Patents Assigned to Broadcom
  • Radio frequency local area network
    Patent number: 7917145
    Abstract: An apparatus and a method for routing data in a radio data communication system having one or more host computers, one or more intermediate base stations, and one or more RF terminals organizes the intermediate base stations into an optimal spanning-tree network to control the routing of data to and from the RF terminals and the host computer efficiently and dynamically. Communication between the host computer and the RF terminals is achieved by using the network of intermediate base stations to transmit the data.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Ronald L. Mahany, Robert C. Meier, Ronald E. Luse
  • Direct memory download in a voice data and RF integrated circuit and method for use therewith
    Patent number: 7917132
    Abstract: A voice data and RF integrated circuit (IC) includes an RF transceiver module that produces received data based on a received RF signal and that produces a transmitted RF signal based on transmit data. A memory module includes a first read only memory (ROM) segment for storing a first plurality of operational instructions, and a first random access memory (RAM) segment for storing a second plurality of operational instructions. A first processing module executes the plurality of operational instructions that include baseband processing to generate input data from the received data, and to produce the transmit data from input data. A first memory interface provides direct downloading of the second plurality of operational instructions from the external memory to the first RAM segment.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Nelson R. Sollenberger, Weidong Li
  • Method and system for estimating channel of a mobile station in a communication system
    Patent number: 7916774
    Abstract: A method of estimating a channel between a desired Mobile Station (MS) and a Base Transceiver Station (BTS) antenna of a one of a plurality of sectors of a BTS. The method includes receiving a composite signal at the BTS antenna. The composite signal comprises a desired MS signal and an interfering MS signal. Thereafter, a known desired random sequence and a known interfering random sequence is applied to pilot symbols of the composite signal, resulting in a first de-randomized signal and a second de-randomized signal. Finally, the channel estimate is obtained by weighting and summing the first de-randomized signal and second de-randomized signal.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Rajesh Raja Manakkal, Sam P. Alex, Louay Jalloul
  • Method and system for vertical filtering using window descriptors
    Patent number: 7916795
    Abstract: Herein described is a method and system of vertically filtering a graphics image such that an enhanced image is provided to a display. Filtering of the graphics image may be accomplished by using one or more window descriptors. The method may be implemented by computing a weighted average of one or more pixel intensities. The system may comprise a memory, a processor, and a graphics engine. The graphics engine may comprise a graphics blender. The graphics blender may comprise one or more multipliers and one or more adders. The processor may execute software resident in the memory, such that the one or more window descriptors may be used to compute the weighted average.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Chengfuh Jeffrey Tang, Steven (Yao-Hua) Tseng
  • System and method for enabling power applications over a single communication wire pair
    Patent number: 7915755
    Abstract: A system and method for enabling power applications over a single communication wire pair. In one embodiment, a data transformer is provided that has three separate windings. Two of the windings are tied to each other via high frequency pass DC-blocking capacitors, or another suitable element that creates an AC path while providing a DC block, such that the voltage forms on either ends of the DC-blocking capacitors and the signal is sent on the outer legs of each winding. A circuit measures the current draw (I) and injects a current proportional to, but smaller than, I into a third bias cancellation winding.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Wael William Diab, Shimon Elkayam
  • Method and system for a fast-switching phase-locked loop using a direct digital frequency synthesizer
    Patent number: 7916804
    Abstract: Aspects of a method and system for a fast-switching Phase-Locked Loop using a Direct Digital Frequency synthesizer may include generating a second signal from a first signal by: translating an inphase component of said first signal in frequency via a filtered fast-switching oscillating signal generated using at least a direct digital frequency synthesizer (DDFS), and translating a corresponding quadrature component of said first signal in frequency via a phase-shifted version of said generated filtered fast-switching oscillating signal. The inphase and quadrature components of the first signal may be multiplied with the filtered fast-switching oscillating signal and a phase-shifted version of the filtered fast-switching oscillating signal, respectively.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Method and system for auto detecting and auto switching antennas in a multi-antenna FM transmit/receive system
    Patent number: 7917115
    Abstract: Methods and systems for auto detecting and auto switching antennas in a multi-antenna FM transmit/receive system are disclosed and may include detecting when an external antenna may be coupled to an external port of the wireless device and utilizing the external antenna for transmitting and/or receiving FM signals. The decoupling of an external antenna from an external port may be detected, which may cause the FM radio transmitter/receiver to be configured to transmit and/or receive FM signals utilizing antennas internal to the wireless device. One or more test signals, which may include AC signals, may be generated within the chip for detecting whether an external antenna may be coupled to an external port. A reflected signal from an external port may be measured and compared to a prestored value corresponding to a reflection due to an open circuit at the one or more external ports of the wireless device.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Thomas Baker
