Patents Assigned to Broadcom Corporation
  • Publication number: 20130091392
    Abstract: A method and a system for accurately calculating the timing margin in a clock and data recovery system (CDR) is provided that utilizes a singular path environment of hardware. The method entails adding an amount of jitter within the CDR to change the receiver phase. The amount of jitter is incrementally increased until a threshold level of bit errors occur. Based on the amount of jitter needed to cause the threshold level of bit errors, timing margin can be calculated.
    Type: Application
    Filed: December 30, 2011
    Publication date: April 11, 2013
    Applicant: Broadcom Corporation
    Inventors: Magesh VALLIAPPAN, Lin Zheng, Bruce Howard Conway
  • Publication number: 20130089054
    Abstract: A method for multiple input multiple output wireless communication begins by determining protocols of wireless communication devices within a proximal region. The method continues by determining whether the protocols of the wireless communication devices within the proximal region are of a like protocol. The method continues by determining the number of transmit antennas. The method continues, when the protocols of the wireless communication devices within the proximal region are of the like protocol, formatting a preamble of a frame of the wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas.
    Type: Application
    Filed: November 30, 2012
    Publication date: April 11, 2013
    Applicant: Broadcom Corporation
    Inventor: Broadcom Corporation
  • Publication number: 20130089328
    Abstract: One embodiment provides a media access control (MAC) module facilitating operations of an Ethernet passive optical network (EPON). The MAC module includes a frame formatter configured to generate a MAC control frame. The generated MAC control frame includes at least one of: an organizationally unique identifier (OUI) field, an QUI-specific operation code (opcode) field, and a number of fields associated with the QUI-specific opcode. Transmission of the MAC control frame facilitates realization of an EPON function based on the fields associated with the QUI-specific opcode.
    Type: Application
    Filed: November 8, 2012
    Publication date: April 11, 2013
    Applicant: Broadcom Corporation
    Inventor: Broadcom Corporation
  • Publication number: 20130089000
    Abstract: A technique to identify that a station is capable of transmitting a PHY-BRP packet for use in training a directional antenna. The PHY-BRP packet is transmitted, when requested to do so, by appending the PHY-BRP packet to a BRP-Response in order to associate source and destination information to the PHY-BRP packet.
    Type: Application
    Filed: September 28, 2012
    Publication date: April 11, 2013
    Applicant: Broadcom Corporation
    Inventor: Broadcom Corporation
  • Publication number: 20130090075
    Abstract: According to one embodiment, a peak detector having extended dynamic range comprises a first differential output coupled to a supply voltage of the peak detector by a first load and coupled to ground by first and second switching devices, and a second differential output coupled to the supply voltage by a second load and coupled to ground by third and fourth switching devices. The control terminals of the first, second, third, and fourth switching devices receive a common bias voltage, and the respective first and second control terminals are configured as differential inputs of the peak detector. In some embodiments, corresponding first power terminals of the first and second switching to devices share a first common node further shared by the first differential output, and corresponding first power terminals of the third and fourth switching devices share a second common node further shared by the second differential output.
    Type: Application
    Filed: November 29, 2012
    Publication date: April 11, 2013
    Applicant: Broadcom Corporation
    Inventor: Broadcom Corporation
  • Patent number: 8416878
    Abstract: Certain aspects of a method and system for achieving space and time diversity gain are disclosed. Aspects of one method may include modifying a generalization code of at least one pilot channel, to measure signal strengths for each of a plurality of received multipath signals. A portion of the plurality of received multipath signals may be combined based on the measured signal strengths. The signal strengths of the plurality of received multipath signals may be measured on a primary pilot channel by assigning its generalization code to zero. The signal strengths of the plurality of received multipath signals on a secondary pilot channel may measured by assigning its generalization code to a non-zero value.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Louis Botha, Philip Koekemoer, Sang Hun Sung, Ning Kong
  • Patent number: 8417051
    Abstract: A system and method for emphasizing and/or de-emphasizing features in a digital image. In an embodiment of the invention, the image is processed by a series of filters, which decompose the image into a series of sub-bands. Each sub-band is then processed by an emphasis circuit. In an embodiment of the invention, the emphasis circuit is connected to an input representing a particular sub-band. Each filter, therefore, is connected to its own respective emphasis circuit. The result is a series of emphasis circuit outputs, which are then combined. The result of the combination is the processed image, containing one or more emphasized or deemphasized features. In an alternative embodiment of the invention, the sub-bands are combined in a weighted fashion. The sum of the weighted sub-bands is then applied to a single emphasis circuit. The output of the emphasis circuit, in this embodiment, is a processed image having one or more emphasized or deemphasized features.
