Patents by Inventor Vinesh Bhunjun
Vinesh Bhunjun 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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Patent number: 8457256Abstract: Methods and systems to compute likelihood measures of demodulated, complex-coordinate data points, to and dynamically scale the likelihood measures as a function of a channel statistic, and to decode the data points from the scaled likelihood measures. Likelihood measures may be computed relative to all points, or a subset of points of a reference constellation, such as a subset of one or more nearest constellation points. Likelihood measures may be scaled as a function of a channel frequency response variance amongst a plurality of carriers, such as carriers of an OFDM signal, and/or as a function of a channel impulse response variance.Type: GrantFiled: August 25, 2010Date of Patent: June 4, 2013Assignee: Intel CorporationInventors: Sahan S. Gamage, Bernard Arambepola, Thushara Hewavithana, Parveen K. Shukla, Vinesh Bhunjun
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Patent number: 8406343Abstract: Methods and systems to resolve cyclic ambiguity of a scattered-pilot based channel impulse response as a function of transmission parameter signalling (TPS), such as in a single frequency network, including to zero-pad a first orientation of the channel impulse response to an interval of an effective symbol duration of the multi-carrier signal, compute a channel frequency response from the zero-padded first orientation of the channel impulse response, and correlate components of the channel frequency response corresponding to frequencies of TPS carriers with raw channel frequency response data of obtained from the TPS carriers. Frequency response components of multiple zero-padded orientations of the channel impulse response may be correlated with the raw TPS carrier data to identify an optimum orientation of the channel impulse response. Frequency response components of subsequent zero-padded orientations may be iteratively computed from components of preceding orientations.Type: GrantFiled: August 25, 2010Date of Patent: March 26, 2013Assignee: Intel CorporationInventors: Thushara Hewavithana, Bernard Arambepola, Parveen K. Shukla, Sahan S. Gamage, Vinesh Bhunjun
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Patent number: 8392802Abstract: Methods and systems to identify a codeword associated with samples of a signal from spectral content of the samples, and to estimate a frequency offset from the spectral contents. The samples may correspond to a physical layer header of a data frame. Modulation may be removed from the samples in accordance with each of a plurality of modulation sequences, each sequence associated with a corresponding codeword. Power levels in spectral contents of the modulation-removed samples are examined to identify a peak power level indicative of a match between a modulation sequence and the samples. The corresponding codeword is identified as being associated with the header, and transmission parameters associated with the identified codeword are used to decode a corresponding frame. An estimated frequency offset may be determined from a frequency associated with the peak power level.Type: GrantFiled: December 23, 2009Date of Patent: March 5, 2013Assignee: Intel CorporationInventors: Bernard Arambepola, Vinesh Bhunjun, Thushara Hewavithana, Parveen K. Shukla, Sahan Gamage
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Patent number: 8234556Abstract: Embodiments of a broadcast receiver and method for optimizing a scale factor in a log-likelihood ratio (LLR) mapper are generally described herein. In some embodiments, the broadcast receiver includes an LLR mapper to generate LLRs from demodulated data samples, a low-density parity-check (LDPC) decoder to generate decoded data from the LLRs, and an LLR optimizer to dynamically select a scale factor for the LLR mapper based on a number of iterations for convergence of the LDPC decoder. In some embodiments, the LLR optimizer iteratively revises the scale factor during receipt of broadcast signals until the number of iterations of the iterative decoder is either minimized for convergence or minimized for convergence failures.Type: GrantFiled: December 30, 2008Date of Patent: July 31, 2012Assignee: Intel CorporationInventors: Sahan S. Gamage, Bernard Arambepola, Thushara Hewavithana, Parveen K. Shukla, Vinesh Bhunjun
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Patent number: 8204156Abstract: Apparatuses, systems, and methods that employ conditional probabilities to calculate phase errors are disclosed. For a received signal, the embodiments may develop several phase error estimates relative to each point of a constellation, the number and location of points of the constellation depending on the modulation technique of the received signal. In addition to calculating the phase error estimates, the embodiments may also calculate weights, or probabilities, associated with each of the estimates. The embodiments may use the estimates and the weights to calculate a composite phase error estimate. The composite phase error estimate may be used to correct the received signal and eliminate or reduce the impact of the phase error.Type: GrantFiled: December 31, 2008Date of Patent: June 19, 2012Assignee: Intel CorporationInventors: Thushara Hewavithana, Bernard Arambepola, Parveen K. Shukla, Sahan S. Gamage, Vinesh Bhunjun
