other network device and the second other network device each transmit to the other two messages, and each acknowledges the first message sent by the other. The client device receives these messages, the acknowledgement messages, and respective timing information indicating the actual time when the message and the acknowledgement message were processed by the first and the second other network devices. The client device utilizes the difference between the actual processing times to determine its location. This method allows the location determination to be independent of the accuracy of the time of flight between the first other network device and the second other network device.Type: ApplicationFiled: June 30, 2014Publication date: December 31, 2015Inventors: Erik LINDSKOG, Hong WAN
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Publication number: 20150341143Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. An initial symbol estimation is performed for a received symbol vector. The soft information of the received symbol vector can be more accurately calculated using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated based on the initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.Type: ApplicationFiled: April 13, 2015Publication date: November 26, 2015Inventors: Hong WAN, Fei TONG, Erik LINDSKOG
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Patent number: 9083499Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. Initial symbol estimation is performed for a transmitted symbol vector. The soft information of the transmitted symbol vector can be more accurately calculated by deemphasizing the LLRs associated with symbols belonging to weak channels that may suffer from poor initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.Type: GrantFiled: December 31, 2013Date of Patent: July 14, 2015Assignee: CAMBRIDGE SILICON RADIO LIMITEDInventors: Fei Tong, Hong Wan, Erik Lindskog
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Publication number: 20150188667Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. Initial symbol estimation is performed for a transmitted symbol vector. The soft information of the transmitted symbol vector can be more accurately calculated by deemphasizing the LLRs associated with symbols belonging to weak channels that may suffer from poor initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.Type: ApplicationFiled: December 31, 2013Publication date: July 2, 2015Inventors: Fei TONG, Hong WAN, Erik LINDSKOG
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Patent number: 9036756Abstract: There is disclosed a receiver and associated methods in which a received signal can be sampled at the symbol rate rather than oversampled. This reduction in the sampling frequency compared with conventional receivers lowers power consumption. Quality metrics in receiving the data (e.g. packet error rate, etc) are not adversely affected by setting a programmable phase shift in the sampling frequency. The programmable shift can be selected through a calibration process using a known sequence of symbols, such as the short training field in 802.11 standards.Type: GrantFiled: January 25, 2013Date of Patent: May 19, 2015Assignee: CAMBRIDGE SILICON RADIO LIMITEDInventors: Simon Chang, Erik Lindskog, Hong Wan, Rainer Herberholz
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Patent number: 9008240Abstract: This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. An initial symbol estimation is performed for a received symbol vector. The soft information of the received symbol vector can be more accurately calculated using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated based on the initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.Type: GrantFiled: December 31, 2013Date of Patent: April 14, 2015Assignee: Cambridge Silicon Radio LimitedInventors: Hong Wan, Fei Tong, Erik Lindskog
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Publication number: 20140211896Abstract: There is disclosed a receiver and associated methods in which a received signal can be sampled at the symbol rate rather than oversampled. This reduction in the sampling frequency compared with conventional receivers lowers power consumption. Quality metrics in receiving the data (e.g. packet error rate, etc) are not adversely affected by setting a programmable phase shift in the sampling frequency. The programmable shift can be selected through a calibration process using a known sequence of symbols, such as the short training field in 802.11 standards.Type: ApplicationFiled: January 25, 2013Publication date: July 31, 2014Applicant: CAMBRIDGE SILICON RADIO LIMITEDInventors: Simon Chang, Erik Lindskog, Hong Wan, Rainer Herberholz
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Publication number: 20140187259Abstract: To determine a location of a client device in a wireless network having at least first and second network devices, with known locations, one of the network devices transmits a message to the other network device and the other network device responds with an acknowledgement message. A client device receives the message and the acknowledgement message as well as respective times indicating actual times at which the message and the acknowledgement message were processed by one of the first and second network devices. The client device determines its location based on the times at which it received the message and the acknowledgement message and the difference between the actual processing times. This location may be refined by determining an angle between the client device and at least one of the network devices having multiple antennas and being configured for steered beam communications.Type: ApplicationFiled: August 12, 2013Publication date: July 3, 2014Inventors: Naveen Kumar Kakani, Ben Tarlow, Erik Lindskog, Raja Banerjea, Hong Wan, Ian Charles Blair
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Publication number: 20140016499Abstract: Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.Type: ApplicationFiled: September 10, 2013Publication date: January 16, 2014Inventors: Antonio Forenza, Erik Lindskog, Stephen G. Perlman