    Type: Grant
    Filed: May 11, 2009
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventor: Gordon F. Wredenhagen
  • Patent number: 8416848
    Abstract: A video transmission system includes a transceiver module that receives a device parameter from a remote device and that transmits a video signal to the remote device, wherein the video signal is transmitted as at least one separate video layer stream chosen from, an independent video layer stream and at least one dependent video layer streams that require the independent video layer for decoding. A control module chooses the at least one separate video layer stream based on the device parameter.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Stephen E. Gordon, Sherman (Xuemin) Chen, Michael Dove, David Rosmann, Thomas J. Quigley, Jeyhan Karaoguz
  • Patent number: 8416883
    Abstract: An integrated circuit radio transceiver and method therefor includes an integrated circuit radio transceiver operable to provide specified gain levels and transmit path filter responses to correspond with a selected power spectral density mask. Changes in gain may be provided solely digital gain changes or may include analog gain module gain changes. A transmitter selects from one of at least three masks to reduce or eliminate spectral regrowth out of band to satisfy EVM requirements. Circuitry is provided to allow a transceiver to determine in advance what pre-distortion compensation settings are required for the various gain settings.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventor: Arya Reza Behzad
  • Patent number: 8416879
    Abstract: A system and method providing signal combining to support multimode communication. Various aspects of the present invention may provide a first input adapted to receive a first baseband signal corresponding to a first communication protocol. A second input may be provided, which is adapted to receive a second baseband signal corresponding to a second communication protocol. A spectral placement module may, for example, be adapted to spectrally shift the first baseband signal. For example, the spectral placement module may be adapted to spectrally shift the first baseband signal to one or more frequency bands substantially distinct from one or more frequency bands associated with the second baseband signal. The spectrally shifted first baseband signal and the second baseband signal, which may also be spectrally shifted, may then be combined to form a composite signal.
    Type: Grant
    Filed: March 15, 2006
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Arya Behzad
  • Patent number: 8418241
    Abstract: Aspects of a method and system for traffic engineering in an IPSec secured network are provided. In this regard, a node in a network may be authenticated as a trusted third party and that trusted third party may be enabled to acquire security information shared between or among a plurality of network entities. In this manner, the trusted third party may parse, access and operate on IPSec encrypted traffic communicated between or among the plurality of network entities. Shared security information may comprise one or more session keys utilized for encrypting and/or decrypting the IPSec secured traffic. The node may parse IPSec traffic and identify a flow associated with the IPsec traffic. In this manner, the node may generate and/or communicate statistics pertaining to said IPSec secured traffic based on the flow with which the traffic is associated.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventor: Uri Elzur
  • Patent number: 8417861
    Abstract: Embodiments of the present invention are directed to a wire-free data center/server. The data center/server is wire-free in the sense that communication within a data unit of the data center/server (i.e., intra-data unit), between data units of the data center/server (inter-data unit), and between the data units and the backplane of the data center/server is performed wirelessly.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza (Reza) Rofougaran, Arya Reza Behzad, Sam Ziqun Zhao, Jesus Alfonso Castaneda, Michael Boers
  • Patent number: 8416896
    Abstract: Aspects of a method and system for channel estimation in a MIMO communication system with multiple RF chains for WCDMA/HSDPA may comprise receiving a plurality of communication signals from a plurality of transmit antennas. A plurality of vectors of baseband combined channel estimates may be generated based on phase rotation of the received plurality of communication signals. A matrix of processed baseband combined channel estimates may be generated based on the generated plurality of vectors of baseband combined channel estimates. A plurality of amplitude and phase correction signals may be generated based on the generated plurality of vectors of baseband combined channel estimates. An amplitude and a phase of at least a portion of the received plurality of communication signals may be adjusted based on the generated plurality of amplitude and phase correction signals, respectively.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Mark Kent, Vinko Erceg, Uri M Landau, Peter van Rooyen
  • Patent number: 8417204
    Abstract: Aspects of a method and system for on-demand signal notching in a receiver. In this regard, signal strength measurements of a received signal may enable detection of unwanted signal component(s) and one or more filters in an on-chip receiver may be configured in response to the measurements. The filter(s) may additionally be configured based on power consumption of the filter(s). Signal measurements and/or the corresponding configuration may be performed real-time. The filter(s) may be configured such that a notch in a frequency response of the filter(s) is centered at or near the unwanted component. In this manner, the unwanted component(s) may be filtered out. The filter(s) may be configured, for example, by switching one or more filter stages and/or components into and/or out of a signal path and/or by tuning one or more variable circuit elements within the filter(s).
