Patents by Inventor Raja Bachu

Raja Bachu 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: 20070248037
    Abstract: Disclose is a synchronized wireless communication network (100) operating in single frequency network mode comprising a first base station (502) broadcasting, on a first channel, broadcast data and a common sequence (508) that is generated from a first channel identifier, and wherein the first base station transmits data on a common control channel. A second base station (510), adjacent to the first base station and synchronized with the first base station, the second base station simultaneously broadcasting on the first channel the broadcast data and the common sequence, and wherein the second base station transmits data on a common control channel.
    Type: Application
    Filed: April 19, 2006
    Publication date: October 25, 2007
    Inventors: Kenneth Stewart, Raja Bachu, Michael Buckley, Robert Love, Eric Schorman, Jeffrey Smolinske
  • Publication number: 20070249380
    Abstract: Disclose is a synchronized wireless communication network (100) operating in single frequency network mode comprising a first base station (502) broadcasting, on a first channel, broadcast data and a common sequence (508) that is generated from a first channel identifier, and wherein the first base station transmits data on a common control channel. A second base station (510), adjacent to the first base station and synchronized with the first base station, the second base station simultaneously broadcasting on the first channel the broadcast data and the common sequence, and wherein the second base station transmits data on a common control channel.
    Type: Application
    Filed: April 19, 2006
    Publication date: October 25, 2007
    Inventors: Kenneth Stewart, Raja Bachu, Michael Buckley, Robert Love, Eric Schorman, Jeffrey Smolinske
  • Publication number: 20070183355
    Abstract: Disclosed is a method for mobile assisted sleep mode to reduce current drain in packet based mobile systems. The method comprising the step of receiving (102) from a network a channel condition threshold. Then, monitoring (104) a channel condition while in sleep mode. Then exiting (110) sleep mode in response to the determination (108) that the monitored channel condition is greater than the channel condition threshold.
    Type: Application
    Filed: February 9, 2006
    Publication date: August 9, 2007
    Inventors: Ravi Kuchibhotla, Raja Bachu, Robert Love, Ravikiran Nory, Kenneth Stewart
  • Publication number: 20070061690
    Abstract: A method of block puncturing for turbo code based incremental redundancy includes a first step (1200) of coding an input data stream into systematic bits and parity bits. A next step (1202) includes loading the systematic bits and parity bits into respective systematic and parity block interleavers in a column-wise manner. A next step (1204) includes selecting a predefined redundancy. A next step (1206) includes outputting bits from the block interleavers in a row-wise manner in accordance with the selected predefined redundancy.
    Type: Application
    Filed: July 5, 2006
    Publication date: March 15, 2007
    Applicant: MOTOROLA, INC.
    Inventors: KENNETH STEWART, AMITAVA GHOSH, MICHAEL BUCKLEY, RAJA BACHU, RAPEEPAT RATASUK
  • Publication number: 20070033495
    Abstract: A communications system for reducing bit errors in a received data sequence provides a method for generating candidate code-word sequences for evaluation by a CRC decoder. The system may determine a most-likely received sequence using the probable code-word list of candidate sequences. The number of candidate sequences may be reduced using computational complexity reduction methods. A communications device also provides a candidate sequence generator for use with a CRC decoder to determine a most-likely received sequence and to reduce bit errors in a received sequence.
    Type: Application
    Filed: June 28, 2006
    Publication date: February 8, 2007
    Applicant: MOTOROLA, INC.
    Inventors: RAJA BACHU, Michael Buckley, Kenneth Stewart, Clint Wilkins
  • Publication number: 20070026810
    Abstract: A wireless communication terminal that communicates on a plurality of sub-carriers divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier. The terminal measures (310) a channel quality indicator (CQI) for a plurality of frequency bands, identifies (320) a subset of frequency bands for which the channel quality indicator has been measured based on a subset criterion, and transmits (330) a report identifying a subset of frequency bands for which a channel quality indicator has been measured or frequency bands not in the subset. In some embodiments, the report also includes a subset CQI value associated with at least the subset of frequency bands.
