Angle Modulation Patents (Class 375/271)
  • Patent number: 9847900
    Abstract: A receiver for detecting and recovering payload data from a received signal comprises a radio frequency demodulation circuit configured to detect the received signal. The received signal has been formed and transmitted by a transmitter to carry the payload data as Orthogonal Frequency Division Multiplexed (OFDM) symbols in one or more of a plurality of time divided frames, each frame including a preamble including a plurality of bootstrap OFDM symbols. One or more of the bootstrap OFDM symbols of the preamble carrying signalling data represented as a relative cyclic shift of a signature sequence which has been combined with the one or more of the bootstrap OFDM symbols. A bootstrap processor is configured to detect the signalling data from the bootstrap OFDM symbols using an estimate of the channel transfer function determined from one or more of the bootstrap OFDM symbols, and a demodulator circuit is configured to recover the payload data from the payload OFDM symbols using the signalling data.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: December 19, 2017
    Assignee: SONY CORPORATION
    Inventor: Samuel Asangbeng Atungsiri
  • Patent number: 9729194
    Abstract: To provide a clock control circuit, a demodulation device, and a spread spectrum method, which can reduce interference caused by a clock signal on which spread spectrum is performed when demodulating a signal. A clock controller 22 according to the present invention disperses a harmonic of a clock signal in a used frequency band of a reception signal and controls a harmonic remaining in the used frequency band after the dispersion. For example, the clock controller 22 controls an amplitude of the harmonic on the basis of a spread frequency used for the dispersion and a spread width of the harmonic.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: August 8, 2017
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Atsushi Nakamura, Masahiro Toyama, Masafumi Watanabe, Kota Toida, Aya Ohmae, Wen Li
  • Patent number: 9560477
    Abstract: A wireless communication device (WCD) establishes an ad-hoc communication link with a second WCD within operating range. A replica of at least a portion of a display of the first WCD may be shared with the second WCD utilizing wireless broadband signals that are communicated via the established one or more ad-hoc communication links. The first WCD and the second WCD are operable to communicate the wireless broadband signals at a power level that is below a spurious emissions mask. The transmitted wireless broadband signals are spread so they occupy a designated frequency spectrum band. The shared replica of at least a portion of the display of the first WCD includes one or more applications, text, video and/or data content. A user of the first WCD may interact with content that is displayed on a display of the second WCD and vice-versa.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: January 31, 2017
    Assignee: MAXLINEAR, INC.
    Inventors: Curtis Ling, Timothy Gallagher
  • Patent number: 9531439
    Abstract: An electronic device with touch-link functionality includes a touch panel, a signal processing circuit and a controller. The touch panel includes a first transmitting electrode for transmitting a first signal. The signal processing circuit provides the first signal to the first transmitting electrode. The first signal has a first frequency that is adjustable. The controller is coupled to the touch panel and the signal processing circuit. The controller adjusts the first frequency to make the first frequency correspond to an effective communications range. Within the effective communications range, another electronic device with touch-link functionality is able to receive the first signal, whereas outside the effective communications range, the another electronic device with touch-link functionality is unable to receive the first signal.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: December 27, 2016
    Assignee: MEDIATEK INC.
    Inventors: Chung-Jen Kuo, Po-An Chen
  • Patent number: 9042479
    Abstract: Apparatuses and methods for avoiding interference between wireless systems are described herein. One embodiment of the disclosure provides an apparatus for avoiding interference between at least one transmitter and at least one receiver within at least one wireless device. The apparatus comprises a first processing circuit configured to determine whether one or more bins are affected by interference from a transmitter based on predetermined information.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: May 26, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Alecsander Eitan
  • Patent number: 9025684
    Abstract: Disclosed is a method for generating and transmitting a reference signal in a clustered DFT-spread OFDM transmission scheme. A method for generating and transmitting a DM-RS in a clustered DFT-spread-OFDM scheme comprises: a step of generating DM-RS sequences corresponding to the number of clusters allocated for an uplink transmission; and a step of mapping the generated DM-RS sequences to the relevant DM-RS symbol positions for each cluster. Accordingly, the method for generating and transmitting a reference signal according to the present invention, in which DM-RS sequences are allocated and transmitted on a cluster basis, uses a complete DM-RS sequence for each cluster, and therefore inter-cell interference can be weakened, and problems which might occur when applied to a multi-user MIMO (MU-MIMO) scheme can be solved.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: May 5, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung Jang Jeong, Young Jo Ko, Bang-Won Seo, Jae Young Ahn
  • Patent number: 9014289
    Abstract: Disclosed is a method of transmitting dual digital signals through a single antenna. The method includes receiving, by a transmitter, a first data stream and a second data stream which use the same carrier frequency, modulating, by the transmitter, each of the first data stream and the second data stream, lowering, by the transmitter, a power level of the modulated second data stream, combining, by the transmitter, the modulated first data stream and the second data stream with the lowered power level, and transmitting, by the transmitter, the added first data stream and second data stream to a single antenna in the same channel.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: April 21, 2015
    Assignee: GCT Semiconductor, Inc.
