Patents Examined by Charles Chow
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Patent number: 7583948Abstract: A time constant automatic adjusting circuit comprises: a filter circuit varying a phase of an clock signal to be input so as to output the clock signal; a phase comparison circuit comparing a phase of an output signal of the filter circuit with the phase of the clock signal, and outputting a predetermined voltage when the phase of the output signal and the phase of the clock signal are the same; at least three comparators comparing the output voltage with a plurality of different voltages; an up-down counter counting a number of output bits of either one of the at least three different voltages in accordance with an output result of the comparators; and a control circuit varying the time constant of the filter circuit in accordance with the number of output bits counted by the up-down counter.Type: GrantFiled: April 27, 2006Date of Patent: September 1, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Osamu Watanabe, Rui Ito, Shigehito Saigusa, Tetsuro Itakura
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Patent number: 7583702Abstract: The present invention discloses a method of transmitting a first signal and a second signal in a wideband code-division multiple access network, wherein a probability of the appearance of signal bit “1” or “0” in each signal of the first signal and the second signal is remarkably higher than a probability of the appearance of “0” or “1”, the method including: a step of determining constellation points, for determining combinations of different states of the first signal and the second signal and for determining each combination as a constellation point; a step of determining locations of constellation points, for determining a location of each constellation point on I-Q plane based on a priori knowledge of said combination; and a step of transmission, for, after modulating said different combinations in different ways according to the location of each constellation point, transporting them to a user equipment via a physical channel.Type: GrantFiled: December 7, 2005Date of Patent: September 1, 2009Assignee: Alcatel LucentInventors: Zongchuang Liang, Hua Chao, Xin Xu, Luoning Gui
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Patent number: 7580702Abstract: Systems and methods for discovering features of a communication device. The features of a communications device are tracked or monitored. Features that are unused or undiscovered are identified. The undiscovered features are then included as ticker items in an interactive ticker. When a ticker item that corresponds to an undiscovered feature is selected, the user is presented with information or a tutorial that instructs the user about the feature or how to use the feature. The undiscovered features included in the ticker can change based on how the usage of the device's features changes.Type: GrantFiled: May 13, 2005Date of Patent: August 25, 2009Assignee: Core Mobility, Inc.Inventor: Konstantin Othmer
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Patent number: 7577418Abstract: A sub-harmonic mixer and a down converter with the sub-harmonic mixer are provided. The sub-harmonic mixer includes a differential amplifying unit, a current buffer unit, and a switching unit. The differential amplifying unit is used to amplify a radio frequency (RF) signal and employs a first resonance circuit to force a leakage signal to flow to a first voltage. The current buffer unit is used to amplify the gain of an output signal of the differential amplifying unit and employs a second resonance circuit to force the leakage signal to flow to a second voltage. Finally, the switching unit switches an output signal of the current buffer unit into a base band signal.Type: GrantFiled: July 18, 2006Date of Patent: August 18, 2009Assignees: United Microelectronics Corp., National Taiwan UniversityInventors: Jen-Chung Chang, Chia-Jung Hsu, Shey-Shi Lu, Hsiao-Chin Chen, Tzu-Chao Lin
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Patent number: 7570928Abstract: A system for controlling the power output of a power amplifier includes a power amplifier through which a transmit signal having an amplitude-modulated (AM) component and a phase-modulated (PM) component is passed and amplified, the power amplifier comprising a forward path, a feedback signal comprising a portion of the output of the power amplifier, a first control loop configured to receive the feedback signal and configured to apply an amplitude modulated (AM) signal to the power amplifier and configured to control the gain of the power amplifier, a second control loop configured to receive the feedback signal and configured to correct for offsets in the forward path and to linearize the first control loop; and a third control loop configured to receive the feedback signal and configured to control the phase of the PM component of the transmit signal.Type: GrantFiled: June 29, 2007Date of Patent: August 4, 2009Assignee: Axiom Microdevices, Inc.Inventors: Rahul Magoon, Morten Damgaard, Roberto Aparicio Joo, Scott D. Kee, Ichiro Aoki
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Patent number: 7567530Abstract: Disclosed is a method of converting a communication channel in a mobile communication terminal. According to the invention, the specific absorption rate (SAR) value information according to each of the communication channels are stored and managed in the mobile communication terminal, so that a communication channel having a relatively low SAR can be assigned from a new base station when there occurs a handoff or a call processing for a call incoming/originating is performed. Like this, the newly assigned communication channel is converted into a communication channel of the terminal, thereby minimizing an effect of the electromagnetic wave influencing on the user of the terminal during the communication. In addition, the SAR value information according to each of the communication channels are stored and managed in the mobile communication terminal, so that it is possible to indicate the SAR of the current communication channel of the terminal to the user.Type: GrantFiled: December 6, 2005Date of Patent: July 28, 2009Assignee: Pantech Co., Ltd.Inventor: Jae Ho Lee
