Patents Examined by Charles Chow
  • Patent number: 8406720
    Abstract: Techniques are provided herein to generate beamforming weight vectors for transmissions to be made from a first wireless communication device, e.g., a base station, to a second wireless communication device, e.g., a client device. The first device has a plurality of antennas and receives uplink transmissions from the second device, each uplink transmission comprising a group of frequency subcarriers. The first device computes channel information from the received uplink transmission and computes one or more trigonometric waveforms determined to approximate the channel information. One or more downlink beamforming weight vectors are computed at any given frequency subcarrier (thus in any frequency subband) by interpolation using the one or more trigonometric waveforms.
    Type: Grant
    Filed: August 19, 2009
    Date of Patent: March 26, 2013
    Assignee: Cisco Technology, Inc.
    Inventors: Yanxin Na, Hang Jin
  • Patent number: 8385867
    Abstract: In one embodiment, a set of tracking filters to be coupled between an amplifier and a mixer is provided. The tracking filters may be differently configured depending on band of operation. For example, a first set of the filters can be configured to maintain a substantially constant Q value across their operating bandwidth while a second set of the filters can be configured to maintain a substantially constant bandwidth across their operating bandwidth.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: February 26, 2013
    Assignee: Silicon Laboratories Inc.
    Inventors: Aslamali A. Rafi, Chunyu Xin, Ruifeng Sun, Abhishek Kammula, Ramin Khoini-Poorfard, Alessandro Piovaccari, Peter J. Vancorenland
  • Patent number: 8380143
    Abstract: An embodiment of the invention is a time-delay invariant predistortion approach to linearize power amplifiers in wireless RF transmitters. The predistortion architecture is based on the stored-compensation or memory-compensation principle by using a combined time-delay addressing method, and therefore, the architecture has an intrinsic, self-calibrating time-delay compensation function. The predistortion architecture only uses a lookup table to conduct both the correction of non-linear responses of a power amplifier and the compensation of any time-delay effects presented in the same system. Due to the time-delay invariant characteristic, the predistortion design has a wider dynamic range processing advantage for wireless RF signals, and therefore can be implemented in multi-carrier and multi-channel wireless systems.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: February 19, 2013
    Assignee: Dali Systems Co. Ltd
    Inventors: Dali Yang, Jia Yang
  • Patent number: 8369873
    Abstract: Methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver which is coupled to a communication receiver or transceiver. In one exemplary method, a change in a communication signal received by the communication receiver is determined. A parameter, based on the change, is determined, and SPS signals from SPS satellites are processed according to the parameter. According to further details of this method, the change involves the fluctuation of the level of the communication signal and the parameter is a motion information which specifies a frequency range for searching for SPS signals in the process of acquiring the SPS signals from SPS satellites. In an alternative embodiment the change in the communication signal is a change in the transmitted signal in response to power control commands. Apparatuses, such as a mobile communication system which includes an SPS receiver and a communication receiver, are also described.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: February 5, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Norman F. Krasner
  • Patent number: 8351845
    Abstract: A data receiving and recording method and data receiver are provided for receiving data coded by a predetermined method and copyright information attached to the data. While recording the received data on a predetermined recording medium, the copyright information is recorded into a predetermined area of the recording medium. Preferably, the data consists of audio data of the song, lyrics data of the song and image data relating to the song and the copyright information is allotted respectively to the audio data, lyrics data and image data.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: January 8, 2013
    Assignee: Sony Corporation
    Inventors: Shintaro Tsutsui, Susumu Nagano, Yasushi Katayama
  • Patent number: 8331893
    Abstract: A receiver has an input stage (LNA) that comprises, in a signal direction from an input (SI) to an output (SO), an input transistor (Q1) and an attenuator (D1, D2, R7-R12, C2-C5). The attenuator provides an attenuation that depends on a control signal (VDC). The input stage comprises a transistor-biasing circuit (R2) that biases the input transistor in dependence on the control signal.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: December 11, 2012
    Assignee: NXP B.V.
    Inventor: Efthimios Tsilioukas
  • Patent number: 8326238
    Abstract: An embodiment of the invention is a system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device and including use of a power amplifier having nonlinear characteristics. The system includes memory for storing digitally-indexed information. The digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated. The system further includes first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory, and second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: December 4, 2012
    Assignee: Dali Systems Co, Ltd.