    Type: Application
    Filed: August 1, 2005
    Publication date: February 1, 2007
    Inventors: Robert Love, Raja Bachu, Brian Classon, Ravikiran Nory, Kenneth Stewart, Yakun Sun
  • Publication number: 20070026808
    Abstract: A wireless communication terminal (200) that communicates on a plurality of sub-carriers divided into a plurality of frequency bands, wherein each frequency band includes at least one sub-carrier. The terminal successively generates channel quality indicator (CQI) measurement information reports based on CQI measurements, wherein each report includes non-differential channel quality indicator measurement information for at least one of the frequency bands and differential channel quality indicator measurement information for all other frequency bands.
    Type: Application
    Filed: August 1, 2005
    Publication date: February 1, 2007
    Inventors: Robert Love, Raja Bachu, Brian Classon, Ravikiran Nory, Kenneth Stewart, Yakun Sun
  • Publication number: 20060291595
    Abstract: A method and apparatus for communications channel symbol recovery that improves equalizer performance adds together the log-likelihood ratios (LLRs) of different decision delays rather than using LLRs corresponding only to a single decision delay. A low complexity method comprises, determining an initial coarse delay and a set of fine delays (1003), estimating a training sequence and filter taps set for each fine delay (1007), determining an error function for each fine delay (1009), and linearly combining the filter taps (1013) for determining the symbol estimates (1017).
    Type: Application
    Filed: June 28, 2005
    Publication date: December 28, 2006
    Inventors: Raja Bachu, Michael Buckely, Kenneth Stewart, Clint Wilkins
  • Patent number: 7130342
    Abstract: A wireless receiver and method employs a forward/backward recursive covariance based filter coefficient generation scheme for equalizing a received wireless signal, such as a CDMA signal or other suitable signal. A forward/backward recursive covariance based filter coefficient generating circuit (206) includes a forward recursion portion (300) that receives data representing channel estimates (18) of a communication channel, and data representing an auto-covariance matrix (22). The forward recursion portion (300) produces a set of output values (306) from each iteration stage (400a–400n) of the forward recursion portion (300). The set of output values (306) are stored and a backward recursion portion (302) obtains the set of output values (306) and also receives the data representing the auto-covariance matrix (22), and generates filter coefficients (208) based on this information.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: October 31, 2006
    Assignee: Motorola, Inc.
    Inventors: Michael Eoin Buckley, Raja Bachu, Kenneth Stewart
  • Publication number: 20050084045
    Abstract: An iterative method (400) and apparatus (200) for a receiver for reducing interference in a desired signal in a GSM communication system uses a finite-impulse-response filter combined with alternate quadrature component output selection for alternate linear equalization are disclosed The method includes inputting a burst of data of a received waveform including interference, training an alternate linear output filter with a midamble of known quadrature phase, providing an estimate of the desired signal by operating on the received waveform with the finite-impulse-response filter, generating log likelihood ratio estimates for a plurality of bits in the burst of data, selecting bits from the burst of data base upon a predetermined condition, and re-training the alternate linear output filter to provide a second improved estimate of the desired signal.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 21, 2005
    Inventors: Kenneth Stewart, Raja Bachu, Michael Buckley, Clint Wilkins
  • Publication number: 20050084040
    Abstract: A method of modulation detection. A signal is received. A first decision statistic can be generated based on the received signal. The received signal can be transformed. A second decision statistic can be generated based on the transformed received signal. A selected modulation type can be determined based on comparing the first decision statistic with the second decision statistic.
    Type: Application
    Filed: October 20, 2003
    Publication date: April 21, 2005
    Inventors: Kenneth Stewart, Raja Bachu, Michael Buckley, Clint Wilkins
  • Publication number: 20040125895
    Abstract: A wireless receiver and method employs a forward/backward recursive covariance based filter coefficient generation scheme for equalizing a received wireless signal, such as a CDMA signal or other suitable signal. A forward/backward recursive covariance based filter coefficient generating circuit (206) includes a forward recursion portion (300) that receives data representing channel estimates (18) of a communication channel, and data representing an auto-covariance matrix (22). The forward recursion portion (300) produces a set of output values (306) from each iteration stage (400a-400n) of the forward recursion portion (300). The set of output values (306) are stored and a backward recursion portion (302) obtains the set of output values (306) and also receives the data representing the auto-covariance matrix (22), and generates filter coefficients (208) based on this information.
    Type: Application
    Filed: December 27, 2002
    Publication date: July 1, 2004
    Inventors: Michael Eoin Buckley, Raja Bachu, Kenneth Stewart