Patents by Inventor Abhishek Kumar Agrawal

Abhishek Kumar Agrawal 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: 20210143872
    Abstract: A multiple-input multiple-output (MIMO) wireless transceiver with “N” transmit and receive chains and a bandwidth evaluation circuit, a chain partitioning circuit and a switchable radio frequency ‘RF’ filter bank. The bandwidth evaluation circuit evaluates both the utilization of the WLAN(s) and any remaining communications channels and determines whether to operate the MIMO chains synchronously as a single radio or asynchronously as multiple radios. The chain partitioning circuit either partitions subsets of the MIMO chains for asynchronous operation as distinct radios or combines all MIMO chains for synchronous operation as a single radio. The switchable RF filter bank is responsive to a partitioning of subsets of the chains into distinct radios to add RF filters to a RF portion of the chains to isolate each radio from one another, and responsive to a combining of all MIMO chains into a single radio to remove all RF filters.
    Type: Application
    Filed: December 18, 2020
    Publication date: May 13, 2021
    Inventors: Simon DUXBURY, Abhishek Kumar AGRAWAL, Saied ANSARI, Didier MARGAIRAZ, Hongping LIU
  • Publication number: 20210144695
    Abstract: Methods and systems may include processes by which the reliability and robustness of a wireless network may be improved. In some implementations, a method may include selecting at least two resource units to be used for communications to a single client device; and transmitting data in duplicate via each of the at least two resource units to the client device such that the client device is able to combine the data from each of the at least two resource units into a single instance of the data. In some implementations, a method may include obtaining notification of one or more ranges of frequencies corresponding to a set of resource units to be avoided in a spectrum of available frequencies, and allocating resource units to a set of client devices that covers the available frequencies while excluding the set of resource units to be avoided.
    Type: Application
    Filed: September 30, 2020
    Publication date: May 13, 2021
    Inventors: Abhishek Kumar Agrawal, Imran Latif, Sigurd Schelstraete, Hossein Dehghan
  • Patent number: 10911162
    Abstract: A MIMO transceiver may include a communication chain configured to generate a signal at a first frequency. The communication chain may include a pre-distorter configured to accept pre-distortion parameters to pre-distort signals. The communication chain may include a PA to amplify the signals. The MIMO transceiver may include a DPD chain configured to receive the signal at the first frequency. The DPD chain may include a data converter to sample the signal using a sampling rate based on a baseband frequency. The data converter may be configured to generate a sample signal based on the sampling of the signal. The DPD chain may include a buffer configured to buffer the sample signal. The MIMO transceiver may include a DPD circuit configured to calibrate the pre-distortion parameters calibrated based on the buffered sample signal to compensate for non-linearity in amplification provided by the PA of the communication chain.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: February 2, 2021
    Inventors: Abhishek Kumar Agrawal, Hossein Dehghan
  • Patent number: 10560140
    Abstract: A MIMO wireless transceiver includes: antennas, components forming transmit and receive chains coupled to the antennas, a signal combiner, and a predistortion calibration circuit. The transmit chain components include: pre-distorter circuits and power amplifiers (PA)s, The pre-distorter circuits each couple to a transmit chain for pre-distorting an associated signal thereon. The PAs are input coupled to a corresponding transmit chain and output coupled to a corresponding antenna. The signal combiner combines the amplified signals from all of the PAs into a combined output signal.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: February 11, 2020
    Inventors: Songping Wu, Hossein Dehghan, Abhishek Kumar Agrawal
  • Publication number: 20150092825
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus correlates the feedback signal to a reference transmit signal to correct time misalignments between the transmit chain and the feedback loop, wherein the reference transmit signal is generated in digital domain at an input to a transmit chain and estimates a transmit signal quality value based on the correlation.
    Type: Application
    Filed: June 12, 2014
    Publication date: April 2, 2015
    Inventors: Li GAO, Abhishek Kumar AGRAWAL, Douglas GROVER, Chalin Chac LEE, Jarir Muhammad FADLULLAH, Dongbo ZHANG, Rema VAIDYANATHAN
  • Publication number: 20140233621
    Abstract: A method and apparatus for characterized pre-distortion calibration is provided. The method begins with the selection of a number of devices to be characterized. The number of devices selected may be a subset of a larger group of devices. The selected number of devices is then characterized. The method avoids characterizing the large group of devices. The apparatus includes a processor for performing pre-distortion calibration, a processor for averaging curves for each RF gain index on each channel, and a non-volatile memory.
    Type: Application
    Filed: September 27, 2013
    Publication date: August 21, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Sudarsan KRISHNAN, Andre V. IZOTOV, Michael R. HUGHES, Abhishek Kumar AGRAWAL, Satheesha B. RANGEGOWDA
  • Publication number: 20030090530
    Abstract: One embodiment of the present invention provides a computer-implemented method for collaborative shape design in a web-based system having a client and a server. In this embodiment, the method includes obtaining shape information of a shape on the client via a user interface, sending the shape information from the client to the server, generating a three-dimensional (3D) representation of the shape on the server using the shape information, sending the 3D representation of the shape to the client, and displaying the 3D representation of the shape on the client. In one embodiment, the method further includes modifying the 3D representation of the shape on the client, and sending the modified 3D representation of the shape to the server.
    Type: Application
    Filed: September 6, 2002
    Publication date: May 15, 2003
    Inventors: Karthik Ramani, Abhishek Kumar Agrawal