Patents by Inventor Chandrasekar Sankaran
Chandrasekar Sankaran 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: 11528720Abstract: A method of determining a sequence of actions includes training a first deep Q-network (DQN); providing a plurality of entries of a first multi-dimensional matrix as input to the DQN, the first matrix representing a first state, each entry of the first matrix representing an action that can be taken in the first state; determining, using the first DQN, a plurality of Q-values for the plurality of entries of the first matrix, respectively; executing a first action, the first action being the action represented by the entry, from among the plurality of entries, for which the first DQN determined the highest Q-value among the plurality of determined Q-values; accumulating a reward based on executing the first action; and transitioning from the first state to a next state in accordance with a first set of rules and the executed first action.Type: GrantFiled: March 27, 2018Date of Patent: December 13, 2022Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventor: Chandrasekar Sankaran
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Publication number: 20220045726Abstract: Systems, methods, apparatuses, and computer program products for scheduling radio resources across a group of one or more user equipment (UEs) are provided. One method may include encoding every sequence of multi-user multiple-input multiple-output (MU MIMO) beam combinations into a unique numerical value, adding a Q value into the encoded numerical value to produce a Q encoded value (Qencoded), providing each of the sequence of beam combinations with a unique designated bin, passing a matrix comprising a state representation for each of the beam combinations through a deep Q network (DQN), and outputting, by the deep Q network (DQN), one or more optimal beams to assign to a user equipment (UE).Type: ApplicationFiled: November 5, 2019Publication date: February 10, 2022Inventor: Chandrasekar SANKARAN
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Publication number: 20210218460Abstract: Systems, methods, apparatuses, and computer program products for multi-user (MU) multiple-input multiple-output (MIMO) user pairing selection are provided. One method may include selecting multi-user multiple input multiple output (MU MIMO) candidate beams using deep neural network(s) (DNNs), and selecting paired users based on the selected beams. The deep neural network(s) (DNNs) are trained to maximize multi-user priority metric (MU-PM) or a heuristic of the multi-user priority metric (MU-PM).Type: ApplicationFiled: June 20, 2019Publication date: July 15, 2021Inventors: Ian Dexter GARCIA, Igor FILIPOVICH, Chandrasekar SANKARAN, Hua XU, Suresh KALYANASUNDARAM, Jamil SHIHAB, Rajeev AGRAWAL, Anand BEDEKAR
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Publication number: 20210014872Abstract: A method of determining a sequence of actions includes training a first deep Q-network (DQN); providing a plurality of entries of a first multi-dimensional matrix as input to the DQN, the first matrix representing a first state, each entry of the first matrix representing an action that can be taken in the first state; determining, using the first DQN, a plurality of Q-values for the plurality of entries of the first matrix, respectively; executing a first action, the first action being the action represented by the entry, from among the plurality of entries, for which the first DQN determined the highest Q-value among the plurality of determined Q-values; accumulating a reward based on executing the first action; and transitioning from the first state to a next state in accordance with a first set of rules and the executed first action.Type: ApplicationFiled: March 27, 2018Publication date: January 14, 2021Applicant: Nokia Solutions and Networks OyInventor: Chandrasekar SANKARAN
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Patent number: 9078224Abstract: The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for a power control (e.g., at least for DL power control) in a cell using a concept of a relative load in a network such as a wireless network. The relative load may be a ratio of cell's own load relative to an average load in a cluster of neighboring cells for scaling a nominal power value (or a function of the power value). The load can be measured, for example, either as a number of UEs in the cell, a RB utilization in the cell, a DL information traffic in the cell, or any other metric that's representative of the load in the cell. The resulting computed power for a DL signaling can be either on a per cell basis or on a per UE basis.Type: GrantFiled: January 3, 2013Date of Patent: July 7, 2015Assignee: Nokia Solutions and Networks OyInventors: Chandrasekar Sankaran, Philip Fleming, Eugene Visotsky, Michael Honig
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Publication number: 20140187282Abstract: The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for a power control (e.g., at least for DL power control) in a cell using a concept of a relative load in a network such as a wireless network. The relative load may be a ratio of cell's own load relative to an average load in a cluster of neighboring cells for scaling a nominal power value (or a function of the power value). The load can be measured, for example, either as a number of UEs in the cell, a RB utilization in the cell, a DL information traffic in the cell, or any other metric that's representative of the load in the cell. The resulting computed power for a DL signaling can be either on a per cell basis or on a per UE basis.Type: ApplicationFiled: January 3, 2013Publication date: July 3, 2014Applicant: Nokia Siemens Networks OyInventors: Chandrasekar Sankaran, Philip Fleming, Eugene Visotsky, Michael Honig
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Patent number: 8644288Abstract: A method, system and communication network for transmitting information signals via uplink (UL) collaborative SDMA, in a wireless communication system. Base station receiver estimates a channel gain associated with the transmission path(s) of each user and keeps a matrix of normalized covariance, between users. Based on the estimated channel gain and the normalized covariance, ULS utility is able to compute channel capacity. Based on capacity estimates of (1) the multiplexed user signals and (2) the individual user signals, signals are either multiplexed for UL SDMA or are transmitted individually. An optimal selection of multiplexed signals may be based upon: (1) a cross user interface measurement; and (2) a selection mechanism based on eigen-decomposition techniques. The ULS utility enables a UL scheduler to pair information signals with clear spatial distinction and minimal correlation, based on capacity evaluations.Type: GrantFiled: July 31, 2008Date of Patent: February 4, 2014Assignee: Motorola Mobility LLCInventors: Fan Wang, Stanley J. Benes, Amitabha Ghosh, Chandrasekar Sankaran, Timothy J. Wilson, Fei Tong, Nick W. Whinnett
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Patent number: 8559294Abstract: An OFDMA communication system is provided that schedules partial usage of subchannels (PUSC) major groups by assigning a beam matrix of a plurality of beam matrices to each major group of multiple PUSC major groups, receiving an uplink signal from each user equipment of multiple users equipment, which uplink signal provides an indication of a channel response associated with the user equipment, determining, for each user equipment of the multiple users equipment and based on the indication of channel quality received from the user equipment, a beam matrix and major group to which to assign the user equipment, and based on the determination of a beam matrix and major group to which to assign each user equipment of the multiple users equipment, assigning two or more users equipment of the multiple users equipment to a same beam matrix and major group during a same time slot.Type: GrantFiled: July 29, 2010Date of Patent: October 15, 2013Assignee: Motorola Mobility LLCInventors: Frederick W. Vook, Alan P. Rottinghaus, Chandrasekar Sankaran
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Patent number: 8199713Abstract: An apparatus and method for fractional frequency reuse in a communication system. The method includes a first step 400 of partitioning a sub-frame into resource partitions, wherein at least one resource partition has frequency reuse of one and all other resource partitions have frequency reuse greater than one. A next step 408 includes scheduling resources for a mobile station in a sector in each resource partition used by that sector.Type: GrantFiled: November 3, 2009Date of Patent: June 12, 2012Assignee: Motorola Mobility, Inc.Inventors: Chandrasekar Sankaran, Stanley J. Benes, Philip J. Fleming
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Publication number: 20120027111Abstract: An OFDMA communication system is provided that schedules partial usage of subchannels (PUSC) major groups by assigning a beam matrix of a plurality of beam matrices to each major group of multiple PUSC major groups, receiving an uplink signal from each user equipment of multiple users equipment, which uplink signal provides an indication of a channel response associated with the user equipment, determining, for each user equipment of the multiple users equipment and based on the indication of channel quality received from the user equipment, a beam matrix and major group to which to assign the user equipment, and based on the determination of a beam matrix and major group to which to assign each user equipment of the multiple users equipment, assigning two or more users equipment of the multiple users equipment to a same beam matrix and major group during a same time slot.Type: ApplicationFiled: July 29, 2010Publication date: February 2, 2012Applicant: MOTOROLA, INC.Inventors: Frederick W. Vook, Alan P. Rottinghaus, Chandrasekar Sankaran
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Patent number: 8055198Abstract: An apparatus and method to provide uplink interference control in a WiMAX communication system includes a step 302 of receiving a downlink channel quality indication from an MS. A next step 304 selecting a modulation product ratio modification parameter in response to the channel quality indication. A next step 306 includes modifying a modulation product ratio by the modification parameter. A next step 308 includes mapping the modified modulation product ratio against a table of modulation coding schemes. A next step 312 includes applying the mapped modulation coding scheme.Type: GrantFiled: August 27, 2008Date of Patent: November 8, 2011Assignee: Motorola Mobility, Inc.Inventors: Stanley J. Benes, Chandrasekar Sankaran, Fan Wang
