Including Directive Communication System Patents (Class 342/367)
  • Publication number: 20090153400
    Abstract: The present invention relates to a method for transmitting signals in a wireless communication system, in which signals are transmitted from a first communication device to a second communication device, said signals being transmitted in consecutive frames, each frame having a preamble section including preamble information, at least one of said first and said second communication devices having a narrow beam antenna which is adapted to be steered to different positions, each of said different positions corresponding to one of a number of different transmissions paths from said to said second communication device, including the steps of transmitting and receiving a first preamble section including preamble information enabling the estimation of a channel quality of a current transmission path, while said narrow beam antenna is in a current position corresponding to said current transmission path, steering said narrow beam antenna from said current position to a different position corresponding to a candidate
    Type: Application
    Filed: February 10, 2009
    Publication date: June 18, 2009
    Applicant: Sony Deutschland GmbH
    Inventors: Zhaocheng WANG, Masahiro Uno, Volker Wullich
  • Publication number: 20090128410
    Abstract: A method for allocating power for beamforming is described. The method includes selecting a number of data streams to be employed. Power for beamforming is allocated to the selected number of data streams based upon the effective SINR and in consideration of a FEC code. The allocation of power may be based upon maximizing the effective SINR. Additionally, the method may include determining an effective SINR using an EESM procedure. An apparatus, computer readable medium and system are also described.
    Type: Application
    Filed: November 15, 2007
    Publication date: May 21, 2009
    Inventor: Shaohua Li
  • Patent number: 7535419
    Abstract: A device for user data transmission implemented in an aircraft for transmitting user data to a relay aircraft. The device includes a controllable directional antenna arrangement and an antenna steering module that is structured and arranged to control radiation properties and transmitting power of the antenna arrangement. Moreover, the device includes an antenna orientation module and a threat management system. Additionally, the device includes an optimization device. Furthermore, the threat management system and the optimization device are associated with the antenna steering module and the optimization device receives a desired radiation profile from the threat management system and a desired direction range of an antenna lobe from the antenna orientation module. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: May 19, 2009
    Assignee: EADS Deutschland GmbH
    Inventors: Peter Hurst, Ludwig Mehltretter, Monika Von Der Werth
  • Publication number: 20090124199
    Abstract: An embodiment of the present invention provides an apparatus, comprising at least one transceiver operable in a wireless personal area network (WPAN), wherein said at least one transceiver is equipped with the directional antennas adapted to point substantially vertically towards a horizontal reflecting surface, such as a ceiling, and with an antenna pattern specifically designed to control the interference levels.
    Type: Application
    Filed: November 8, 2007
    Publication date: May 14, 2009
    Inventors: Alexander Maltsev, Alex Kesselman, Roman Maslennikov, Alexey Khoryaev, Alexey Sevastyanov
  • Patent number: 7511663
    Abstract: The present invention relates to a method for transmitting signals in a wireless communication system, in which signals are transmitted from a first communication device to a second communication device, said signals being transmitted in consecutive frames, each frame having a preamble section comprising preamble information, at least one of said first and said second communication devices having a narrow beam antenna which is adapted to be steered to different positions, each of said different positions corresponding to one of a number of different transmission paths from said first to said second communication device, comprising the steps of transmitting and receiving a first preamble section comprising preamble information enabling the estimation of a channel quality of a current transmission path, while said narrow beam antenna is in a current position corresponding to said current transmission path, steering said narrow beam antenna from said current position to a different position corresponding to a ca
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: March 31, 2009
    Assignee: Sony Deutschland GmbH
    Inventors: Zhaocheng Wang, Masahiro Uno, Volker Wullich
  • Publication number: 20090079631
    Abstract: A device for user data transmission implemented in an aircraft for transmitting user data to a relay aircraft. The device includes a controllable directional antenna arrangement and an antenna steering module that is structured and arranged to control radiation properties and transmitting power of the antenna arrangement. Moreover, the device includes an antenna orientation module and a threat management system. Additionally, the device includes an optimization device. Furthermore, the threat management system and the optimization device are associated with the antenna steering module and the optimization device receives a desired radiation profile from the threat management system and a desired direction range of an antenna lobe from the antenna orientation module. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
    Type: Application
    Filed: October 26, 2004
    Publication date: March 26, 2009
    Applicant: EADS Deutschland GmbH
    Inventors: Peter Hurst, Ludwig Mehltretter, Monika Von Der Werth
  • Publication number: 20090051591
    Abstract: With a power supply provided for a smart antenna, whether the antenna is connected is determined according to whether the power supply is connected. When it is determined that the smart antenna is not connected, power supply to units related only to controlling of the smart antenna is stopped, whereby power saving is realized. Further, user's setting for discriminating kinds of antennas becomes unnecessary and, when a smart antenna is not connected, power supply for the same can be prevented.
