Patents by Inventor Thushara Hewavithana

Thushara Hewavithana 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: 20220173923
    Abstract: An active cable node circuit associated with a hybrid fiber coax network is disclosed. The active cable node circuit comprises an uplink transceiver circuit configured to couple to an aggregation node circuit over a first coax cable link comprising coaxial cables and receive a set of downstream data signals from the aggregation node circuit. In some embodiments, the active cable node circuit further comprises one or more access transceiver circuits configured to provide the set of downstream data signals received at the uplink transceiver circuit or a processed version thereof, to one or more access circuits. In some embodiments, each of the one or more access transceiver circuits is configured to couple to the uplink transceiver circuit at a first end, and couple to a set of access circuits of the one or more access circuits at a second, different end, over a second coax cable link.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 2, 2022
    Inventors: Rainer Strobel, Thushara Hewavithana
  • Publication number: 20220158870
    Abstract: Various strategies and devices for same are disclosed to correct for/mitigate frequency offset (such as due to differing accuracies between an oscillator of a transmitting device and an oscillator of a receiving device) and Doppler shift (such as due to a changing relative position between a receiving device and a transmitting device). These strategies may be employed in a MIMO setting, such as, e.g. a stationary base station and a plurality of terminal devices (e.g. user devices, mobile stations, etc.), in which the transmissions for each terminal device may be associated with a different frequency offset and a different Doppler shift.
    Type: Application
    Filed: December 16, 2020
    Publication date: May 19, 2022
    Inventors: Thushara HEWAVITHANA, Yuwen LIU, Xuebin YANG, Chenxi YUE, Yuzhou ZHANG
  • Publication number: 20220149891
    Abstract: A node circuit associated with a hybrid fiber coax (HFC) network is disclosed. The node circuit includes an optimizer circuit configured to process a plurality of signal-to-noise ratio (SNR) values associated with a plurality of subcarriers, respectively, associated with a set of cable modem (CM) circuits coupled to the node circuit. In some embodiments, the plurality of subcarriers comprises subcarriers that are allocated to the set of CM circuits for communication with the node circuit. In some embodiments, the optimizer circuit is further configured to determine an optimal transmit power of the node circuit, based on the plurality of SNR values and a distortion model of a transmitter circuit associated with the node circuit. In some embodiments, the distortion model defines a transmitter distortion associated with the transmitter circuit.
    Type: Application
    Filed: February 26, 2020
    Publication date: May 12, 2022
    Inventors: Rainer Strobel, Thushara Hewavithana
  • Publication number: 20220052880
    Abstract: This disclosure relates to apparatuses, systems, and methods for channel estimation, and in particular channel estimation for 5G New Radio systems. The channel estimation interpolates, prior to performing a de-spreading operation, a first combined channel estimation and a second combined channel estimation to provide from the first combined channel estimation one or more channel estimation values at indices associated with the second combined channel estimation and/or to provide from the second combined channel estimation one or more channel estimation values at indices associated with the first combined channel estimation.
    Type: Application
    Filed: June 22, 2021
    Publication date: February 17, 2022
    Inventors: Thushara HEWAVITHANA, Yuzhou ZHANG, Xuebin YANG
  • Publication number: 20220021475
    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.
    Type: Application
    Filed: July 23, 2021
    Publication date: January 20, 2022
    Applicant: Intel Corporation
    Inventors: Bernard Arambepola, Noam Tal, Sahan S. Gamage, Thushara Hewavithana, Shaul Shulman
  • Patent number: 11133915
    Abstract: A cable modem supporting full duplex (FDX) operations. The cable modem includes a transmit circuitry configured to process a transmit signal and a receive circuitry configured to process a receive signal. The receive circuitry includes a switchable analog filter configured to filter the receive signal. The switchable analog filter is configurable for different passband frequencies. The receive circuitry also includes a digital compensation filter configured to compensate a difference in frequency response in a specific frequency band due to switching of the switchable analog filter for a different passband frequency. The cable modem also includes an adjacent channel interference (ACI) cancellation filter and an adjacent leakage interference (ALI) cancellation filter. A digital compensation filter is also used in processing the ACI cancellation signal and the ALI cancellation signal to impose or compensate the difference in frequency response due to the switchable analog filter switching.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: September 28, 2021
    Assignee: MaxLinear, Inc.
    Inventors: Boaz Kol, Noam Tal, Shaul Shulman, Thushara Hewavithana
  • Patent number: 11075713
    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: July 27, 2021
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Noam Tal, Sahan S. Gamage, Thushara Hewavithana, Shaul Shulman
  • Publication number: 20210227205
    Abstract: A method and apparatus for controlling a gain of an amplifier of a cable modem operating in a full duplex (FDX) mode. A cable modem includes an amplifier configured to amplify a received signal, a power meter configured to measure a power of the received signal on a plurality of channels, and a control unit configured to estimate a maximum expected power to receive on the plurality of channels based on the measured power and set a gain of the amplifier based on the maximum expected power. The cable modem is configured to operate in a full duplex mode. The channels include a full duplex upstream channel, a full duplex downstream channel, and a legacy downstream channel. The maximum expected power may be estimated via a sounding procedure. A power spectral density may be measured and the maximum expected power may be derived from the power spectral density.
    Type: Application
    Filed: May 6, 2019
    Publication date: July 22, 2021
    Inventors: Walter BSCHOR, Thushara HEWAVITHANA, Boaz KOL
  • Publication number: 20210184900
    Abstract: Symbols are received on a downstream channel. A value of a channel synchronization parameter is determined based on the received symbols. An interference event on the downstream channel is detected. In response to detecting the interference event: an output signal is determined based on at least one cached value of the channel synchronization parameter, the at least one cached value being determined based on symbols received prior to and offset from said detecting of the interference event.
    Type: Application
    Filed: March 30, 2020
    Publication date: June 17, 2021
    Inventors: Bernard Arambepola, Thushara Hewavithana
  • Publication number: 20210116531
    Abstract: For example, a radar processor may be configured to determine a first 1D AoA spectrum corresponding to a first dimension of an Azimuth-Elevation domain based on radar Rx data, to determine a second 1D AoA spectrum corresponding to a second dimension of the Azimuth-Elevation domain based on the radar Rx data, to detect one or more first object hypotheses in the first dimension based on the first 1D AoA spectrum, to detect one or more second object hypotheses in the second dimension based on the second 1D AoA spectrum, to determine a plurality of 2D object hypotheses corresponding to the Azimuth-Elevation domain based on the first object hypotheses and the second object hypotheses, and to generate 2D AoA information based on a 2D AoA spectrum analysis of the radar Rx data according to the plurality of 2D object hypotheses.
    Type: Application
    Filed: December 24, 2020
    Publication date: April 22, 2021
    Applicant: Intel Corporation
    Inventors: Ophir Shabtay, Joseph Tabrikian, Thushara Hewavithana
  • Patent number: 10848267
    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: November 24, 2020
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Noam Tal, Sahan S. Gamage, Thushara Hewavithana, Shaul Shulman
  • Patent number: 10826635
    Abstract: Synchronizing methods and architectures for cable modems to transmit and receive Full Duplex (FDX) resource block allocations (RBAs) using filter switching and coordinated updating of equalization coefficients. A cable modem including a block of switchable filters, an analog front end (AFE) and a PHY/MAC System on a Chip (SoC) tuner to, at least in part, provide signals to switch the switchable filters in accordance with the RBA changes and synchronize updating tuner equalizations to match filter switching in a coordinated manner by marking received data at the AFE.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: November 3, 2020
    Assignee: MaxLinear, Inc.
    Inventors: Nathan Goichberg, Shaul Shulman, Thushara Hewavithana
  • Patent number: 10742264
    Abstract: A cable modem system for discovering interference groups (IGs) includes an infrastructure and a cable modem termination system (CMTS). The infrastructure is for transferring data. The CMTS is configured to initiate generation of test signals by a set of cable modems (CMs), obtain a set of test measurements for the set of CMs, discover interference groups (IGs) of the set of CMs based on the obtained set of test measurements and assign a plurality of upstream and downstream channels for the set of CMs that use orthogonal frequency division multiplexing (OFDM) based on the discovered IGs.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: August 11, 2020
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Thushara Hewavithana, Noam Tal, Shaul Shulman
  • Publication number: 20200244505
    Abstract: A modem circuit associated with a communication system is disclosed. The modem circuit comprises a symbol tracking circuit configured to track a symbol timing associated with a downstream (DS) channel associated with the modem circuit, in accordance with a timing offset estimate. In some embodiments, the timing offset estimate comprises a unified timing offset derived based on one or more external channels associated with the modem circuit that is different from the DS channel. The symbol tracking circuit is further configured to apply a sample rate correction to a DS signal associated with the DS channel, based on the timing offset estimate comprising the unified timing offset, and apply a frequency correction to the DS signal, based on a frequency offset estimate comprising a unified frequency offset derived based on the one or more external channels.
    Type: Application
    Filed: January 28, 2020
    Publication date: July 30, 2020
    Inventors: Thushara Hewavithana, Noam Tal, Boaz Kol, Murti Devarakonda
  • Publication number: 20200228162
    Abstract: A cable modem system for discovering interference groups (IGs) includes an infrastructure and a cable modem termination system (CMTS). The infrastructure is for transferring data. The CMTS is configured to initiate generation of test signals by a set of cable modems (CMs), obtain a set of test measurements for the set of CMs, discover interference groups (IGs) of the set of CMs based on the obtained set of test measurements and assign a plurality of upstream and downstream channels for the set of CMs that use orthogonal frequency division multiplexing (OFDM) based on the discovered IGs.
    Type: Application
    Filed: March 30, 2020
    Publication date: July 16, 2020
    Inventors: Bernard Arambepola, Thushara Hewavithana, Noam Tal, Shaul Shulman
  • Publication number: 20200162230
    Abstract: A cable modem supporting full duplex (FDX) operations. The cable modem includes a transmit circuitry configured to process a transmit signal and a receive circuitry configured to process a receive signal. The receive circuitry includes a switchable analog filter configured to filter the receive signal. The switchable analog filter is configurable for different passband frequencies. The receive circuitry also includes a digital compensation filter configured to compensate a difference in frequency response in a specific frequency band due to switching of the switchable analog filter for a different passband frequency. The cable modem also includes an adjacent channel interference (ACI) cancellation filter and an adjacent leakage interference (ALI) cancellation filter. A digital compensation filter is also used in processing the ACI cancellation signal and the ALI cancellation signal to impose or compensate the difference in frequency response due to the switchable analog filter switching.
    Type: Application
    Filed: October 15, 2019
    Publication date: May 21, 2020
    Applicant: Intel Corporation
    Inventors: Boaz Kol, Noam Tal, Shaul Shulman, Thushara Hewavithana
  • Patent number: 10652055
    Abstract: Symbols are received on a downstream channel. A value of a channel synchronization parameter is determined based on the received symbols. An interference event on the downstream channel is detected. In response to detecting the interference event: an output signal is determined based on at least one cached value of the channel synchronization parameter, the at least one cached value being determined based on symbols received prior to and offset from the detecting of the interference event.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: May 12, 2020
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Thushara Hewavithana
  • Publication number: 20200119834
    Abstract: Mixed mode constellation mapping to map a data block to a block of sub-carriers based on a configurable set of one or more constellation mapping schemes, and corresponding mixed mode least likelihood ratio (LLR) de-mapping based on the configurable set of one or more modulation schemes. The set may be configurable to include multiple modulation schemes to provide to a SEvSNR measure that is a non-weighted or weighted average of SEvSNR measures of the multiple modulation schemes. Mixed mode constellation mapping may be useful be configurable to control spectral efficiency versus SNR (SEvSNR) over a range of SNR with relatively fine SNR granularity, and may be configurable to control SEvSNR over a range of SNR at a fixed FEC code rate, which may include a highest available or highest permitted code rate.
    Type: Application
    Filed: December 13, 2019
    Publication date: April 16, 2020
    Applicant: Intel Corporation
    Inventors: Bernard Arambepola, Noam Tal, Sahan S. Gamage, Thushara Hewavithana, Shaul Shulman
  • Publication number: 20200021380
    Abstract: Synchronizing methods and architectures for cable modems to transmit and receive Full Duplex (FDX) resource block allocations (RBAs) using filter switching and coordinated updating of equalization coefficients. A cable modem including a block of switchable filters, an analog front end (AFE) and a PHY/MAC System on a Chip (SoC) tuner to, at least in part, provide signals to switch the switchable filters in accordance with the RBA changes and synchronize updating tuner equalizations to match filter switching in a coordinated manner by marking received data at the AFE.
    Type: Application
    Filed: February 13, 2019
    Publication date: January 16, 2020
    Inventors: Nathan Goichberg, Shaul Shulman, Thushara Hewavithana
  • Patent number: 10491249
    Abstract: A method and apparatus for cancelling self-interference in a cable network implementing full duplex (FDX). A processor in a cable modem may obtain a frequency response of an echo channel for at least one sub-channel in an FDX band and calculate filter coefficients based on the frequency response, and an interference canceller cancels the self-interference in the downstream signal. The interference canceller includes filters in a digital domain to generate an interference cancellation signal from a reference signal. In another example, the processor may obtain frequency responses of an echo channel for all sub-channels in a FDX band, combine the frequency responses for the FDX band, and generate a channel impulse response for the FDX band from the combined frequency response. The interference canceller may then cancel the self-interference in the downstream signal in an analog domain based on the channel impulse response.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: November 26, 2019
    Assignee: Intel Corporation
    Inventors: Thushara Hewavithana, Shaul Shulman, Noam Tal, Boaz Kol, Nathan Goichberg, David Barr