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Patent number: 7558289Abstract: Methods, apparatus, and computer programs for configuring one or more transmission parameters of a wireless client in a wireless local area network (WLAN) are provided. In some implementations, one or more real time data packets to be transmitted from a wireless communication system to N wireless clients in the WLAN may be generated (N is an integer greater than zero). Each real time data packet may contain real time data in an uncompressed format. One or more transmission parameters associated with the wireless communication system or the N wireless clients may be configured to selectively operate in both a normal transmission mode and a real time transmission mode for transmission of the one or more real time data packets between the wireless communication system and the N wireless clients.Type: GrantFiled: October 6, 2004Date of Patent: July 7, 2009Assignee: Marvell International Ltd.Inventors: Sameer Bidichandani, Paramesh Gopi
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Patent number: 7558554Abstract: Certain embodiments of the invention may be found in a method and system for antenna selection diversity with prediction. An antenna diversity system may use information that it has stored on the antenna selection process in previous frames to predict the starting receiving antenna and the starting transmission antenna for the next frame. The prediction may be based on which antennas were selected in previous frames or may be based metrics associated with performance of the antennas. Prediction may be based on a majority polling scheme of previously selected antennas in a determined number of previous frames. Prediction may also be based on a weighted sum of at least one selection metric for all antennas in a determined number of previous frames. Antenna prediction provides a significant performance improvement by reducing the processing and operational overhead in cases where a transmit or a receive antenna dominates.Type: GrantFiled: March 26, 2004Date of Patent: July 7, 2009Assignee: Broadcom CorporationInventors: Min Chuin Hoo, Rajendra Tushar Moorti
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Patent number: 7551926Abstract: Terminal-assisted selection of intermediary network for a roaming mobile terminal is disclosed. The mobile terminal determines if a local access network is associated with the mobile's home service network. If not, or if the mobile terminal cannot determine whether the local access network is associated with its home service network, the mobile terminal sends a list of intermediary service networks to the local access network. The local access network can select one of the intermediary service networks to be used in an authentication procedure between the mobile terminal the home service network.Type: GrantFiled: October 8, 2004Date of Patent: June 23, 2009Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Johan Rune
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Patent number: 7548764Abstract: Techniques are provided herein for generating multiple radiation patterns. An antenna system comprises an antenna array having one or more antennas for providing a first radiation pattern and a second radiation pattern, a transform matrix for transforming one or more inputs into one or more outputs according to a transform function, wherein the outputs of the transform matrix provide signals to the antennas with predetermined phases and magnitudes for generating the first and second radiation patterns, and a transmitter for providing a first set of signals corresponding to the first radiation pattern and a second set of signals corresponding to the second radiation pattern to inputs of the transform matrix.Type: GrantFiled: February 3, 2006Date of Patent: June 16, 2009Assignee: Cisco Technology, Inc.Inventors: Hang Jin, Brian L. Kurtz, Weidong Yang, Daniel Wee, Phil Davis, John Grabner
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Patent number: 7539473Abstract: A circuit design, method, and system for tracking VCO calibration without requiring an over-designed divider as in conventional implementation. A filter reset component is added to the inputs of the VCO. A process step is added to the calibration mechanism/process that shorts the filter nodes and thus centers the frequency of the VCO before stepping from one frequency band to the next.Type: GrantFiled: April 26, 2006Date of Patent: May 26, 2009Assignee: International Business Machines CorporationInventors: Hayden C. Cranford, Jr., Stacy J. Garvin, Vernon R. Norman
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Patent number: 7536159Abstract: In a radio including analog and digital portions, with at least one A/D Convener between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) (302) to low gain upon a determination that a wide-band power estimation exceeds a wide-band threshold. The wide-b and threshold is selected to reduce the occurrence of A/D converter saturation. If the wide-band power estimation is less than the wide-band threshold, then for each VGA (302) in the analog portion, a determination is made whether a narrow band power estimate exceeds a narrow-band threshold, corresponding to that VGA (302), plus a hysteresis value, in which case that VGA (302) is set to low gain; or whether the narrow-band energy estimate is less than the narrow-band threshold minus a hysteresis value, in which case that VGA (302) is set to high gain.Type: GrantFiled: November 14, 2003Date of Patent: May 19, 2009Assignee: NXP B.V.Inventor: Charles Razzell
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Patent number: 7522898Abstract: Embodiments of the present invention include a frequency synthesizer comprising a first plurality of dividers receiving a first signal having a first frequency and generating a first plurality of divided signals and a frequency combination network including a plurality of mixers, the frequency combination network receiving one or more of the first plurality of divided signals and generating a plurality of synthesized signals having different frequencies. The frequency combination network may further include additional dividers and multiplexers for more flexibility in synthesizing different frequencies. In one embodiment, the frequency combination network is coupled to dividers in the feedback path of a phase locked loop. The present invention is particularly advantageous for synthesizing frequencies above one (1) gigahertz.Type: GrantFiled: June 1, 2005Date of Patent: April 21, 2009Assignee: WiLinx CorporationInventors: Mohammad E Heidari, Ahmad Mirzaei, Masoud Djafari, Mike Choi, Filipp A Baron, Alireza Mehrnia, Rahim Bagheri