    Type: Application
    Filed: August 15, 2008
    Publication date: February 26, 2009
    Applicants: THE UNIVERSITY OF ELECTRO-COMMUNICATIONS, DX Antenna Company, Limited, Funai Electric Co., Ltd.
    Inventors: Nobuo Nakajima, Koichi Gyoda, Eiji Shibuya, Takehiro Onomatsu, Hideto Yoshimura
  • Patent number: 7486174
    Abstract: A system and method for adaptive motion sensing with location determination is described. In one embodiment, the adaptive motion sensor is based on vibration sensor readings and can identify different states of motions based on modifiable parameters.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: February 3, 2009
    Assignee: SkyBitz, Inc.
    Inventors: Rich Battista, Jianming Yuan
  • Patent number: 7483719
    Abstract: Disclosed is a method for configuring transmission antenna groups in a mobile communication system with multiple transmission antennas and multiple reception antennas. The method includes the steps of: receiving a first matrix having a size of ‘Nt×Nt’, which corresponds to Nt number of transmission antennas, fedback from the mobile terminal, generating combinations of sub-matrixes of the first matrix corresponding to Nr number of reception antennas, and calculating sums of maximum eigenvalues; determining combinations of the sub-matrixes having a maximum value from among the calculated sums of eigenvalues to be transmission antenna groups for the Nt number of transmission antennas; and transmitting different relevant symbols from each other through the transmission antenna groups.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: January 27, 2009
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology (KAIST)
    Inventors: Eung-Sun Kim, Jong-Hyeuk Lee, Jae-Hak Chung, Ho-Jin Kim, Joo-Hwan Chun, Kyung-Chun Lee, Il-Han Kim
  • Publication number: 20090015472
    Abstract: The present invention provides a method of determining a plurality of beamforming weights for application to multicast transmission to a plurality of users by a corresponding plurality of antennas associated with a base station. One embodiment of the method includes determining a covariance matrix associated with the plurality of users. The covariance matrix is determined based on a channel matrix and a noise-plus-interference vector associated with each user. The method also includes determining the plurality of beamforming weights based on a gradient of the covariance matrix associated with a selected one of the plurality of users and storing the plurality of beamforming weights.
    Type: Application
    Filed: July 11, 2007
    Publication date: January 15, 2009
    Inventor: ANGEL LOZANO
  • Publication number: 20090015473
    Abstract: An adaptive array antenna is disclosed which permits the circuit scale to be reduced by omitting a down-converter, an AD converter, and interconnects for them while controlling the directivity well. In one aspect, the array antenna comprises phase shift-amplitude control modules which accept signals received by antenna elements via an analog-to-digital converter. The value of any one of phase-amplitude change modules is set to 1. The values of the other phase-amplitude change modules are set to 0. Thus, the signal from any one antenna element is accepted. This sequence of operations is repeated as many times as there are antenna elements, whereby signals received by all the antenna elements can be accepted.
    Type: Application
    Filed: May 7, 2008
    Publication date: January 15, 2009
    Applicant: Taiyo Yuden Co., Ltd.
    Inventors: Chikahiro Tomita, Fumitaka Iizuka, Kenji Kamitani
  • Publication number: 20080309554
    Abstract: The present invention provides a method for suppressing interference using beamforming of uplink signals received at multiple base stations. The method may include accessing information indicative of a plurality of signals received over a plurality of uplink channels between a plurality of mobile units and a plurality of base stations. The method may also include forming a plurality of weighted signals by applying a plurality of beamforming weights to the plurality of signals. The plurality of beamforming weights are determined based on estimates of the channels from the plurality of users to the plurality of base stations and estimated interference between the signals. The method may further include combining subsets of the plurality of weighted signals associated with each of the plurality of mobile units.
