Anti-multipath Patents (Class 455/65)
  • Patent number: 10257842
    Abstract: A method and an apparatus for providing zone based prediction. The method includes determining, by a base station, a plurality of zones by dividing a coverage area of a cell, receiving, by the base station, channel state information (CSI) from a user equipment (UE), identifying, by the base station, a first zone from the plurality of zones where the UE encounters an obstructed area based on the CSI at a time domain, and allocating, by the base station, at least one resource to the UE to compensate for signal losses if the UE enters the obstructed area.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: April 9, 2019
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Diwakar Sharma, Karthik Rangaraj Manavalan
  • Patent number: 9575157
    Abstract: Systems and methods for detecting a Line of Sight (LOS) in a cellular communications network are provided. In one embodiment, a network node in the cellular communications network determines whether a wireless device is within LOS of a base station. In order do so, the network node compares a Ricean factor of a wireless communications channel between the base station and the wireless device and a predetermined Ricean factor threshold for LOS detection. In addition, the network node compares a Root Mean Squared Error (RMSE) between a Rayleigh probability density function and samples of received signal strength for radio signals transmitted between the base station and the wireless device and a predetermined RMSE threshold for LOS detection. The network node then determines whether the wireless device is within LOS of the base station based on results of the comparisons.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: February 21, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Francesco Militano, Jan-Erik Berg, Konstantinos Dimou
  • Patent number: 9306642
    Abstract: The invention relates to a method for providing channel state information, CSI, about a radio channel (4) established between a first network element (2) and a second network element (3), the method comprising: providing an estimate (hn) of a channel coefficient (hn,a) of the radio channel (4) based on at least one signal, in particular a pilot signal (7), transmitted over the radio channel (4) from the first network element (2) to the second network element (3), making a prediction (I) of the channel coefficient (hn,a) of the radio channel (4) based on previous estimates (hn,k), and feeding back information about an error (en) between the prediction (I) and the estimate (hn) of the channel coefficient (hn,a) from the second network element (3) to the first network element (2). The invention also relates to network elements (2, 3) for implementing the method, as well as to a wireless communication network (1) comprising the same.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: April 5, 2016
    Assignee: Alcatel Lucent
    Inventor: Thorsten Wild
  • Patent number: 9161331
    Abstract: Systems and methods are disclosed to provide positioning enhancement to wireless systems to determine UE positioning using UE measurements. A method implemented by a UE for enabling positioning calculation includes receiving a Signal to Interference plus Noise Ratio (SINR) threshold from a network for filtering positioning measurements and performing a plurality of positioning measurements. The method also includes removing from the positioning measurements each measurement that does not meet the SINR threshold, and sending remaining positioning measurements that meet the SINR threshold to the network. Another method implemented by a network component includes receiving a plurality of positioning measurements with a plurality of corresponding SINRs from a user device and removing from the positioning measurements each measurement with a corresponding SINR that is less than or equal to a pre-determined SINR threshold.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: October 13, 2015
    Assignee: Futurwei Technologies, Inc.
    Inventors: Jie Cui, Dengkun Xiao, Xiang Chen, Jing Han, Anjian Li
  • Patent number: 9113350
    Abstract: Systems and methods for detecting a Line of Sight (LOS) in a cellular communications network are provided. In one embodiment, a network node in the cellular communications network determines whether a wireless device is within LOS of a base station. In order do so, the network node compares a Ricean factor of a wireless communications channel between the base station and the wireless device and a predetermined Ricean factor threshold for LOS detection. In addition, the network node compares a Root Mean Squared Error (RMSE) between a Rayleigh probability density function and samples of received signal strength for radio signals transmitted between the base station and the wireless device and a predetermined RMSE threshold for LOS detection. The network node then determines whether the wireless device is within LOS of the base station based on results of the comparisons.
