By Signal Quality (e.g., Noise) Patents (Class 455/277.2)
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Patent number: 7711335Abstract: A receiver for receiving and processing digital satellite radio signals includes multiple antenna modules for receiving digital satellite radio signals, multiple processing circuits for converting digital satellite radio signals to low-IF or 0-IF signals, diversity circuitry for selecting from among multiple low-IF or 0-IF signals, and additional processing circuitry for extracting audio and/or data from the selected signals. The system also includes automatic and manual switches for selecting from among multiple antennas, and for reducing power consumption of antenna and processing circuitry.Type: GrantFiled: June 1, 2006Date of Patent: May 4, 2010Assignee: Delphi Technologies, Inc.Inventors: Daniel G. Morris, Frank M. Hirschenberger, Pierre L. Wassom
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Patent number: 7683757Abstract: A system and method for remotely controlling a function. The system includes a transmitter and a receiver control circuit having a plurality of antennas. The transmitter transmits a wireless control signal having first and second signal portions. An antenna is selected based on the first signal portion. A function is performed when the second signal portion is received by the selected antenna and successfully decoded.Type: GrantFiled: October 18, 2005Date of Patent: March 23, 2010Assignee: Lear CorporationInventors: Ronald O. King, Art Turovsky, Tom Q. Tang
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Patent number: 7675577Abstract: A device and method for automatically changing a broadcast channel of a vehicle television with a diversity antenna is provided. The device includes an antenna switching unit connected with the diversity antennas and switching one of the diversity antennas; an image signal level detector for detecting an image signal level; an audio signal level detector for detecting an audio signal level; a storage unit for storing regional broadcast channel information, a channel change history, a value of number of switching times; and a controller for controlling the antenna switching unit, counting and storing the number of switching times, checking a quality of the broadcast signal, deciding a desired broadcast channel, and controlling the tuner to change into the decided broadcast channel.Type: GrantFiled: March 23, 2006Date of Patent: March 9, 2010Assignee: Hyundai Autonet Co., Ltd.Inventor: Hyun Po Yang
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Patent number: 7660559Abstract: Methods and devices related to wireless networking. A wireless device has multiple directional antennas and multiple backhaul radio modules which provide point to point wireless links with other wireless devices. Each radio module can use any one of the available directional antennas to link to one other routing device. Antennas are automatically selected for each wireless device by merely setting one device in a “hunt” mode and setting another device in a “listen” mode. Devices in a hunt mode cycle through the available antennas by sequentially transmitting transmit messages to devices in the listen mode using each of the available antennas in turn. Devices in the listen mode also cycle through their available antennas by sequentially “listening” for transmit messages. A listen mode device, receives transmit messages on each of its available antennas, and, after gathering the relevant data, determines which of its antennas is best suited for communicating with the hunt mode device.Type: GrantFiled: December 11, 2006Date of Patent: February 9, 2010Assignee: Belair Networks Inc.Inventors: Bernard Herscovich, Stephen G. Rayment, Roland A. Smith
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Patent number: 7660568Abstract: An apparatus and a method for generating a channel estimate using a non-pilot signal. More specifically, there is provided a receiver comprising a device configured to receive a transmitted signal having a pilot portion and non-pilot portion and a channel estimator configured to calculate a channel estimate based on the non-pilot portion of the transmitted signal and to send the channel estimate to the device. A method for implementing the improvement is also provided.Type: GrantFiled: September 27, 2004Date of Patent: February 9, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Naresh Sharma, Alexei Ashikhmin
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Patent number: 7657244Abstract: An antenna selection technique (transmitter/receiver antenna selection) that reduces the cost of the MIMO system while maintaining high performance. A combined selection algorithm for MIMO-OFDM is provided which offers the best tradeoff between spatial correlation and instantaneous SNR. In one case, antenna selection is based on instant channel information. In another case antenna is based on statistical channel state information. In another case, antenna selection is based on a hybrid of instant channel state information and statistical channel state information.Type: GrantFiled: October 27, 2005Date of Patent: February 2, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Huaning Niu, Chiu Ngo
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Publication number: 20100003934Abstract: A method is provided for receiving a signal, corresponding to a data signal transmitted by a transmitter to a receiver via a transmission channel. The method includes the following steps: analyzing the signal received, delivering an information item representative of the transmission channel; determining, periodically and/or as a function of a variation of the transmission channel: at least one distribution of the transmission antennas into at least one group of at least one antenna as a function of the information item representative of the transmission channel, wherein at least one group includes at least two transmission antennas for at least one of the determinations; and specific efficiencies assigned respectively to each of the groups of antennas for each distribution as a function of the information item, and transmitting to the transmitter a parameterization signal defining the at least one distribution and the specific efficiencies.Type: ApplicationFiled: September 13, 2007Publication date: January 7, 2010Applicant: France TelecomInventors: Raphael Visoz, Patricia Layec, Antoine Berthet