    Type: Application
    Filed: June 14, 2007
    Publication date: December 18, 2008
    Inventor: Sivarama K. Venkatesan
  • Publication number: 20080297413
    Abstract: A method includes determining for each access point and each associated client that has traffic to exchange with the access point in either directions of a link a pattern of slots of times that causes minimum interference to clients of other access points in a wireless local area network; deriving a conflict graph of pair wise patterns of different access points representing which patterns conflict on a particular client, the conflict graph representing which patterns of the slots cannot be scheduled simultaneously in a slot so as to avoid interference; and generating a schedule for each access points in the slots such that no two conflicting patterns for two different access points are scheduled in the same slot.
    Type: Application
    Filed: May 29, 2008
    Publication date: December 4, 2008
    Inventors: Ravindranath Kokku, Samrat Ganguly, Vishnu Navda
  • Publication number: 20080297406
    Abstract: A fast and efficient automated satellite constellation detection process can be implemented at least in part independent of in-band data in the satellite signal. The automated detection process iterates through a set of various predefined transponder settings to detect one or more accessible satellite constellations through each satellite dish connected directly or through a switch to a satellite receiver. The process determines whether the satellite receiver is able to lock onto a satellite signal at each transponder setting. Based on the combinations of which satellite constellations are available at each transponder setting, the process allocates a specific satellite constellation to each satellite dish. In one implementation, channel information can be used to further refine the detection and identification of accessible satellite constellations for each satellite dish.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 4, 2008
    Applicant: Microsoft Corporation
    Inventors: Lucian Dragne, Rathe Hollingum, Gunther Logemann, Lorcan Mooney
  • Publication number: 20080297401
    Abstract: An arrival angle estimation system includes a transmitting device and a receiving device and estimates an arrival angle at which frames transmitted by radio from the transmitting device arrive at the receiving device. The transmitting device includes two directional antennas each arranged so that its directivity is tilted at ±? degrees with respect to the front of the transmitting device. The receiving device includes a directional antenna having directivity toward the front of the receiving device. Frames are transmitted alternately from the respective directional antennas of the transmitting device, and received signal strengths of the frames on the receiving device side for the respective transmitting directional antennas are compared with each other to estimate the arrival angle.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Inventor: Yoshifumi NISHIDA
  • Patent number: 7460834
    Abstract: A method and apparatus for utilizing a switched beam directional antenna in a wireless transmit/receive unit (WTRU) is disclosed. A wireless communication system includes a serving cell, a neighbor cell and a WTRU. The WTRU is configured to generate and steer a directional beam in a plurality of directions. Once the WTRU registers with the wireless communication system, the WTRU receives messages transmitted by the serving cell. The WTRU measures signal quality of messages received in each of a plurality of predetermined directions while steering the directional beam antenna. The WTRU selects a particular one of the directions having the best signal quality. As the WTRU constantly moves, the WTRU monitors signal quality in the selected direction, and switches to another direction when the signal quality in a current direction drops below a predetermined threshold.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: December 2, 2008
    Assignee: InterDigital Technology Corporation
    Inventors: Kevin Peter Johnson, Ross L. Lintelman, Michael James Lynch, Gregg Arthur Charlton, Carl Wang, Kambiz Casey Zangi
  • Publication number: 20080291086
    Abstract: A radio device that is capable of positioning itself using one or more available positioning techniques includes a selection parameter defined to enable selection of at least one of the available positioning techniques supported by the radio device for use in calculating the location of the radio device. At least one of the positioning techniques supported by the radio device is a broadcast positioning technique that uses broadcast radio signals broadcast from radio stations to calculate the location of the radio device.
    Type: Application
    Filed: February 6, 2008
    Publication date: November 27, 2008
    Applicant: BROADCOM CORPORATION
    Inventors: John Walley, Kambiz Shoarinejad, Nambirajan Seshadri, Jeyhan Karaoguz
  • Publication number: 20080291083
    Abstract: A retro-directive antenna for communicating with a geostationary satellite autonomously detects the direction from which a signal is received, and transmits a beam that points back along the same direction. An array feed is used to illuminate a parabolic reflector. Each feed element of the retro-directive antenna is associated with a unique pointing direction of the beam in the far field. As the transmit energy is switched to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in a slightly inclined orbit. This eliminates the need for mechanical tracking and maintains high antenna gain in the direction of the geostationary satellite. The use of a toroidal reflector with multiple linear array feeds spaced in the azimuth direction enables multi-beam operation, allowing multiple geostationary satellites, spaced by up to fifteen beam widths in azimuth, to be tracked simultaneously and independently.