    Inventors: Dali Yang, Jia Yang
  • Patent number: 8306491
    Abstract: In one embodiment, the present invention includes a method for determining if a frequency control instruction would cause a first capacitor bank to reach a limit and adjusting the first capacitor bank in a first direction using a calibration value and adjusting a second capacitor bank in a second direction if the first capacitor bank would reach the limit. Furthermore, the calibration value may be calculated and stored in accordance with other embodiments. In such manner, small changes in capacitance and correspondingly small changes in frequency may be effected.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: November 6, 2012
    Assignee: Silicon Laboratories Inc.
    Inventors: Lawrence Der, Dana Taipale, Scott Willingham
  • Patent number: 8265584
    Abstract: According to one embodiment, a method for updating filter values of an image canceller is provided. The method may include determining a channel-to-image (C/I) ratio between a channel signal and an image signal at the canceller input and generating a gain control value based at least in part on the C/I ratio. Then correlations between the channel signal and the image signal at the canceller's input and output can be generated, along with a gear control value based at least in part on a ratio between the correlations. In turn, one or more filters of the canceller can be updated using the control values.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: September 11, 2012
    Assignee: Silicon Laboratories Inc.
    Inventors: John Khoury, Mitch Reid, Majid Barazande-Pour
  • Patent number: 8260237
    Abstract: A LNB (Low Noise Block Down Converter) having indication function (30A) includes a supporting stage (38), a micro-controller (34), an indication unit (36) and an LNB unit (32). The micro-controller (34) is electrically connected to the indication unit (36) and the LNB unit (32). The micro-controller (34), the indication unit (36) and the LNB unit (32) are installed on the supporting stage (38). The micro-controller (34) sends an indication signal (S2) associated with satellite signal (S1) reception quality from a specific satellite (10) for driving said indication unit (36). A user (40B) at the LNB unit (32) end is allowed to understand the satellite signal (S1) reception status of the specific satellite (10) via the indication signal (S2) sent by the micro-controller (34).
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: September 4, 2012
    Inventors: Michael Rosenbusch, Martin Josef Beck
  • Patent number: 8260199
    Abstract: One embodiment of the invention comprises a functional module for storing and exchanging data, comprising a common portable support, at least one passive contactless integrated circuit in the form of a first semi-conductor chip, a contactless integrated circuit reader in the form of a second semi-conductor chip, the contactless integrated circuit and the reader being gathered on or in the common portable support, an antenna coil of the contactless integrated circuit, connected to the contactless integrated circuit, an antenna coil of the reader, connected to the reader, the antenna coil of the contactless integrated circuit being coupled to the antenna coil of the reader.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: September 4, 2012
    Inventor: Jacek Kowalski
  • Patent number: 8249544
    Abstract: A directional coupler with a high coupling per unit area and small variations in characteristic at manufacturing capable of achieving a high directivity easily and an RF circuit module provided with the directional coupler are achieved. A main-line is provided on a front surface of a multi-layer substrate, a ground plane is provided on a back surface of the multi-layer substrate. On an inner layer immediately under the main-line, two lines in parallel with the main-line are provided, and one line is provided on a layer closer to the ground plane than the two lines. By connecting the two lines and the one line with vias, a sub-line with a shape of a winding of a loop is formed. In the sub-line, a main component of a vector vertically penetrating the loop is horizontal with respect to the ground plane.
