Patents by Inventor James L. Lansford
James L. Lansford 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: 8467284Abstract: Systems and methods for a scalable architecture for radio device and systems are disclosed. This architecture employs a scalable bandwidth to deliver higher data rates and transmission ranges to devices that need them, while still delivering lower power solutions for devices which utilize a smaller bandwidth. These systems and methods may divide the available frequency spectrum into a set of fundamental sub-bands. Different devices may use various multiples of these sub-bands depending on their needs. Devices employing this architecture are also capable of interoperation with one another regardless of the bandwidth they utilize. A device may scan through each sub-band within which the device intends to operate, searching for a common beacon transmitted by other devices utilizing the sub-band. If a beacon is found the device can choose to interoperate with the other device or, alternatively, continue scanning the sub-bands until an unused sub-band is found.Type: GrantFiled: August 8, 2011Date of Patent: June 18, 2013Assignee: Alereon, Inc.Inventors: James L. Lansford, Robert T. Short
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Patent number: 8116402Abstract: Systems and methods for cognitive radio are disclosed herein. Specifically, embodiments of the present invention may provide systems, methods and apparatuses for a cognitive radio which is operable to tailor its operation based on one or more criteria, which may pertain to the operating environment of the radio. In one embodiment, a cognitive radio may be operable to determine criteria associated with potentially interfering signals in the operating environment and determine corresponding transmission properties corresponding to protocol, power level, frequency, coding or timing of transmissions, so that these potentially interfering signals may be avoided or otherwise accounted for by transmitting according to these transmission properties.Type: GrantFiled: March 14, 2007Date of Patent: February 14, 2012Assignee: Alereon, Inc.Inventor: James L. Lansford
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Publication number: 20110292970Abstract: Systems and methods for a scalable architecture for radio device and systems are disclosed. This architecture employs a scalable bandwidth to deliver higher data rates and transmission ranges to devices that need them, while still delivering lower power solutions for devices which utilize a smaller bandwidth. These systems and methods may divide the available frequency spectrum into a set of fundamental sub-bands. Different devices may use various multiples of these sub-bands depending on their needs. Devices employing this architecture are also capable of interoperation with one another regardless of the bandwidth they utilize. A device may scan through each sub-band within which the device intends to operate, searching for a common beacon transmitted by other devices utilizing the sub-band. If a beacon is found the device can choose to interoperate with the other device or, alternatively, continue scanning the sub-bands until an unused sub-band is found.Type: ApplicationFiled: August 8, 2011Publication date: December 1, 2011Inventors: James L. Lansford, Robert T. Short
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Patent number: 8018831Abstract: Systems and methods for a scalable architecture for radio device and systems are disclosed. This architecture employs a scalable bandwidth to deliver higher data rates and transmission ranges to devices that need them, while still delivering lower power solutions for devices which utilize a smaller bandwidth. These systems and methods may divide the available frequency spectrum into a set of fundamental sub-bands. Different devices may use various multiples of these sub-bands depending on their needs. Devices employing this architecture are also capable of interoperation with one another regardless of the bandwidth they utilize. A device may scan through each sub-band within which the device intends to operate, searching for a common beacon transmitted by other devices utilizing the sub-band. If a beacon is found the device can choose to interoperate with the other device or, alternatively, continue scanning the sub-bands until an unused sub-band is found.Type: GrantFiled: February 4, 2005Date of Patent: September 13, 2011Assignee: Alereon, Inc.Inventors: James L. Lansford, Robert T. Short
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Patent number: 7782924Abstract: Embodiments of the present invention provide a system and method for reducing the power of a UWB signal over a desired range of frequencies. Embodiments of the present invention reduce power over the desired range of frequencies by reducing the sidelobe power of tones comprising the UWB signal. Embodiments of the present invention reduce sidelobe power by applying a particular windowing function to the UWB signal.Type: GrantFiled: January 12, 2007Date of Patent: August 24, 2010Assignee: Alereon, Inc.Inventors: Johann Chiang, James L. Lansford, Kevin Shelby
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Patent number: 7536282Abstract: Systems and methods for the design or implementation of statistical filters for use in the spectral shaping of transmissions are disclosed. A desired power spectrum may be mapped to find pole locations that approximate the desired spectrum. These pole locations may then be mapped to the edge or inside of an equilateral polygon lying inside a unit circle, the equilateral polygon having the same number of sides as the order of the statistical filter desired and one vertex mapped to unity, to yield a set of eigenvalues. These eigenvalues may be the eigenvalues of a stochastic matrix the elements of which may be the Markov transition probabilities for use in a statistical filter designed to achieve the desired power spectrum. Use of a statistical filter employing these Markov transition values may be utilized to shape UWB or other signals to achieve the desired power spectrum.Type: GrantFiled: January 12, 2007Date of Patent: May 19, 2009Assignee: Alereon, Inc.Inventors: James L. Lansford, Shyam Sunder Uma Chander
