Patents by Inventor Sridhar Rajagopal

Sridhar Rajagopal 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).

  • Patent number: 10440688
    Abstract: A relay node capable of supporting wireless backhaul communication includes a controller configured to identify a first timing of a backhaul downlink (DL) transmission and a second timing of an access uplink (UL) transmission to be substantially aligned, and a transceiver configured to receive at least one first symbol in the backhaul DL transmission from an base station (BS), and receive at least second symbol in an access UL transmission from a user equipment (UE). The controller is further configured to substantially align a third timing of a backhaul uplink (UL) transmission and a fourth timing of an access downlink (DL) transmission, wherein the transceiver is further configured to transmit at least third symbol in a backhaul uplink (UL) transmission to the BS, and transmit at least fourth symbol in the access DL transmission to the UE.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: October 8, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sudhir Ramakrishna, Boon Loong Ng, Li Guo, Thomas David Novlan, Young-Han Nam, Sridhar Rajagopal, Jianzhong Zhang
  • Publication number: 20190289497
    Abstract: There are provided systems, methods, and interfaces for optimization of the fronthaul interface bandwidth for Radio Access Networks and Cloud Radio Access Networks.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 19, 2019
    Applicant: MAVENIR NETWORKS, INC.
    Inventor: Sridhar RAJAGOPAL
  • Patent number: 10411780
    Abstract: Methods and apparatuses for association in a beamformed wireless area network (WLAN) are provided. A method for operating a station (STA) includes randomly selecting a plurality of sector sweep frames for association beam transmission within a frame-aligned transmit sector sweep duration in an association beamforming training duration of a beacon interval, transmitting a beam in each of the randomly selected sector sweep frames, and receiving sector sweep feedback from an access point (AP). A method for operating the AP includes receiving at least one transmission from one or more STAs on at least one of randomly selected sector sweep frames within the frame-aligned transmit sector sweep duration, selecting a sector identifier for transmissions from each of the one or more STAs based on the at least one received transmission, and transmitting grouped sector sweep feedback indicating the selected sector identifier for transmissions from each of the one or more STAs.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: September 10, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Rakesh Taori
  • Publication number: 20190254047
    Abstract: There is provided a system, method, and interfaces for Radio Access Networks and Cloud Radio Access Networks.
    Type: Application
    Filed: February 11, 2019
    Publication date: August 15, 2019
    Applicant: MAVENIR NETWORKS, INC.
    Inventors: Wessam Afifi AHMED, Sridhar RAJAGOPAL, Ajay NIGAM, Hersh Vardhan SHUKLA, Tarak TARANEKAR, Ajit Ashok JOSHI
  • Patent number: 10383147
    Abstract: The sensing method a first vehicle user equipment (UE) for collision avoidance in a wireless communication network comprises receiving a set of scheduling assignment (SA) information allocated to a set of second vehicle UEs, decoding the set of SA information, each of which includes SA information to each of the set of second vehicle UEs, performing energy sensing operation for resources to be used by each of the set of second vehicle UEs to determine additional potential SA transmission and data transmission from the set of second vehicle UEs over the resources, determining available resources for the data transmission from the first vehicle UE based on the performed energy sensing and SA sensing, skipping a channel sensing operation on at least one subframe that is used for the data transmission from the first vehicle UE, and transmitting data among resources identified as unused in next transmissions from second vehicle UEs.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: August 13, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Thomas David Novlan, Aris Papasakellariou
  • Publication number: 20190091749
    Abstract: A method of forming a strut includes providing a ring with a threaded section, coupling a mandrel to the ring, and electroforming a metallic layer over the mandrel and ring. The strut can include an integral monolithic body.
    Type: Application
    Filed: August 27, 2018
    Publication date: March 28, 2019
    Inventors: Sridhar Rajagopal, Sagar Paramashivaiah, Merin Sebastian, Sandeep Kumar, Dattu GuruVenkata Jonnalagadda
  • Patent number: 10194388
    Abstract: In a packet-based communication system, a transmitter and a receiver implement low power synchronization techniques. The transmitter transmits a packet that includes a two-part preamble. A first part of the two-part preamble is transmitted at a first reduced bandwidth that is smaller than a second bandwidth of the channel, and at least one of a second part of the two-part preamble and another portion of the packet is transmitted at the second bandwidth of the channel. The receiver includes an interleaved analog-to-digital converter (ADC) including multiple sub-ADCs. The receiver turns on a first subset of the multiple sub-ADCs during an idle listening period, and turns on a second subset of the multiple sub-ADCs upon detection of a completion of the first part of the two-part preamble, wherein the first subset of the multiple sub-ADCs is less than the second subset of the multiple sub-ADCs.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: January 29, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Shadi Abu-Surra, Eran Pisek
  • Patent number: 10075218
    Abstract: A method for user equipment (UE) in a wireless communication network.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: September 11, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Md. Saifur Rahman, Sridhar Rajagopal, Eko Onggosanusi, Thomas David Novlan, Aris Papasakellariou
  • Publication number: 20180254839
    Abstract: A method for a transceiver calibration and antenna array operation in a multi-input multi-output (MIMO) system. The method comprises sending a calibration signal and a pre-designed training sequence, via a coupling network, receiving a calibration signal and a pre-designed training sequence that is sent a the transceiver array in a time slotted pattern via a coupling network, generating an Rx calibration measurement (R1) based on one or more uplink signals received via antenna array and the coupling network, generating a Tx calibration measurement (T1) based on receipt of the calibration signal from each of antennas via the coupling network; and performing a joint Tx/Rx (TRx) calibration based on HR, R1, and T1, where H is a channel response in air interface, R is a channel response of receivers in transceiver array.