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Patent number: 7518994Abstract: A system and method for facilitating the efficient operation of a mobile station as it transfers from communicating via one wireless data network to another. A session control node is coupled to the mobile node in such a manner that it selectively buffers data being transmitted to the mobile node, at least while the network transfer is being executed. When the mobile node had dropped its communication session with a first wireless network and established a new communication session with a second wireless network, the buffered data is read out and transmitted to the mobile node. The session control node may be coupled with a home network associated with the mobile node or a control node may be associated with the mobile node on an ad hoc basis.Type: GrantFiled: October 8, 2004Date of Patent: April 14, 2009Assignee: Research in Motion LimitedInventors: Haining Zhang, Risvan Coskun
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Patent number: 7515925Abstract: A reader/writer of a wireless communication device transmits a carrier signal from an antenna, and if there is not response from an IC card within a preset time after transmitting the polling command, the carrier signal is temporarily controlled to an OFF state.Type: GrantFiled: December 29, 2004Date of Patent: April 7, 2009Assignee: Kabushiki Kaisha ToshibaInventor: Atsushi Nakagawa
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Patent number: 7509108Abstract: The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code sequence known to the apparatus. The apparatus downconverts the carrier signal to a baseband signal using the local oscillator. The apparatus performs a block correlation of the samples of the baseband signal with the known code sequence to generate a frequency error signal. The frequency error signal is fed back to the local oscillator to correct the frequency error.Type: GrantFiled: November 9, 2007Date of Patent: March 24, 2009Assignee: InterDigital Technology CorporationInventors: Donald M. Grieco, Aykut Bultan
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Patent number: 7505791Abstract: An antenna setting apparatus that allows a user to receive a broadcast from a desired direction easily and excellently is configured as follows: an antenna setting apparatus includes: a control unit changing the direction of a smart antenna with high sensitivity; a tuner extracting a signal; a CPU controlling the control unit, controlling the frequency of the signal extracted by the tuner and controlling the control unit to change the direction with high sensitivity; an OSD outputting an information set represented by the signal; a remote control reception unit accepting a selection; a first area of a memory storing an information set, where the information set is stored in association with the direction of the smart antenna and the frequency of the signal; and a second area of the memory storing the direction and the frequency corresponding to the information set designated by the selection.Type: GrantFiled: February 3, 2006Date of Patent: March 17, 2009Assignee: Funai Electric Co., Ltd.Inventor: Naoki Yamamoto
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Patent number: 7502638Abstract: An antenna device includes a signal-band separating circuit that is interposed between a communication antenna and a ground portion that are disposed on a circuit board. The communication antenna is connected to a communication circuit by a signal line via a signal-band separating circuit. A telecast-receiving antenna is connected to a broadcast circuit by a signal line. The signal-band separating circuit transmits signals in a frequency band for communication between the communication antenna and the communication circuit, and transmits signals in a frequency band for telecasts between the communication antenna and the ground portion. The antenna length (electrical length) of the telecast-receiving antenna is extended by adding the antenna length of the communication antenna in addition to the antenna length of the ground portion, thereby improving the antenna gain during telecast reception.Type: GrantFiled: August 10, 2006Date of Patent: March 10, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Mie Shimizu, Kazunari Kawahata
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Patent number: 7502603Abstract: Improved DC cancellation in zero-IF receivers for eliminating the DC offset that otherwise would be caused by the AC voltage on a coupling capacitor at the time of switching from AC coupling to DC coupling. The coupling capacitor normally is connected first as a high pass filter to block any DC component, and then directly coupled as a direct or DC coupler. However any AC component of voltage on the coupling capacitor at the moment of switching normally remains as a DC offset. In accordance with the invention, the component of AC voltage on a coupling capacitor is tracked, and when switched to DC coupling, the component of AC voltage on the capacitor at the time of switching is held and subtracted from the signal path, thereby canceling the DC offset component that otherwise would be caused. Alternate embodiments are disclosed, including embodiments for accelerating capacitance charging for speed-up of the method.Type: GrantFiled: June 3, 2005Date of Patent: March 10, 2009Assignee: Maxim Integrated Products, Inc.Inventor: Rishi Mohindra
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Patent number: 7496336Abstract: For a weighting circuit for adjusting a feedback control loop to an input signal of the feedback control loop the feedback control loop comprises a system under control and a device for generating a control difference signal by subtracting a weighted feedback signal from the input signal. The control difference signal is fed to the system under control which generates an output signal. The output signal is multiplied, by means of a weighting circuit by a sequence of multiplication factors for generating the weighted feedback signal. A frequency bandwidth of the feedback control loop is reduced step by step by the sequence of multiplication factors.Type: GrantFiled: October 27, 2005Date of Patent: February 24, 2009Assignee: Infineon Technologies AGInventor: Andreas Menkhoff