    Inventors: Eal Wan Lee, Dae Hong Kim, Jeong Min Kim
  • Patent number: 9008163
    Abstract: A vectored-DSL method and system and a board relate to the field of digital subscriber line DSL data processing, so as to increase user capacity of a vectored-DSL system. The vectored-DSL method includes: receiving, by at least one board, and pre-processing user data of the board; transmitting, by the board, the user data of the board to an auxiliary vector processor on the board to perform internal vectorization processing, so as to obtain internally processed data; transmitting, by the board, the user data thereof to a centralized vector processor to perform external vectorization processing, so as to obtain externally processed data; and receiving, by the board, the externally processed data of the board, and post-processing the externally processed data and the internally processed data.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: April 14, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Ruijie Xiao, Huishen Dong, Cheng Li, Jinxiong Lv, Jianwei Ke
  • Patent number: 8995844
    Abstract: An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: March 31, 2015
    Assignee: Teradvance Communications LLC
    Inventors: Marcel F. C. Schemmann, Zoran Maricevic, Antonije R. Djordjevic, Darby Racey
  • Patent number: 8995919
    Abstract: In at least one embodiment, a method includes receiving a first transmission from a device, the first transmission transmitted at a first frequency. In response to receiving the first transmission, a transceiver is disabled and a second transmission is transmitted to the device, the second transmission transmitted at a second frequency. The method further includes receiving a third transmission from the device, the third transmission transmitted at the second frequency.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: March 31, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Randy Zimler, George B. Bolam, James A. Worsham, Jr.
  • Patent number: 8988993
    Abstract: A wireless transmission system including antenna pairs, a demodulation functional unit, and a transmission characteristic correction unit. The antenna pairs include transmission and reception antennae. A desired wave arrives at a reception antenna in a wireless signal from one transmission antenna. Meanwhile, the reception antenna receives an unnecessary wave in a wireless signal transmitted from a different transmission antenna. The demodulation functional unit corresponding to each antenna pair demodulates a signal received by the reception antenna. The transmission characteristic correction unit carries out correction calculation based on a transmission characteristic of a transmission space between the transmission and reception antennae based on demodulation signals demodulated by the demodulation functional units to acquire an output signal corresponding to a transmission subject signal.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: March 24, 2015
    Assignee: Sony Corporation
    Inventor: Norihito Mihota
  • Patent number: 8948291
    Abstract: A radio communication apparatus operable over a wide range of frequencies including a signal processing device is provided. The device performs an analog to digital conversion at a predetermined sample rate independent of a selected frequency band within the wide range of frequencies to generate a digital signal, and digitally processes the digital signal to output a data signal at baseband associated with the selected frequency band.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: February 3, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Bradley John Morris, Lars Johan Thorebäck
  • Patent number: 8942308
    Abstract: A multi-level coding and iterative decoding scheme using sparse space codes as the inner-code and codes amenable to belief propagation decoding methods (such as low-density parity-check (LDPC) codes, turbo codes, and trellis codes) as the outer-code is proposed for MIMO communication channels.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: January 27, 2015
    Assignee: BlackBerry Limited
    Inventors: Sagar Dhakal, Thomas Aloysius Sexton, Alireza Bayesteh, Steve Hranilovic
  • Patent number: 8929285
    Abstract: A system and method for providing the ability to discover the capabilities of a user's computer to determine whether it is capable of supporting more than one wireless protocol simultaneously is provided. A computing device's capabilities (including, for example, hardware and/or software capabilities) is checked to determine if it supports at least two specific wireless protocols and checking a computing device's capabilities (including, for example, hardware and/or software capabilities) is checked to determine if it supports both wireless protocols simultaneously. The techniques for determining the computing device's compatibility may include comparing lists of protocol requirements to lists of system capabilities and/or generating test signals by the system according to the protocol.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: January 6, 2015
    Assignee: Microsoft Corporation
    Inventors: Amer A. Hassan, Deyun Wu, Hui Shen, Christian Huitema, Thomas W. Kuehnel
  • Publication number: 20140334568