    Type: Application
    Filed: February 7, 2018
    Publication date: September 6, 2018
    Inventors: Jin Yuan, Yang Li, Gary Xu, Robert Monroe, Jianzhong Zhang, Sridhar Rajagopal
  • Publication number: 20180248787
    Abstract: There is provided a system that includes a local cloud radio access network (RAN), and a remote cloud RAN. The local cloud RAN processes latency-sensitive applications, and the remote cloud RAN processes latency-tolerant applications. User traffic is appropriately routed to the correct cloud RAN based on the application. User equipment (UE) has no knowledge of which network is being used for processing, i.e., this network processing split is done in a manner that is transparent to the UE, e.g., by dynamically selecting a different access point name for local vs. remote processing. The processing split of the RAN between the local cloud RAN and the remote cloud RAN is done in a dynamic manner depending on the number of devices requiring low latency support. This allows the local cloud RAN to be very compact and low-cost since it does not have to process the latency-tolerant traffic.
    Type: Application
    Filed: February 23, 2018
    Publication date: August 30, 2018
    Applicant: MAVENIR NETWORKS, INC.
    Inventors: Sridhar RAJAGOPAL, Pardeep KOHLI
  • Patent number: 10064217
    Abstract: A method of base station (BS) in a wireless communication system. the method comprises identifying a set of transmission parameters comprising a numerology, wherein the numerology includes a subcarrier spacing, determining a plurality of baseband signal generation chains each of which includes the set of transmission parameters comprising different numerology, and transmitting, at least one user equipment (UE), downlink signals comprising the set of transmission parameters using a multi-user multi-input multi-output (MU-MIMO).
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: August 28, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Jianzhong Zhang, Young-Han Nam
  • Patent number: 10056958
    Abstract: A method of providing multiple station beam refinement in a mmWave wireless network comprising an access point (AP) and a plurality of stations (STAs) is provided. The method includes providing an AP configured to selectively transmit wireless signals to a plurality of directional sectors and to selectively receive wireless signals from the plurality of directional sectors. The method further includes operating the AP to at least one of provide simultaneous transmit beam refinement for the plurality of STAs, provide simultaneous receive beam refinement for the plurality of STAs, receive simultaneous transmit beam refinement from the plurality of STAs, and receive simultaneous receive beam refinement from the plurality of STAs.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: August 21, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Rakesh Taori
  • Patent number: 10050816
    Abstract: A user equipment, apparatus, and method are provided for wireless communication with at least one base station. The user equipment includes a transceiver configured to communicate with the at least one base station by transmitting radio frequency signals to the at least one base station and by receiving radio frequency signals from the at least one base station. The user equipment also includes processing circuitry. The processing circuitry is configured to identify an occupied signal bandwidth of the radio frequency signals. The processing circuitry is also configured to identify a spectral mask for the occupied signal bandwidth. The processing circuitry is also configured to identify an unused available spectrum between the occupied signal bandwidth and the spectral mask. The processing circuitry is also configured to modulate a spectral mask filling (SMF) signal in the unused available spectrum, the SMF signal configured to reduce the peak-to-average power ratio of the radio frequency signals.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: August 14, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Shadi Abu-Surra
  • Patent number: 9838169
    Abstract: A user equipment, apparatus, and method are provided for wireless communication using an IG-OFDM structure. An apparatus is configured to transmit a known reference signal. The apparatus is configured to receive, in response to the reference signal and from at least one user equipment (UE), capability information that includes at least one of the sub-band bandwidth or number of independently decodable sub-bands that can be dynamically turned on or off by the at least one UE. The apparatus is configured to define an interleaved guard OFDM (IG-OFDM) structure according to the received capability information, the IG-OFDM structure including guard tones distributed within an OFDM symbol where there is no signal transmission on these guard tones. The apparatus is configured to communicate with the at least one UE using a transmitted waveform that is shaped according to the IG-OFDM structure.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: December 5, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Rakesh Taori, Sudhir Ramakrishna, Jaspreet Singh, Shadi Abu-Surra
  • Publication number: 20170289733
    Abstract: A user equipment (UE) and base station (BS) in a wireless communication network. The UE includes a receiver configured to receive at least one semi-persistent scheduling (SPS) configuration among a plurality of SPS configurations from a BS. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The UE also includes a transmitter configured to transmit the sidelink transmission in the different periodicity according to the at least one of the plurality of SPS configurations. The BS includes a controller configured to select at least one SPS configuration among a plurality of SPS configurations for a UE. Each of the SPS configurations configures the UE with a different periodicity of a sidelink transmission to be transmitted to another UE. The BS also includes a transmitter configured to transmit the selected at least one SPS configuration to the UE.
