Patents by Inventor Badri Varadarajan

Badri Varadarajan 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: 20080292013
    Abstract: Embodiments of the present disclosure provide a transmitter, a receiver and methods of operating a transmitter and a receiver. In one embodiment, the transmitter is for use with NT transmit antennas and includes a precoder unit configured to precode data for transmission using a preceding matrix selected from a nested codebook, wherein the nested codebook provides codebooks corresponding to different transmission layers that are derived from column subsets of multiple NT×NT preceding matrices. The transmitter also includes a transmit unit configured to transmit the precoded data. In another embodiment, the receiver includes a receive unit configured to receive preceded data. The receiver also includes a precoder selection unit configured to select a preceding matrix from a nested codebook for the preceded data, wherein the nested codebook provides codebooks corresponding to different transmission layers that are derived from column subsets of multiple NT×NT preceding matrices.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 27, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Badri Varadarajan, Eko N. Onggosanusi, Runhua Chen, IL H. Kim
  • Publication number: 20080273497
    Abstract: A method of wireless handover in a broadcast network (FIGS. 5 and 8) is disclosed. A wireless receiver (FIG. 4) receives a first signal (N) from a first transmitter (f1). The receiver measures a signal strength (RSSI) of the first signal. The strength of the first signal is compared to a first threshold (T0). The receiver receives a second signal (N+3) from a second transmitter (f3) in response to the step of comparing. The first and the second signals are sent to an application processor (120). The wireless receiver continues to receive the first and second signals until the application processor terminates receiving one of the first and second signals.
    Type: Application
    Filed: May 4, 2007
    Publication date: November 6, 2008
    Inventors: Xiaolin Lu, Rao Venkatasadasiva, Zigang Yang, Anand G. Dabak, Srinath Hosur, Badri Varadarajan, Susan Yim
  • Publication number: 20080219370
    Abstract: Embodiments of the present disclosure provide a feedback encoder, a feedback decoder and methods of operating the same. The feedback encoder, for use with user equipment, includes an encoding module configured to provide a rank indicator that is separately reportable from a related selection of at least one of a channel quality indicator and a preceding matrix indicator for the user equipment. The feedback encoder also includes a transmit module configured to transmit the rank indicator and the related selection. The feedback decoder, for use with a base station, includes a receive module configured to receive a rank indicator that is separately reportable from a related selection of at least one of a channel quality indicator and a preceding matrix indicator for user equipment. The feedback decoder also includes a decoding module configured to decode the rank indicator and the related selection for the base station.
    Type: Application
    Filed: March 4, 2008
    Publication date: September 11, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Eko N. Onggosanusi, Runhua Chen, Zukang Shen, Badri Varadarajan
  • Publication number: 20080207135
    Abstract: Embodiments of a feedback generator and decoder and methods of operating the feedback generator and decoder are presented. In one embodiment, the feedback generator includes a CQI compression module configured to provide a compressed CQI for the user equipment corresponding to at least one sub-band, where a sub-band is composed of at least one resource block. The feedback generator also includes a transmit module coupled to the CQI compression module and configured to transmit the compressed CQI to a serving base station. In one embodiment, the feedback decoder includes a receive module configured to receive a compressed CQI in the base station from user equipment corresponding to at least one sub-band. The feedback decoder also includes a CQI restoration module coupled to the receive module and configured to provide a restored CQI from the compressed CQI for the at least one sub-band.
    Type: Application
    Filed: February 22, 2008
    Publication date: August 28, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Badri Varadarajan, Eko N. Onggosanusi, Runhua Chen, IL H. Kim
  • Publication number: 20080063115
    Abstract: Embodiments of the present disclosure provide a transmitter, a receiver and methods of operating a transmitter and a receiver. In one embodiment, the transmitter has at least three transmit antennas and includes a feedback decoding portion configured to recover at least one group-based channel quality indicator provided by a feedback signal from a receiver, wherein each group-based channel quality indicator corresponds to one of a set of transmission layer groupings. The transmitter also includes a modulator portion configured to generate at least one symbol stream and a mapping portion configured to multiplex each symbol stream to at least one transmission layer grouping. The transmitter further includes a pre-coder portion configured to couple the transmission layers to the transmit antennas for a transmission. The receiver includes a decoder portion which is configured to use decoded signals from at least one group to decode the other groups.