  • Method for estimating frequency offset at a subscriber station receiver in a multi-carrier system
    Patent number: 7916800
    Abstract: A method and system of estimating frequency offset of a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, wherein the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols includes a plurality of pilot sub-carriers. The subscriber station selects at least one group of the plurality of pilot sub-carriers within the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Sriram Mudulodu, Louay Jalloul, Bertrand Hochwald
  • Method and system for dynamically tuning and calibrating an antenna using antenna hopping
    Patent number: 7917112
    Abstract: Methods and systems for dynamically tuning and calibrating an antenna using antenna hopping are disclosed. In this regard, in a wireless device comprising an antenna that is configurable into a plurality of configurations, determining a subset of the configurations, where each configuration of the subset enables received signal strength above a threshold for a wireless channel, may be determined. During a time interval in which the wireless device is receiving signals on the wireless channel, the antenna may be configured to sequentially utilize each configuration of the subset. During the time interval, a plurality of samples of the wireless channel may be generated, where each of the samples corresponds to a different one of the configurations of the subset. The plurality of samples may be aggregated. The aggregated samples may be processed to recover information communicated on the wireless channel.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Method and system for inverse telecine and field pairing
    Patent number: 7916784
    Abstract: Certain aspects of a method and system for inverse telecine and field pairing may comprise receiving a plurality of fields of alternating polarity. A current field may be weaved with its corresponding adjacent field of opposite polarity. A polarity change count value may be calculated based on the weaving of the current field with its corresponding adjacent field of opposite polarity. The method may determine whether to utilize a progressive scheme or an interlaced scheme to encode the received plurality of fields of alternating polarity based at least in part on the calculated polarity change count value. At least one of a top field first (TFF) scheme, a bottom field first (BFF) scheme, a top field first-repeat first field (TFF-RFF) scheme and a bottom field first-repeat first field (BFF-RFF) scheme may be chosen to pair the plurality of fields of alternating polarity.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Alexander MacInnis, Chenhui Feng
  • Method and system for a greedy user group selection with range reduction in TDD multiuser MIMO downlink transmission
    Patent number: 7917101
    Abstract: Certain aspects of a method and system for processing signals in a communication system may include maximizing system capacity for a time division duplex (TDD) multiuser multiple-input multiple-output (MIMO) downlink system, based on a single signal for a single user within a reduced search range or the single signal for the single user and at least one other signal for one other user within a remaining portion of the reduced search range. The reduced search range may be generated by sorting a plurality of signals based on a channel gain corresponding to each of the plurality of signals. The single signal for the single user may be selected from the reduced search range corresponding to a channel gain that is greater than a channel gain corresponding to a remaining portion of the reduced search range.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Chengjin Zhang, Jun Zheng, Pieter van Rooyen
  • Method and system for detecting a presence and a start of a zone in a frame
    Patent number: 7916713
    Abstract: The present invention provides methods and systems for detecting a start symbol of a second zone of a frame. One or more symbol indices corresponding to one or more symbols of the second zone of a frame are derived. One or more codes on pilot sub-carriers corresponding to the one or more symbol indices may also be derived. Based on the one or more symbol indices a set of possible start symbol indices is established. Thereafter, a frame is received comprising one or more of a preamble symbol, a first zone and the second zone. It is determined if the received frame comprises the second zone. If the second zone is present in the received frame, the start symbol index of the second zone of the received frame is determined based on the detection of one or more codes and the set of possible start symbol indices. The present invention further provides methods and systems for detecting a Nth symbol of a frame.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Sriram Mudulodu, Louay Jalloul
  • Separate power island for high performance processor that reboots to second boot sector
    Patent number: 7917790
    Abstract: Separate power island for high performance processor. A multi-processor design is presented in which each of the processors is implemented in separately powered portions of a circuitry (e.g., an integrated circuit). One of the processors can be a main application processor, and another of the processors can be a baseband processor. In addition, the each of the processors can be implemented using different types of circuitry (e.g., one of the processors [such as the main application processor] is implemented using higher performance/higher leakage circuitry that another of the processors [such as the baseband processor]). One of the processors (e.g., main application processor) can be powered down when not needed thereby providing energy/power conservation which can be vital is handheld communication device applications such as wireless handheld communication devices.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Anatoly Gelman, Kiran Puttegowda
  • Redundant radio frequency network having a roaming terminal communication protocol
    Patent number: 7916747