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Patent number: 7643813Abstract: A diversity switch combiner for use in systems for receiving multi-carrier wideband signals is arranged to determine, during a guard interval, which antenna provides the strongest carrier, for each of a plurality of carrier frequencies. A switch is then operated to select, for the subsequent symbol, that antenna which provides the greatest number of strongest carriers.Type: GrantFiled: November 10, 2004Date of Patent: January 5, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Simon R. Saunders, Stephen Michael Leach
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Publication number: 20090323872Abstract: Methods and apparatus are presented for a digital radio receiver using antenna to receive a signal or signals using at least one other method of diversity. In exemplary embodiments of the present invention, both switched antenna diversity and at least one other method of diversity can be utilized in a digital radio broadcast system. In exemplary embodiments of the present invention the timing of an antenna control signal in a receiver can be synchronized so that switchover to a different receiving antenna can occur between adjacent blocks of data being received from whichever of the other diversity sources is then, on average, providing the better reception. For digitally coded transmissions, a clock signal can be provided by a signal processor so as to trigger a diversity controller to switch at an optimum switching time, such as, for example, between groups or “blocks” of digitally encoded information, thus eliminating or minimizing disruption of a contiguous data stream.Type: ApplicationFiled: June 30, 2009Publication date: December 31, 2009Applicant: Sirius XM Radio Inc.Inventor: Nick Haller
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Patent number: 7639991Abstract: A mobile phone includes a controller; a receipt adjusting unit for controlling receipt of the (RF) radio frequency signal and controlling receipt diversity under control of the controller; a first RF signal receiver for converting the RF signal received through the first antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a second RF signal receiver for converting the RF signal received through the second antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a transmission diversity adjusting unit for controlling transmission diversity under control of the controller; and an RF signal transmitter for converting the baseband signal transmitted from the controller into an RF signal to be transmitted to the first antenna and transmitting the RF signal to the second antenna under control of the transmission diversity adjusting unit.Type: GrantFiled: January 13, 2006Date of Patent: December 29, 2009Assignees: Pantech Co., Ltd., SK Telecom Co., Ltd.Inventors: In Kwang Kim, Hong Woo Lee
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Patent number: 7636561Abstract: A diversity switch combiner for use in systems for receiving wideband signals is arranged to split the received signal into separate channels each carrying a respective frequency band. Respective switch means are provided for each channel in order to switch the input of each channel between different antennas. A switch control determines the switch setting in accordance with the result of a comparison operation, preferably performed during a guard period, in which the signal qualities for different settings are compared.Type: GrantFiled: November 10, 2004Date of Patent: December 22, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Simon R. Saunders, Stephen Michael Leach
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Patent number: 7633442Abstract: A satellite communication subscriber device includes a smart antenna for generating antenna beams for receiving signals from at least one satellite, and a receiver. The receiver includes a quality metric module for calculating a quality metric on the signals received by each antenna beam. A beam selector is coupled to the smart antenna for selecting the antenna beams. An antenna steering algorithm module runs an antenna steering algorithm for operating the beam selector for scanning the antenna beams, receiving the calculated quality metrics from the receiver for each scanned antenna beam, and comparing the calculated quality metrics. The algorithm selects one of the scanned antenna beams based upon the comparing for continuing to receive signals from the at least one satellite.Type: GrantFiled: June 2, 2005Date of Patent: December 15, 2009Assignee: InterDigital Technology CorporationInventors: Bing A. Chiang, Inhyok Cha, Michael J. Lynch, Thomas E. Gorsuch
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Patent number: 7630695Abstract: A system and method are provided for measuring the amplitude of a received signal. The method receives an analog input signal, and compares a peak value of the analog input signal to a threshold level. Threshold transition data is generated, and the threshold level is adjusted in response to the transition data. The above-mentioned processes of comparing, generating, and adjusting are reiterated until the threshold level is about equal to the analog input signal peak value. As a result, a measurement of the analog input signal peak value is supplied. In one aspect, threshold transition data is converted into a digital value. Then, the measurement of the analog input signal peak value uses the digital value to represent the analog input signal peak value. Further, the digital value is converted into an analog voltage as feedback, and the analog voltage is used as the threshold level.Type: GrantFiled: April 12, 2007Date of Patent: December 8, 2009Assignee: Applied Micro Circuits CorporationInventors: Julian Uribe, Wei Fu
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Patent number: 7630699Abstract: The invention relates to systems and methods which may allow the determination of a correction factor between full scale antennas and scale antennas in order to determine the coupling loss of the full scale antennas on full scale structures based on models of the full scale structures.Type: GrantFiled: December 19, 2006Date of Patent: December 8, 2009Assignee: The Boeing CompanyInventor: Vincent Mancuso
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Patent number: 7627301Abstract: The invention relates to a spatial diversity receiving device and an input channel switching method. The device comprises a main control circuit and at least one receiving channel including a RF selective switch, wherein the circuit controls the switch, so as to select one of the plurality of input signals from the plurality of antennae and send that signal to a receiving module. The module comprises a RSSI unit for outputting a RSSI value and sends the value to the circuit. On basis of a real time analysis to the receiving signal, the circuit selects a predetermined occasion to perform a compulsive switching and dynamically selects the antenna with a stronger signal so that the generation of error code due to transient interference may be reduced. The system exhibits an excellent resistance to wireless signal fading, and has a simple structure as well as a low cost and power consumption.Type: GrantFiled: December 8, 2006Date of Patent: December 1, 2009Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd.Inventors: Saixin Zhou, Liusi Ye, Hong Chen, Yunhui She, Fang Liu, Yueping Zuo
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Patent number: 7623836Abstract: Antenna selection is performed in a multicarrier communication system based on antenna scores. In at least one embodiment, an antenna score is calculated for an antenna by determining grades for individual carriers associated with the antenna based on corresponding signal magnitude related parameters and then combining the grades in a predetermined fashion.Type: GrantFiled: June 19, 2003Date of Patent: November 24, 2009Assignee: Intel CorporationInventor: Yuval Finkelstein
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Publication number: 20090286498Abstract: Disclosed is an antenna diversity receiver comprising an antenna switching control unit that includes a noise extraction unit that extracts noise from an FM detection output, a comparator that detects multipath interference from the extracted noise, a switching signal generation unit that outputs, to an antenna switching unit, an antenna switching signal directing switching from one antenna presently in use to another antenna, when multipath interference is detected, a modulation factor detection unit that obtains a modulation factor from the FM detection output, an over-modulation decision unit that decides whether or not the modulation factor is for over-modulation, and a sensitivity setting unit that, when it is decided that there is over-modulation, changes a multipath detection threshold for detecting multipath interference in the comparator, and performs setting to decrease sensitivity of detection of the multipath interference.Type: ApplicationFiled: May 18, 2009Publication date: November 19, 2009Inventor: Satoshi KATAYANAGI
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Publication number: 20090270059Abstract: A receiver system and method for receiving signals are provided, wherein the system includes a plurality of antenna elements configured to receive a transmitted signal. A receiver device is in communication with the plurality of antenna elements, wherein the receiver device is configured to emit an output based upon the received signal, and communicate a control signal that corresponds to a determined signal quality of the received signal. A switch device is adapted to switch among the plurality of antenna elements to electrically connect a selected antenna element of the plurality of antenna elements to the receiver device. A controller is in communication with the receiver device, such that the controller receives the control signal, wherein the controller commands the switch device to directly switch to any of the antenna elements to electrically connect one of the plurality of antenna elements to the receiver device based upon the control signal.Type: ApplicationFiled: April 28, 2008Publication date: October 29, 2009Inventors: Nazar F. Bally, Daniel G. Morris, Raed S. Shatara, Steven S. Langston
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Publication number: 20090252204Abstract: A receiver system and method thereof are provided, wherein the receiver system includes a plurality of antenna elements, a receiver device, and a switching system. The antenna elements are configured to receive a signal including first and second antenna elements. The receiver device is in communication with the first and second antenna elements. The switching system switches between the antenna elements using a first switching device, to electrically connect the receiver device when a digital signal is available, and the digital signal received by the first antenna element has a greater signal quality than the digital signal received by other antenna elements. The switching system also switches among the antenna elements to electrically connect the receiver device and the first antenna element to receive the analog signal using a second switching device when the digital signal is unavailable.Type: ApplicationFiled: April 4, 2008Publication date: October 8, 2009Applicant: DELPHI TECHNOLOGIES, INC.Inventors: Raed S. Shatara, Matthew J. Yarosz
