Patents by Inventor Kamlesh Rath
Kamlesh Rath 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: 8825102Abstract: Systems and methods for regulating transmit power in a mobile station to comply with SAR limits are disclosed. A mobile station may include a processor, transmitter, and proximity sensor. The transmitter is configured to operate at a transmit power controlled by a first transmit power limit. The proximity sensor identifies how close the mobile station is to a human head. A transmit power regulator, implemented on the processor, determines the cumulative energy radiated by the transmitter over a specified number of frames. If the cumulative energy exceeds an energy limit based on a SAR limit, and the proximity sensor indicates that the mobile station is close to a human head, the transmit power regulator may decrease the transmit power limit of the transmitter.Type: GrantFiled: September 21, 2011Date of Patent: September 2, 2014Assignee: Broadcom CorporationInventors: Soumen Chakraborty, Rishi Ranjan, Kamlesh Rath, Manish Airy
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Patent number: 8811918Abstract: Various embodiments of the present invention recognize at least two zones of operation for a communication device. In a first zone, which is sufficiently spaced away from a human head or body that SAR limits will be met, transmit power delivered to an antenna of a communication device may be maximized within any other constraints under which the communication device operates. In a second zone, which is not sufficiently spaced away from a human head or body, transmit power is redistributed such that SAR limitations are met without affecting the transmit power control loop of the communication device. For example, a second antenna physically disposed at a different location within the communication device may be used either instead of, or in addition to, the first transmit antenna in order that the SAR limits are met.Type: GrantFiled: November 28, 2011Date of Patent: August 19, 2014Assignee: Broadcom CorporationInventors: Kamlesh Rath, Erik Stauffer, Rishi Ranjan, Soumen Chakraborty, Manish Airy, Bertrand Hochwald, Robert Lorenz, Richard Compton, Rakesh Agrawal
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Patent number: 8761126Abstract: Methods and systems of a mobile station transmitting information to a base station are disclosed. The mobile station may transmit information with improved uplink coverage, and bandwidth requests may be more efficient. Additionally, the mobile station may transmit information over multiple uplink frames using hybrid ARQ.Type: GrantFiled: March 22, 2011Date of Patent: June 24, 2014Assignee: Broadcom CorporationInventors: Kamlesh Rath, Rishi Ranjan, Manish Airy, Sindhu Verma, Soumen Chakraborty
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Patent number: 8750236Abstract: Embodiments for a method and apparatus of selecting a transmission mode between the subscriber and a base station are disclosed. One method includes determining a predictive window. Instantaneous channel quality measurements are averaged, wherein the averaging is dependent upon a size of the predictive window. A first estimate of the transmission mode is determined based on the averaged instantaneous channel quality measurements. A margin is calculated based on reception of a qualifying downlink transmission. The transmission mode is selected by updating the first estimate with the margin.Type: GrantFiled: September 14, 2012Date of Patent: June 10, 2014Assignee: Broadcom CorporationInventors: Kameswara Medapalli, Djordje Tujkovic, Kamlesh Rath, Louay Jalloul, Bertrand Hochwald
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Publication number: 20140148119Abstract: Systems and methods for enabling a group of user equipments located in an emergency area to cooperatively transmit an emergency (SOS) message to a cellular network and to cooperatively receive an SOS message (or response) from the cellular network are provided. Embodiments further provide a scheme for enabling dedicated receivers, and/or user equipments that are attached to the cellular network to serve as relay stations for SOS messages, thereby extending the coverage of the cellular network to the emergency area.Type: ApplicationFiled: March 15, 2013Publication date: May 29, 2014Applicant: Broadcom CorporationInventors: Erik STAUFFER, Djordje TUJKOVIC, Hyunn Jong YANG, Kamlesh RATH, Shao-Cheng WANG, Robert LORENZ, Pavan NUGGEHALLI, Soumen CHAKRABORTY
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Publication number: 20130258873Abstract: Embodiments of a method and apparatus for performing an adaptive transmission scheme in a frequency division duplexing communication system based on channel state information estimated using an open-loop mode are described herein. In one example, the method includes estimating an impulse response of a channel using a signal received over a first frequency band of the channel from a device, transforming the impulse response into a frequency response of the channel, and subsequently performing the adaptive transmission scheme using the frequency response to transmit a signal to the device over a second frequency band of the channel that is different from the first frequency band.Type: ApplicationFiled: March 30, 2012Publication date: October 3, 2013Applicant: Broadcom CorporationInventors: Erik Richard Stauffer, Kamlesh Rath, Ying Xia, Bertrand Hochwald
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Patent number: 8488610Abstract: A method and system for communicating packets in a Wireless Multicast and Broadcast communication network is provided. The method includes selecting a Modulation and Coding Scheme (MCS) for transmission of a packet. The packet is then transmitted using the selected MCS on at least one of a subset of available time slots, a subset of available frequency sub-carriers and a subset of available antennas. Thereafter, it is autonomously decided whether the plurality of transmitters are to retransmit the packet. Then, the packet is retransmitted on at least one of a different subset of time slots, a different subset of frequency sub-carriers and a different subset of antennas.Type: GrantFiled: May 16, 2007Date of Patent: July 16, 2013Assignee: Broadcom CorporationInventors: Kameswara Medapalli, Louay Jalloul, Kamlesh Rath