    Abstract: A communication device is provided that readily increases the communication capacity of communication data based on a given protocol, without increasing the number of wired connections. The communication device sends and receives communication data through a communication line. A transmitting section sends a communication signal of modulated communication data to the communication line. A receiving section demodulates a communication signal received from the communication line to obtain communication data The transmitting section modulates the communication data on the basis of a frequency that varies dynamically within a predetermined transmission frequency band. The receiving section demodulates the received modulated communication signal corresponding to the transmission frequency band, to obtain the communication data.
    Type: Application
    Filed: November 26, 2012
    Publication date: November 13, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideki Gotou, Shinichi Iiyama, Takashi Yasuda, Keigo Takahashi, Tsutayuki Shibata
  • Patent number: 8885759
    Abstract: A noise and interference tolerant bit communication system, which requires no conventional modulation/demodulation, with its' associated digital-hardware-implemented mechanisms for bit transmission, bit reception, and channel balancing; are presented, where electrical, photonic, or EM pulses (signals); representing binary information bits; are carried from a transmitter point over an (Nx2)-channel transmission medium, to a receiver point. The binary value of a transmitted pulse is identified at the receiver by means of the actual channel the pulse is travelling through. For example, if at a given time, any pulse transmitted and received through the first channel represents logic one, while any pulse transmitted and received through the second channel represents logic zero; thus reducing pulse's binary state representation per channel from two to one. The proposed system is capable of error-free communication at any signal-to-noise plus interference ratio value greater than zero.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: November 11, 2014
    Inventor: Fahad S H Z Alkhaled
  • Publication number: 20140328427
    Abstract: Various embodiments of systems for transmitting and receiving digital and/or analog signals across a single isolator, solid state lighting systems, or DC/DC converter feedback regulation control systems are disclosed. In one embodiment, a first signal may be modulated into a first modulated signal. The first modulated signal is then modulated into a second modulated signal in accordance to a second signal. The second modulated signal is in turn, modulated into a third modulated signal in accordance to a third signal. At least some of the apparatuses, circuits, systems and methods disclosed herein may be implemented using conventional CMOS design and manufacturing techniques and processes to provide, for example, at least one or more integrated circuits.
    Type: Application
    Filed: July 16, 2014
    Publication date: November 6, 2014
    Inventors: Kwee Chong Chang, Jia Peng, Gek Yong Ng, Kok Keong Richard Lum
  • Patent number: 8873667
    Abstract: The present application relates to embodiments of methods and a device for digital modulation. In a first embodiment of the method, the following steps are executed: determining a polarity of the signal, providing an inverted carrier signal, providing an inverted signal by an inversion of the polarity of at least one portion of the signal, mixing the signal with the carrier signal when the signal has the first polarity, and mixing the inverted signal with the inverted carrier signal when the signal has the second polarity.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: October 28, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Stefan Herzinger, Zdravko Boos
  • Patent number: 8848821
    Abstract: Transmissions are received on a plurality of uplink physical resource blocks. An acknowledgement or negative acknowledgement for each of the received transmissions is mapped to a downlink channel, such that linear increasing sequential indices of the physical resource blocks map to linear increasing sequential indices of n groups of the downlink channel which repeat until all the physical resource blocks are mapped, in which the downlink channel comprises a plurality of n groups.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: September 30, 2014
    Assignee: Nokia Corporation
    Inventors: Lars Erik Lindh, Jussi Kustaa Ojala, Frank Frederiksen
  • Patent number: 8798205
    Abstract: A medical device communication system includes a receiver adapted to receive radio frequency (RF) signals and configured to operate in a first mode to poll for an RF signal for a first time interval to detect an element of a valid input signal during the first time interval. In response to detecting the element of a valid input signal in the first time interval, the receiver operates in a second mode to poll for the RF signal for a second time interval to analyze the RF signal over the second time interval to detect a valid modulation of the RF signal. In response to detecting a valid modulation of the RF signal during the second time interval, the receiver is enabled to establish a communication session with a transmitting device.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: August 5, 2014
    Assignee: Medtronic, Inc.
    Inventors: Robert M. Ecker, James D. Reinke, John R. Ukura
  • Patent number: 8792546
    Abstract: A transmission circuit comprises a ??? modulator to perform ??? modulation of an amplitude modulation component of a modulation signal and to output a pulse width modulation signal, an angle modulator to generate an angle modulation component signal of a signal obtained by multiplying the modulation signal by a transmission output control coefficient corresponding to a transmission output in a power amplifier, and a multiplier to multiply the pulse width modulation signal by the angle modulation component signal and to output a result of the multiplication as an output signal to the power amplifier.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: July 29, 2014
    Assignees: Fujitsu Limited, The University of Elecro-Communications
    Inventors: Kazuo Nagatani, Eisuke Fukuda, Yasushi Yamao
  • Patent number: 8750421
    Abstract: A communications transmitter includes a combination modulator and a baseband processor configured to generate amplitude, angle, in-phase and quadrature signals. The combination modulator is configured to modulate in the quadrature domain or the polar domain, depending on an output power level of the transmitter and/or the type of modulation scheme being used. When configured to modulate in the quadrature domain, the baseband processor is configured to generate time-varying in-phase and quadrature modulating signals and time-invariant amplitude and angle signals for the combination modulator. When configured to modulate in the polar domain, the baseband processor is configured to generate time-varying amplitude and angle modulating signals and time-invariant in-phase and quadrature signals for the combination modulator. In another embodiment of the invention, the communications transmitter is configurable to operate in three different operational modes: linear, envelope tracking and switch modes.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: June 10, 2014
    Inventor: Earl W. McCune, Jr.
  • Patent number: 8737513
    Abstract: An apparatus and a method are disclosed for jointly selecting precoding matrices for a plurality of received transmissions, such as those that might be received from a primary serving cell and a secondary serving cell in a multi-flow radio access network wherein each of the serving cells is configured to provide a MIMO transmission. Here, by jointly selecting the precoding matrices, interference from each of the downlink transmissions upon the other transmission can be reduced, thus improving overall performance at the receiving entity.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: May 27, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Haitong Sun, Danlu Zhang, Sharad Deepak Sambhwani, Rohit Kapoor, Arjun Bharadwaj
  • Patent number: 8737843
    Abstract: An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: May 27, 2014
    Assignee: Teradvance Communications, LLC
    Inventors: Marcel F.C. Schemmann, Zoran Maricevic, Antonije R. Djordjevic, Darby Racey
  • Patent number: 8724526
    Abstract: A system is described for transmitting a communication signal between power lines. The system includes: a transmitter which outputs an OFDM or an FM-OFDM signal at a radio frequency greater than 200 MHz; a first power line which receives the OFDM or the FM-OFDM signal from the transmitter and radiates the OFDM or the FM-OFDM signal from a conductor of the first power line; a second power line which wirelessly receives, by a conductor of the second power line, the OFDM or the FM-OFDM signal radiated from the first power line, and a receiver connected to the second power line which receives the OFDM or the FM-OFDM signal from the second power line.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: May 13, 2014
    Assignee: Satius Holding, Inc.
