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).

  • Publication number: 20210218460
    Abstract: 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: Application
    Filed: June 20, 2019
    Publication date: July 15, 2021
    Inventors: Ian Dexter GARCIA, Igor FILIPOVICH, Chandrasekar SANKARAN, Hua XU, Suresh KALYANASUNDARAM, Jamil SHIHAB, Rajeev AGRAWAL, Anand BEDEKAR
  • Publication number: 20210014872
    Abstract: 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: Application
    Filed: March 27, 2018
    Publication date: January 14, 2021
    Applicant: Nokia Solutions and Networks Oy
    Inventor: Chandrasekar SANKARAN
  • Patent number: 9078224
    Abstract: 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: Grant
    Filed: January 3, 2013
    Date of Patent: July 7, 2015
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Chandrasekar Sankaran, Philip Fleming, Eugene Visotsky, Michael Honig
  • Publication number: 20140187282
    Abstract: 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: Application
    Filed: January 3, 2013
    Publication date: July 3, 2014
    Applicant: Nokia Siemens Networks Oy
    Inventors: Chandrasekar Sankaran, Philip Fleming, Eugene Visotsky, Michael Honig
  • Patent number: 8644288
    Abstract: 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: Grant
    Filed: July 31, 2008
    Date of Patent: February 4, 2014
    Assignee: Motorola Mobility LLC
    Inventors: Fan Wang, Stanley J. Benes, Amitabha Ghosh, Chandrasekar Sankaran, Timothy J. Wilson, Fei Tong, Nick W. Whinnett
  • Patent number: 8559294
    Abstract: 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: Grant
    Filed: July 29, 2010
    Date of Patent: October 15, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Frederick W. Vook, Alan P. Rottinghaus, Chandrasekar Sankaran
  • Patent number: 8199713
    Abstract: 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: Grant
    Filed: November 3, 2009
    Date of Patent: June 12, 2012
    Assignee: Motorola Mobility, Inc.
    Inventors: Chandrasekar Sankaran, Stanley J. Benes, Philip J. Fleming
  • Publication number: 20120027111
    Abstract: 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: Application
    Filed: July 29, 2010
    Publication date: February 2, 2012
    Applicant: MOTOROLA, INC.
    Inventors: Frederick W. Vook, Alan P. Rottinghaus, Chandrasekar Sankaran
  • Patent number: 8055198
    Abstract: 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: Grant
    Filed: August 27, 2008
    Date of Patent: November 8, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Stanley J. Benes, Chandrasekar Sankaran, Fan Wang
  • Publication number: 20110103365
    Abstract: 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: Application
    Filed: November 3, 2009
    Publication date: May 5, 2011
    Applicant: MOTOROLA, INC.
    Inventors: Chandrasekar Sankaran, Stanley J. Benes, Philip J. Fleming
  • Publication number: 20100056057
    Abstract: 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: Application
    Filed: August 27, 2008
    Publication date: March 4, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Stanley J. Benes, Chandrasekar Sankaran, Fan Wang
  • Publication number: 20100029288
    Abstract: 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: Application
    Filed: July 31, 2008
    Publication date: February 4, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Fan Wang, Stanley J. Benes, Amitabha Ghosh, Chandrasekar Sankaran, Timothy J. Wilson, Fei Tong, Nick W. Whinnett
  • Publication number: 20090147735
    Abstract: 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: Application
    Filed: December 5, 2007
    Publication date: June 11, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Amitava Ghosh, Gregory M. Agami, Chandrasekar Sankaran, Fan Wang, Weidong Yang
  • Patent number: 7489755
    Abstract: 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: Grant
    Filed: February 9, 2005
    Date of Patent: February 10, 2009
    Assignee: Motorola, Inc.
    Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
  • Patent number: 7477699
    Abstract: 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: Grant
    Filed: December 20, 2006
    Date of Patent: January 13, 2009
    Assignee: Motorola, Inc.
    Inventors: Fan Wang, Lawrence A. Downing, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
  • Publication number: 20080151804
    Abstract: 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: Application
    Filed: December 20, 2006
    Publication date: June 26, 2008
    Applicant: MOTOROLA, INC.
    Inventors: Fan Wang, Lawrence A. Downing, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
  • Publication number: 20060176936
    Abstract: 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: Application
    Filed: February 9, 2005
    Publication date: August 10, 2006
    Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan