Patents by Inventor Nagabhushana Sindhushayana
Nagabhushana Sindhushayana 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: 9991986Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: GrantFiled: June 9, 2016Date of Patent: June 5, 2018Assignee: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter Black
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Publication number: 20160294506Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: ApplicationFiled: June 9, 2016Publication date: October 6, 2016Applicant: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter Black
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Patent number: 9419751Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: GrantFiled: May 8, 2014Date of Patent: August 16, 2016Assignee: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter J. Black
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Patent number: 8873534Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: GrantFiled: January 25, 2011Date of Patent: October 28, 2014Assignee: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter J. Black
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Publication number: 20140241249Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: ApplicationFiled: May 8, 2014Publication date: August 28, 2014Applicant: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter J. Black
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Patent number: 8363604Abstract: A network entity includes a processor configured to regulate the data rate of transmissions over a wireless channel from a base station to a subscriber station based on feedback from the subscriber station, the feedback relating to the wireless channel conditions, the processor being further configured to determine a substitute data rate for one or more transmissions over the wireless channel.Type: GrantFiled: January 31, 2006Date of Patent: January 29, 2013Assignee: QUALCOMM IncorporatedInventors: Mehmet Gurelli, Mehmet Yavuz, Rashid A. Attar, Nagabhushana Sindhushayana, Rajesh K. Pankaj
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Patent number: 8165619Abstract: A power allocation value for power control information transmitted from a first station to a plurality of stations is determined by receiving data rate control information from the plurality of stations in a communications system. Supplemental information relating to the data rate control information is then generated, and an improved signal strength value is produced in accordance with the supplemental information. The power allocation value for the power control information transmitted from the first station to the plurality of stations is determined in accordance with the improved signal strength value.Type: GrantFiled: October 2, 2002Date of Patent: April 24, 2012Assignee: Qualcomm IncorporatedInventors: Rashid Ahmed Attar, Nagabhushana Sindhushayana, Peter J. Black
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Publication number: 20120026939Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: ApplicationFiled: January 25, 2011Publication date: February 2, 2012Applicant: QUALCOMM INCORPORATEDInventors: Nagabhushana Sindhushayana, Peter J. Black
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Patent number: 7953062Abstract: In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.Type: GrantFiled: January 12, 2006Date of Patent: May 31, 2011Assignee: QUALCOMM IncorporatedInventors: Nagabhushana Sindhushayana, Peter J. Black
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Patent number: 7881394Abstract: A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio (LLR) metrics on code symbols are estimated as products of various constant values and various combinations of the in-phase and quadrature components of a demodulated soft decision. In the implementation associated with the 16QAM modulation scheme, an estimate of the carrier-signal-to-interference (C/I) ratio is also used to estimate some of the LLR metrics. Estimates of the LLR metrics may also be obtained in association with generalized square QAM and M-ary PSK modulation schemes including, e.g., 64QAM, 256QAM, and 16PSK.Type: GrantFiled: April 29, 2008Date of Patent: February 1, 2011Assignee: Qualcomm IncorporatedInventor: Nagabhushana Sindhushayana
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Patent number: 7796563Abstract: An apparatus for selecting a best serving sector in a code division multiple access (CDMA) communication system. A comparator compares a plurality of signal levels received from a plurality of active sectors with a signal level of a current serving sector to produce a difference. A delta generator is coupled to the comparator that generates a delta credit for each of the plurality of active sectors based on the difference. An accumulator is coupled to the delta generator and accumulates a plurality of delta credits to produce an accumulated total credit. A best sector identifier that is coupled to the accumulator identifies the best serving sector from the accumulated total credit.Type: GrantFiled: November 12, 2003Date of Patent: September 14, 2010Assignee: QUALCOMM IncorporatedInventors: Qiang Wu, Nagabhushana Sindhushayana, Peter J. Black, Rajiv Vijayan, Rashid Attar
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Patent number: 7702986Abstract: Method and apparatus for generating codewords with variable length and redundancy from a single Low-Density Parity-Check (LDPC) code with variable length input words. A mother code for encoding data words is generated based on a parity-check matrix, wherein the mother code is adjusted to reflect the size of the data word to be encoded. A generator matrix applies the mother code to data words to produce codewords for transmission. In one embodiment, a reduction criteria is determined and the size of the generator matrix reduced in response. The corresponding parity-check matrix is applied at the receiver for decoding the received codeword.Type: GrantFiled: November 18, 2002Date of Patent: April 20, 2010Assignee: Qualcomm IncorporatedInventors: Bjorn A. Bjerke, John W. Ketchum, Nagabhushana Sindhushayana, Jay Rod Walton
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Publication number: 20100093387Abstract: Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold Eb/Nt needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.Type: ApplicationFiled: December 11, 2009Publication date: April 15, 2010Applicant: QUALCOMM IncorporatedInventors: Tao Chen, Jack M. Holtzman, Fuyun Ling, Keith Saints, Nagabhushana Sindhushayana, Charles E. Wheatley, III
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Patent number: 7693213Abstract: Methods and apparatus for estimating a transmission power required for data transmission in a communication system are disclosed. A terminal determines a quality metric of a communication link, over which data are to be transmitted, and modifies the determined quality metric by a quality metric margin. The terminal then estimates the maximum rate of data in accordance with the modified quality metric. Alternatively, the terminal estimates transmission power required for data transmission with a data rate in accordance with the modified quality metric. The quality metric margin may be a pre-determined or dynamically adjusted. The terminal dynamically adjusts the quality metric margin in accordance with a result of comparison of a transmit power corresponding to the estimated maximum rate of data with an actual transmit power used to transmit the data.Type: GrantFiled: January 25, 2007Date of Patent: April 6, 2010Assignee: QUALCOMM, Inc.Inventors: Nagabhushana Sindhushayana, Peter John Black, Rashid Ahmed Akbar Attar
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Patent number: 7643842Abstract: Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold Eb/Nt needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.Type: GrantFiled: July 12, 2004Date of Patent: January 5, 2010Assignee: QUALCOMM IncorporatedInventors: Tao Chen, Jack M. Holtzman, Fuyun Ling, Keith Saints, Nagabhushana Sindhushayana, Charles E. Wheatley, III
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Publication number: 20090323846Abstract: A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio (LLR) metrics on code symbols are estimated as products of various constant values and various combinations of the in-phase and quadrature components of a demodulated soft decision. In the implementation associated with the 16QAM modulation scheme, an estimate of the carrier-signal-to-interference (C/I) ratio is also used to estimate some of the LLR metrics. Estimates of the LLR metrics may also be obtained in association with generalized square QAM and M-ary PSK modulation schemes including, e.g., 64QAM, 256QAM, and 16PSK.Type: ApplicationFiled: April 29, 2008Publication date: December 31, 2009Applicant: QUALCOMM INCORPORATEDInventor: Nagabhushana Sindhushayana
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Patent number: 7583744Abstract: A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio (LLR) metrics on code symbols are estimated as products of various constant values and various combinations of the in-phase and quadrature components of a demodulated soft decision. In the implementation associated with the 16QAM modulation scheme, an estimate of the carrier-signal-to-interference (C/I) ratio is also used to estimate some of the LLR metrics. Estimates of the LLR metrics may also be obtained in association with generalized square QAM and M-ary PSK modulation schemes including, e.g., 64QAM, 256QAM, and 16PSK.Type: GrantFiled: February 5, 2007Date of Patent: September 1, 2009Inventor: Nagabhushana Sindhushayana
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Patent number: 7564794Abstract: A method and an apparatus for waveform quality measurement are disclosed. An actual signal, representing a waveform channelized both in time and in code is generated by, e.g., an exemplary HDR communication system. Test equipment generates an ideal waveform corresponding to the actual waveform. The test equipment then generates an estimate of offsets between parameters of the actual waveform and the ideal waveform, and the offsets are used to compensate the actual waveform. The test equipment then evaluates various waveform quality measurements utilizing the compensated actual waveform and the corresponding ideal waveform. Definitions of the various waveform quality measurements as well as conceptual and practical examples of processing of the actual waveform and the corresponding ideal waveform by the test equipment are disclosed. The disclosed method and apparatus may be extended to any waveform channelized both in time and in code regardless of the equipment that generated the waveform.Type: GrantFiled: December 5, 2003Date of Patent: July 21, 2009Assignee: QUALCOMM, IncorporatedInventors: Juan Montojo, Nagabhushana Sindhushayana, Peter Black
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Patent number: 7433384Abstract: Method and apparatus to compute the combiner coefficients for wireless communication systems for a space-time solution. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. A Minimizing Mean Square Error, MMSE, approach is applied allowing weight combining on a per path basis. The weights are calculated as a function of a noise correlation matrix and spatial signature per path. The noise correlation matrix is determined from an autocorrelation matrix of the received signal. In one embodiment, the MMSE approach is applied to a non-time gated pilot signal.Type: GrantFiled: January 9, 2006Date of Patent: October 7, 2008Assignee: QUALCOMM IncorporatedInventors: John Edward Smee, Nagabhushana Sindhushayana
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Publication number: 20080101307Abstract: Partitioning resources so that they can be operated in different modes and synchronizing these partitioning among different sectors so that they can employ mutually cooperative power allocation settings are provided. The resources can be partitioned into one of two modes, namely, block mode or distributed mode. A user can be synchronized according to the mode and a zone, which can be based in part on the mode. The synchronization can be based on bit reversal order or quasi-uniform spacing of tones.Type: ApplicationFiled: September 28, 2007Publication date: May 1, 2008Inventors: Nagabhushana Sindhushayana, Alexei Gorokhov