    Type: Application
    Filed: May 16, 2008
    Publication date: November 27, 2008
    Inventor: DONALD CHIN-DONG CHANG
  • Patent number: 7440758
    Abstract: Coverage areas for wireless networks are divided into a plurality of cells that are arranged in rows. Channel frequencies are assigned to cell sectors and associated with respective antenna axes. The antenna axes of adjacent rows are alternatingly rotated, thereby reducing co-channel interference. In an example, an available bandwidth is divided into twelve channel frequencies, so that a cell cluster includes four cells. Co-channel cells associated with half the channel frequencies are assigned to cells in the first row of cells, and the remainder are assigned to cells in the second row.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: October 21, 2008
    Assignee: AT&T Mobility II LLC
    Inventors: Ming Zhang, Alan Denis MacDonald
  • Patent number: 7430257
    Abstract: Carrier Interferometry (CI) provides wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and/or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy smoothing in the frequency domain, and interference suppression. CI-based ultra-wideband protocols are implemented via frequency-domain processing to reduce synchronization problems, transceiver complexity, and poor multipath performance of conventional ultra-wideband systems.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: September 30, 2008
    Assignee: Lot 41 Acquisition Foundation, LLC
    Inventor: Steve Shattil
  • Publication number: 20080218413
    Abstract: Embodiments of millimeter-wave communication stations with directional antennas and methods for fast link recovery are generally described herein. Other embodiments may be described and claimed. In some embodiments, a transmitting station retransmits a packet in an adjacent direction when an acknowledgement is not received from a receiving station after a number of retransmission attempts. In other embodiments, a receiving station changes its reception to an adjacent direction when a packet is not received from a transmitting station after a number of missed reservations.
    Type: Application
    Filed: March 6, 2007
    Publication date: September 11, 2008
    Inventors: Guoqing C. Li, Kristoffer D. Fleming, Richard D. Roberts
  • Patent number: 7418238
    Abstract: A mote network having and/or using one or more directional antennas.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: August 26, 2008
    Assignee: Searete, LLC
    Inventor: Clarence T. Tegreene
  • Patent number: 7406336
    Abstract: The present invention relates to beamforming in a multi-carrier multi-user communication system applying an adaptive method for determining transmit weights for the various antenna beams. A set of complex transmission weights is adapted in response to appropriate feedback information on transmission quality from receiving units in order to achieve a maximization of a function of said quality indicator and thus optimize the transmission of the pilot signal.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: July 29, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: David Astely, Peter Larsson
  • Patent number: 7389086
    Abstract: An adaptive array antenna controller is disclosed that adaptively controls weighting coefficients of multiple antenna elements of an array antenna based on a digital signal outputted from an analog-to-digital converter receiving a weighted analog signal received from the array antenna. The controller includes an impulse response measuring device for obtaining impulse responses, based on correlation calculation of the digital signal and a known signal having a predetermined pattern; an impulse response generator for extracting path components existing within a predetermined time duration from among plural path components included in the impulse responses and generating desired impulse responses; a reference signal generator for forming a reference signal having a desired pattern, based on convolution calculation of the desired impulse responses and the known signal; and an adaptive controller for adjusting the weighting coefficients, based on the digital signal and the reference signal.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: June 17, 2008
    Assignee: Fujitsu Limited
    Inventors: Takeshi Toda, Yuuta Nakaya
  • Patent number: 7388540
    Abstract: A method for transmitting data from a transmitter to a receiver in an ad hoc large scale directional network includes the followings steps. A first training sequence is sent by a transmitter in an ad hoc directional network. The first training sequence is received by a receiver in the ad hoc directional network. The receiver determines a first apparent direction from which the first training sequence is sent. The receiver sends a second training sequence to the transmitter. The transmitter determines a second apparent direction from which the second training sequence is sent. The transmitter directs a signal with the first training sequence to the receiver. The transmitter sends the signal with the first training sequence to the receiver. The receiver receives the first training sequence. The receiver is directed to the first apparent direction to receive the signal.
    Type: Grant
    Filed: May 25, 2004
    Date of Patent: June 17, 2008
    Assignee: Rockwell Collins, Inc.