    Type: Grant
    Filed: July 26, 2007
    Date of Patent: August 21, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Hiroshi Okabe
  • Patent number: 8244202
    Abstract: A multiband receiver is disclosed for receiving a multiband RF signal having first and second RF bands. The first RF band contains a first service RF range, and the second RF band contains a second service RF range. The receiver includes a mixer for converting the RF signal into an IF signal, using a single local oscillator frequency “f,” and an IF bandpass filter for canceling out some of frequencies of the IF signal outside of a predetermined passband. The local oscillator frequency “f” is determined to allow the first and second service IF ranges to lie outside of the predetermined passband, and to allow a frequency portion of the first IF band exclusive of the first service IF range and a frequency portion of the second IF band exclusive of the second service IF range to lie within the predetermined passband.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: August 14, 2012
    Assignee: KDDI Corporation
    Inventor: Toru Kitayabu
  • Patent number: 8244200
    Abstract: The disclosure provides a system, circuit and method for activating an electronic device from a low power state. The circuit comprises: a microprocessor; a first accelerometer; a second accelerometer which is activated upon receiving a movement signal from the first accelerometer, indicating a movement of the electronic device; a threshold circuit connected to an output of the second accelerometer to allow only signals generated by the second accelerometer that exceed a threshold to pass; an input device; and a monitoring circuit connected to the input device and an output of the threshold circuit. The monitoring circuit comprises a latch circuit utilizing signals from the threshold circuit and a reset signal from the microprocessor to generate a trigger signal to activate the input device. The monitoring circuit selectively generates an activation signal to activate the electronic device to a higher power state utilizing a notable signal received from the input device.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: August 14, 2012
    Assignee: Research In Motion Limited
    Inventors: Kevin Orr, Steven Fyke, David Mak-Fan
  • Patent number: 8233873
    Abstract: A signal processing device is provided, the device having a signal input for receiving a signal conveyed over a channel and defining a received signal. The device further includes one or more filters for generating a signal response based upon the received signal. The signal response includes an estimated value of a correntropy statistic. Additionally, the device includes a decision module connected to at least one of the filters for probabilistically deciding whether the received signal contains an information signal component based upon the estimated value of the correntropy statistic. The device further includes a signal output to convey a signal output indicating the received signal corresponds to a known signal template if the decision module decides that the received signal contains the information signal component.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: July 31, 2012
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: Jose C. Principe, Rati Agrawal, Puskal P. Pokharel
  • Patent number: 8200169
    Abstract: The present invention has an object of providing a transmitter apparatus, a mobile communication system, a base station and a communication enable signal transmitter unit, which can prioritize communications of a mobile station in a priority communication system over communications of a mobile station in a non-priority communication system, in a network where the priority communication system and the non-priority communication system coexist in the same communication area.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: June 12, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiromasa Fujii, Junichiro Hagiwara, Hitoshi Yoshino
  • Patent number: 8195096
    Abstract: The instant invention relates to an apparatus and method for enhancing DC offset correction speed of a radio device. On the exemplary, the apparatus includes one or two-stage signal-processing units and a controller. Each signal-processing unit has a baseband filter, a gain stage and a DC offset correction (DCOC) loop applied on the gain stage. A connection direction of an electrode terminal of a capacitor of the baseband filter is capable of being switched by the controller to process a pre-charge or a discharge phases thereby adjusting a bandwidth of the baseband filter to be either a normal operational bandwidth or wider than the normal operational bandwidth for rapidly setting time of the baseband filter.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: June 5, 2012
    Assignee: Mediatek Inc.
    Inventors: Chinq-shiun Chiu, Shou-tsung Wang
  • Patent number: 8180352
    Abstract: In a particular embodiment of the present invention, a particular node in an ad hoc network is configured with a desirable number of neighbor nodes and equipped with a transmission power level hierarchy. The particular node may adjust a transmission power level to a different level in the transmission power level hierarchy, based on a number of responses received from neighbor nodes after the particular node broadcasts a request at current transmission power level. This adjustment process is repeated until the particular node acquires a desirable number of neighbor nodes.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: May 15, 2012
    Assignee: Oracle America, Inc.
    Inventors: Erik Nordmark, Samita Chakrabarti
  • Patent number: 8175562
    Abstract: An apparatus including automatic gain control (AGC) includes at least one variable gain amplifier (VGA) operative to receive an input signal and to generate an amplified signal. A gain of the VGA is controlled as a function of at least a first control signal. The apparatus further includes an AGC circuit coupled to the VGA and being operative to generate the first control signal. The AGC circuit has a bandwidth that is controlled as a function of at least the amplified signal and a second control signal, the second control signal being indicative of a motion of the apparatus.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: May 8, 2012
    Assignee: Agere Systems Inc.
    Inventors: Roger A. Fratti, Xiao-an Wang
  • Patent number: 8155609
    Abstract: The present invention relates to a combination RF tuner capable of receiving signals from the FM radio band and from the TV band. Prior art combination tuners had to compromise in quality resulting in combination tuners that neither exhibited high-end FM nor TV-signal reception behavior. A combination RF tuner capable of optimal receiving an FM-radio signal type and a TV signal type, comprising a switch-able tuned input filter (440), is proposed. One response of the input filter (440) provides a sufficient big bandwidth for enabling reception of the TV-signal type. The input filter (440) of the invention can be switched, providing a second response that has a smaller bandwidth for enabling reception of the FM-radio signal type. The second response can be realized by substantially bypassing an 10 inductive element (450) (e.g., comprising a inductor, L21, in series with a damping resistor, R3) of the input filter (440).
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: April 10, 2012
    Assignee: NXP B.V.
    Inventors: Yeow T. Toh, Kam C. Kwong