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Publication number: 20120051471Abstract: Methods and systems to resolve cyclic ambiguity of a scattered-pilot based channel impulse response as a function of transmission parameter signalling (TPS), such as in a single frequency network, including to zero-pad a first orientation of the channel impulse response to an interval of an effective symbol duration of the multi-carrier signal, compute a channel frequency response from the zero-padded first orientation of the channel impulse response, and correlate components of the channel frequency response corresponding to frequencies of TPS carriers with raw channel frequency response data of obtained from the TPS carriers. Frequency response components of multiple zero-padded orientations of the channel impulse response may be correlated with the raw TPS carrier data to identify an optimum orientation of the channel impulse response. Frequency response components of subsequent zero-padded orientations may be iteratively computed from components of preceding orientations.Type: ApplicationFiled: August 25, 2010Publication date: March 1, 2012Inventors: Thushara Hewavithana, Bernard Arambepola, Parveen K. Shukla, Sahan S. Gamage, Vinesh Bhunjun
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Publication number: 20120051469Abstract: Methods and systems to compute likelihood measures of demodulated, complex-coordinate data points, to and dynamically scale the likelihood measures as a function of a channel statistic, and to decode the data points from the scaled likelihood measures. Likelihood measures may be computed relative to all points, or a subset of points of a reference constellation, such as a subset of one or more nearest constellation points. Likelihood measures may be scaled as a function of a channel frequency response variance amongst a plurality of carriers, such as carriers of an OFDM signal, and/or as a function of a channel impulse response variance.Type: ApplicationFiled: August 25, 2010Publication date: March 1, 2012Inventors: Sahan S. Gamage, Bernard Arambepola, Thushara Hewavithana, Parveen K. Shukla, Vinesh Bhunjun
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Publication number: 20110154148Abstract: Methods and systems to identify a codeword associated with samples of a signal from spectral content of the samples, and to estimate a frequency offset from the spectral contents. The samples may correspond to a physical layer header of a data frame. Modulation may be removed from the samples in accordance with each of a plurality of modulation sequences, each sequence associated with a corresponding codeword. Power levels in spectral contents of the modulation-removed samples are examined to identify a peak power level indicative of a match between a modulation sequence and the samples. The corresponding codeword is identified as being associated with the header, and transmission parameters associated with the identified codeword are used to decode a corresponding frame. An estimated frequency offset may be determined from a frequency associated with the peak power level.Type: ApplicationFiled: December 23, 2009Publication date: June 23, 2011Inventors: Bernard Arambepola, Vinesh Bhunjun, Thushara Hewavithana, Parveen K. Shukla, Sahan Gamage
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Publication number: 20100169734Abstract: Embodiments of a broadcast receiver and method for optimizing a scale factor in a log-likelihood ratio (LLR) mapper are generally described herein. In some embodiments, the broadcast receiver includes an LLR mapper to generate LLRs from demodulated data samples, a low-density parity-check (LDPC) decoder to generate decoded data from the LLRs, and an LLR optimizer to dynamically select a scale factor for the LLR mapper based on a number of iterations for convergence of the LDPC decoder. In some embodiments, the LLR optimizer iteratively revises the scale factor during receipt of broadcast signals until the number of iterations of the iterative decoder is either minimized for convergence or minimized for convergence failures.Type: ApplicationFiled: December 30, 2008Publication date: July 1, 2010Inventors: Sahan S. Gamage, Bernard Arambepola, Thushara Hewavithana, Parveen K. Shukla, Vinesh Bhunjun
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Publication number: 20100166115Abstract: Apparatuses, systems, and methods that employ conditional probabilities to calculate phase errors are disclosed. For a received signal, the embodiments may develop several phase error estimates relative to each point of a constellation, the number and location of points of the constellation depending on the modulation technique of the received signal. In addition to calculating the phase error estimates, the embodiments may also calculate weights, or probabilities, associated with each of the estimates. The embodiments may use the estimates and the weights to calculate a composite phase error estimate. The composite phase error estimate may be used to correct the received signal and eliminate or reduce the impact of the phase error.Type: ApplicationFiled: December 31, 2008Publication date: July 1, 2010Inventors: Thushara Hewavithana, Bernard Arambepola, Parveen K. Shukla, Sahan S. Gamage, Vinesh Bhunjun