Patents by Inventor David Damian Nicholas Bevan
David Damian Nicholas Bevan 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: 20210203422Abstract: A location of at least one PIM source within an antenna array assembly is determined by applying an excitation waveform to a connection port, setting a multi-element phase shifter to a first state to apply a respective phase shift to respective paths, and making a first measurement of at least the phase of a PIM product emitted from the connection port. The multi-element phase shifter is then set to a succession of further states and further such measurements are made for each of the further states. From the first and further measurements a dependence is determined of at least the phase of the PIM product on the state of the multi-element phase shifter. The determined dependence is compared with a plurality of predetermined dependences, each predetermined dependence being for a PIM source located in a respective path between the multi-element phase shifter and a respective sub-array to determine the location within the antenna array assembly of the at least one PIM source.Type: ApplicationFiled: December 18, 2020Publication date: July 1, 2021Inventors: Simon GALE, David Damian Nicholas BEVAN
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Patent number: 10263713Abstract: A location is identified of at least one PIM (passive intermodulation) source in a frequency selective device by applying an excitation waveform to the frequency selective device and measuring a PIM response signature of the frequency selective device. The PIM response signature is a characteristic of PIM produced in response to the excitation waveform. The measured PIM response signature is compared with each of a plurality of example PIM response signatures, each of the plurality of example PIM response signatures corresponding to a characteristic of PIM expected for a respective location of a PIM source in the frequency selective device. The location of the at least one PIM source within the frequency selective device is determined on the basis of the comparison.Type: GrantFiled: November 14, 2017Date of Patent: April 16, 2019Assignee: AceAxis LimitedInventors: Simon Gale, David Damian Nicholas Bevan, Fiona Wilson, Nigel Chapman
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Patent number: 10158389Abstract: A method of processing interference received in a wireless network, the interference comprising a non-linear product of at least one downlink signal of the wireless network, is provided. The method includes intercepting a plurality of optical links, each optical link being between a respective baseband processing unit of a plurality of baseband processing units and a respective radio head of a plurality of radio heads, to provide a plurality of downlink and uplink data streams. The method includes detecting interference in an uplink data stream representing signals received at a first uplink carrier frequency caused by non-linear products of at least a signal at a first downlink carrier frequency represented by a downlink data stream. The method includes generating an indication comprising information relating to an uplink carrier frequency experiencing interference and at least one downlink carrier frequency causing interference.Type: GrantFiled: June 23, 2017Date of Patent: December 18, 2018Assignee: ACEAXIS LIMITEDInventors: Simon John Gale, David Damian Nicholas Bevan, Fiona Wilson, James Mark Naden
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Publication number: 20180219636Abstract: A location is identified of at least one PIM (passive intermodulation) source in a frequency selective device by applying an excitation waveform to the frequency selective device and measuring a PIM response signature of the frequency selective device. The PIM response signature is a characteristic of PIM produced in response to the excitation waveform. The measured PIM response signature is compared with each of a plurality of example PIM response signatures, each of the plurality of example PIM response signatures corresponding to a characteristic of PIM expected for a respective location of a PIM source in the frequency selective device. The location of the at least one PIM source within the frequency selective device is determined on the basis of the comparison.Type: ApplicationFiled: November 14, 2017Publication date: August 2, 2018Inventors: Simon GALE, David Damian Nicholas BEVAN, Fiona WILSON
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Patent number: 10039021Abstract: A PIM (passive intermodulation) diagnosis is generated for one or more wireless networks which have equipment deployed at a plurality of cell sites. Data is received representing PIM detection results from PIM detection devices at the cell sites, the detected PIM including PIM caused by passive intermodulation between carriers of the one or more wireless networks. The data representing respective PIM detection results is normalized to account for transmission power and frequency allocation of respective cell sites, and the normalized data representing respective PIM detection results is correlated with data relating to a condition of respective cell sites and/or an environment of the respective cell sites to produce correlation results. The PIM diagnosis is generated in dependence on the correlation results.Type: GrantFiled: May 27, 2015Date of Patent: July 31, 2018Assignee: ACEAXIS LIMITEDInventors: Fiona Wilson, Simon Gale, David Damian Nicholas Bevan, Stephen Cooper
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Patent number: 9882591Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: GrantFiled: July 13, 2016Date of Patent: January 30, 2018Assignee: ACEAXIS LIMITEDInventors: David Damian Nicholas Bevan, Simon Gale, Fiona Wilson
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Publication number: 20170294928Abstract: A method of processing interference received in a wireless network, the interference comprising a non-linear product of at least one downlink signal of the wireless network, is provided. The method includes intercepting a plurality of optical links, each optical link being between a respective baseband processing unit of a plurality of baseband processing units and a respective radio head of a plurality of radio heads, to provide a plurality of downlink and uplink data streams. The method includes detecting interference in an uplink data stream representing signals received at a first uplink carrier frequency caused by non-linear products of at least a signal at a first downlink carrier frequency represented by a downlink data stream. The method includes generating an indication comprising information relating to an uplink carrier frequency experiencing interference and at least one downlink carrier frequency causing interference.Type: ApplicationFiled: June 23, 2017Publication date: October 12, 2017Inventors: Simon John GALE, David Damian Nicholas BEVAN, Fiona WILSON, James Mark NADEN
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Publication number: 20160322995Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: ApplicationFiled: July 13, 2016Publication date: November 3, 2016Inventors: David Damian Nicholas BEVAN, Simon GALE, Fiona WILSON
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Patent number: 9420479Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: GrantFiled: September 26, 2014Date of Patent: August 16, 2016Assignee: ACEAXIS LIMITEDInventors: David Damian Nicholas Bevan, Simon Gale, Fiona Wilson