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Publication number: 20090253456Abstract: A portable dual band receiver (D), intended for equipping a mobile equipment, comprises a first antenna (AN1), a second antenna (AN2), a two-states switching means (SW) connected to the first (AN1) and second (AN2) antennas and arranged to deliver either first signals comprised into a first band when it is set into a first state or second signals comprised into a second band when it is set into a second state, at least one low noise amplifier (A1, A2) arranged to amplify the signals delivered by the switching means (SW), a processing means (PM) arranged to process the signals outputted by the low noise amplifier(s) (A1,A2) either in a first mode or in a second mode, and a control means (CM) arranged, when the processing means (PM) works in the second mode, to determine which of the first (AN1) and second (AN2) antennas induces the best reception quality into the processing means (PM), and to set the switching means (SW) in the state which allows it to deliver the signals received by the antenna that it has deType: ApplicationFiled: June 12, 2007Publication date: October 8, 2009Applicant: NXP B.V.Inventors: Yeow Teng Toh, Kam Choon Kwong
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Patent number: 7590399Abstract: A technique for reducing multipath distortion in an FM receiver, with a plurality of switchable antennas, provides a fast distortion detector that monitors a received signal for significant distortion events of less than about 15 microseconds in duration. In response to a multipath event, the output of the fast distortion detector initiates a search for a lower distortion (better quality) antenna. To prevent frequent antenna searches from causing an audible disturbance, a threshold is introduced to desensitize the fast distortion detector. Threshold decay is a function of an overall received RF signal level. A slow distortion detector is also provided that measures distortions of the received signal relating to signal quality.Type: GrantFiled: August 11, 2005Date of Patent: September 15, 2009Assignee: Delphi Technologies, Inc.Inventors: Raed S. Shatara, Mathew A. Boytim, Steven S. Langston
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Patent number: 7580674Abstract: An antenna control interface is integrated with common integrated circuit components, such as radio transceiver or baseband modem signal processing control logic. The antenna control interface controls the operation of an adaptive antenna array used with wireless communication system devices.Type: GrantFiled: March 3, 2003Date of Patent: August 25, 2009Assignee: IPR Licensing, Inc.Inventors: Thomas E. Gorsuch, John A. Regnier, John E. Hoffmann, George Rodney Nelson, Jr., James A. Proctor, Jr.
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Patent number: 7570949Abstract: A shipboard communications system for providing RF communications between a ship and a communications satellite includes a modem, an antenna selector switch coupled to the modem and to a pair of directional antennas, a programmable controller for each antenna, and an antenna selector logic (ASL) circuit coupled to each antenna's programmable controller responsive to the programmable controller whereby an antenna handoff occurs when an on-service antenna is moving into a blockage zone and does not occur only when an off-service antenna is coming out of blockage.Type: GrantFiled: April 17, 2006Date of Patent: August 4, 2009Assignee: The United States of America as represented by the Secretary of the NavyInventor: David J Minerath
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Patent number: 7565172Abstract: An adaptive antenna receiver whose follow-up performance is improved with respect to the angle change of the arrival direction of a desired signal. An antenna weight adaptive update section (11-1) adaptively updates the antenna weight according to a signals received by each antenna element and an error signal obtained from a desired signal corrected based on transmission channel estimation. An antenna weight direction constraint section (12-1) performs the constraint process for the antenna weight obtained by the antenna weight adaptive update section (11-1) to maintain the beam gain constant in the arrival direction of the desired signal. A beamformer (2-1) receives the desired signal through an array antenna using the antenna weight which has undergone the constraint process performed by the antenna weight direction constraint section (12-1).Type: GrantFiled: June 23, 2004Date of Patent: July 21, 2009Assignee: NEC CorporationInventor: Shousei Yoshida
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Publication number: 20090175383Abstract: A method and apparatus for wirelessly transmitting real-time data streams is described. To ensure continuous data flow, fast diversity and slow diversity can be used. Fast diversity chooses a receive antenna based on received signal parameters, such as signal strength, during the transmission header and prior to information transfer. Slow diversity stores received signal parameters from previous packets, associates the parameters with a selected antenna, and uses the parameter history to denote a “default” antenna. Additionally, receive and/or transmit beam forming can be used to maintain continuous communication between stations. Beam forming, which combines antenna signals to maximize performance, is possible when at least two transmit/receive signal processing chains are available.Type: ApplicationFiled: March 16, 2009Publication date: July 9, 2009Inventors: James Cho, Paul J. Husted
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Patent number: 7558553Abstract: Systems and methods for advanced signaling between stages of transmitters and/or receivers in a digital communication system. One or more intermediate frequency signals and one or more control signals may share the same cable. Also, systems and methods are provided for calibrating head end receiver gain to improve subscriber unit power control loop performance.Type: GrantFiled: December 21, 2000Date of Patent: July 7, 2009Assignee: Cisco Technology, Inc.Inventors: Alireza Raissinia, Gregory Taylor, Gregory Raleigh, Michael Pollack, Vincent K. Jones, IV
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Patent number: 7555277Abstract: A reception system for motor vehicles having a diversity antenna system with a plurality of antennas and an antenna switch coupled to a receiver for the reception of digital, MPSK-modulated satellite and terrestrially broadcast radio signals containing phrase reference signals. The antenna diversity system optionally switches through at least one of two available antennas and has a signal level testing device with its input coupled to the receiver and its output coupled to the antenna switch. This is to provide an indication for the need for antenna switching to avoid signal loss by means of a signal at its output, whereby the phase reference signals occur repeatedly in a time sequence.Type: GrantFiled: February 13, 2006Date of Patent: June 30, 2009Assignee: Delphi Delco Electronics Europe GmbHInventors: Heinz Lindenmeier, Stefan Lindenmeier
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Publication number: 20090149146Abstract: A method of receiving an RF signal in a wireless communication device includes receiving (1002) a signal having a frequency greater than 10 gigahertz by at least two of a plurality of millimeter wave antennas (122, 124, 126, 128, 822, 824, 826, 828, 922, 924, 926, 928) positioned within the portable wireless communication device. A characteristic of the signal at each antenna (122, 124, 126, 128, 822, 824, 826, 828, 922, 924, 926, 928) is determined (1004) and at least one of the plurality of millimeter wave antennas (122, 124, 126, 128, 822, 824, 826, 828, 922, 924, 926, 928) is selected (1006) based on the characteristics. The signal from the selected millimeter wave antenna (122, 124, 126, 128, 822, 824, 826, 828, 922, 924, 926, 928) is forwarded (1008) to a device controller 104. A combination of signals from the plurality of antennas may be evaluated prior to selecting two or more of the antennas (122, 124, 126, 128, 822, 824, 826, 828, 922, 924, 926, 928).Type: ApplicationFiled: December 5, 2007Publication date: June 11, 2009Applicant: MOTOROLA, INC.Inventors: Rudy Emrick, Bruce Bosco
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Patent number: 7546104Abstract: The invention arranges an auxiliary antenna in the neighborhood of an antenna, and a voltage applied to the auxiliary antenna is changed based on the reception quality of a received signal received by the antenna. Thereby, the reception characteristic of the antenna is changed. Moreover, the optimum antenna is selected among a plurality of arranged antennas based on the reception quality of the received signals received by the plurality of arranged antennas.Type: GrantFiled: December 1, 2005Date of Patent: June 9, 2009Assignee: Casio Computer Co., Ltd.Inventors: Yoshihito Kitayama, Kunio Okada
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Patent number: 7542750Abstract: This invention provides a diversity system with identification and evaluation of antenna properties. The application also provides a method for selecting an external receiving broadcast diversity antenna. The invention makes a selection of one of the diversity antennas as efficient as possible and is able to adapt the solution found to a variety of practical situations that may arise regarding diversity reception in a vehicle. This may be accomplished by the antenna characteristics being detected and antenna selection made based on the antenna characteristics. Thus, the best reception signal will be automatically selected by the mobile broadcast receiver without human intervention or prolonged waiting time.Type: GrantFiled: June 17, 2005Date of Patent: June 2, 2009Assignee: Harman Becker Automotive Systems GmbHInventor: Michael Zahm
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Patent number: 7539517Abstract: A wireless headphone assembly has left and right speakers attached to ends of a headphone body, and at least two antennas, e.g., one located at each speaker. Reception can be improved by selecting a “best” one of the antennas based on a quality metric.Type: GrantFiled: April 17, 2006Date of Patent: May 26, 2009Assignees: Sony Corporation, Sony Electronics Inc.Inventors: Andrew Xavier Estrada, Shouichi Isogai
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Patent number: 7536158Abstract: A method and apparatus derives an impairment correlation matrix to process signals received at a wireless receiver over multiple paths of a multi-path channel. The receiver includes first and second impairment correlation estimators for estimating first and second impairment correlation matrices based on despread symbols received over multiple paths of a multi-path channel. The receiver then derives the impairment correlation matrix based on the estimated first and second impairment correlation matrices. The receiver may combine traffic despread values to suppress interference using weighting factors calculated based on the derived impairment correlation matrix. Further, the receiver may estimate a signal-to-interference ratio based on the derived impairment correlation matrix.Type: GrantFiled: March 29, 2004Date of Patent: May 19, 2009Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Gregory E. Bottomley, Ali S. Khayrallah