    Type: Grant
    Filed: May 3, 2013
    Date of Patent: August 18, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Francesco Militano, Jan-Erik Berg, Konstantinos Dimou
  • Patent number: 9071296
    Abstract: Provided is a communication system using a space division multi-user multiple input multiple output (SD-MIMO) communication method. A transmission apparatus may transmit, to each of terminals included within a coverage, common control information commonly transmitted to the terminals and individual control information individually transmitted to each of the terminals. The transmission apparatus does not precode the common control information and transmits the non-precoded common control information. The transmission apparatus precodes the individual control information and transmits the precoded individual control information.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: June 30, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ui Kun Kwon, Tae Rim Park, Young Soo Kim, Eung Sun Kim
  • Patent number: 9060191
    Abstract: Technologies are generally described for Quality of Experience (QoE) computation in a wireless content transmission environment. Portions of audio and/or video content transmitted to user devices may be selected by a service provider/content provider/user device and transmitted back from the user device for real-time QoE computation. Transmission quality may be adjusted based on the real-time QoE computations. Alternatively, selected portions of the content may be stored for subsequent computation and improvement. Selected portions of the data may be frames marked as such and reference frames may be selected based on the marked frames.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: June 16, 2015
    Assignee: Empire Technology Development LLC
    Inventors: Nikhil Chhaochharia, Hariharan Ramasangu, George Paulose Koomullil, Ashish Tulsian
  • Publication number: 20150147976
    Abstract: Methods and systems are provided for preventing interference from simultaneous data transmissions in a remote control system. A controlled terminal is typically configured to receive control data from a controlling terminal and to transmit feedback data to a monitoring terminal. To prevent interference caused by the simultaneous transmissions of control data and feedback data. The controlling terminal can transmit the control data to the monitoring terminal, which then transmits the control data to the controlled terminal. Such transmission of the control data may be carried out in a way that does not interfere with the transmission of the feedback data.
    Type: Application
    Filed: November 14, 2014
    Publication date: May 28, 2015
    Inventors: Hong Tao Wang, Zhi Cong Huang
  • Patent number: 8995920
    Abstract: A wireless communication apparatus includes: a channel information acquiring unit that, acquires a transmitted signal channel matrix that is channel information as a transmitted signal of a pre-interference-removal transmitted signal group and an interference signal channel matrix that is channel information as an interference signal of the non-interference-removed transmitted signal group; an interference signal calculating unit that generates an interference signal group at the time of reception by the non-interference-removed transmitted signal group with respect to the pre-interference-removal transmitted signal group, based on the pre-interference-removal transmitted signal group, the non-interference-removed transmitted signal group, the transmitted signal channel matrix, and the interference signal channel matrix; a subtracting unit that subtracts the interference signal group from the pre-interference-removal transmitted signal group to generate a post-interference-removal transmitted signal group; an
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: March 31, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kozue Hirata, Takashi Onodera, Hiroshi Nakano, Minoru Kubota, Naoki Okamoto
  • Publication number: 20150072624
    Abstract: A wireless communication system is disclosed. The system includes a transmitter which includes a data source configured to provide data to be transmitted, a modulator configured to modulate the data, a pre-filter configured to apply a filter to the modulated data generating pre-filtered data, and a transmitter antenna configured to receive the pre-filtered data and to transmit the pre-filtered data, the pre-filter based on a phase compensation topology that is based on channel characteristics between the transmitter and a receiver, the frequency response of the pre-filter based on spectral phase information of the channel such that the frequency response at the receiver is proportional to the magnitude of the channel frequency response.
    Type: Application
    Filed: August 6, 2014
    Publication date: March 12, 2015
    Applicant: PURDUE RESEARCH FOUNDATION
    Inventors: Andrew M. Weiner, Amir Dezfooliyan
  • Patent number: 8934848
    Abstract: A wireless communication apparatus is provided including: a radio receiver configured to acquire, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting; a reception quality measurer configured to measure channel quality of each of a plurality of sub-carrier bands within a communication band; a subcarrier selector configured to select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number; a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands and a third information indicating positions of the selected sub-carrier bands according to a modulation scheme; and a radio transmitter configured to report to the base station the second and third modulated information.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: January 13, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Akihiko Nishio, Jun Cheng
  • Patent number: 8933594
