Patents by Inventor Baskaran Dhivagar
Baskaran Dhivagar 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: 9312978Abstract: Embodiments disclosed herein reduce interference at pilot symbols and also enable good interference measurements by using a combination pilot tones and null tones along with null tones. In this type of system, the receivers estimate the channel state information without any strong interference from the neighboring transmitters, and at the same time it can also measure either the individual interference channel states or the interference covariances from the silent periods. It uses these measurements thus obtained to calculate the post processing SINR, and then compute and report the wideband and subband CQIs to the transmitter. The groups of transmitters are reused in geographically separated region using a frequency reuse structure. In a preferred implementation, pilot signal is precoded using a multi-antenna precoder. The precoder may be same for pilot and data.Type: GrantFiled: April 12, 2015Date of Patent: April 12, 2016Assignee: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Jeniston Deviraj Klutto Milleth, Vinod Ramaswamy, Baskaran Dhivagar, Dileep Manisseri Kalathil, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Geordie George, Prasanth Karunakaran, Yerrapareddy Sivakishore Reddy
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Patent number: 9225575Abstract: Precoding for multiple transmission streams in multiple antenna systems. Disclosed herein is a general method that transmits signal from multiple antennas using a one/two dimensional precoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: GrantFiled: June 9, 2015Date of Patent: December 29, 2015Assignee: Center of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Publication number: 20150271003Abstract: Precoding for multiple transmission streams in multiple antenna systems. Disclosed herein is a general method that transmits signal from multiple antennas using a one/two dimensional precoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: ApplicationFiled: June 9, 2015Publication date: September 24, 2015Inventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Publication number: 20150215063Abstract: Embodiments disclosed herein reduce interference at pilot symbols and also enable good interference measurements by using a combination pilot tones and null tones along with null tones. In this type of system, the receivers estimate the channel state information without any strong interference from the neighboring transmitters, and at the same time it can also measure either the individual interference channel states or the interference covariances from the silent periods. It uses these measurements thus obtained to calculate the post processing SINR, and then compute and report the wideband and subband CQIs to the transmitter. The groups of transmitters are reused in geographically separated region using a frequency reuse structure. In a preferred implementation, pilot signal is precoded using a multi-antenna precoder. The precoder may be same for pilot and data.Type: ApplicationFiled: April 12, 2015Publication date: July 30, 2015Applicant: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Jeniston Deviraj Klutto Milleth, Vinod Ramaswamy, Baskaran Dhivagar, Dileep Manisseri Kalathil, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Geordie George, Prasanth Karunakaran, Yerrapareddy Sivakishore Reddy
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Patent number: 9083399Abstract: Precoding for multiple transmission streams in multiple antenna systems. Disclosed herein is a general method that transmits signal from multiple antennas using a one/two dimensional precoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: GrantFiled: June 18, 2009Date of Patent: July 14, 2015Assignee: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Patent number: 9030992Abstract: Embodiments disclosed herein reduce interference at pilot symbols and also enable good interference measurements by using a combination pilot tones and null tones along with null tones. In this type of system, the receivers can estimate tile channel state information without any interference from the remaining transmitters and at the same time the receiver can measure either the individual interference channel states or the interference covariances from the silent periods. The groups of transmitters are reused in geographically separated region using a frequency reuse structure. In a preferred implementation, pilot signal is precoded using a multi-antenna precoder. The precoder may be same for pilot and data.Type: GrantFiled: March 3, 2010Date of Patent: May 12, 2015Assignee: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Jeniston Deviraj Klutto Milleth, Vinod Ramaswamy, Baskaran Dhivagar, Dileep Manisseri Kalathil, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Geordie George, Prasanth Karunakaran, Yerrapareddy Sivakishore Reddy
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Patent number: 8902831Abstract: Embodiments herein provide methods and systems for enhancing interference mitigation using conjugate symbol repetition and phase randomization on a set of subcarriers. The repeated data tone in the signal is complex-conjugated before transmission, when the repetition factor is two. When the repetition factor is greater than two, a combination of conjugate repetition and random/deterministic phase variation of the repeated tones is used to mitigate the interference mitigation. Embodiments further disclose Collision Free Interlaced Pilot PRU Structures that can be used with or without conjugate symbol repetition and phase randomization for interference mitigation.Type: GrantFiled: June 17, 2009Date of Patent: December 2, 2014Assignee: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Dileep Manisseri Kalathil
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Patent number: 8699446Abstract: Precoding for multiple transmission streams in multiple antenna systems. Embodiments herein disclose a general method that transmits signal from multiple antennas using a one/two dimensional precoder followed by STBC/SFBC or SM encoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or 5 equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: GrantFiled: June 18, 2009Date of Patent: April 15, 2014Assignee: Centre of Excellence In Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Publication number: 20120014476Abstract: Embodiments disclosed herein reduce interference at pilot symbols and also enable good interference measurements by using a combination pilot tones and null tones along with null tones. In this type of system, the receivers can estimate tile channel state information without any interference from the remaining transmitters and at the same time the receiver can measure either the individual interference channel states or the interference covariances from the silent periods. The groups of transmitters are reused in geographically separated region using a frequency reuse structure. In a preferred implementation, pilot signal is precoded using a multi-antenna precoder. The precoder may be same for pilot and data.Type: ApplicationFiled: March 3, 2010Publication date: January 19, 2012Applicant: CENTRE OF EXCELLENCE IN WIRELESS TECHNOLOGYInventors: Kiran Kumar Kuchi, Jeniston Deviraj Klutto Milleth, Vinod Ramaswamy, Baskaran Dhivagar, Dileep Manisseri Kalathil, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Geordie George, Prasanth Karunakaran, Yerrapareddy Sivakishore Reddy
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Publication number: 20110141876Abstract: Precoding for multiple transmission streams in multiple antenna systems. Disclosed herein is a general method that transmits signal from multiple antennas using a one/two dimensional precoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: ApplicationFiled: June 18, 2009Publication date: June 16, 2011Inventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Publication number: 20110142003Abstract: Precoding for multiple transmission streams in multiple antenna systems. Embodiments herein disclose a general method that transmits signal from multiple antennas using a one/two dimensional precoder followed by STBC/SFBC or SM encoder. This precoder is fixed in a given resource block (RB) or slot, which is composed of P subcarriers and Q OFDM symbols (where the values for P and Q are greater than or 5 equal to 1). The precoder in each resource block may take same or different values, which span the two dimensional time-frequency grid. The precoder is chosen as a function of either logical frequency index or physical frequency index of the RB.Type: ApplicationFiled: June 18, 2009Publication date: June 16, 2011Applicant: Centre of Excellence In Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Dileep Manisseri Kalathil, Padmanabhan Madampu Suryasarman
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Publication number: 20110110304Abstract: Embodiments herein provide methods and systems for enhancing interference mitigation using conjugate symbol repetition and phase randomization on a set of subcarriers. The repeated data tone in the signal is complex-conjugated before transmission, when the repetition factor is two. When the repetition factor is greater than two, a combination of conjugate repetition and random/deterministic phase variation of the repeated tones is used to mitigate the interference mitigation. Embodiments further disclose Collision Free Interlaced Pilot PRU Structures that can be used with or without conjugate symbol repetition and phase randomization for interference mitigation.Type: ApplicationFiled: June 17, 2009Publication date: May 12, 2011Applicant: Centre of Excellence in Wireless TechnologyInventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Dileep Manisseri Kalathil