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Patent number: 7532595Abstract: A mobile terminal includes a channel estimation processor to obtain the channel estimation value of a first channel reception signal in use of a plurality of known signals received from a base station within a channel estimation period; a channel compensation processor to perform a compensation process of the first channel reception signal in use of the channel estimation value; and a controller to control the channel estimation period so as to use a known signal which is received after the reception of the first channel reception signal for channel compensation. With this, throughput in downlink communication can be improved by controlling the deterioration of HS-SCCH reception quality itself without any particular transmission power control with the base station even under an environment such as high speed fading.Type: GrantFiled: March 20, 2006Date of Patent: May 12, 2009Assignee: Fujitus LimitedInventor: Keiji Nibe
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Patent number: 7526291Abstract: There is provided a method and apparatus for managing supplemental channel data rates in a wireless telephone system. More specifically, there is provided a method comprising determining latency values for each of a plurality of mobile devices, determining fairness values for each of the plurality of mobile devices, and ranking the plurality of mobile devices based on the latency values and the fairness values to create a ranked list of mobile devices that can be employed to manage supplemental data rates for the plurality of mobile devices.Type: GrantFiled: May 20, 2005Date of Patent: April 28, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Thierry E. Klein, Aleksandr Stolyar, Stan Vitebsky
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Patent number: 7519345Abstract: A receiving apparatus according to the present invention includes an obtaining unit operable to obtain the reception level of a first radio wave received via one antenna of first and second antennas, and a transmission rate representing the transmission speed of the first radio wave, the transmission rate being included in the first radio wave and being set by a transmitting apparatus transmitting the first radio wave; a storing unit operable to store, for each of a plurality of transmission rates, a range of signal reception levels in which a packet error rate is substantially 0%; a determining unit operable to determine whether to switch from the one antenna to another antenna based on the reception level of the first radio wave and a first range of reception levels stored in the storing unit which correspond to the transmission rate of the first radio wave; and a controlling unit operable to control switching of the antennas when the determining unit determines to switch from the one antenna to the anotherType: GrantFiled: January 14, 2005Date of Patent: April 14, 2009Assignee: Sony CorporationInventor: Nobuyuki Mori
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Patent number: 7515893Abstract: Described herein is an apparatus for inclusion in a station of a wireless network, and a method implemented in a station of a wireless network. The method includes wirelessly receiving data via each of a plurality of antennas, the data corresponding to a packet of information transmitted from a remote station, sampling the received data corresponding to the received packet to form data samples for each of the antennas, and determining a measure of signal quality from samples of the received data for each of the antennas. The method further includes selecting one of the plurality of receive antennas as the antenna for receiving from the remote station according to the determined measure of signal quality.Type: GrantFiled: May 4, 2005Date of Patent: April 7, 2009Assignee: Cisco Technology, Inc.Inventors: Daniel Joseph Lyons, Brian Hart
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Patent number: 7515939Abstract: Systems and methods that provide channel-adaptive antenna selection in multi-antenna-element communication systems are provided. In one embodiment, a method that selects a subset of receive antennas of a receiver to receive a transmitted RF signal may include, for example, one or more of the following: establishing possible subsets of the receive antennas; determining sets of channel parameter statistics corresponding to the possible subsets of the receive antennas; computing output bit error rates of the receiver, each output bit error rate being computed based on at least one set of channel parameter statistics; selecting a particular possible subset of the receive antennas based upon a criterion predicated on the computed output bit error rates; and connecting one or more RF chains of the receiver to the receive antennas of the selected particular possible subset.Type: GrantFiled: November 3, 2004Date of Patent: April 7, 2009Assignee: Broadcom CorporationInventors: Severine Catreux-Erceg, Vinko Erceg, Pieter Roux, Pieter Van Rooyen, Jack Winters
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Patent number: 7505417Abstract: A method of adapting a mobile telecommunication system to channel conditions. To control transmission of a data packet from an access network (AN) in both a link adaptation scheme and an ARQ (Automatic Repeat reQuest) scheme, an access terminal (AT) compares the received power of a forward pilot signal received from the AN with a predetermined first threshold, checks errors in the data packet of a received time slot if the reception power is greater than the first threshold, and transmits a signal requesting termination of retransmission of the data packet to the AN if no errors are found in the data packet after decoding.Type: GrantFiled: June 27, 2001Date of Patent: March 17, 2009Assignee: Samsung Electronics Co., Ltd.Inventors: Hoon Huh, Yu-Suk Yun, Soon-Young Yoon, Jae-Heung Yeom, Sang-Hyun Yang, Hee-Won Kang