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Publication number: 20130170418Abstract: A wireless communication device is disclosed that includes multiple antennas capable of being used for carrier aggregation, and that uses its additional antennas to scan for available base stations without interfering with connectivity to a current base station and/or while maximizing useable bandwidth. The wireless communication device may scan using multiple of the antennas to maximize scanning results and reduce scan time, and may scan for available base stations using some of its antennas while maintaining its connection to the current base station with its other antennas. The device can also analyze control channel portions of received signals to utilize periods of signal inactivity to scan for available base stations, such as DRX or SPS modes of operation. In addition, the device can measure various parameters to optimize its scanning capabilities.Type: ApplicationFiled: September 28, 2012Publication date: July 4, 2013Inventors: Erik STAUFFER, Robert Gustav LORENZ, Kamlesh RATH
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Publication number: 20130010734Abstract: Embodiments for a method and apparatus of selecting a transmission mode between the subscriber and a base station are disclosed. One method includes determining a predictive window. Instantaneous channel quality measurements are averaged, wherein the averaging is dependent upon a size of the predictive window. A first estimate of the transmission mode is determined based on the averaged instantaneous channel quality measurements. A margin is calculated based on reception of a qualifying downlink transmission. The transmission mode is selected by updating the first estimate with the margin.Type: ApplicationFiled: September 14, 2012Publication date: January 10, 2013Applicant: Broadcom CorporationInventors: Kameswara Medapalli, Djordje Tujkovic, Kamlesh Rath, Louay Jalloul, Bertrand Hochwald
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Patent number: 8311003Abstract: Embodiments for a method and apparatus of selecting a transmission mode between the subscriber and a base station are disclosed. One method includes determining a predictive window. Instantaneous channel quality measurements are averaged, wherein the averaging is dependent upon a size of the predictive window. A first estimate of the transmission mode is determined based on the averaged instantaneous channel quality measurements. A margin is calculated based on reception of a qualifying downlink transmission. The transmission mode is selected by updating the first estimate with the margin.Type: GrantFiled: June 18, 2009Date of Patent: November 13, 2012Assignee: Broadcom CorporationInventors: Kameswara Medapalli, Djordje Tujkovic, Kamlesh Rath, Louay Jalloul, Bertrand Hochwald
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Publication number: 20120213149Abstract: A method and system are provided in which a mobile device may be operable for long term evolution (LTE) communication or some other wireless technology via two or more transmit antennas. The device may comprise a power amplifier for each transmit antenna with substantially similar maximum power being provided by both amplifiers. A power headroom value may be determined in the device based on path loss values between the transmit antennas and a base station and the maximum transmit power for each transmit antenna. Transmission via one of the transmit antennas may occur concurrently with transmission via another of the transmit antennas. The device may generate an indication of the determined power headroom value for communication to the base station. The power headroom value may be reported periodically or in response to a change in the power received at the base station.Type: ApplicationFiled: March 31, 2011Publication date: August 23, 2012Inventors: Soumen Chakraborty, Rishi Ranjan, Erik Stauffer, Kamlesh Rath, Manish Airy
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Publication number: 20120142291Abstract: Various embodiments of the present invention recognize at least two zones of operation for a communication device. In a first zone, which is sufficiently spaced away from a human head or body that SAR limits will be met, transmit power delivered to an antenna of a communication device may be maximized within any other constraints under which the communication device operates. In a second zone, which is not sufficiently spaced away from a human head or body, transmit power is redistributed such that SAR limitations are met without affecting the transmit power control loop of the communication device. For example, a second antenna physically disposed at a different location within the communication device may be used either instead of, or in addition to, the first transmit antenna in order that the SAR limits are met.Type: ApplicationFiled: November 28, 2011Publication date: June 7, 2012Applicant: Broadcom CorporationInventors: Kamlesh Rath, Erik Stauffer, Rishi Ranjan, Soumen Chakraborty, Manish Airy, Bertrand Hochwald, Robert Lorenz, Richard Compton, Rakesh Agrawal
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Publication number: 20120071195Abstract: Systems and methods for regulating transmit power in a mobile station to comply with SAR limits are disclosed. A mobile station may include a processor, transmitter, and proximity sensor. The transmitter is configured to operate at a transmit power controlled by a first transmit power limit. The proximity sensor identifies how close the mobile station is to a human head. A transmit power regulator, implemented on the processor, determines the cumulative energy radiated by the transmitter over a specified number of frames. If the cumulative energy exceeds an energy limit based on a SAR limit, and the proximity sensor indicates that the mobile station is close to a human head, the transmit power regulator may decrease the transmit power limit of the transmitter.Type: ApplicationFiled: September 21, 2011Publication date: March 22, 2012Applicant: Broadcom CorporationInventors: Soumen Chakraborty, Rishi Ranjan, Kamlesh Rath, Manish Airy