    Inventors: Scott J. F. Zogg, Kenneth M. Peterson, Michael N. Newhouse, Daniel M. Zange
  • Publication number: 20080136708
    Abstract: A Ubiquitous Sensor Network (USN) system using multi-channel having differential radio power and a method of configuring the USN system are provided. The USN system and the method include a sink node performing a communication with a sensor node using at least one or more frequency signal having differential outputs; and a sensor node performing the communication with the sink node using the at least one or more frequency signal. The USN system and the method simultaneously use a control frequency signal having a high output power and a data frequency signal having an output power lower than that of the control frequency signal, thereby reducing a beacon transmission delay, enabling time synchronization between the sensor nodes, and preventing collisions between beacons due to beacon relays among the sensor nodes, so as to configure a more efficient sensor field.
    Type: Application
    Filed: October 31, 2007
    Publication date: June 12, 2008
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Se Han Kim, Ji Eun Kim, Nae Soo Kim, Cheol Sig Pyo
  • Publication number: 20080136707
    Abstract: An apparatus for generating a device address of a wireless local network includes an alien beacon determination unit which determines whether a received beacon is an alien beacon; a zone identity management unit which compares an alien zone identity included in the received beacon with a zone identity of a corresponding device if the received beacon is the alien beacon, and regenerates the zone identity of the corresponding device if the alien zone identity is identical to the zone identity of the corresponding device; and a device address generation unit which regenerates a device address of the corresponding device if a device address of an alien beacon group is identical to the device address of the corresponding device.
    Type: Application
    Filed: October 17, 2007
    Publication date: June 12, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Chang Woo Seo, Seung Hwan Oh, Dong Won Kwak
  • Patent number: 7382275
    Abstract: A mobile enforcement reader (MER) includes an antenna, a reader coupled to receive signals from the antenna and a control/display unit (CDU) coupled to the reader. The CDU selects a receive direction and processes signals provided thereto from the reader. When the MER and a transponder are in proximity, the MER interrogates the transponder and receives information related to toll payment. The MER allows enforcement officials to monitor payment by single occupancy vehicle (SOV) traffic for use of high occupancy traffic (HOT) lanes.
    Type: Grant
    Filed: August 18, 2005
    Date of Patent: June 3, 2008
    Assignee: Raytheon Company
    Inventors: Ira R. Feldman, Paul A. Moosie, Brian E. Patno
  • Patent number: 7382316
    Abstract: At least one radiation pattern is rotated at a first radio station for the purpose of sampling a predefined angular range. At a first time of rotation, a second radio station is detected with a first angular position within the angular range corresponding to the first time. The second radio station determines a first quality value which can be assigned to the first angular position and reports the first quality value back to the first radio station. The first quality value is available for evaluation at the first radio station at a second time corresponding to a second angular position of the radiation pattern. The first radio station controls the speed of rotation of the at least one radiation pattern for subsequent rotations so that the first angular position corresponds to the second angular position.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: June 3, 2008
    Assignee: Nokia Siemens Networks GmbH & Co. KG
    Inventors: Markus Jordan, Axel Klein, Lars Schmitt, Ingo Viering
  • Publication number: 20080117961
    Abstract: Disclosed is an apparatus and method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising: a plurality of sub-arrays for beamforming, which are geographically distributed and each of which comprises a plurality of distributed antennas placed in random groups; and a central processing unit for identifying performances of subsets by applying a predetermined power allocation scheme according to subsets which can be obtained by combining the sub-arrays, by means of a Nakagami fading parameter and information about large-scale fading of each of the sub-arrays, fed back from a receiving party, for determining a subset having a best performance as an optimal subset according to the identified performances, and for performing power allocation based on the subset set as the optimal subset.
    Type: Application
    Filed: October 12, 2007
    Publication date: May 22, 2008
    Inventors: Shuangfeng Han, Seong-Taek Hwang, Hoon Kim, Sang-Ho Kim, Jae-Hun Cho, Jae-Hoon Lee, Ki-Uk Song
  • Publication number: 20080106465
    Abstract: The radio receiving set comprises: an antenna selecting section for selecting one of a plurality of antennas which receive analogue television broadcasts; a receiving section for reproducing a composite video signal and a composite synchronizing signal from a reception signal outputted from a selected antenna; a continuity judging unit which generates a correction control signal indicating a correction instruction and another correction control signal not performing a correction instruction; a level detection unit for detecting the level of each composite video signal reproduced by the receiving section; a correction unit which applies a correction processing to each of said level detection signals; and an antenna switchover control unit which performs a comparison among the respective correction detection signals, controls the antenna selecting section to select an antenna corresponding to a maximum correction detection signal.
