Patents by Inventor Venkatesh Ramireddy
Venkatesh Ramireddy 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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Publication number: 20240154672Abstract: A communication device for providing an explicit channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a radio time-variant frequency MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration, and downlink signals including the reference signal configuration, and a processor. The processor estimates the CSI using measurements on the downlink reference signals of the radio channel according to the reference signal configuration over one or more time instants/slots, constructs a frequency-domain channel tensor using the CSI estimate, performs a higher-order principal component analysis, HO-PCA, on the channel tensor, identifies a plurality of dominant principal components of the channel tensor, thereby obtaining a compressed channel tensor, and reports to the transmitter the explicit CSI including the dominant principal components of the channel tensor.Type: ApplicationFiled: December 18, 2023Publication date: May 9, 2024Inventors: Venkatesh RAMIREDDY, Markus LANDMANN, Marcus GROSSMANN, Florian RÖMER
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Patent number: 11973549Abstract: A receiver processes a radio signal received via a radio channel from a transmitter employing a plurality of antenna ports, determines complex precoder coefficients and delays of one or more space-delay precoders for one or more transmission layers and antenna ports at the transmitter so as to achieve a predefined property for a communication over the radio channel, and feeds back, explicitly or implicitly, delays and the complex precoder. The space-delay precoder has a dual-stage structure having a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, and a combining element per layer for complex scaling or combining one or more of the vectors selected from the spatial and/or frequency-domain codebook matrices. The frequency-domain codebook matrix is defined by a sub-matrix of a DFT matrix, which the sub-matrix of the DFT matrix is associated with a range of delay values.Type: GrantFiled: January 27, 2021Date of Patent: April 30, 2024Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.Inventors: Venkatesh Ramireddy, Markus Landmann, Marcus Großmann
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Publication number: 20240129011Abstract: The present disclosure relates to methods and apparatuses (UE, network node or gNB) for CSI reporting. The method performed by a UE comprises: receiving from the gNB, a radio signal via a MIMO channel, wherein the radio signal contains at least one DL-RS according to a DL-RS configuration; estimating said MIMO channel based on said received at least one DL reference signal for configured subbands; calculating a precoder matrix or a CSI matrix for a number of antenna ports of the gNB and configured subbands; the precoder matrix based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook; and reporting, to the gNB, a CSI feedback report and/or a PMI/RI, used to indicate the precoder matrix or the CSI matrix for the configured antenna ports and subbands.Type: ApplicationFiled: December 4, 2023Publication date: April 18, 2024Applicant: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V.Inventors: VENKATESH RAMIREDDY, Marcus Grossmann, Markus Landmann
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Patent number: 11901996Abstract: The present disclosure relates to methods and apparatuses (UE, network node or gNB) for CSI reporting. The method performed by a UE comprises: receiving from the gNB, a radio signal via a MIMO channel, wherein the radio signal contains at least one DL-RS according to a DL-RS configuration; estimating said MIMO channel based on said received at least one DL reference signal for configured subbands; calculating a precoder matrix or a CSI matrix for a number of antenna ports of the gNB and configured subbands; the precoder matrix based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook; and reporting, to the gNB, a CSI feedback report and/or a PMI/RI, used to indicate the precoder matrix or the CSI matrix for the configured antenna ports and subbands.Type: GrantFiled: April 14, 2020Date of Patent: February 13, 2024Inventors: Venkatesh Ramireddy, Marcus Grossmann, Markus Landmann
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Patent number: 11876589Abstract: A communication device for providing an explicit channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a radio time-variant frequency MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration, and downlink signals including the reference signal configuration, and a processor. The processor estimates the CSI using measurements on the downlink reference signals of the radio channel according to the reference signal configuration over one or more time instants/slots, constructs a frequency-domain channel tensor using the CSI estimate, performs a higher-order principal component analysis, HO-PCA, on the channel tensor, identifies a plurality of dominant principal components of the channel tensor, thereby obtaining a compressed channel tensor, and reports to the transmitter the explicit CSI including the dominant principal components of the channel tensor.Type: GrantFiled: November 17, 2020Date of Patent: January 16, 2024Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.Inventors: Venkatesh Ramireddy, Markus Landmann, Marcus Grossmann, Florian Römer
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Publication number: 20230421220Abstract: A method performed by a UE for generating a CSI report in a wireless communication system, including receiving from a network node, a CSI report configuration information including at least one parameter, D, for indicating a first basis set of D basis vectors used for constructing for each transmission layer a precoding vector or matrix for a rank set; identifying a precoding vector matrix for each transmission layer based on the first basis set, a second basis set comprising P basis vectors, and a number of combining coefficients for combining selected vectors from the first and second basis sets; generating a CSI report based on the CSI report configuration information for a RI, or v of the rank set; and transmitting the CSI report to the network node.Type: ApplicationFiled: November 23, 2021Publication date: December 28, 2023Applicant: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.Inventors: Marcus Grossmann, Venkatesh Ramireddy
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Publication number: 20230208494Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.Type: ApplicationFiled: February 21, 2023Publication date: June 29, 2023Inventors: Marcus GROßMANN, Venkatesh RAMIREDDY, Markus LANDMANN, Sutharshun VARATHARAAJAN
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Publication number: 20230198713Abstract: A user device, UE, for a wireless communication network is configured or preconfigured with one or more Sounding Reference Signal, SRS, resources to be used for SRS transmissions. The one or more SRS resources include a plurality of frequency domain resources. Responsive to receiving an indication of a subset of SRS frequency domain resources for each resource, the UE performs an SRS transmission using the indicated subset of frequency domain resources.Type: ApplicationFiled: December 23, 2022Publication date: June 22, 2023Inventors: Marcus GROSSMANN, Venkatesh RAMIREDDY
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Patent number: 11616551Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.Type: GrantFiled: November 16, 2020Date of Patent: March 28, 2023Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Marcus Großmann, Venkatesh Ramireddy, Markus Landmann, Sutharshun Varatharaajan
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Patent number: 11595089Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive a radio signal including downlink reference signals. The processor estimates an explicit CSI, selects a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, calculates and reports to the transmitter a CSI feedback. The communication device selects from one or more codebooks a subset of D delay components and/or a subset of F Doppler-frequency components and uses the selected subset of delay components for each polarization and each spatial beam and/or the selected subset of Doppler-frequency components for each polarization, each spatial beam and each delay, when calculating the Doppler-delay precoder matrix.Type: GrantFiled: September 7, 2021Date of Patent: February 28, 2023Inventors: Venkatesh Ramireddy, Marcus Grobmann, Markus Landmann
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Patent number: 11552682Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive a radio signal including downlink reference signals. The processor estimates an explicit CSI, selects a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, calculates and reports to the transmitter a CSI feedback. The communication device selects from one or more codebooks a subset of D delay components and/or a subset of F Doppler-frequency components and uses the selected subset of delay components for each polarization and each spatial beam and/or the selected subset of Doppler-frequency components for each polarization, each spatial beam and each delay, when calculating the Doppler-delay precoder matrix.Type: GrantFiled: September 7, 2021Date of Patent: January 10, 2023Inventors: Venkatesh Ramireddy, Marcus Grobmann, Markus Landmann
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Patent number: 11539409Abstract: A receiver includes an antenna for a wireless communication with a transmitter and a signal processor to process a radio signal received via a radio channel. The receiver constructs a codebook including sets of beamforming weights for a plurality of directions. The beamforming weights are based on a first antenna array response matrix of a transmitter antenna array. The transmitter selects beamforming weights from the codebook to form a transmit/receive beam pointing in a selected direction. The receiver calculates one or more characteristic matrices based on a model of the transmitter antenna array, and constructs the codebook using a second antenna array response matrix and the one or more calculated characteristic matrices.Type: GrantFiled: December 22, 2020Date of Patent: December 27, 2022Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.Inventors: Venkatesh Ramireddy, Markus Landmann, Marcus Großmann
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Publication number: 20220385344Abstract: A method for providing feedback about a MIMO channel between a transmitter and a receiver in a wireless communication system includes receiving a radio signal which includes one or more reference signals according to at least one reference signal configuration known at the receiver and indicating one or more antenna ports associated with the reference signals; estimating the MIMO channel based on measurements on the reference signals; determining a precoding vector or matrix based on the estimated MIMO channel, on one or more vectors or one or more combinations of vectors from at least one port-selection codebook and on a set of precoding coefficients, the port-selection codebook including vectors, each vector being associated with one of the antenna ports and having a single element which is one and the remaining elements being zeros; and reporting, a feedback to the transmitter which indicates the determined precoding vector or matrix.Type: ApplicationFiled: July 20, 2022Publication date: December 1, 2022Inventors: Marcus GROßMANN, Venkatesh RAMIREDDY, Markus LANDMANN
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Publication number: 20220224391Abstract: The present disclosure relates to methods and apparatuses (UE, network node or gNB) for CSI reporting. The method performed by a UE comprises: receiving from the gNB, a radio signal via a MIMO channel, wherein the radio signal contains at least one DL-RS according to a DL-RS configuration; estimating said MIMO channel based on said received at least one DL reference signal for configured subbands; calculating a precoder matrix or a CSI matrix for a number of antenna ports of the gNB and configured subbands; the precoder matrix bcing based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook; and reporting to the gNB, a CSI feedback report and/or a PMI/RI, used to indicate the precoder matrix or the CSI matrix for the configured antenna ports and subbands.Type: ApplicationFiled: April 14, 2020Publication date: July 14, 2022Applicant: Fraunhofer-Gesellschaft zur Föderung der angewanten Forschung e.V.Inventors: Venkatesh Ramireddy, Marcus Grossmann, Markus Landmann
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Publication number: 20220224390Abstract: The present disclosure relates to methods and apparatuses (UE, network node or gNB) for CSI reporting. The method performed by a UE comprises: receiving from the gNB, a radio signal via a MIMO channel, wherein the radio signal contains at least one DL-RS according to a DL-RS configuration; estimating said MIMO channel based on said received at least one DL reference signal for configured subbands; calculating a precoder matrix or a CSI matrix for a number of antenna ports of the gNB and configured subbands; the precoder matrix based on a first codebook and on a second codebook and a set of combining coefficients for complex scaling/combining one or more of vectors selected from the first codebook and the second codebook; and reporting, to the gNB, a CSI feedback report and/or a PMI/RI, used to indicate the precoder matrix or the CSI matrix for the configured antenna ports and subbands.Type: ApplicationFiled: April 14, 2020Publication date: July 14, 2022Applicant: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.Inventors: Venkatesh Ramireddy, Marcus Grossmann, Markus Landmann
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Publication number: 20220029676Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive a radio signal including downlink reference signals. The processor estimates an explicit CSI, selects a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, calculates and reports to the transmitter a CSI feedback. The communication device selects from one or more codebooks a subset of D delay components and/or a subset of F Doppler-frequency components and uses the selected subset of delay components for each polarization and each spatial beam and/or the selected subset of Doppler-frequency components for each polarization, each spatial beam and each delay, when calculating the Doppler-delay precoder matrix.Type: ApplicationFiled: September 7, 2021Publication date: January 27, 2022Inventors: Venkatesh RAMIREDDY, Marcus GROßMANN, Markus LANDMANN
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Publication number: 20210226674Abstract: A communication device providing CSI feedback in a wireless communication system includes a transceiver to receive downlink reference signals and downlink signals including a reference signal configuration. A processor estimates an explicit CSI in the frequency domain. The processor selects a Doppler-delay-beam precoder matrix for a composite Doppler-delay-beam three-stage precoder, which is based on one or more codebooks including one or more transmit-side spatial beam components, one or more delay components, and one or more Doppler-frequency components, The processor calculates a CQI and/or a PMI and/or a rank indicator, RI, using the explicit CSI and the composite Doppler-delay-beam three-stage precoder, and reports the CSI feedback including the CQI, and/or the PMI and/or the RI. The one or more delay and/or Doppler-frequency components are defined by one or more sub-matrices of a DFT matrix or an oversampled DFT matrix.Type: ApplicationFiled: March 10, 2021Publication date: July 22, 2021Inventors: Venkatesh RAMIREDDY, Markus LANDMANN, Marcus GROßMANN, Sutharshun VARATHARAAJAN
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Publication number: 20210167825Abstract: A receiver processes a radio signal received via a radio channel from a transmitter employing a plurality of antenna ports, determines complex precoder coefficients and delays of one or more space-delay precoders for one or more transmission layers and antenna ports at the transmitter so as to achieve a predefined property for a communication over the radio channel, and feeds back, explicitly or implicitly, delays and the complex precoder. The space-delay precoder has a dual-stage structure having a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, and a combining element per layer for complex scaling or combining one or more of the vectors selected from the spatial and/or frequency-domain codebook matrices. The frequency-domain codebook matrix is defined by a sub-matrix of a DFT matrix, which the sub-matrix of the DFT matrix is associated with a range of delay values.Type: ApplicationFiled: January 27, 2021Publication date: June 3, 2021Inventors: Venkatesh RAMIREDDY, Markus LANDMANN, Marcus GROßMANN
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Publication number: 20210143885Abstract: A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the RI.Type: ApplicationFiled: November 16, 2020Publication date: May 13, 2021Inventors: Marcus GROßMANN, Venkatesh RAMIREDDY, Markus LANDMANN, Sutharshun VARATHARAAJAN
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Publication number: 20210111771Abstract: A receiver includes an antenna for a wireless communication with a transmitter and a signal processor to process a radio signal received a radio channel. The receiver constructs a codebook including sets of beamforming weights for a plurality of directions. The beamforming weights are based on a first antenna array response matrix of a transmitter antenna array. The transmitter selects beamforming weights from the codebook to form a transmit/receive beam pointing in a selected direction. The receiver calculates one or more characteristic matrices based on a model of the transmitter antenna array, and constructs the codebook using a second antenna array response matrix and the one or more calculated characteristic matrices.Type: ApplicationFiled: December 22, 2020Publication date: April 15, 2021Inventors: Venkatesh RAMIREDDY, Markus LANDMANN, Marcus GROßMANN