    Abstract: A vehicle powering wireless receiver for use with a first electromagnetic resonator coupled to a power supply. The wireless receiver includes a load configured to power the drive system of a vehicle using electrical power, and a second electromagnetic resonator adapted to be housed upon the vehicle and configured to be coupled to the load, wherein the second electromagnetic resonator is configured to be wirelessly coupled to the first electromagnetic resonator to provide resonant, non-radiative wireless power to the second electromagnetic resonator from the first electromagnetic resonator; and wherein the field of at least one of the first electromagnetic resonator and the second electromagnetic resonator is shaped using a conducting surface to avoid a loss-inducing object.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: January 13, 2015
    Assignee: WiTricity Corporation
    Inventors: Andre B. Kurs, Aristeidis Karalis, Marin Soljacic, Katherine L. Hall, Morris P. Kesler, Andrew J. Campanella
  • Patent number: 8929829
    Abstract: A data movement controller (20) for controlling the movement between a shared data store (18) and a local data store (16) such that the data can be used by a plurality of parallel data processing elements is described. The data movement controller (20) comprises a set of data registers (56, 58, 60) which, in use, are loaded with different data parameters (57, 61, 62) to define a plurality of different ways in which data is transferred between the shared data store (18) and a set of processing elements (12). The data parameters (57, 61, 62) define a set of time delays for transferring portions of the data to predefined ones of the plurality of processing elements (12) and the type of overall data transfer that is to be carried out.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: January 6, 2015
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventor: Martin Whitaker
  • Patent number: 8918053
    Abstract: Embodiments of the present invention disclose an interference elimination method and apparatus for a multi-antenna system. The method includes: generating an equalization coefficient according to a baseband signal received on a receiving antenna, a channel estimation matrix, and an obtained cross-correlation matrix of transmitted signals of a downlink channel on multiple transmit antennas; and performing interference elimination processing on the baseband signal according to the equalization coefficient.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 23, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yi Yang, Shuojun Yu, Gengshi Wu, Nian Peng, Feng Li
  • Patent number: 8849209
    Abstract: A communications device may include a wireless radio frequency (RF) transceiver, and a controller coupled to the wireless RF transceiver. The controller may be configured to determine received signal characteristics and perform a spectral estimation operation associated with a frequency spectrum on the received signal characteristics, determine a channel selection method characteristic associated with a channel in the frequency spectrum including channels, generate statistical values for each channel based upon the received signal characteristics, and select a portion of the frequency spectrum for a signal to be transmitted by the wireless RF transceiver based upon the spectral estimation operation, the statistical values, and the channel selection method characteristic.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: September 30, 2014
    Assignee: Harris Corporation
    Inventors: John Wesley Nieto, William Nelson Furman, Eric Norman Koski
  • Publication number: 20140254706
    Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal. All received signals are coupled to the same adaptive array or adaptive filter to reduce multipath or other shared interference of the first radio signal, which reduces multipath and other shared interference in the other radio signals before they are separated and processed by their respective receivers, or the individual radio signals are separated before the first signal enters the adaptive array and coupled to a slave weighting network slaved to the weights of the adaptive array of the first signal to reduce interference in all the signals.
    Type: Application
    Filed: May 4, 2014
    Publication date: September 11, 2014
    Inventor: Kenneth Frank Rilling
  • Patent number: 8824582
    Abstract: A base station is arranged for performing channel coding and link adaptation. The base station comprises one or more processors and physical layer circuitry arranged to decode symbols received from a user station to determine an error rate, the symbols received through a plurality of antennas, receive signaling from the user station, the signaling including channel quality information for channel resources of an orthogonal frequency division multiplexed (OFDM) channel, select a modulation and coding rate for transmission of symbols to the user station based at least in part on the error rate, and transmit a transmit power control command to the user station, the transmit power control command based at least in part on a downlink path loss estimate. The base station may also transmit additional transmit power control commands to the user station based on the error rate of subsequently decoded symbols.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: September 2, 2014
    Assignee: Intel Corporation
    Inventors: Eric A. Jacobsen, Adrian P. Stephens
  • Patent number: 8798214
    Abstract: Techniques for assigning multipaths to finger processors to achieve the desired data performance and low power consumption are described. A search is initially performed to obtain a set of multipaths for a transmission from at least one base station. At least one multipath (e.g., the minimum number of multipaths) having a combined performance metric (e.g., a combined SNR) exceeding a threshold is identified. The at least one multipath is assigned to, and processed by, at least one finger processor to recover the transmission from the base station(s).
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: August 5, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Michael Alexander Howard, June Namgoong, Hanfang Pan
  • Patent number: 8787837
    Abstract: A wireless communication apparatus is provided including: a radio receiver configured to acquire, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting; a reception quality measurer configured to measure channel quality of each of a plurality of sub-carrier bands within a communication band; a subcarrier selector configured to select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number; a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands and a third information indicating positions of the selected sub-carrier bands according to a modulation scheme; and a radio transmitter configured to report to the base station the second and third modulated information.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: July 22, 2014
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Akihiko Nishio, Jun Cheng
  • Patent number: 8767881
    Abstract: A signal processing apparatus is disclosed which includes: a detection section configured such that based on a result of the error correction of a signal generated by a single carrier system, the detection section detects the presence or absence of spectrum inversion in the signal; and a selection section configured such that if the detection section detects the spectrum inversion, the selection section selects the spectrally inverted signal as the signal subject to the error correction, and that if the detection section does not detect the spectrum inversion, then the selection selects the spectrally uninverted signal as the signal subject to the error correction.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: July 1, 2014
    Assignee: Sony Corporation
    Inventors: Takashi Yokokawa, Ryoji Ikegaya, Yuji Shinohara
  • Patent number: 8767860
    Abstract: A method for communication includes performing by one or more processors and/or circuits in a communication device functions including determining transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via the wireless channel. The determining may be based on a transmission mode of the wireless signal and a state of the wireless communication channel. Transmit antenna spatial weights may be determined for communicating the one or more wireless signals via a plurality of antennas. The one or more wireless signals may be weighted with the transmit power weights and/or one of the transmit antenna spatial weights. The weighted one or more wireless signals may be transmitted via one of a plurality of antennas in accordance with the transmission mode.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: July 1, 2014
    Assignee: Broadcom Corporation
    Inventors: Severine Catreux, Vinko Erceg, Pieter Roux, Pieter van Rooyen, Jack Winters
  • Patent number: 8705645
    Abstract: An orthogonal-frequency division multiplexed (OFDM) transmitter is configured to transmit a data unit in accordance with a multiple-input multiple-output (MIMO) technique over a wideband channel comprising a 20 MHz channel and another channel using a plurality of spatially diverse antennas. The transmitter is further configured to include in the data unit, a parameter indicating a modulation and coding scheme and a parameter indicating number of spatial streams. Each of the spatial streams is encoded and beamformed for receipt by one or more different receiving stations.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: April 22, 2014
    Assignee: Intel Corporation
    Inventors: John S. Sadowsky, Minnie Ho, Sumeet Sandhu, Alexander A. Maltsev, Eric A. Jacobsen, Ali S. Sadri
  • Patent number: 8681887
    Abstract: A system and method for estimating a channel in a wireless receiver is disclosed. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either (1) repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or (2) using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed according to the method.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: March 25, 2014
    Assignee: AT&T Mobility II LLC
    Inventors: Titus Lo, Ruifeng Wang
  • Patent number: 8660496
    Abstract: In a telecommunications network. including a first cell with a first base station node having a first node controller component and a first radio network controller (RNC) component; a method of mitigating interference within the first cell including: the first base station node determining when the first cell is experiencing interference; and the first base station node determining which one or more adjacent cells is likely to be a source of the interference; and the first base station node initiating a command configured to effect a reduction in power used by the one or more adjacent cells. The determination of likely interference source may be by received total wideband power (RTWP) measurements or outer loop power control (OLPC) commands.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: February 25, 2014
    Assignee: Vodafone Group PLC
    Inventor: Matthew Cheng
  • Patent number: 8626077
    Abstract: A radio communication device capable of lightening the influence of a frequency selective fading in the wide-band transmission of a single carrier thereby to prevent deterioration of error rate characteristics. In this device, an FFT unit subjects a modulated signal inputted from a modulation unit to a Fourier transformation. A pilot insertion unit inserts a pilot symbol into a plurality of individual frequency components of the modulated signal. Weight multiplication units multiply the individual frequency components and the pilot symbols inserted into the individual frequency components, by weight coefficients set at a weight coefficient setting unit. IFFT units subject the frequency components to an inverse Fourier transformation, thereby to convert the frequency components into time domains.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: January 7, 2014
    Assignee: Panasonic Corporation
    Inventor: Akihiko Nishio
  • Patent number: 8620221
    Abstract: A base station device (10) communicates between a first terminal device and a second terminal device over the same channel by spatial multiplexing. The base station device (10) comprises an interference cancellation coefficient extractor (30) that extracts an interference cancellation coefficient from a signal received from the first terminal device to cancel interference on a propagation channel with the first terminal device in advance, and transmits a pilot signal that contains information related to the interference cancellation coefficient to the second terminal device.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: December 31, 2013