    Type: Application
    Filed: September 27, 2005
    Publication date: May 8, 2008
    Inventor: Satoru Suzuki
  • Patent number: 7366473
    Abstract: A method and apparatus for diversity switching control are generally described herein. According to one embodiment, a diversity control network is introduced which effectively reduces the number of coaxial cables required to interface with N antennas from the conventional N cables, to N/2 thereby providing significant cost saving.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: April 29, 2008
    Assignee: Intel Corporation
    Inventors: Xintian E. Lin, Qinghua Li, Allen W. Bettner
  • Patent number: 7362259
    Abstract: For suppressing secondary lobes in pulsed radar systems, the antenna characteristics of the transmitting antenna and the receiving antenna are designed so that the dominant secondary lobes appear mutually offset and their maximums and minimums are mutually suppressed. This increases the safety against detection of false targets.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: April 22, 2008
    Assignee: Robert Bosch GmbH
    Inventor: Frank Gottwald
  • Publication number: 20080075038
    Abstract: A communication method using a direct link in a wireless network and an apparatus therefor are provided. Accordingly, it is determined whether the quality of a link channel is lower than a level during communication using the direct link or whether a signal which is received through the channel includes a radar signal, and the direct link channel is selectively changed to a new channel based on the determination result.
    Type: Application
    Filed: July 23, 2007
    Publication date: March 27, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ho JIN, Kyung-ik CHO
  • Publication number: 20080074320
    Abstract: An apparatus and method is provided for disabling radio frequency signal transmissions from a wireless communications network modem when in proximity to sites where explosive devices are being detonated. The apparatus includes an input switch to signal a command to the modem to disable the transmitter portion of the modem or to tune the transmitter to a null gateway on the wireless communications network. By disabling transmissions from the modem, accidental detonation of explosive devices is prevented When the modem is moved a safe distance away from the explosive devices, the transmitter is re-enabled automatically.
    Type: Application
    Filed: September 21, 2007
    Publication date: March 27, 2008
    Applicant: GEOTRAC INTERNATIONAL INC.
    Inventor: Amr Khaled NASR
  • Patent number: 7340281
    Abstract: A method and system is disclosed for enhancing reception of wireless communication signals. A beam pattern including at least one set of beams is generated. Where the beam pattern includes at least two sets of beams, the beam sets may be offset with respect to each other and alternated to enhance reception. Beams may be selected for data processing based on a signal-to-noise ratio (SNR) and may be maximal-ratio combined where signals from a single WTRU are detected within more than one beam and are used for data processing.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: March 4, 2008
    Assignee: InterDigital Technology Corporation
    Inventors: Eldad Zeira, Donald M. Grieco, Robert Lind Olesen, Ariela Zeira, Jung-Lin Pan, Aykut Bultan
  • Patent number: 7340254
    Abstract: Measurement opportunities are provided to a wireless transmit/receive unit (WTRU) operating with a switched beam antenna in a CDMA wireless communication system. The switched beam antenna is a smart antenna generating a plurality of directional beams and an omni-directional beam. The bursty nature of packet data transmission generates periods of inactivity or low traffic during a call. The WTRU switches to antenna beams other than the selected antenna beam for receiving and measuring signals during these periods of inactivity or low traffic. Moreover, if the network has knowledge of the fact the WTRU is operating using a switched beam antenna, the network can use this information when making decisions on channel allocations, thus providing frequent measurement opportunities to the WTRU in order to support the switched beam antenna operation.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: March 4, 2008
    Assignee: Interdigital Technology Corporation
    Inventor: Ana Lucia Iacono
  • Patent number: 7333835
    Abstract: The disclosed embodiments relate to a system and method for providing user specific beams in a fixed beam network. In one embodiment, there is provided a mobile transceiver comprising a first device configured to receive phase reference signal data from a base station, the phase reference signal data being indicative of a first phase reference signal and a second phase reference signal that may be used by the mobile transceiver during a communication session, and a second device configured to determine whether the second phase reference signal is likely to provide improved reception between the base station and the mobile transceiver with respect to the first phase reference signal, wherein the second device is configured to transmit data to the base station, the data being indicative of whether the first phase reference signal or the second phase reference signal is likely to provide improved reception between the base station and the mobile transceiver.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: February 19, 2008
    Assignee: Lucent Technologies Inc.