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran
  • Patent number: 8417810
    Abstract: A counter system and method and computer program product for managing counter systems. Counter systems management includes receiving a count event associated with a counter, updating a first stage counter value based on the count event, determining whether to eject the counter value based on a random function of the counter state, and ejecting the counter value. A counter system comprises a first stage update unit configured to accept a count event and to eject a counter. A second stage update unit may be configured to accept an ejected counter value, and includes a second counting module configured to accumulate the ejected counter value.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventor: Nicholas Horgan
  • Patent number: 8417978
    Abstract: A system and method for reducing power consumption during periods of low link utilization. A single enhanced core can be defined that enables operation of subset of parent physical layer devices (PHYs). The subset and parent PHYs can have a fundamental relationship that enables synchronous switching between them depending on the link utilization state.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Wael William Diab, Howard Baumer
  • Patent number: 8416862
    Abstract: A method for feeding back transmitter beamforming information from a receiving wireless communication device to a transmitting wireless communication device includes a receiving wireless communication device receiving a preamble sequence from the transmitting wireless device. The receiving wireless device estimates a channel response based upon the preamble sequence and then determines an estimated transmitter beamforming unitary matrix based upon the channel response and a receiver beamforming unitary matrix. The receiving wireless device then decomposes the estimated transmitter beamforming unitary matrix to produce the transmitter beamforming information and then wirelessly sends the transmitter beamforming information to the transmitting wireless device. The receiving wireless device may transform the estimated transmitter beamforming unitary matrix using a QR decomposition operation such as a Givens Rotation operation to produce the transformer beamforming information.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Carlos Aldana, Joonsuk Kim
  • Patent number: 8416895
    Abstract: A method and apparatus is disclosed to compensate for an in-phase/quadrature phase (I/Q) imbalance in a communications receiver. The communications receiver may utilize information gained from observing one or more observational interferers to adjust one or more sequence parameters, such as gain and/or phase to provide some examples. The one or more observational interferers including one or more images outside of a desired frequency band of interest. The communications receiver provides one or more sequence parameter values to allow for real-time adjustment of the sequence parameters to compensate for the I/Q imbalances.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Henrik Jensen, Hooman Darabi
  • Patent number: 8417931
    Abstract: A boot code may be segmented to allow separate and independent storage of the code segments in a manner that may enable secure system boot by autonomous fetching and assembling of the boot code by a security sub-system. The code fetching may need to be done without the main CPU running on the chip for security reasons. Because the boot code may be stored in memory devices that require special software application to account for non-contiguous storage of data and/or code, for example a NAND flash memory which would require such an application as Bad Block Management, code segments stored in areas guaranteed to be usable may enable loading remaining segment separately and independently. Each of the code segments may be validated, wherein validation of the code segments may comprise use of hardware-based signatures.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Stephane Rodgers, Andrew Dellow, Xuemin Chen, Iue-Shuenn Chen, Qiang Ye
  • Patent number: 8418252
    Abstract: A network interface device includes a security database and a security services engine. The security database is configured to store patterns corresponding to predetermined malware. The security services engine is configured to compare data to be transmitted through a network to the patterns stored in the security database, and the security database is configured to receive updated patterns from the network.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: April 9, 2013
    Assignee: Broadcom Corporation
    Inventors: Bora Akyol, Puneet Agarwal