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Patent number: 7499691Abstract: An improved smart antenna reception method and devices are provided that determine when to select a new antenna configuration in a multiple antenna configuration system. One embodiment attempts to eliminate unneeded configuration searching. Unneeded configuration searching can degrade overall signal quality and system performance. Configuration changing can be minimized by determining that a signal quality received from a first antenna configuration is below a threshold and changing antenna configuration. After changing antenna configuration, if the signal quality received from the second antenna configuration is lower than the signal quality received from the first antenna configuration the threshold can be lowered. By lowering the threshold, the probability of additional configuration changing can be reduced.Type: GrantFiled: November 29, 2005Date of Patent: March 3, 2009Assignee: Kyocera Wireless Corp.Inventors: Doug Dunn, Henry Chang
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Patent number: 7493096Abstract: An apparatus and method for processing DMB signals in a DMB receiver such as a mobile communication terminal are disclosed to simplify the DMB receiver. The apparatus for processing DMB signals received via at least two antennas includes: an antenna switching unit for selecting one of at least two signals received via the two antennas; a DMB path unit for pre-processing the selected signal; and a DMB chipset unit for detecting a signal level of the pre-processed signal, and controlling the antenna switching unit, wherein the DMB chipset unit controls the antenna switching unit to select the other one of the two signals according to the signal level detected by the DMB chipset unit.Type: GrantFiled: November 22, 2005Date of Patent: February 17, 2009Assignee: LG Electronics Inc.Inventor: Sung Ho Chu
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Publication number: 20090042529Abstract: There is disclosed an antenna diversity system for relatively broadband broadcast reception in vehicles such as motor vehicles. The device can include a diversity processor having numerous components including a microprocessor for controlling a signal selection switch. In alternative embodiments the processor can be incorporated into a receiver or into a multi-antenna system. One advantage of these designs is that it is able to exist with one reception tuner and being able to select one signal from a plurality of antenna signals A1, A2, . . . AN, with great probability, whose signal components lie above the level necessary for interference-free reception, over the entire channel bandwidth B.Type: ApplicationFiled: July 10, 2008Publication date: February 12, 2009Applicant: DELPHI DELCO ELECTRONICS EUROPE GmbHInventors: Heinz LINDENMEIER, Stefan LINDENMEIER, Jochen HOPF, Leopold REITER
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Patent number: 7486931Abstract: A cellular mobile communication system using multiple antennas reselects a plurality of transmission antennas of base stations connected to a mobile station. The system includes measuring a channel quality parameter used for estimation of channel performance, determining whether to reselect the transmission antennas using the measured channel quality parameter, reselecting transmission antennas of the base stations connected to the mobile station, and connecting the reselected transmission antennas to the base station.Type: GrantFiled: April 14, 2005Date of Patent: February 3, 2009Assignees: Samsung Electronics Co., Ltd., Board of Regents, The University of Texas SystemInventors: Sung-Hyun Cho, Robert W. Heath
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Patent number: 7486940Abstract: A digital broadcast receiving apparatus, which has a receiving circuit for receiving a transmitted high frequency signal of a plurality of time division multiplexed programs, includes a circuit for selecting a better receiving characteristic condition while a desired program is not received.Type: GrantFiled: March 15, 2004Date of Patent: February 3, 2009Assignee: Panasonic CorporationInventors: Hiroaki Ozeki, Hisaya Kato, Sadashi Kageyama, Takeo Yasuho
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Patent number: 7483718Abstract: Systems and methods that provide antenna selection in multi-antenna-element communication systems are provided. In one embodiment, a system that selects N antenna elements in an M-antenna-element transmitter or an M-antenna-element receiver, in which N is less than M, may include, for example, M antenna elements in the M-antenna-element transmitter or the M-antenna-element receiver; N RF chains; and a switch coupled to the N RF chains. The M-antenna-element receiver may determine a bit error rate for each possible N antenna element subset of the M antenna elements. The M-antenna-element receiver may determine the particular N antenna element subset with a lowest bit error rate. In response to the determination of the particular N antenna element subset with the lowest bit error rate, the switch may couple the N RF chains to the particular N antenna element subset with the lowest bit error rate.Type: GrantFiled: October 1, 2004Date of Patent: January 27, 2009Assignee: Broadcom CorporationInventors: Severine Catreux-Erceg, Vinko Erceg, Pieter Roux, Pieter Van Rooyen, Jack Winters