    Inventor: Shirish Nagaraj
  • Patent number: 7324817
    Abstract: A wireless communication method and apparatus for selecting and reselecting cells used by a wireless transmit/receive unit (WTRU) in a wireless multi-cell communication system. The WTRU includes a switched beam antenna configured to form a plurality of directional beams and an omni-directional beam pattern. The WTRU measures signals from a plurality of cells using the directional beams and the omni-directional beam pattern. The WTRU selects and registers with the cell having the strongest signal. In one embodiment, the WTRU selects a directional beam which has the strongest signal and uses it as an active beam to communicate with the selected cell. In another embodiment, the WTRU selects a cell/beam combination and registers with the selected cell using the selected beam. In yet another embodiment, the WTRU initiates a handoff to a neighboring cell that has a better signal measurement result than the selected cell.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: January 29, 2008
    Assignee: InterDigital Technology Corporation
    Inventors: Ana Lucia Iacono, Janet Stern-Berkowitz
  • Patent number: 7317898
    Abstract: A mote network having and/or using one or more directional antennas.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: January 8, 2008
    Assignee: Searete LLC
    Inventor: Clarence T. Tegreene
  • Patent number: 7313409
    Abstract: A method and apparatus for transmit power control (TPC) while switching a beam among a plurality of beams in a wireless communication system. An antenna array generates a plurality of directional beams and preferably an omni-directional pattern and switches a beam among the plurality of beams preferably including the omni-directional pattern. Link quality on at least one of the plurality of beams is measured, and a beam having a greatest link quality is selected. If the selected beam is different from a current beam, a beam is switched from the current beam to the selected beam. While switching a beam, TPC parameters are adjusted based on the link quality difference between the link quality of the current beam and the link quality of the selected beam, and optionally, base on other parameters.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: December 25, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Ana Lucia Iacono, Janet Stern-Berkowitz, Timothy A. Axness, Kambiz Casey Zangi
  • Patent number: 7313417
    Abstract: Disclosed is a transceiver for a base station with a smart antenna having a plurality of antennas. The transceiver comprises: a multipath searching unit for searching multipath delay information for each demodulation channel; a demodulating unit for forming an adaptive beam for each demodulation channel by using the multipath delay information for each demodulation channel for receiving signals and performing demodulation to the received signals and outputting at least one adaptive beam weight vector; a controlling unit for selecting at least one downlink beam index for each channel; and a modulating unit for selecting the downlink switched beams and forming switching beam for modulating signals of each channel and outputting the modulated signals in downlink.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: December 25, 2007
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Il-Gyu Kim, Hye-Kyung Jwa, Seung-Chan Bang
  • Patent number: 7308264
    Abstract: Measurements for identifying pre-candidate cells are made by a wireless transmit/receive unit (WTRU) operating with a switched beam antenna in a wireless communication system. The switched beam antenna is a smart antenna generating a plurality of directional beams and an omni-directional beam. The WTRU measures signals from cells not in an active set of cells to define a pre-candidate set of cells. Measured signals from cells in the pre-candidate set of cells are compared to a threshold, and the corresponding cells are moved from the pre-candidate set of cells to a candidate set of cells based upon the comparison to the threshold. A measurement report is then sent to the network.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: December 11, 2007
    Assignee: Interdigital Technology Corporation
    Inventors: Janet Stern-Berkowitz, Ana Lucia Iacono, Kambiz Casey Zangi
  • Patent number: 7304607
    Abstract: A high-directivity transponder system uses a dual system of a retrodirective array transmitting a data signal peak toward an interrogator source, and a self-null-steering array transmitting a null toward the interrogator source and a jamming signal elsewhere, resulting in high S/N reception at the interrogator source and avoidance of interception. Integrating modulators would allow each array to transmit different data while the spectra of the transmitted signals are identical, thus disabling interception. The system enables secure point-to-point communications and can be used for short-distance wireless data transmission systems such as wireless LAN and RFID servers.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: December 4, 2007
    Assignee: University of Hawai'i
    Inventors: Ryan Y. Miyamoto, Wayne A. Shiroma, Grant S. Shiroma, Blaine T. Murakami, Aaron Ohta, Michael Tamamoto
  • Patent number: 7289827
    Abstract: An antenna for use with a receiver in a wireless communications system includes antenna elements for generating antenna patterns, and a first module for applying weights to a signal received at each of the antenna elements to generate a selected one of the antenna patterns. A second module detects the received signal at each of the antenna elements. A combiner combines the received signal detected at each of the antenna elements to produce a combined received signal for a selected antenna pattern. A third module determines a signal quality metric for the combined received signal at each selected antenna pattern. The first module is responsive to the determined signal quality metrics for adjusting the weights to generate a preferred antenna pattern.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: October 30, 2007
    Assignee: IPR Licensing, Inc.