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Publication number: 20110103365Abstract: An apparatus and method for fractional frequency reuse in a communication system. The method includes a first step 400 of partitioning a sub-frame into resource partitions, wherein at least one resource partition has frequency reuse of one and all other resource partitions have frequency reuse greater than one. A next step 408 includes scheduling resources for a mobile station in a sector in each resource partition used by that sector.Type: ApplicationFiled: November 3, 2009Publication date: May 5, 2011Applicant: MOTOROLA, INC.Inventors: Chandrasekar Sankaran, Stanley J. Benes, Philip J. Fleming
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Publication number: 20100056057Abstract: An apparatus and method to provide uplink interference control in a WiMAX communication system includes a step 302 of receiving a downlink channel quality indication from an MS. A next step 304 selecting a modulation product ratio modification parameter in response to the channel quality indication. A next step 306 includes modifying a modulation product ratio by the modification parameter. A next step 308 includes mapping the modified modulation product ratio against a table of modulation coding schemes. A next step 312 includes applying the mapped modulation coding scheme.Type: ApplicationFiled: August 27, 2008Publication date: March 4, 2010Applicant: MOTOROLA, INC.Inventors: Stanley J. Benes, Chandrasekar Sankaran, Fan Wang
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Publication number: 20100029288Abstract: A method, system and communication network for transmitting information signals via uplink (UL) collaborative SDMA, in a wireless communication system. Base station receiver estimates a channel gain associated with the transmission path(s) of each user and keeps a matrix of normalized covariance, between users. Based on the estimated channel gain and the normalized covariance, ULS utility is able to compute channel capacity. Based on capacity estimates of (1) the multiplexed user signals and (2) the individual user signals, signals are either multiplexed for UL SDMA or are transmitted individually. An optimal selection of multiplexed signals may be based upon: (1) a cross user interface measurement; and (2) a selection mechanism based on eigen-decomposition techniques. The ULS utility enables a UL scheduler to pair information signals with clear spatial distinction and minimal correlation, based on capacity evaluations.Type: ApplicationFiled: July 31, 2008Publication date: February 4, 2010Applicant: MOTOROLA, INC.Inventors: Fan Wang, Stanley J. Benes, Amitabha Ghosh, Chandrasekar Sankaran, Timothy J. Wilson, Fei Tong, Nick W. Whinnett
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Publication number: 20090147735Abstract: A wireless communications method and device including a transmitter (130) configured to transmit according to an Orthogonal Frequency Division Multiplexing transmission standard (300), such as the WiMAX standard. The wireless communications device (120) includes a transmission bandwidth controller (136) adapted to configure the transmitter (130) to adjust a transmitted bandwidth (312) by at least one of 1) configuring at least one of a first set of punctured subcarriers (324) and a second set of punctured subcarriers (326) to not be used for data transmission. The first set of punctured subcarriers and the second set of punctured subcarriers are located within opposite edges of the transmission bandwidth (340); and 2) configuring at least a first set of guardband subcarriers (322) and a second set of guardband subcarriers (330), which are located on opposite edges of the transmission bandwidth, to be used for data transmission.Type: ApplicationFiled: December 5, 2007Publication date: June 11, 2009Applicant: MOTOROLA, INC.Inventors: Amitava Ghosh, Gregory M. Agami, Chandrasekar Sankaran, Fan Wang, Weidong Yang
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Patent number: 7489755Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.Type: GrantFiled: February 9, 2005Date of Patent: February 10, 2009Assignee: Motorola, Inc.Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
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Patent number: 7477699Abstract: A radio communications device (102) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device (104) that has multiple transmit antennas. A channel throughput (402-412, 450-454) for each transmission technique is estimated based on signal to interference and noise ratios (502-512, 550-554) of signals being transmitted through a MIMO channel (140) as measured by a receiver (708). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.Type: GrantFiled: December 20, 2006Date of Patent: January 13, 2009Assignee: Motorola, Inc.Inventors: Fan Wang, Lawrence A. Downing, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
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Publication number: 20080151804Abstract: A radio communications device (102) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device (104) that has multiple transmit antennas. A channel throughput (402-412, 450-454) for each transmission technique is estimated based on signal to interference and noise ratios (502-512, 550-554) of signals being transmitted through a MIMO channel (140) as measured by a receiver (708). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.Type: ApplicationFiled: December 20, 2006Publication date: June 26, 2008Applicant: MOTOROLA, INC.Inventors: Fan Wang, Lawrence A. Downing, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
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Publication number: 20060176936Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.Type: ApplicationFiled: February 9, 2005Publication date: August 10, 2006Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan