Patents by Inventor Aditya Dua

Aditya Dua 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: 8873685
    Abstract: An apparatus and method for mitigation of receive power imbalance including estimating input power levels on two diversity receive branches in a receiver; computing a power imbalance between the two diversity receive branches and determining a weaker receive branch; setting a weakRX parameter based on the weaker receive branch; computing an intercept parameter c0 for a switching curve based on the weakRX parameter; computing a threshold T based on the intercept parameter; and determining a switching decision for the receiver based on the threshold T.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: October 28, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Aditya Dua, Feng Lu
  • Patent number: 8855183
    Abstract: A method of wireless communication with improved performance employs an equalizer receiver with multiple receive antennas. Equalizer taps for linear filters of the equalizer receiver are generated by determining a conditioned covariance matrix of a first data path and a second data path based on a first gain (g0) of this first data path and a second gain (g1) of the second data path. The equalizer taps of the first data path and the second data path are determined based on the conditioned covariance matrix. The first data path and the second data path are then equalized using the equalizer taps. An equalized signal is generated by combining the equalized first data path with the equalized second data path.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: October 7, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Aditya Dua, Lei Xiao, Je Woo Kim, Feng Lu
  • Patent number: 8837649
    Abstract: Methods and apparatus are described for processing a signal in a communication system. A signal may be received a user equipment, and a pilot transmission from a non-primary transmit antenna of a cell in the communication system may be detected in the signal based on metrics associated with a pilot channel. Information about the pilot channel is not signaled to the user equipment. The detected pilot transmission is used to improve receiver processing of the signal.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: September 16, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Amir Farajidana, Aditya Dua, Abhinav Gupta, Subramanya Padubidri Nanyam Rao
  • Publication number: 20140192853
    Abstract: One or more aspects of the disclosure provide an efficient equalization scheme capable of mitigating multi-path interference on channels with large delay spread using short-length equalizers. That is, by dividing stored samples of a signal received on the multi-path channel by time into a plurality of clusters, a short-length equalizer can be utilized in an iterative fashion on each of the clusters, thus eliminating the need for a large length equalizer while still providing improved performance over that of a Rake receiver at large delay spreads. Other aspects, embodiments, and features are also claimed and described.
    Type: Application
    Filed: January 10, 2013
    Publication date: July 10, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Chun-Hao Hsu, Aditya Dua, Nathan Dingsai Yee, Abhinav Gupta
  • Patent number: 8761322
    Abstract: The present disclosure presents methods and apparatuses for enhanced received signal processing using signal-based channel impulse response (CIR) estimation. For example, according to an example method presented herein, a user equipment (UE) or a component therein may receive a signal corresponding to a transmitted signal sent by a network entity, wherein the transmitted signal comprises at least a data channel, estimate chip contents of the transmitted signal, based on the received signal including the data channel, to obtain estimated chip contents, and compute an estimated channel impulse response (CIR) based on at least the estimated chip contents. Based on this estimated CIR, the UE may thereafter reprogram a received signal reconstruction filter, perform interference cancellation procedures, and/or adjust one or more equalizer taps. By performing such functions, the UE may exhibit improved communication characteristics and enable a more robust user experience.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: June 24, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Manish Jain, Aditya Dua, Manini Shah, Keith Saints, Farrokh Abrishamkar
  • Publication number: 20140093021
    Abstract: The present disclosure presents methods and apparatuses for enhanced received signal processing using signal-based channel impulse response (CIR) estimation. For example, according to an example method presented herein, a user equipment (UE) or a component therein may receive a signal corresponding to a transmitted signal sent by a network entity, wherein the transmitted signal comprises at least a data channel, estimate chip contents of the transmitted signal, based on the received signal including the data channel, to obtain estimated chip contents, and compute an estimated channel impulse response (CIR) based on at least the estimated chip contents. Based on this estimated CIR, the UE may thereafter reprogram a received signal reconstruction filter, perform interference cancelation procedures, and/or adjust one or more equalizer taps. By performing such functions, the UE may exhibit improved communication characteristics and enable a more robust user experience.
    Type: Application
    Filed: October 2, 2012
    Publication date: April 3, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Manish JAIN, Aditya Dua, Manini Shah, Keith Saints, Farrokh Abrishamkar
  • Publication number: 20140016689
    Abstract: Disclosed are methods and apparatus for initializing an equalizer in a diversity receiver. In one aspect, the initialization includes estimating a channel impulse response (CIR) for each receiver chain of the diversity receiver; determining noise power estimates for each receiver chain based on the CIRs; and adaptively adjusting equalizer taps of each receiver chain based on the noise power estimates. In one aspect, the adaptive adjusting of the equalizer taps is based on scaling the CIR and covariance metrics for the receiver chain with higher noise power by a scale factor determined from the noise power estimates. In another aspect, the adaptive adjusting of the equalizer taps is based adaptive conditioning on the diagonal of the covariance matrix.
    Type: Application
    Filed: February 1, 2013
    Publication date: January 16, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Aditya DUA, Nate Chizgi
  • Publication number: 20140016677
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in connection with dynamic selection of a UE receiver. In one example, a communications device is equipped to obtain one or more channel impulse response (CIR) estimates, generate a delay spread metric value that characterizes a multipath delay spread of a channel based on the obtained one or more CIR estimates, and select a receiver option with a first power consumption value, for use by the UE, from a plurality receiver options with different optimal power consumption values, based on the generated delay spread metric value. In an aspect, a comparatively more complex receiver option may be selected when the channel is rich in multipath. In another aspect, a comparatively less complex receiver option may be selected when the channel exhibits flat fading.
    Type: Application
    Filed: March 12, 2013
    Publication date: January 16, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Aditya Dua, Lei Xiao
  • Publication number: 20130343497
    Abstract: Methods and apparatus are described for processing a signal in a communication system. A signal may be received a user equipment, and a pilot transmission from a non-primary transmit antenna of a cell in the communication system may be detected in the signal based on metrics associated with a pilot channel. Information about the pilot channel is not signaled to the user equipment. The detected pilot transmission is used to improve receiver processing of the signal.
    Type: Application
    Filed: June 26, 2012
    Publication date: December 26, 2013
    Applicant: QUALCOMM Incorporated
    Inventors: Amir Farajidana, Aditya Dua, Abhinav Gupta, Subramanya Padubidri Nanyam Rao
  • Patent number: 8554151
    Abstract: Methods and apparatuses for data aided channel quality estimation using both pilot and data information are disclosed herein. In one exemplary aspect, a method for estimating channel quality in a wireless communication system is disclosed. The method comprises estimating a pilot noise variance based on a pilot signal received from a base station on a downlink and estimating a data noise variance based on a data signal received from the base station on the downlink. The method also comprises combining the pilot noise variance and the data noise variance to obtain a combined noise variance, and estimating the channel quality based on the combined noise variance.
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: October 8, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Young Geun Cho, Aditya Dua, Feng Lu, Gokhan Mergen, Subramanya P. N. Rao, Abhinav Gupta, Parvathanathan Subrahmanya
  • Patent number: 8537884
    Abstract: An algorithm to detect single path channel conditions and reduce the span (number of taps) of the equalizer in order to mitigate the performance degradation caused by noisy equalizer taps is disclosed. The algorithm provides two novel components comprising single path scenario detection and single path scenario processing or (equalizer shortening). A single path scenario is detected when the energy concentrated in a single channel impulse response tap divided by the total energy of the taps exceeds a predetermined threshold. When a single path scenario is detected, only the equalizer taps within a variable window around the equalizer tap having concentrated energy are used to filter the received signal.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: September 17, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Aditya Dua
  • Publication number: 20120281747
    Abstract: A method includes performing an operation based on transformed channel data and transformed signal data to generate a transform representation of multiple taps. The transformed channel data and the transformed signal data correspond to data received at a receiver. An inverse transform of the transform representation is determined to generate multiple taps for use at an equalizer of the receiver. At least one of the multiple taps is discarded to generate updated filter taps for the equalizer.
    Type: Application
    Filed: May 2, 2011
    Publication date: November 8, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Farrokh Abrishamkar, Aditya Dua
  • Publication number: 20120163207
    Abstract: A method, apparatus, computer program product, and processing system for generating a channel quality indicator (CQI) adapted according to the speed of a moving user equipment (UE). A CQI can be generated by mapping a calculated signal-to-noise ratio (SNR) to a CQI value. The SNR corresponds to a signal power and a noise power of a received pilot signal. The signal power and the noise power may be generated utilizing respective infinite impulse response (IIR) filters having filter coefficients chosen in accordance with the speed at which the UE moves. Selection of the filter coefficients can be made in accordance with a continuous function or a discontinuous function utilizing a threshold, and may utilize hysteresis.
    Type: Application
    Filed: October 4, 2011
    Publication date: June 28, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: Aditya Dua, Feng Lu, Vignesh Sethuraman
  • Publication number: 20120140808
    Abstract: A method of wireless communication with improved performance employs an equalizer receiver with multiple receive antennas. Equalizer taps for linear filters of the equalizer receiver are generated by determining a conditioned covariance matrix of a first data path and a second data path based on a first gain (g0) of this first data path and a second gain (g1) of the second data path. The equalizer taps of the first data path and the second data path are determined based on the conditioned covariance matrix. The first data path and the second data path are then equalized using the equalizer taps. An equalized signal is generated by combining the equalized first data path with the equalized second data path.
    Type: Application
    Filed: August 16, 2011
    Publication date: June 7, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: Aditya Dua, Lei Xiao, Je Woo Kim, Feng Lu
  • Publication number: 20120142276
    Abstract: Methods and apparatuses for data aided channel quality estimation using both pilot and data information are disclosed herein. In one exemplary aspect, a method for estimating channel quality in a wireless communication system is disclosed. The method comprises estimating a pilot noise variance based on a pilot signal received from a base station on a downlink and estimating a data noise variance based on a data signal received from the base station on the downlink. The method also comprises combining the pilot noise variance and the data noise variance to obtain a combined noise variance, and estimating the channel quality based on the combined noise variance.
    Type: Application
    Filed: December 3, 2010
    Publication date: June 7, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Young Geun Cho, Aditya Dua, Feng Lu, Gokhan Mergen, Subramanya P.N. Rao, Abhinav Gupta, Parvathanathan Subrahmanya
  • Publication number: 20120134405
    Abstract: An apparatus and method for mitigation of receive power imbalance including estimating input power levels on two diversity receive branches in a receiver; computing a power imbalance between the two diversity receive branches and determining a weaker receive branch; setting a weakRX parameter based on the weaker receive branch; computing an intercept parameter c0 for a switching curve based on the weakRX parameter; computing a threshold T based on the intercept parameter; and determining a switching decision for the receiver based on the threshold T.
    Type: Application
    Filed: July 25, 2011
    Publication date: May 31, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventors: Aditya Dua, Feng Lu
  • Publication number: 20120128054
    Abstract: An algorithm to detect single path channel conditions and reduce the span (number of taps) of the equalizer in order to mitigate the performance degradation caused by noisy equalizer taps is disclosed. The algorithm provides two novel components comprising single path scenario detection and single path scenario processing or (equalizer shortening). A single path scenario is detected when the energy concentrated in a single channel impulse response tap divided by the total energy of the taps exceeds a predetermined threshold. When a single path scenario is detected, only the equalizer taps within a variable window around the equalizer tap having concentrated energy are used to filter the received signal.
    Type: Application
    Filed: March 23, 2011
    Publication date: May 24, 2012
    Applicant: QUALCOMM INCORPORATED
    Inventor: Aditya Dua