    Inventors: James Arthur Proctor, Jr., Lawrence Wayne La Mont, Jr., George Rodney Nelson, Jr., Kenneth Marvin Gainey
  • Patent number: 7289556
    Abstract: An apparatus and a method for compensating signal attenuation based on an equalizer. The apparatus Includes an auto gain controller, an analog-to-digital converter and an auto-gain-control mapping circuit. The auto gain controller is used for receiving an incoming analog signal and amplifying the received analog signal. The analog-to-digital convertor is used for converting the output of the auto gain controller into a digital signal. The output of the auto-gain-control mapping circuit is used to control the gain of the auto gain controller. The equalizer is connected to the output of the analog-to-digital converter to eliminate signal attenuation in the digital output of the analog-to-digital converter. The output of the auto-gain-control mapping circuit controls the gain of the auto gain controller based on the primary weight of the equalizer.
    Type: Grant
    Filed: April 8, 2002
    Date of Patent: October 30, 2007
    Assignee: Faraday Technology Corp.
    Inventors: Jyh-Ting Lai, Shih-ming Yu
  • Publication number: 20070222677
    Abstract: An apparatus and method for adjusting transmission phasing in a point-to-point communication link is disclosed. The relative phases of the transmissions from each antenna are adjusted before transmission to give optimum gain when received by two or more antenna elements and a signal combining element. The signal includes a data component, consisting of a subset of the subcarriers modulated with the input data, which is common to transmissions from all antenna elements; and a phase reference component consisting of a subset of the subcarriers that are modulated with a predetermined phase. The signal combining element is operable to receive the components and extract phase information.
    Type: Application
    Filed: February 26, 2007
    Publication date: September 27, 2007
    Applicant: MOTOROLA, INC.
    Inventor: Peter N. Strong
  • Patent number: 7274936
    Abstract: A method and apparatus for measuring a channel quality in wireless transmit/receive units (WTRUs) which are equipped with a subscriber based smart antenna. The WTRUs are equipped with a smart antenna so that the WTRU generates a plurality of directional beams and, optionally, an omni-directional beam. A dwell time is provided in a measurement period to switch a beam from an active beam to a non-active beam. The active beam is one of the plurality of directional beams or, optionally, the omni-directional beam, for communication with one or more serving base station(s). A beam is switched to a non-active beam at the initiation of the dwell time. Signals are received through the switched non-active beam, and samples of the received signals are generated. The samples are stored in a memory. Channel quality is measured using the samples, whereby the dwell time to measure the channel quality is minimized.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: September 25, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Kambiz Casey Zangi, Janet Stern-Berkowitz
  • Patent number: 7248217
    Abstract: A method of controlling multiple antenna signal transmission is disclosed. The method includes adjusting signal parameters so that transmission signals from a plurality of antennas combine to form a directional beam. A time duration in which the transmission signals are directed is controlled so that an average EIRP does not exceed a predetermined threshold.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: July 24, 2007
    Assignee: Tzero Technologies, Inc.
    Inventors: Sanjay Mani, Adam L. Schwartz
  • Patent number: 7218273
    Abstract: A technique for boresighting an antenna mounted on a moving platform is described. The technique uses a concurrently moving calibration target. Target navigation data and platform navigation data are used to compensate for movement of the target and the platform. The antenna pointing direction is biased in a direction which provides a best signal quality, and the bias used to determine antenna boresight calibration factors. The boresight correction factors can be used for open loop pointing.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: May 15, 2007
    Assignee: L3 Communications Corp.
    Inventors: James B. Webster, Jr., LaMar K Timothy, Fred M. Strohacker