Including Directive Communication System Patents (Class 342/367)
  • 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
  • Patent number: 7218955
    Abstract: The purpose of the present invention is to provide a tilt angle deciding method and a system wherein tilt angles to diminish the deterioration rate of the entire system can be obtained in the radio communication system. The method comprises the steps of setting initial values of tilt angles; calculating the deterioration rate at the initial values of tilt angles; selecting an antenna for reducing a tilt angle; reducing the tilt angle of the selected antenna; calculating a deterioration rate at the time when the tilt angle is reduced; determining the continuity of repeating the processes, after repeating the series of processes for reducing these tilt angles, and increasing tilt angles repeatedly in the similar way. In addition, the method comprises the steps of outputting tilt angles for diminishing a small deterioration rate, and determining whether the processes of repeating the whole steps finish.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: May 15, 2007
    Assignee: NEC Corporation
    Inventors: Akio Aoyama, Kojiro Hamabe
  • Patent number: 7215297
    Abstract: An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: May 8, 2007
    Assignee: IPR Licensing, Inc.
    Inventors: Griffin K. Gothard, Alton S. Keel, Jr., Christopher A. Snyder, Bing Chiang, Joe T. Richeson, Douglas H. Wood, James A. Proctor, Jr., Kenneth M. Gainey
  • Patent number: 7129890
    Abstract: A method, a node and a machine-readable medium are provided for dynamically adjusting a beam of an adaptive antenna array (302). A receiving node (101) receives, via a group of antenna array elements (302), a signal from a transmitting node (101). Each received signal from the antenna array elements (101) is digitized and recorded. K+1 output signals are generated from the recorded digitized signal. The k+1 output signals are generated by applying each of a group of weight sets to the recorded digitized signal. Each of the weight sets corresponds to a different one of k known neighboring nodes (101) and a weight set for generating an omnidirectional propagation pattern. Which one of the k+1 output signals to process is determined. The determined one of the k+1 output signals is processed and the packet encoded in the determined one of the k+1 output signals is decoded.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: October 31, 2006
    Assignees: Verizon Corporate Services Group Inc., BBN Technologies Corp.
    Inventors: Jason Keith Redi, Stephen R. Kolek
  • Patent number: 7127182
    Abstract: A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical radiation. The modulator unit is also in communication with the source of complex non-information signals. The modulator has an input adapted to receive information-bearing signals.
    Type: Grant
    Filed: October 16, 2002
    Date of Patent: October 24, 2006
    Assignee: Broadband Royalty Corp.
    Inventors: Paul J. Matthews, Paul D. Biernacki, Sandeep T. Vohra
  • Patent number: 7085541
    Abstract: A node (105-1) determines a power level for transmitting to a neighboring node (105-2) in a wireless network (100). The node (105-1) receives one or more messages indicating a location of the neighboring node and a type of directional antenna of the neighboring node (105-2) that transmitted the one or more messages. The node (105-1) determines the power level for transmitting to the neighboring node (105-2) based on the location of the neighboring node (105-2) and the type of the directional antenna.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: August 1, 2006
    Assignee: BBNT Solutions LLC
    Inventors: Jason Keith Redi, Keith William Manning, Mitchell Paul Tasman
  • Patent number: 7075902
    Abstract: The present invention provides a method, apparatus, and a computer program product for selective directional wireless communication. The apparatus comprises a computer system with a directional communication module. The present invention takes advantage of directional antennas in order to optimize wireless communication by minimizing interference with neighboring nodes. The technique presented is a CSMA/CA-based reservation protocol that improves the multiple access throughput of a wireless ad-hoc network by efficiently utilizing the interference reduction feature of switched-beam antennas by balancing the number of neighbors that need to back-off and the number of control/data packet collisions.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: July 11, 2006
    Assignee: HRL Laboratories, LLC
    Inventor: Tamer El Batt
  • Patent number: 7062294
    Abstract: A method, device, and machine readable medium to communicate from a base station having a smart antenna system to a user terminal. The method includes providing a downlink channel for transmitting downlink data from the base station to the user terminal, providing an associated channel for the base station to receive an uplink response signal from the user terminal in response to the downlink data. The associated channel is associated, and has a predefined relationship, with the downlink channel. The method further includes providing an uplink data channel, distinct from the associated uplink channel, for the base station to receive uplink data from the user terminal.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: June 13, 2006
    Assignee: ArrayComm, LLC.