    Inventors: Charles Abraham, Chris Reinert, John E. Jarels
  • Patent number: 8718157
    Abstract: Codebook based communication of precoding data between two stations involves determining a ‘best fit’ precoding at a receiving station, on the basis of channel state measurements taken therein. The best fit precoding is compared with pre-agreed entries in a codebook, and an indicator is sent back to the terminal emitting the analysed signal. The determination is separated into two elements, one being sufficient for use with SU-MIMO, and another being provided, with a second codebook indicator, if MU-MIMO is to be employed. This second codebook indicator points to a codebook of eigenvector representations for the multi-user space in which the channel is persisting.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: May 6, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Filippo Tosato, Yong Sun
  • Publication number: 20140112408
    Abstract: A medical device communication system includes a receiver adapted to receive radio frequency (RF) signals and configured to operate in a first mode to poll for an RF signal for a first time interval to detect an element of a valid input signal during the first time interval. In response to detecting the element of a valid input signal in the first time interval, the receiver operates in a second mode to poll for the RF signal for a second time interval to analyze the RF signal over the second time interval to detect a valid modulation of the RF signal. In response to detecting a valid modulation of the RF signal during the second time interval, the receiver is enabled to establish a communication session with a transmitting device.
    Type: Application
    Filed: October 22, 2012
    Publication date: April 24, 2014
    Applicant: MEDTRONIC, INC.
    Inventors: Robert M. Ecker, James D. Reinke, John R. Ukura
  • Patent number: 8705644
    Abstract: Disclosed is a method for generating and transmitting a reference signal in a clustered DFT-spread OFDM transmission scheme. A method for generating and transmitting a DM-RS in a clustered DFT-spread-OFDM scheme comprises: a step of generating DM-RS sequences corresponding to the number of clusters allocated for an uplink transmission; and a step of mapping the generated DM-RS sequences to the relevant DM-RS symbol positions for each cluster. Accordingly, the method for generating and transmitting a reference signal according to the present invention, in which DM-RS sequences are allocated and transmitted on a cluster basis, uses a complete DM-RS sequence for each cluster, and therefore inter-cell interference can be weakened, and problems which might occur when applied to a multi-user MIMO (MU-MIMO) scheme can be solved.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 22, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung Jang Jeong, Young Jo Ko, Bangwon Seo, Jae Young Ahn
  • Patent number: 8699610
    Abstract: The present invention relates to a Multi-Input Multi-Output (MIMO) communication system and more particularly, to a method for precoding matrix index (PMI) restriction/recommendation in a multi-cell wireless communication system.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: April 15, 2014
    Assignee: LG Electronics Inc.
    Inventors: Jian Xu, Ja Ho Koo, Bin Chul Ihm, Wook Bong Lee
  • Patent number: 8693564
    Abstract: The present invention relates to a Multi-Input Multi-Output (MIMO) communication system and more particularly, to a method for Correlation matrix feedback in a multi-cell wireless communication system. A method for transmitting correlation matrix feedback information of a mobile station considering adaptive feedback mode in a multi-cell wireless communication system according to one embodiment of the present invention comprises measuring a channel between the mobile station and a serving base station using a signal received from the serving base station; determining a first matrix indicating channel state information and a first precoder using the measured channel; generating a second matrix using a Fourier matrix and the first matrix; and transmitting feedback information including at least one of information of the first precoder and diagonal values of the second matrix.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: April 8, 2014
    Assignee: LG Electornics Inc.
    Inventors: Jian Xu, Ja Ho Koo, Bin Chul Ihm, Wook Bong Lee
  • Patent number: 8675751
    Abstract: A method of embedding information within a burst carrier signal, the method comprising modulating meta-data using a modulator such that a meta-carrier signal results, lowering a Power Spectral Density (PSD) of the meta-carrier signal by Direct Sequence Spread Spectrum (DSSS) chipping the meta-carrier signal using a linear Pseudo-Random Number (PRN) sequence, embedding one or more modulated symbols of the meta-carrier signal within an unused portion of one or more quadrants of a modulation constellation of a burst carrier signal such that a composite carrier signal results, and synchronously transmitting the composite carrier signal using a transmitter such that symbols of the meta-carrier signal are synchronized with symbols of the burst carrier signal.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: March 18, 2014
    Assignee: Comtech EF Data Corp.
    Inventors: Richard Hollingsworth Cannon, Michael Beeler, Cris Mamaril
  • Patent number: 8675769
    Abstract: A method and system for optimizing symbol mapping in partial response based communications that are based on use of pulse-shaping that incorporates a predetermined amount of inter-symbol interference (ISI). Optimizing symbol mapping symbol mapping may comprise configuring optimized constellation mapping for use in mapping and/or de-mapping data communicated using the partial response pulse-shaping. In this regard, the optimized constellation mapping may be based on a reference constellation mapping that is utilized for reference modulation scheme, and the configuring comprises applying adjustments to one or more constellation points in the reference constellation mapping. The optimized constellation mapping may be configured to optimize an applicable minimum distance for one or more selected error patterns for a given spectral compression applied during partial response based communications.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: March 18, 2014
    Assignee: MagnaCom Ltd.
    Inventor: Amir Eliaz
  • Patent number: 8665972
    Abstract: A method and apparatus for transmitting Channel State Information Reference Symbol (CSI-RS) and data with partial muting of the CSI-RS are proposed. The method includes determining a CSI-RS pattern to be used among CSI-RS pattern candidates, determining a muting pattern for muting some resource elements constituting CSI-RS pattern candidates except for the determined CSI-RS pattern, mapping data symbols and CSI-RS to resource elements in a resource grid with rate patching in consideration of the CSI-RS pattern and muting pattern, and transmitting the data symbols and CSI-RS to a terminal.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: March 4, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung Tae Kim, Youn Sun Kim, Jin-Kyu Han, Myung Hoon Yeon, Shan Cheng
  • Patent number: 8665995
    Abstract: There is provided a solution for dual channel transmission in a radio communication device. Both transmission signals to be transmitted on different channels are mixed two times by using oscillator signals having the same frequencies for both transmission signals, and the transmission circuitry is arranged to process the signals so that the transmission signals are nevertheless up-converted to different frequency channels.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: March 4, 2014
    Assignee: Nokia Corporation
    Inventor: Risto Vaisanen
  • Patent number: 8638894
    Abstract: An object of the present invention is to provide a data communication technique which can reduce a size of a system by enabling bidirectional data communication, and enables a cheap system configuration.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: January 28, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshikazu Yamazaki
  • Patent number: 8625697
    Abstract: An OFDM beamformer of a signal receiving system receives multiple frequency-domain sample signal vectors each transformed from arrival signals received by a corresponding antenna element of an antenna array, and includes: multiple signal splitters each splitting a corresponding frequency-domain sample signal vector into a data signal subvector and a pilot signal subvector based on predetermined position information; a weight generator generating an estimated auto-correlation matrix and an estimated cross-correlation vector based on the data signal subvectors, the pilot signal subvectors, and a reference pilot signal vector associated with a desired user, and generating an optimal weight vector based on the estimated auto-correlation matrix and the estimated cross-correlation vector; and a combining unit combining, based on the optimal weight vector, serial data signals converted from each data signal vector by a corresponding parallel-to-serial converter to generate an estimated data symbol output correspondi
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: January 7, 2014
    Assignee: I-Shou University
    Inventors: Ching-Tai Chiang, Rong-Ching Wu, Chen-Sen Ouyang, Jong-Ian Tsai
  • Patent number: 8619905
    Abstract: A predistorter includes a distortion compensating unit which gives, in advance, a reverse characteristic of a characteristic of input to output of a power amplifier to a transmission signal which is to be input to the power amplifier; a distortion compensation signal generating unit which generates a distortion compensation signal indicating the reverse characteristic based on transmission data that is sample data of the transmission signal and the delayed transmission data; and a delay amount control unit which controls a delay amount of the transmission data according to an output signal of the power amplifier.
    Type: Grant
    Filed: January 26, 2010
    Date of Patent: December 31, 2013
    Assignee: Fujitsu Limited
    Inventors: Hiroyoshi Ishikawa, Nobukazu Fudaba, Yuichi Utsunomiya, Kazuo Nagatani
  • Publication number: 20130329827
    Abstract: Random access operation is performed under a communication environment in which a plurality of communication modes having different transmission rate coexist with small overhead. A high-grade communication station spoofs information of a packet length and a rate in a decoding portion so that a value of (packet length)/(rate) corresponds to a duration where the communication is hoped to be stopped. The other station receiving the spoofed information receives the rest of the packet with the designated rate during the interval designated by the value of (packet length)/(rate). In this case, the packet length and the rate are not those of actually transmitted packet so that this packet is discarded.
    Type: Application
    Filed: August 9, 2013
    Publication date: December 12, 2013
    Applicant: Sony Corporation
    Inventors: Yuichi MORIOKA, Kazuyuki Sakoda, Shinichi Kuroda, Ryo Sawai
  • Patent number: 8605830
    Abstract: Systems and methods and memory media for performing modulation type detection. An attempt is made to estimate an underlying symbol rate of a received signal. The received signal is compensated for carrier frequency offset. Two candidates for symbol timing offset are estimated from the compensated signal. The compensated signal is downsampled using each offset candidate. A set of features is computed for each of the two downsampled signals. For each downsampled signal, the set of features is compared to a corresponding set of thresholds to obtain a corresponding set of comparison results. The two sets of comparison results are used to determine the modulation type of the received signal. A second method for estimating symbol rate may be performed if the modulation type is found to be FSK.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: December 10, 2013
    Assignee: National Instruments Corporation
    Inventors: Ankit Sethi, Baijayanta Ray
  • Patent number: 8605822
    Abstract: A data transmitting apparatus performs symbol mapping on each of first and second input data to generate a plurality of first and second modulation data symbols, performs inverse fast Fourier transform (IFFT) on the plurality of first and second modulation data symbols to convert the same into first and second real signals of a time domain from a frequency domain, angle-modulates the first and second real signals, and transmits the same to a data receiving apparatus. Thus, a peak-to-average power ratio (PAPR) can be lowered, while the same data transfer amount as that of the general OFDM data transmitting apparatus is maintained.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: December 10, 2013
    Assignee: Electronics & Telecommunications Research Institute
    Inventor: Jong Soo Lim
  • Patent number: 8600290
    Abstract: A technique for disrupting the operation of a target containing nonlinear electronic devices generally includes generating a high frequency signal; generating a low frequency signal; modulating the high frequency signal with the low frequency signal; and emitting the modulated high frequency signal at the target.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: December 3, 2013
    Assignee: Lockheed Martin Corporation
    Inventors: Steve E. Calico, David (Dave) S. Hidinger, Michael C. Scott
  • Publication number: 20130287134
    Abstract: A system and method for estimating carrier frequency offset ?f and carrier phase offset ?0 inherent in a received CPM signal. Samples of a continuous phase modulated (CPM) signal are received. A maximum of an objective function J is determined over a two-dimensional region parameterized by frequency offset v and phase offset w. The coordinates vmax and wmax of a maximizing point in the region represent estimates of the carrier frequency offset ?f and the carrier phase offset ?0. To evaluate the objective function J at a point (v,w), apply a frequency shift of amount ?v and a phase shift of amount ?w to the received samples to obtain modified samples, and perform Viterbi demodulation on the modified samples to obtain a winning path metric value at a final time. The winning path metric value is the objective function value J(v,w).
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Inventors: I. Zakir Ahmed, Vijaya Vajnanarayana
  • Patent number: 8565348
    Abstract: The radio transmitting apparatus includes a first initial phase value setting circuit that sets, in the first modulator, an initial value of the phase of the first modulated signal, which is a value at the start of the modulation according to the first modulation scheme. The radio transmitting apparatus includes a second initial phase value setting circuit that sets, in the second modulator, the phase stored in the phase storing circuit as an initial value of the phase of the second modulated signal, which is a value at the start of the modulation according to the second modulation scheme. The radio transmitting apparatus includes a signal gathering circuit that selects and outputs the first modulated signal output from the first modulator and then selects and outputs the second modulated signal output from the second modulator.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: October 22, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Keiji Tsunoda, Hideaki Majima, Hiroyuki Fujiki
  • Patent number: 8565352
    Abstract: Digital IQ imbalance compensation is utilized for a dual-carrier double conversion receiver. First, the effect of IQ imbalance on OFDM-based digital baseband is analyzed, showing that, in the presence of IQ imbalance, the baseband signal of each carrier is obtained from its own branch as well as the other branch. Second, IQ imbalance parameters of interest are estimated using pilot signals and compensated using only digital baseband processing.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: October 22, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Chester Park, Niklas Andgart
  • Patent number: 8565290
    Abstract: In accordance with an example embodiment of the present invention, there is provided an apparatus comprising transceiver circuitry configured to obtain a data unit received over an air interface, the air interface comprising first and second radio resources, logic circuitry configured to determine whether the data unit was received over the first radio resources or the second radio resources and responsive to a determination that the data unit was received over the first radio resources, process the data unit without interference cancellation and responsive to a determination that the data unit was received over the second radio resources, process the data unit using interference cancellation.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: October 22, 2013
    Assignee: Nokia Corporation
    Inventor: Markus Nentwig
  • Patent number: 8526525
    Abstract: Method and apparatus for communicating a radio signal between a first station and a second station, including estimating at least one characteristic of a radio channel from the first station including a first plurality of weightable transceiving elements, to the second station including a second plurality of weightable transceiving elements; calculating a receive weighting of at least one weightable transceiving element at the second station, responsive to the estimate; calculating a transmit weighting of at least one weightable transceiving element at the first station; and then communicating the radio signal by transmitting from the transmit-weighted transceiving elements at the first station, over the radio channel, to the receive-weighted transceiving elements at the second station, while reducing the response to unwanted interfering signals.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: September 3, 2013
    Inventor: Arvind V. Keerthi
  • Patent number: 8514965
    Abstract: A wireless communication system includes a) a first device having a transmitter part with a Tx-antenna for transmitting an electrical signal having a signal bandwidth BWsig and b) a second device having a receiver part with an Rx-antenna for receiving the transmitted electromagnetic signal. At least one of the Tx- and Rx- antennas is a narrowband antenna having an antenna bandwidth BWant, wherein the Tx- and/or Rx-antenna bandwidths fulfil the relation BWant=k·BWsig. The system is adapted to provide that k is smaller than 1.25, and the antenna bandwidth BWant is defined as the ?3dB bandwidth of the loaded antenna when it is connected to the communication system, and the signal bandwidth BWsig is defined as the bandwidth within which 99% of the desired signal power is located.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: August 20, 2013
    Assignee: Oticon A/S
    Inventors: Kåre Tais Christensen, Kehuai Wu, Rasmus Glarborg Jensen
  • Patent number: 8509351
    Abstract: The present disclosure relates to multi-mode RF circuitry using a single IQ modulator topology that may support different communication standards, including enhanced data rates for global system for mobile communications evolution (EDGE) and EDGE evolution by dividing certain modulation functions between a frequency synthesizer and an IQ modulator. Specifically, during a standard modulation mode, which may be used to support many communications standards, the frequency synthesizer provides an un-modulated RF carrier signal to the IQ modulator, which either phase modulates or phase and amplitude modulates the un-modulated RF carrier signal to provide a standard modulated RF signal.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 13, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Alexander Wayne Hietala, Marcus Granger-Jones
  • Patent number: 8503573
    Abstract: Disclosed is a bits-to-symbol mapping method of 4+12+16 amplitude phase shift keying (APSK) having excellent performance against the non-linearity of a high power amplifier. According to the present invention A bits-to-symbol mapping method of 4+12+16 APSK modulation, comprising: representing 32 symbols of the 4+12+16 APSK modulation by a polar coordinate and arranging the 32 symbols by a size of ? while giving priority to a symbol having a small signal size when the size of ? of two or more symbols are same; grouping the arranged 32 symbols into 4 groups according to quadrant regions where the symbols are located; and allocating bits so that the same bits are allocated to the symbols belonging to the same region for each region with respect to each of the first to fifth bits of the symbols grouped into four regions.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: August 6, 2013
    Assignees: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Hanyang University
    Inventors: Dae Ig Chang, Dongweon Yoon, Jaeyoon Lee
  • Publication number: 20130188746
    Abstract: Methods and apparatus for computing the carrier frequency of a transmitter using frequency modulated digital data to compensate for frequency shifting of the transmitter and the receiver local oscillators and for bandwidth adjustment of the receiver's filter. In particular, methods and apparatus are disclosed for binary systems transmitting “1” and “0” data using decoded or undecoded received signals.
    Type: Application
    Filed: March 11, 2013
    Publication date: July 25, 2013
    Applicant: ITRON, INC.
    Inventor: ITRON, INC.