    Type: Application
    Filed: March 24, 2017
    Publication date: October 5, 2017
    Inventors: Sridhar Rajagopal, Aris Papasakellariou, Thomas David Novlan
  • Patent number: 9749935
    Abstract: A mobile station is configured to scan cells in a wireless network. The mobile station includes at least one antenna configured to transmit and receive wireless signals. The mobile station also includes a processor coupled to the at least one antenna, the processor configured to scan for one or more neighboring base station cells in a same frequency band as a serving base station cell using one or more receive beams. The one or more receive beams used for scanning are different than receive beams used for data communication with the serving base station cell.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: August 29, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ying Li, Zhouyue Pi, Sridhar Rajagopal, Pavan Nuggehalli, Shadi Abu-Surra, Sudhir Ramakrishna
  • Publication number: 20170208574
    Abstract: A relay node capable of supporting wireless backhaul communication includes a controller configured to identify a first timing of a backhaul downlink (DL) transmission and a second timing of an access uplink (UL) transmission to be substantially aligned, and a transceiver configured to receive at least one first symbol in the backhaul DL transmission from an base station (BS), and receive at least second symbol in an access UL transmission from a user equipment (UE). The controller is further configured to substantially align a third timing of a backhaul uplink (UL) transmission and a fourth timing of an access downlink (DL) transmission, wherein the transceiver is further configured to transmit at least third symbol in a backhaul uplink (UL) transmission to the BS, and transmit at least fourth symbol in the access DL transmission to the UE.
    Type: Application
    Filed: October 26, 2016
    Publication date: July 20, 2017
    Inventors: Sudhir Ramakrishna, Boon Loong Ng, Li Guo, Thomas David Novlan, Young-Han Nam, Sridhar Rajagopal, Jianzhong Zhang
  • Patent number: 9712187
    Abstract: A receiver, such as a mobile station or base station, includes a sliding window-decoder. An antenna in the receiver is configured to receive a protograph-based spatially coupled low density parity check (SC-LDPC) code from a transmitter. The sliding window-decoder is configured to perform a SC-LDPC decoding operation on the SC-LDPC code using a sliding window. The SC-LDPC code includes a parity check matrix. The sliding window includes a subset of protograph sections on which decoding calculations are iteratively performed. The sliding window-decoder performs a stopping rule configured to cease the decoding calculations as a function of a syndrome of one or more check nodes (CNs) in the sliding window.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: July 18, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Shadi Abu-Surra, Eran Pisek, Sridhar Rajagopal, Rakesh Taori
  • Publication number: 20170188391
    Abstract: The sensing method a first vehicle user equipment (UE) for collision avoidance in a wireless communication network comprises receiving a set of scheduling assignment (SA) information allocated to a set of second vehicle UEs, decoding the set of SA information, each of which includes SA information to each of the set of second vehicle UEs, performing energy sensing operation for resources to be used by each of the set of second vehicle UEs to determine additional potential SA transmission and data transmission from the set of second vehicle UEs over the resources, determining available resources for the data transmission from the first vehicle UE based on the performed energy sensing and SA sensing, skipping a channel sensing operation on at least one subframe that is used for the data transmission from the first vehicle UE, and transmitting data among resources identified as unused in next transmissions from second vehicle UEs.
    Type: Application
    Filed: December 16, 2016
    Publication date: June 29, 2017
    Inventors: Sridhar Rajagopal, Thomas David Novlan, Aris Papasakellariou
  • Patent number: RE47182
    Abstract: A visible light communication (VLC) device is provided for use in a VLC system. The VLC device detect a trigger condition indicating a failure of a VLC link associated with first allocated resources used to communicate with a second VLC device. In response to the detection, the VLC device terminates on the first allocated resources transmission of data to the second VLC device and transmits a fast link recovery (FLR) signal using the first allocated resources. The VLC device receives a fast link recovery response (FLR RSP) signal indicating the second VLC device received the FLR signal and, in response, the VLC device resumes transmission of data to the second VLC device.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: December 25, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ying Li, Sridhar Rajagopal