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Publication number: 20080299931Abstract: The present invention provides a system (300-400), apparatus (300-400), and method for an energy-based antenna selection technique in which the antenna that observes the largest SNR averaged over all carriers per sub-band (405) is selected for space-time coded MB-OFDM systems. Due to the frequency-selective nature of the system, different sub-band may have different channel gaining effect from the multi-path channels. We can perform energy-based antenna selection per sub-band, and the simulation results show that the proposed technique works not only for MB-OFDM UWB channels with shadowing, but also for the same channel without shadowing.Type: ApplicationFiled: December 8, 2006Publication date: December 4, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Jun Yang, Dagnachew Birru, Seyed-Alireza Seyedi-Esfahani, Charles Razzell
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Patent number: 7457587Abstract: A method for forming an array antenna beam of a mobile terminal periodically compares transmit/receive characteristics of a three-dimensional adaptive beam with transmit/receive characteristics of an omnidirectional beam periodically. A beam direction having better transmit/receive characteristics is then selected. By horizontally rotating an array antenna beam toward up or down at an angle of 360° degrees, a direction having a maximum signal receiving value is searched, and a three-dimensional adaptive beam is set in the searched direction. By using position information of a mobile terminal together with the detected information, a beam direction is set. And, by comparing beam direction information set toward a maximum signal receiving direction with beam direction information set on the basis of position information of a base station/mobile terminal, an optimum beam is selected and formed, thereby improving transmit/receive characteristics of the mobile terminal.Type: GrantFiled: September 2, 2004Date of Patent: November 25, 2008Assignee: LG Electronics Inc.Inventor: Hee-Sok Chung
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Patent number: 7454183Abstract: A method and system for antenna selection diversity with dynamic gain control. A receiver selects a starting antenna and dwells on it until an incoming signal is detected. An AGC is applied on the received signal and an estimate of the received power is determined for the starting antenna. The receiver may dwell on other antennas if the signal in the first antenna is not strong enough for signal processing. The gain of an antenna may be set by the gain and power levels of the previously dwelled-on antennas and/or by a power coupling factor that exists between the antennas in an antenna switch. The receiver switches through the remaining antennas as long as necessary to select at least one of the antennas for signal processing. Dynamically adjusting the gain of antennas in a diversity system provides a more accurate and efficient antenna selection scheme.Type: GrantFiled: March 26, 2004Date of Patent: November 18, 2008Assignee: Broadcom CorporationInventors: Rajendra Tushar Moorti, Min Chuin Hoo
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Patent number: 7454181Abstract: A mobile device comprises a receiver unit that has at least two receivers to implement multi-antenna receive diversity. A control unit estimates, at the mobile, an amount of utilization by a traffic channel of the mobile of total transmission power capacity at a base station. The mobile applies multi-antenna receive diversity in the mobile device based on the power capacity utilization. The mobile estimates an amount of power a network is transmitting to the mobile relative to a pilot reference. Other indicators are based on quality of the traffic channel between the mobile and the network, capacity limiting resources, a number of sectors in a soft hand-off in a wireless system, etc. The indicators are used to control application of multi-antenna receive diversity in a mobile device.Type: GrantFiled: March 4, 2005Date of Patent: November 18, 2008Assignee: QUALCOMM IncorporatedInventors: Brian C. Banister, Fatih Ulupinar, Gregory A. Breit, Edward G. Tiedemann, Jr.
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Patent number: 7450922Abstract: A system adjusts a receiving device in response to sensing symbols. An automatic gain control is adjusted in response to receiving a first symbol of a data unit from a first antenna. After adjusting the automatic gain control at least a second and a third symbol of the data unit are received. The automatic gain control in response to receiving a fourth symbol of the data unit from a second antenna is received. After adjusting the automatic gain control at least a fifth and a sixth symbol of the data unit is received. At least one of the first and second antenna is selected based upon a function of a first and second energy, calculated using the second and third symbol, and the fifth and sixth symbol, respectively.Type: GrantFiled: December 7, 2004Date of Patent: November 11, 2008Assignee: Sharp Laboratories of America, Inc.Inventor: Srinivas Kandala
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Patent number: 7432857Abstract: An adaptive antenna apparatus is provided with a total of four or more, even number N of antennas including a plurality of pairs of antennas each having a bidirectional characteristic. The N antennas are provided respectively at vertexes of a polygon of the same number as the number N of the antennas, so that each pair of antennas of the plurality of pairs of antennas opposes to each other. An adaptive control circuit takes an adaptive control over radio signals using one pair of antennas opposing to each other among the N antennas. In the adaptive antenna apparatus, the each pair of antennas is provided to oppose to each other so that axes of directions of main beams of the directional characteristics of the each pair of antennas substantially coincide with each other.Type: GrantFiled: November 5, 2004Date of Patent: October 7, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Atsushi Yamamoto, Koichi Ogawa, Hirotaka Ishihara