    Type: Application
    Filed: September 7, 2007
    Publication date: March 13, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Badri Varadarajan, Eko N. Onggosanusi
  • Publication number: 20080013610
    Abstract: The present disclosure provides a receiver, a transmitter and methods of operating a receiver and a transmitter. In one embodiment, the receiver includes a receive portion employing transmission signals from a transmitter, having multiple transmit antennas, that is capable of transmitting at least one spatial codeword and adapting a transmission rank. The receiver also includes a feedback generator portion configured to provide a channel quality indicator that is feedback to the transmitter, wherein the channel quality indicator corresponds to at least one transmission rank.
    Type: Application
    Filed: June 6, 2007
    Publication date: January 17, 2008
    Applicant: Texas Instruments Inc.
    Inventors: Badri Varadarajan, Eko Onggosanusi
  • Publication number: 20070286262
    Abstract: A wireless receiver providing multiple services (FIG. 3) is disclosed. The wireless receiver includes an oscillator circuit (304, FIG. 4) arranged to produce a reference frequency (308). A first receiver (302) receives a first signal (300) having a first carrier frequency in response to the reference frequency. A second receiver (322) receives a second signal (320) having a second carrier frequency different from the first carrier frequency in response to the reference frequency.
    Type: Application
    Filed: June 8, 2007
    Publication date: December 13, 2007
    Inventors: Charles Kasimer Sestok, Badri Varadarajan, Anand Ganesh Dabak
  • Publication number: 20070217540
    Abstract: The present invention provides a receiver. In one embodiment, the receiver includes a receive portion employing transmission signals from a transmitter having multiple antennas and capable of providing channel estimates. The receiver also includes a feedback generator portion configured to provide to the transmitter a pre-coder selection for data transmission that is based on the channel estimates, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks. The present invention also provides a transmitter having multiple antennas. In one embodiment, the transmitter includes a transmit portion coupled to the multiple antennas and capable of applying pre-coding to a data transmission for a receiver. The transmitter also includes a feedback decoding portion configured to decode a pre-coder selection for the data transmission that is fed back from the receiver, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks.
    Type: Application
    Filed: March 20, 2007
    Publication date: September 20, 2007
    Applicant: Texas Instrumens Incorporated
    Inventors: Eko N. Onggosanusi, Badri Varadarajan, Anand G. Dabak
  • Publication number: 20060250941
    Abstract: A method of transmitting a wireless signal (FIGS. 3A-3C) is disclosed. A data stream is divided (306) into a first data stream and a second data stream. The first data stream is encoded (300) at a first data rate. The second data stream is encoded (320) at a second data rate different from the first data rate. A first part of the encoded first data stream is transmitted from a first transmit antenna (308). A second part of the encoded first data stream is transmitted from a second transmit antenna (312).
    Type: Application
    Filed: May 5, 2006
    Publication date: November 9, 2006
    Inventors: Eko Onggosanusi, Anand Dabak, Timothy Schmidl, Badri Varadarajan
  • Publication number: 20060222099
    Abstract: A method of estimating a channel length (304) in a wireless receiver is disclosed. The receiver receives a signal (122) from a remote transmitter. The receiver selects a plurality (K) of different candidate channel lengths and determines a respective criterion value (402) of the signal for each of the plurality of different candidate channel lengths. The receiver selects a channel length (410) from the plurality of different candidate channel lengths in response to the respective criterion value (404).
    Type: Application
    Filed: March 23, 2006
    Publication date: October 5, 2006
    Inventors: Badri Varadarajan, Anand Dabak, Charles Sestok, Srinath Hosur