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Patent number: 9414245Abstract: Interference comprising an intermodulation product of at least a first signal and a second signal is detected in a wireless network, by generating, on the basis of at least the first signal and the second signal, at least one interference signal comprising a simulated intermodulation product and correlating the at least one interference signal with a waveform received in the wireless system to produce data representing a correlation. The presence of an intermodulation product of at least the first signal and the second signal is detected in the interference in dependence on the data representative of the correlation.Type: GrantFiled: January 22, 2015Date of Patent: August 9, 2016Assignee: ACEAXIS LIMITEDInventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
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Publication number: 20150350940Abstract: A PIM (passive intermodulation) diagnosis is generated for one or more wireless networks which have equipment deployed at a plurality of cell sites. Data is received representing PIM detection results from PIM detection devices at the cell sites, the detected PIM including PIM caused by passive intermodulation between carriers of the one or more wireless networks. The data representing respective PIM detection results is normalized to account for transmission power and frequency allocation of respective cell sites, and the normalized data representing respective PIM detection results is correlated with data relating to a condition of respective cell sites and/or an environment of the respective cell sites to produce correlation results. The PIM diagnosis is generated in dependence on the correlation results.Type: ApplicationFiled: May 27, 2015Publication date: December 3, 2015Inventors: Fiona WILSON, Simon GALE, David Damian Nicholas BEVAN, Stephen COOPER
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Publication number: 20150333784Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: ApplicationFiled: September 26, 2014Publication date: November 19, 2015Inventors: David Damian Nicholas BEVAN, Simon GALE, Fiona WILSON
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Publication number: 20150133111Abstract: Interference comprising an intermodulation product of at least a first signal and a second signal is detected in a wireless network, by generating, on the basis of at least the first signal and the second signal, at least one interference signal comprising a simulated intermodulation product and correlating the at least one interference signal with a waveform received in the wireless system to produce data representing a correlation. The presence of an intermodulation product of at least the first signal and the second signal is detected in the interference in dependence on the data representative of the correlation.Type: ApplicationFiled: January 22, 2015Publication date: May 14, 2015Inventors: David Damian Nicholas BEVAN, Simon John GALE, Fiona Maihri WILSON
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Patent number: 8983454Abstract: Interference comprising a passive intermodulation (PIM) product of at least a first signal and a second signal is detected in a wireless network, by generating, on the basis of at least the first signal and the second signal, at least one interference signal comprising a simulated intermodulation product and correlating the at least one interference signal with a waveform received in the wireless system to produce data representing a correlation. The presence of an intermodulation product of at least the first signal and the second signal is detected in the interference in dependence on the data representative of the correlation.Type: GrantFiled: August 13, 2012Date of Patent: March 17, 2015Assignee: Aceaxis LimitedInventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
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Patent number: 8874153Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: GrantFiled: August 13, 2012Date of Patent: October 28, 2014Assignee: Aceaxis LimitedInventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
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Patent number: 8868095Abstract: System and methods of cellular communications network are described herein. In one system, an antenna array is described. The antenna array has a first beamforming arrangement for producing uplink beams and a second beamforming arrangement for producing downlink beams. The first and second beamforming arrangements are different from one another. The wireless communication network communicates with a mobile station by use of the uplink and downlink beamforming arrangements.Type: GrantFiled: February 28, 2013Date of Patent: October 21, 2014Assignee: Apple Inc.Inventors: Martin Stevens Smith, Andrew James Urquhart, Julius George Robson, David Damian Nicholas Bevan
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Publication number: 20130310023Abstract: Interference comprising an intermodulation product of at least a first signal and a second signal is detected in a wireless network, by generating, on the basis of at least the first signal and the second signal, at least one interference signal comprising a simulated intermodulation product and correlating the at least one interference signal with a waveform received in the wireless system to produce data representing a correlation. The presence of an intermodulation product of at least the first signal and the second signal is detected in the interference in dependence on the data representative of the correlation.Type: ApplicationFiled: August 13, 2012Publication date: November 21, 2013Applicant: ACEAXIS LIMITEDInventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
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Publication number: 20130310090Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.Type: ApplicationFiled: August 13, 2012Publication date: November 21, 2013Applicant: ACEAXIS LIMITEDInventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
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Patent number: 8230294Abstract: In a decoder implementing a belief propagation algorithm for iteratively decoding a Low Density Parity Check (LDPC) encoded data block, a method of computing messages to be sent by a first node of the decoder to at least one neighbor node of the decoder. The method comprises: processing messages received by the first node to remove an echo of a previous message sent by the first node to the at least one neighbor node in a previous iteration, to yield corresponding modified messages; computing a message for a current iteration using the modified messages; and broadcasting the computed message for the current iteration to each of the at least one neighbor nodes.Type: GrantFiled: July 30, 2008Date of Patent: July 24, 2012Assignee: Ciena CorporationInventors: Kim B. Roberts, Manoj Verghese, James Harley, David Damian Nicholas Bevan
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Patent number: 7783258Abstract: The invention is directed to a method of synchronising transmission between two nodes in a wireless network. The method comprises the steps of obtaining an expected interference profile for each node; and agreeing a synchronised transmission schedule between the nodes, where the expected interference profile of each node meets predetermined criteria.Type: GrantFiled: October 10, 2003Date of Patent: August 24, 2010Assignee: Nortel Networks LimitedInventors: David Damian Nicholas Bevan, Steven John Baines, Simon John Gale