    Abstract: Disclosed herein is a redundant network and communication protocol at least including host computers, RF base stations, and roaming terminals. The network may utilize a polling communication protocol such that under heavy traffic conditions, a roaming terminal wishing to initiate communication may be required to wait for at least a predetermined period and determine whether the channel is available for communication. When a hidden terminal is communicating, the roaming terminal may conclude that the communication is taking place upon receiving a polling frame directed to the hidden terminal from the normally silent base station. Inherent redundancy techniques may be used with a spanning tree approach for determining the most efficient pathways from a source to a destination and ensuring that the network adapts to spatial changes or breakdowns within the network.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Robert C. Meier
  • Hierarchical data collection network supporting packetized voice communications among wireless terminals and telephones
    Patent number: 7916706
    Abstract: A packet-based, hierarchical communication system, arranged in a spanning tree configuration, is described in which wired and wireless communication networks exhibiting substantially different characteristics are employed in an overall scheme to link portable or mobile computing devices. The network accommodates real time voice transmission both through dedicated, scheduled bandwidth and through a packet-based routing within the confines and constraints of a data network. Conversion and call processing circuitry is also disclosed which enables access devices and personal computers to adapt voice information between analog voice stream and digital voice packet formats as proves necessary. Routing pathways include wireless spanning tree networks, wide area networks, telephone switching networks, internet, etc., in a manner virtually transparent to the user.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Joseph J. Kubler, Michael Morris
  • Power control techniques for wireless devices
    Patent number: 7916677
    Abstract: Various embodiments are disclosed relating to wireless systems, and also relating to power control techniques for wireless devices. One disclosed embodiment comprises a wireless receiver that includes a processing circuit. In one example embodiment, at least a portion of the processing circuit may process only a portion of an ID packet. The portion of the ID packet that is received and processed may be less than a full ID packet, which may provide power savings.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Steven D. Hall
  • Method and system for efficient rapid loss detection in a bonding system
    Patent number: 7916731
    Abstract: An apparatus, method, and computer program for efficient rapid loss detection in a channel bonding system. A received packet having a packet sequence number (PSN) not equal to a next expected PSN is queued. A channel counter for a first channel on which the received packet was received is incremented. If all channel counters are non-zero, increment the next expected PSN to equal a lowest queued packet PSN. Forward the queued packet with the lowest queued packet PSN. Decrement a channel counter for a second channel from which the lowest PSN packet is forwarded.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: David Michael Pullen
  • Method and system reducing peak to average power ratio (PAPR) in a communication network
    Patent number: 7916694
    Abstract: A method and system of transmitting a plurality of Orthogonal Frequency Division Multiple (OFDM) symbols in a block transmission system of a communication network is provided. The block transmission system is a frequency reuse system. The method includes encoding the plurality of OFDM symbols. The method further includes, modulating at least one of a phase and a magnitude of the plurality of OFDM symbols. Thereafter, a plurality of modulated OFDM symbols is converted from a digital form to an analog form. The plurality of modulated OFDM symbols corresponds to the plurality of OFDM symbols.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Arogyaswami Paulraj
  • Method and system for choice of a steering matrix (Q) for sounding in antenna selection
    Patent number: 7916807
    Abstract: Aspects of a method and system for choice of a steering matrix (Q) for sounding in antenna selection are presented. Aspects of the system may include a transmitting station that enables determination of values for a plurality of matrix elements, which are represented in a steering matrix (Q). The contents of the steering matrix may be determined based on the contents of a plurality of protocol data units (PDU). Each of the PDUs may comprise a sounding frame. One or more space-time signals may be generated based on the plurality of PDUs. One or more transmit chain signals may be generated by multiplying a vector representation, which comprises the one or more space-time signals, by the steering matrix. One or more transmit chain signals may be transmitted via transmitting antennas selected from a plurality of transmitting antennas.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventor: Carlos Aldana
  • Method and system for holistic energy management in ethernet networks
    Patent number: 7916676
    Abstract: Aspects of a method and system for holistic energy management in Ethernet networks are provided. In this regard, based on activity in one or more nodes in a network, power consumption in the network may be controlled via computational capabilities of node(s) in the network and/or via a data communication rate between nodes in the network. Activity in a network node may be determined based on deep packet inspection of traffic transmitted/received by the node, inspection of data exchanged between subsystems in the node, a state of an operating system running in the node, data processed or waiting to be processed in the node, information exchanged between an energy management entity in the node and an energy management entity in one or more other nodes, computing tasks delegated to the node, and/or instructions transmitted along with a computing task delegated to the node.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Uri Elzur, Scott Powell