    Inventors: Roger Rogard, Michael Youssefmir, Bjorn Erik Ottersten
  • Patent number: 7061427
    Abstract: A technique for steering a directional antenna such as may be used in a Wireless Local Area Network (WLAN) device. The technique detects signal parameters during reception of short sync pulses in the very beginning portion of a Packet Protocol Data Unit (PPDU) frame. As a result, the antenna can be steered to an optimum direction for reception prior to receiving other portions of a preamble that may be needed to acquire carrier signal phase and frequency.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: June 13, 2006
    Assignee: IPR Licensing, Inc.
    Inventors: John E. Hoffmann, George Rodney Nelson, Jr., John A. Regnier, Kevin P. Johnson
  • Patent number: 7054664
    Abstract: The disclosed embodiments relate to a system and method for providing user specific beams in a fixed beam network, the fixed beam network comprising a plurality of fixed beams, each of the plurality of fixed beams being defined by a plurality of fixed beam correlation coefficients. The system may comprise a device that computes reception correlation data for a received signal, and a beamformer that is adapted to determine transmission weighting coefficients to be applied to a return signal based on the difference between the reception correlation data and the fixed beam weighting coefficients associated with at least one of the plurality of fixed beams.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: May 30, 2006
    Assignee: Lucent Technologies Inc.
    Inventor: Shirish Nagaraj
  • Patent number: 7046965
    Abstract: A radio receiver is provided with a beam-width-variable antenna that receives a radio signal and is capable of changing the beam-width; an interference canceler for removing interference waves from the received radio signal and outputting an interference-wave-removed signal; a measuring device for measuring reception quality of the received signal based on the interference-wave-removed signal; and a beam-width controller for controlling the beam-width of the beam-width-variable antenna based on the reception quality from the measuring device.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: May 16, 2006
    Assignee: NTT DoCoMo, Inc.
    Inventors: Koji Maeda, Yuji Aburakawa, Toru Otsu
  • Patent number: 7034759
    Abstract: An adaptive antenna used in a receive only mode with a separate omnidirectional transmit antenna. The arrangement is especially effective for small, handheld wireless devices. The transmit antenna maybe integrated with the receive array by utilizing a horizontally polarized transmit and vertically polarized receiver ray. In other embodiments, the transmit antenna may be physically separate and not integrated with the receive array. In either case there is separate receive and transmit signal port as an interface to radio transceiver equipment. The use of an adaptive antenna in the receive only direction has the potential to increase forward links capacity to levels equal to or greater than reverse link capacity. This allows for a significant increase in the overall number of users that may be active at the same time in a wireless system.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: April 25, 2006
    Assignee: IPR Licensing, Inc.
    Inventors: James A. Proctor, Jr., Bing Chiang
  • Patent number: 7010304
    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: September 23, 2002
    Date of Patent: March 7, 2006
    Assignee: Cingular Wireless II, LLC
    Inventors: Ming Zhang, Alan Denis MacDonald
  • Patent number: 6999794
    Abstract: A method and apparatus are provided that allows beamforming to be used on a user-specific signal together with a sector-wide pilot signal in a communication system, such as a CDMA system. In one embodiment, the invention includes a plurality of elements in a defined order to transmit spatially directed signals to specific receiving radio terminals, and a single element, substantially in the center of the ordering to transmit a single pilot signal simultaneously to a plurality of receiving radio terminals.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: February 14, 2006
    Assignee: ArrayComm LLC
    Inventors: Erik D. Lindskog, Mitchell D. Trott
  • Patent number: 6989797
    Abstract: An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: January 24, 2006
    Assignee: IPR Licensing, Inc.
    Inventors: Griffin K. Gothard, Alton S. Keel, Jr., Christopher A. Snyder, Bing Chiang, Joe T. Richeson, Douglas H. Wood, James A. Proctor, Jr., Kenneth M. Gainey
  • Patent number: 6968212
    Abstract: Priority determining section 107 determines priority of each communication terminal apparatus based on the information indicating the channel quality of the downlink. Transmission destination determining section 108 estimates the direction in which each communication terminal apparatus exists from the information indicating the direction of arrival of the signal and determines the communication terminal apparatuses to which downlink high-speed packet transmission is performed based on the direction in which each communication terminal apparatus exists and priority. AAA transmission control section 154 calculates a transmission weight based on the direction of arrival of the signal sent from the communication terminal apparatus determined by transmission destination determining section 108. Then, AAA transmission control section 154 multiplies the signals sent from antenna elements 101 to 103 by transmission weights.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: November 22, 2005
    Assignee: Matsushita Electric Industrial CO, Ltd.
    Inventors: Takahisa Aoyama, Kenichi Miyoshi, Toyoki Ue
  • Patent number: 6963305
    Abstract: This invention makes it possible to communicate through solid non-metallic walls or ceilings with low microwave power levels. RF beam forming couplers are driven by common networks. For connection to a LAN segment at the other side of a wall or ceiling, transceiver 4 transmits data modulated microwave RF to coupler 6 through a directional step attenuator 10. The reduced signal is received by the coupler system at the other side with a power level low enough to eliminate wireless detection from the outside. However, the directional step attenuator on the receive side reduces the signal power only by an insignificant amount due to its low directional losses during receive signal flow. Each coupler's geometry is minimizing the radiation exposed material volume by RF field concentration, therefore, enabling transmission through thick concrete walls at microwave frequencies without compromising privacy. When used as wireless access point, coupler transmits through a floor to wireless devices below.
    Type: Grant
    Filed: October 2, 2002
    Date of Patent: November 8, 2005
    Inventor: Guenther Knapp
  • Patent number: 6959047
    Abstract: The burden of designing multiple training sequences for systems having multiple transmit antennas, is drastically reduced by employing a single sequence from which the necessary multiple sequences are developed. The single sequence is selected to create sequences that have an impulse-like autocorrelation function and zero cross correlations. A sequence of any desired length Nt can be realized for an arbitrary number of channel taps, L. The created sequences can be restricted to a standard constellation (that is used in transmitting information symbols) so that a common constellation mapper is used for both the information signals and the training sequence. In some applications a a training sequence may be selected so that it is encoded with the same encoder that is used for encoding information symbols. Both block and trellis coding is possible in embodiments that employ this approach.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: October 25, 2005
    Assignee: AT&T Corp
    Inventors: Naofal Al-Dhahir, Christine Fragouli, William Turin
  • Patent number: 6850741
    Abstract: A scheme for selecting two beams in a switched beam antenna system for providing downlink communications in a downlink channel, the switched beam antenna system providing uplink reception and downlink transmission is described. The scheme involves selecting a pair of beams based on the uplink reception of the switched beam antenna system, and determining from the pair of beams a corresponding pair of orthogonal beams. The scheme also involves providing the pair of orthogonal beams as a pair of transmit beams for the downlink transmission of the switched beam antenna system.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: February 1, 2005
    Assignee: Agency for Science, Technology and Research
    Inventors: Zhongding Lei, Po Shin Francois Chin, Ying Chang Liang
  • Patent number: 6845244
    Abstract: The present invention relates to a method for adaptively controlling a transmission radiation pattern. Radio signals coming through a plurality of paths are received and demodulated for each path. The received level or received quality of each demodulated signal is compared to each other to select a signal with the highest level or most excellent quality. A path corresponding to a selected path is set at a path for transmission. When a plurality of signals each with an almost equal level or received quality exists in signals demodulated for each path, a history of transmission power control command (TPC) transmitted from a communication partner is referred. In other words, the reception condition in a communication partner is checked. Thereby, it is judged whether or not the currently selected path is appropriate as the path for transmission.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: January 18, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Minako Ide, Katsuhiko Hiramatsu
  • Patent number: 6836242
    Abstract: Disclosed is a method, apparatus and a computer readable media that provide an ability for a first platform and a second platform to obtain information that is descriptive of a relative location of the other. The method includes establishing an initial antenna pointing direction of the first and second platforms such that the pointing directions are opposite one another, and incrementally scanning each antenna in azimuth in the same direction in synchronism with one another in a plane referenced to a common reference plane until each antenna is within the other antenna's azimuth and elevation beamwidth during a scanning increment dwell time (TDWELL). Upon completing a scan in azimuth in the plane, the method changes an elevation angle of each antenna pointing direction relative to the plane by equal and opposite amounts, and repeats the incremental scanning of each antenna in azimuth in the same direction.
    Type: Grant
    Filed: February 19, 2004
    Date of Patent: December 28, 2004
    Assignee: L-3 Communications Corporation
    Inventors: Patricia F. Batzer, Merle L. Keller
  • Patent number: 6836674
    Abstract: Disclosed is a control apparatus capable of more effectively utilizing radio resources. Mobile stations positioned close to each other are treated as one group, and a direction and width (radiation angle) of a beam radiated from an adaptive array antenna 11 is controlled for each group so that one beam capture one group. To be concrete, a plurality of mobile stations are classified into groups by a classification section 19, and an area to which each group moves is estimated by a directivity determination section 20. The adaptive array antenna 11 is controlled by the directivity control section 15 so that one beam can cover an area in which one group is positioned and the area to which this one group moves.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: December 28, 2004
    Assignees: Hitachi, Ltd., KDDI Corporation
    Inventors: Tsuyoshi Taniguchi, Tatsuto Okamoto, Satoshi Masuda, Toshiro Suzuki, Takashi Inoue, Sumaru Niida
  • Patent number: 6816115
    Abstract: A system selects an antenna for transmitting data from a node (105-1) in an ad-hoc, multi-hop, wireless network (100). The system receives a message from another node (105-2) of the wireless network (100), the message including location data associated with the other node (105-2). The system determines an angle from the node (105-1) to the other node (105-2), based on the location data, to produce a determined angle. The system selects an antenna from a plurality of antennas for transmitting data to the other node (105-2) based on the determined angle.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: November 9, 2004
    Assignee: BBNT Solutions LLC
    Inventors: Jason Keith Redi, Keith William Manning, Mitchell Paul Tasman
  • Patent number: 6792290
    Abstract: An antenna apparatus that can increase capacity in a cellular communication system. The antenna operates in conjunction with a mobile subscriber unit and provides a plurality of antenna elements, each coupled to a respective signal control component such as a phase shifter. The phase shift for each antenna element is programmed for optimum reception during, for example, an idle mode when a pilot signal is received. The antenna array creates a beam former for signals to be transmitted from the mobile subscriber unit, and a directional receiving array to more optimally detect and receive signals transmitted from the base station. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference. The phase shifters are adjusted in a coarse and a fine mode. In the coarse mode all phase shifters are jointly incremented through several phase shift values until a signal quality metric is optimized.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: September 14, 2004
    Assignee: IPR Licensing, Inc.
    Inventors: James Arthur Proctor, Jr., Lawrence Wayne La Mont, Jr., George Rodney Nelson, Jr., Kenneth Marvin Gainey
  • Publication number: 20040176137
    Abstract: From received digital signals and a reference signal, a response vector computing unit computes a received response vector as a received response characteristic of the received signals against a transmission signal. The received response vector computed by the response vector computing unit is stored in a desired terminal response vector table. A virtual response vector for a virtual interception terminal apparatus is stored in a virtual intercepting terminal response vector table. A transmission weight vector computing unit computes a transmission weight vector necessary for weighting a transmission information signal from the received response vector and the virtual response vector, using a Wiener solution. A multiplication unit weights the transmission information signals with the respective transmission weight vectors so as to output transmission digital signals.
    Type: Application
    Filed: February 19, 2004
    Publication date: September 9, 2004
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventor: Yoshiharu Doi
  • Patent number: 6785559
    Abstract: A communication system transmits and receives communications within a sectorized cell between at least one primary station and at least one secondary station. The communication system includes a unit for generating and shaping a beam; an antenna for transmitting and receiving signals within said beam; and a unit for directing the beam. The shaped beam is directed at a plurality of predetermined directions; either continuously or discretely.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: August 31, 2004
    Assignee: InterDigital Technology Corporation
    Inventors: Steven Goldberg, Angelo Cuffaro
  • Patent number: 6781543
    Abstract: The direction-of arrival estimation by means of a subspace-based algorithm such as MUSIC or ESPRIT is formed by using reduced-bandwidth signals as compared with communication signal waves. The narrower-bandwidth signals is obtained by each mobile telephone transmitting a modulated version of a lower-transmission rate test signal as well as a communication signal wave or by band-pass filtering the received communication signal waves in a base station. A direction-of-arrival estimation is formed by using a reduced number of signals for the direction-of arrival estimation. The number of direction-of-arrival estimating signals is reduced by discarding a part of the received signals, by multiplexing the received signals by the sub-array and forming a direction-of arrival estimation for each sub-array, or by using an additional array antenna having a reduced number of elements.
    Type: Grant
    Filed: November 1, 2001
    Date of Patent: August 24, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Youichi Nakagawa, Takashi Fukagawa, Makoto Hasegawa
  • Patent number: 6768453
    Abstract: An array antenna system with an electrically large array antenna comprises first and second antenna subarrays and, a combination transmission line network, which has an input for receiving an antenna line signal and outputs connected with the first and second antenna subarrays. The combination line network contains a phase shifting device for generating a phase displacement between output signals of the first output and of the second output before their feeding to the antenna subarrays; and devices are provided to compensate the phase displacement in the beam path of the antenna radiation emitted by the antenna subarrays.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: July 27, 2004
    Assignee: Eads Deutschland GmbH
    Inventor: Klaus Solbach
  • Patent number: 6731954
    Abstract: The invention relates to a method of improving radio connection (170) quality in a cellular radio network and a cellular radio network. The cellular radio network comprises a vase station system (126) and subscriber terminals (150). Between the base station system (126) and the subscriber terminal (150) there is a bidirectional radio connection (170) using a directional antenna beam (304, 306). In the method, a direction of arrival (302A) of the antenna beam (304A) directed on the basis of a radio signal (304A) received uplink, transmitted by the subscriber terminal (150) is formed in the base station system (126). The base station system (126) transmits a radio signal (306) downlink to the subscriber terminal (150) in the direction of transmission (308) formed on the basis of the direction of arrival (302A). In forming the direction of transmission (308) a preknown number (L) of previously formed directions of arrival (402, 302C, 302B, 302A) are utilized.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: May 4, 2004
    Assignee: Nokia Corporation
    Inventor: Marcos Katz
  • Patent number: 6728294
    Abstract: A microprocessor reads the information such as directions of arrival about a desired wave and an undesired wave for every terminal station and for every hopping frequency, and their receiving powers, and the like, from a desired wave/undesired wave information inputting unit. On the basis of the information items, the microprocessor calculates the weight values of a transmitting section and a receiving section for every terminal station and every hopping frequency, and stores them in a weight value table. At the time of performing radio communication, the microprocessor reads the weight values of the receiving section and the transmitting section corresponding to every terminal station and every hopping frequency from the weight value table every time the frequency is hopped, and sets them in attenuators, and phase shifters. As a result, the optimum directivity pattern is formed for every hopping frequency, and high-quality communication can be thereby achieved.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: April 27, 2004
    Assignees: Toshiba Tec Kabushiki Kaisha
    Inventors: Ryuji Kohno, Hiroki Mochizuki
  • Patent number: 6718184
    Abstract: A method for processing signals from multiple receiving/transmitting elements that define an array antenna is disclosed. The method includes measuring uplink signals from the elements of the array antenna to form a directional downlink antenna response. A first covariance matrix between pairs of uplink signals is determined for desired signal components of the measured uplink signals. A second covariance matrix is determined for noise and interference components of the measured uplink signals. An antenna processing system computes adaptive weights based on the first covariance matrix, the second covariance matrix and a loading term to in effect form a directional downlink radiation pattern. The loading term represents a balance adjustment between a first performance rating of a particular coverage area versus second performance rating of the wireless communication system.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: April 6, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Richard Thomas Aiken, Dennis Raymond Morgan
  • Patent number: 6686879
    Abstract: Principles of quantum interferometry are used to create a signal architecture (known as carrier interferometry) for wireless and waveguide electromagnetic-wave communications. Carrier interferometry provides unprecedented bandwidth efficiency and enables substantial improvements in interference rejection, power efficiency, and system versatility. The carrier interferometry architecture also enables simpler transceiver designs that facilitate digital up-conversion and down-conversion.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: February 3, 2004
    Assignee: Genghiscomm, LLC
    Inventor: Steve J. Shattil
  • Publication number: 20040017310
    Abstract: A wireless communication base station consistent with certain embodiments of the present invention collects user transmissions and creates and maintains a database storing data that relates communication parameters to a geographic location. A base station receiver receives data packets containing data describing a geographic location of a mobile communication node. The base station predicts a future geographic location of the mobile communication node, and transmits communication parameters to the mobile communication node associated with the predicted future geographic location. The mobile communication node consistent with certain embodiments of the invention has a GPS positioning device that determines a geographic location of the communication node. A transceiver transmits data representing the geographic location and receives data representing communication parameters determined as a function of the data representing the geographic location.
    Type: Application
    Filed: July 24, 2002
    Publication date: January 29, 2004
    Inventors: Sarah Vargas-Hurlston, Paul Robert Runkle
  • Publication number: 20030227409
    Abstract: Method and antenna system used to point at least an antenna with respect to one or more other antennas, one of the antennas being a transmission antenna with an opening beam &thgr;e associated with a rotation speed Re, to cover an angular sector Se transmitting a signal every Tb seconds and another antenna being a reception antenna with an opening beam &thgr;r associated with a rotation speed Rr to cover an angular sector Sr, comprising at least the following steps
    Type: Application
    Filed: December 9, 2002
    Publication date: December 11, 2003
    Inventor: Gerard Auger
  • Patent number: 6650289
    Abstract: Methods and systems for increasing the potential capacity of point to point communication between two sites within line of sight of each other are disclosed. Two antennas at each of the two sites are configured geometrically to approximately provide a desired value for a function of signal electrical phase differences so as to allow differentiation of transmitted signal. Capacity is thereby increased compared to a system with one antenna at each site.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: November 18, 2003
    Assignee: Microwave Networks Incorporated
    Inventors: Shmuel Levy, Noam Livneh, Ori Stern, Ami Saguy
  • Patent number: 6621454
    Abstract: A system for mitigating the effects of interference in an unlicensed RF band for point to point data transmissions comprises a multibeam antenna locating interference with transmission to and from data transmission subscribers. A scanner determines the frequency, bandwidth and any periodicity of the interference. Separate scanners can be used for each antenna beam. Nulls are generated in the data transmission antenna pattern in the direction of the interference during periods of interference. Communications with subscribers in a direction of the interference is carried out using a different channel or is scheduled around the interference occurrences. Alternatively, such subscribers are directed to establish data transmissions with an alternate hub antenna.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: September 16, 2003
    Assignee: Vectrad Networks Corporation
    Inventors: Mark D. Reudink, Bruce C. Rothaar, Jerry Prismantas
  • Publication number: 20030169201
    Abstract: A method of tracking a signal from a moving signal source including commanding angular offsets to control an antenna to track a signal from a moving signal source taking into consideration directional changes of the signal and comparisons between actual and estimated trajectories of the moving signal source.
    Type: Application
    Filed: March 11, 2002
    Publication date: September 11, 2003
    Inventors: Robert B. Dybdal, Denny D. Pidhayny
  • Patent number: 6606058
    Abstract: A beamforming method and device for adaptive antenna arrays including several antenna elements (1.1. to 1.M) in the downlink of frequency duplex systems, wherein antenna weights (Wk(fS)) are determined for the antenna elements (1.1 to 1.M) for downlink transmission on the basis of directional information of the uplink; in detail, the antenna weights (Wk(fS)) for downlink transmission are determined on the basis of the power angle spectrum (APSk) of the uplink of the individual users (B1 to BK), wherein the power angle spectrum (APSk) is modified by masking out undesired regions.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: August 12, 2003
    Assignee: Nokia Networks Oy
    Inventors: Ernst Bonek, Klaus Hugl
  • Patent number: 6593880
    Abstract: A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver. The system can be optimized by applying partially adaptive processing algorithms, which are seeded by geo-location data.
    Type: Grant
    Filed: November 9, 1998
    Date of Patent: July 15, 2003
    Assignee: TeraTech Corporation
    Inventors: Scott R. Velazquez, Steven R. Broadstone, Alice M. Chiang
  • Patent number: 6580394
    Abstract: In a communication device that includes an antenna array including multiple antennas, a method and apparatus is provided for determining whether to employ an antenna array beamforming technique. The communication device determines a bearing from the communication device to the communication unit and a direction of arrival for a signal received from the communication unit by the communication device via each of the multiple antennas. In addition, the communication device determines a distance from the communication device to the communication unit, and also determines multiple signal quality metrics based on multiple signals received by the communication device from the communication unit. The communication device then determines whether to employ an antenna array beamforming technique based on any one or more of the determined bearing and the determined direction of arrival, the determined distance, or the determined signal quality metrics.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: June 17, 2003
    Assignee: Nokia Networks Oy
    Inventors: Shu-Shaw Wang, R. Thomas Derryberry
  • Publication number: 20030064753
    Abstract: A system and related methods for beamforming in a multi-point communication environment is presented. According to one aspect of the invention, a method comprising identifying one or more spatial signature attributes associated with each of a plurality of targets in a wireless communication system, and assigning one or more of the plurality of targets into a cluster based, at least in part, on the identified one or more spatial signature attributes, wherein the target(s) populating a cluster will each share wireless communication channel(s).
    Type: Application
    Filed: September 28, 2001
    Publication date: April 3, 2003
    Inventors: Athanasios A. Kasapi, Jun Zhan, Jason Liu
  • Patent number: 6518920
    Abstract: An antenna apparatus which can increase capacity in a cellular communication system. The antenna operates in conjunction with a mobile subscriber unit and provides a plurality of antenna elements, each coupled to a respective programmable phase shifter. The phase of each antenna element is programmed for optimum reception during, for example, an idle mode which receives a pilot signal. The antenna array creates a beamformer for signals to be transmitted from the mobile subscriber unit, and a directional receiving array to more optimally detect and receive signals transmitted from the base station. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference. Various techniques for determining the proper phase of each antenna element are accommodated.
    Type: Grant
    Filed: August 28, 2001
    Date of Patent: February 11, 2003
    Assignee: Tantivy Communications, Inc.
    Inventors: James A. Proctor, Jr., Kenneth M. Gainey
  • Patent number: 6512481
    Abstract: A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: January 28, 2003
    Assignee: TeraTech Corporation
    Inventors: Scott R. Velazquez, Steven R. Broadstone
  • Patent number: 6507319
    Abstract: An antenna includes a lower plate assembly having at least one antenna port and including a beamformer which provides a uniform excitation on the first surface of the lower plate assembly in response to a signal fed to the at least one antenna port and an upper plate having a radiating aperture, the upper plate movably disposed on the first surface of the lower plate assembly to couple energy from the beamformer in the lower plate assembly to a plurality of radiating elements, wherein the position of the upper plate relative to the lower plate determines a scan angle of the antenna.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: January 14, 2003
    Assignee: Raytheon Company
    Inventor: Thomas V. Sikina
  • Patent number: 6504506
    Abstract: A receiving device and method for operating a communication system are provided. The receiving device receives at least one Doppler channel estimate for at least one transmitter and a spatial covariance matrix of a corrupting environment. The Doppler channel estimates are used to create a Null Doppler spatial covariance matrix. A total Doppler spatial covariance matrix is created as a sum of the spatial covariance matrix of the corrupting environment, plus the Doppler spatial covariance matrix. A combining weight for at least one transmitter and at least one Doppler channel is created from the total Doppler spatial covariance and the at least one Doppler channel for the at least one transmitter.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: January 7, 2003
    Assignee: Motorola, Inc.
    Inventors: Timothy A. Thomas, Frederick W. Vook
  • Patent number: 6483458
    Abstract: A method for accurately tracking and communicating with a satellite from a mobile platform, wherein the satellite has an antenna which performs both transmit and receive functions from a single antenna aperture. The method involves using an inertial reference unit (IRU) of the mobile platform to initially acquire the signal from the satellite. A sequential lobing process is then used to more accurately center the antenna aperture relative to the receive beam from the satellite. The antenna is then used to transmit data or other information, and the antenna pointing is maintained by an additional IRU local to the antenna with higher accuracy and lower latency than the IRU of the mobile platform. Periodically, transmissions from the antenna are inhibited and the sequential lobing process is repeated to eliminate for any inertial reference drift error.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: November 19, 2002
    Assignee: The Boeing Company
    Inventor: Ronald Steven Carson