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Patent number: 7184938Abstract: Systems and methods for the design or implementation of statistical filters for use in the spectral shaping of transmissions are disclosed. A desired power spectrum may be mapped to find pole locations that approximate the desired spectrum. These pole locations may then be mapped to the edge or inside of an equilateral polygon lying inside a unit circle, the equilateral polygon having the same number of sides as the order of the statistical filter desired and one vertex mapped to unity, to yield a set of eigenvalues. These eigenvalues may be the eigenvalues of a stochastic matrix the elements of which may be the Markov transition probabilities for use in a statistical filter designed to achieve the desired power spectrum. Use of a statistical filter employing these Markov transition values may be utilized to shape UWB or other signals to achieve the desired power spectrum.Type: GrantFiled: September 1, 2005Date of Patent: February 27, 2007Assignee: Alereon, Inc.Inventors: James L. Lansford, Shyam Sunder Chander
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Patent number: 6937158Abstract: A first device operates at a first hopping frequency during a first period of time and operates at a second hopping frequency during a second period of time. A second device operates at the first hopping frequency and communicates with the first device during the first period of time. A third device operates at the second hopping frequency and communicates with the first device during the second period of time. The second period of time may be a contention-free period during which time the second device may not communicate with the first device.Type: GrantFiled: December 29, 1999Date of Patent: August 30, 2005Assignee: Intel CorporationInventors: James L. Lansford, Jon W. T. Inouye, Debashis Chowdhury
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Patent number: 6751251Abstract: A non-frequency-hopping node and a method for using such a node to transmit and receive data in a frequency-hopping system are disclosed. In one embodiment, a non-frequency-hopping node interacts with a frequency-hopping spread-spectrum (FHSS) system, which comprises a wireless medium or electromagnetic airwaves, a frequency-hopping node coupled to the wireless medium and an access point coupled to the wireless medium. The non-frequency-hopping node connects to the wireless medium and listens for an active signal generated by the FHSS system on a predetermined frequency channel. Upon detecting the active signal, the non-frequency-hopping node exchanges information with the FHSS system on the predetermined frequency channel.Type: GrantFiled: May 13, 2003Date of Patent: June 15, 2004Assignee: Intel CorporationInventor: James L. Lansford
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Publication number: 20030193991Abstract: A non-frequency-hopping node and a method for using such a node to transmit and receive data in a frequency-hopping system are disclosed.Type: ApplicationFiled: May 13, 2003Publication date: October 16, 2003Inventor: James L. Lansford
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Publication number: 20030178984Abstract: A first device operates at a first hopping frequency during a first period of time and operates at a second hopping frequency during a second period of time. A second device operates at the first hopping frequency and communicates with the first device during the first period of time. A third device operates at the second hopping frequency and communicates with the first device during the second period of time. The second period of time may be a contention-free period during which time the second device may not communicate with the first device.Type: ApplicationFiled: December 29, 1999Publication date: September 25, 2003Inventors: JAMES L. LANSFORD, JON W. T. INOUYE, DEBASHIS CHOWDHURY
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Patent number: 6594302Abstract: A non-frequency-hopping node and a method for using such a node to transmit and receive data in a frequency-hopping system are disclosed. In one embodiment, a non-frequency-hopping node interacts with a frequency-hopping spread-spectrum (FHSS) system, which comprises a wireless medium or electromagnetic airwaves, a frequency-hopping node coupled to the wireless medium and an access point coupled to the wireless medium. The non-frequency-hopping node connects to the wireless medium and listens for an active signal generated by the FHSS system on a predetermined frequency channel. Upon detecting the active signal, the non-frequency-hopping node exchanges information with the FHSS system on the predetermined frequency channel.Type: GrantFiled: August 13, 1999Date of Patent: July 15, 2003Assignee: Intel CorporationInventor: James L. Lansford
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Patent number: 6343071Abstract: A wireless communication system for receiving and transmitting serial bus data packets in conformance with a CSMA/CA protocol implemented in an ACCESS.bus serial bus data protocol which may accommodate either RF or IR transmissions for peer-to-peer communications between computers and between peripherals, as well as computer-to-peripheral and peripheral-to-computer communications.Type: GrantFiled: July 10, 1997Date of Patent: January 29, 2002Assignee: Simtek CorporationInventor: James L Lansford