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Publication number: 20110228747Abstract: Methods and systems of a mobile station transmitting information to a base station are disclosed. The mobile station may transmit information with improved uplink coverage, and bandwidth requests may be more efficient. Additionally, the mobile station may transmit information over multiple uplink frames using hybrid ARQ.Type: ApplicationFiled: March 22, 2011Publication date: September 22, 2011Inventors: Kamlesh Rath, Rishi Ranjan, Manish Airy, Sindhu Verma, Soumen Chakraborty
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Publication number: 20090316636Abstract: Embodiments for a method and apparatus of selecting a transmission mode between the subscriber and a base station are disclosed. One method includes determining a predictive window. Instantaneous channel quality measurements are averaged, wherein the averaging is dependent upon a size of the predictive window. A first estimate of the transmission mode is determined based on the averaged instantaneous channel quality measurements. A margin is calculated based on reception of a qualifying downlink transmission. The transmission mode is selected by updating the first estimate with the margin.Type: ApplicationFiled: June 18, 2009Publication date: December 24, 2009Inventors: Kameswara Medapalli, Djordje Tujkovic, Kamlesh Rath, Louay Jalloul, Bertrand Hochwald
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Publication number: 20090310550Abstract: A method and apparatus for link adaptation in a wireless communication network is provided. The method includes computing a first channel quality parameter based on one or more channel quality parameters. The one or more channel quality parameters are associated with a communication link between a Mobile Station (MS) and a Base Station (BS). The method further includes determining a qualifying transmission unit to compute a correction parameter. The correction parameter is computed based on the first channel quality parameter and one or more transmission parameters. The one or more transmission parameter is associated with the communication link. Thereafter, the method schedules a transmission mode of the communication link based on a second channel quality parameter. The second channel quality parameter is estimated based the first channel quality parameter and the correction parameter.Type: ApplicationFiled: June 16, 2009Publication date: December 17, 2009Inventors: Kameswara Medapalli, Djordje Tujkovic, Kamlesh Rath, Louay Jalloul, Bertrand Hochwald
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Patent number: 7545876Abstract: Systems and methods for optimizing transmission of a plurality of data streams on a multiple-input multiple-output channel are described. The systems and methods for optimizing reduce the multiple-input multiple-output channel for each transmission scheme to an equivalent single-input single-output channel for the transmission scheme and transmit the plurality of data streams based on the single-input single-output channel for the transmission scheme. Systems and methods for optimizing the transfer of data for any number of transmit and receive antennas are described.Type: GrantFiled: February 14, 2006Date of Patent: June 9, 2009Inventors: Vummintala Shashidhar, Vara J. Prasad, Ozgur Oyman, Erik Lindskog, Robert Lorenz, Kamlesh Rath
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Publication number: 20080285537Abstract: A method and system for communicating packets in a Wireless Multicast and Broadcast communication network is provided. The method includes selecting a Modulation and Coding Scheme (MCS) for transmission of a packet. The packet is then transmitted using the selected MCS on at least one of a subset of available time slots, a subset of available frequency sub-carriers and a subset of available antennas. Thereafter, it is autonomously decided whether the plurality of transmitters are to retransmit the packet. Then, the packet is retransmitted on at least one of a different subset of time slots, a different subset of frequency sub-carriers and a different subset of antennas.Type: ApplicationFiled: May 16, 2007Publication date: November 20, 2008Inventors: Kameswara Medapalli, Louay Jalloul, Kamlesh Rath
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Publication number: 20060182196Abstract: Systems and methods for optimizing transmission of a plurality of data streams on a multiple-input multiple-output channel are described. The systems and methods for optimizing reduce the multiple-input multiple-output channel for each transmission scheme to an equivalent single-input single-output channel for the transmission scheme and transmit the plurality of data streams based on the single-input single-output channel for the transmission scheme. Systems and methods for optimizing the transfer of data for any number of transmit and receive antennas are described.Type: ApplicationFiled: February 14, 2006Publication date: August 17, 2006Inventors: Vummintala Shashidhar, Vara Prasad, Ozgur Oyman, Erik Lindskog, Robert Lorenz, Kamlesh Rath
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Patent number: 7042897Abstract: A method for allocating resources of a shared medium in a large distributed network. The nodes make reservation requests in parallel during a series of reservation time slots. For each slot, one node of a pair transmits a request and the other listens. A node transmits its own requests and the requests of nodes from the request it received. The process repeats until all nodes have transmitted their requests for medium access, wherein one node knows the medium access requests of all the nodes in the network. In this fashion, 1024 nodes can make their requests in ten time slots. The last node may be a master node or may transmit to a master node or base station, which transmits a full or partial grant. Alternatively, the nodes may simultaneously transmit their requests to a master node, which passes the groups requests to a master node nearer the base station.Type: GrantFiled: April 5, 2001Date of Patent: May 9, 2006Assignee: ARCWAVE, IncInventors: Srinivas Sivaprakasam, Kamlesh Rath