    Assignee: Panasonic Corporation
    Inventors: Takaaki Kishigami, Shozo Okasaka
  • Patent number: 8615200
    Abstract: A method for improving channel estimation in a wireless communication system is disclosed. A wireless signal that includes a plurality of multipath components is received. N channel estimates are then obtained, where N is any positive integer greater than one. Each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components. The effects of interference between the plurality of multipath components on the N channel estimates is then reduced.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: December 24, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Durga Prasad Malladi, Josef J. Blanz, Yongbin Wei
  • Patent number: 8600423
    Abstract: Method and apparatus for improving a noise power estimate in a wideband CDMA (WCDMA) network are disclosed and may include calculating a total noise power estimate for a downlink channel based on a plurality of control channel bits from a plurality of different types of control channels. The plurality of control channel bits may include at least two of: dedicated physical channel (DPCH) transmit power control (TPC) bits, DPCH pilot bits, and common pilot channel (CPICH) bits. A first noise power estimate may be calculated for the downlink channel based on a plurality of the DPCH TPC bits. A value of at least one of the plurality of DPCH TPC bits may not be known when the at least one of the plurality of DPCH TPC bits is received.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: December 3, 2013
    Assignee: Broadcom Corporation
    Inventors: Severine Erceg, Vinko Erceg, Mark Kent, Uri M. Landau
  • Patent number: 8594242
    Abstract: A method for receiving modulation signals includes receiving a plurality of multiplexed modulation signals each transmitted from multiple antennas of a communication partner, wherein each modulation signal includes a pilot symbol sequence consisting of plural pilot symbols used for demodulation. Each of the pilot symbol sequences is inserted at the same temporal points in the each modulation signal. The pilot symbol sequences are orthogonal to each other with zero cross correlation among the plurality of modulation signals, each pilot symbol having a non-zero amplitude, the quantity of the plural pilot symbols in each sequence being greater than the quantity of the plurality of transmitted modulation signals.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: November 26, 2013
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8593976
    Abstract: It is an object to provide a wireless base station and a terminal equipment capable of shortening the processing time by not requiring the detection of the spatial correlation coefficient, which is required in general technology, and simplifying the selection process for terminal equipments to be connected to each other in a wireless base station that performs spatial multiplexing transmission to a plurality of terminal equipments and a terminal equipment responding for spatial multiplexing transmission. A terminal equipment 12 includes an interference cancellation capability information data maintaining section 20 that maintains interference cancellation capability information data indicating the interference cancellation capability of the terminal equipment 12 and signals the interference cancellation capability information data to a wireless base station 1.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: November 26, 2013
    Assignee: Panasonic Corporation
    Inventors: Takaaki Kishigami, Shutai Okamura, Hidekuni Yomo, Yoshihito Kawai
  • Patent number: 8588694
    Abstract: The present invention relates to a method and arrangement in a transmitter unit of a multi-antenna system for an improved calculating of the antenna weights for a beamforming transmission of data from a transmitter unit to a target receiver unit, whereby interfering signal components for receiving units other than the target receiving unit and the desired communication signal at a target receiving unit are weighted by receiver-specific parameters describing the receiver capabilities of said units in terms of their capability for interference suppression and/or signal enhancement. The invention also relates to a method and arrangement for scheduling of user equipments by using said information on the signal processing capabilities for received signals of each receiving unit.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: November 19, 2013
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Bo Goransson, Sven Petersson, Stefan Felter
  • Patent number: 8577299
    Abstract: To transmit data in a manner to mitigate the deleterious effects of delay spread, the expected coverage areas for multiple transmissions to be sent in multiple time slots are initially determined. Cyclic prefix lengths for these transmissions are selected based on the expected coverage areas. The cyclic prefix length for each transmission may be selected from among a set of allowed cyclic prefix lengths based on the expected coverage area for that transmission, the pilot staggering used for the transmission, and so on. For example, a shorter cyclic prefix length may be selected for each local transmission, and a longer cyclic prefix length may be selected for each wide-area transmission. The selected cyclic prefix lengths may be signaled to the terminals. The transmissions are processed (e.g., OFDM modulated) based on the selected cyclic prefix lengths. The cyclic prefix lengths may be selected periodically, e.g., in each super-frame.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: November 5, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Avneesh Agrawal, Durga Prasad Malladi, Anastasios Stamoulis, Ashok Mantravadi, Ramaswamy Murali
  • Patent number: 8543136
    Abstract: A terminal receives a unique sequence from each of at least two base stations, and transmits a mixture of quantized unique sequences to a serving base station. The serving base station extracts components respectively corresponding to base stations from the mixture of the quantized unique sequences, and estimates a location of a terminal based on the extracted components. The serving base station may calculate a received signal strength or a delay for each of the unique sequences received by the terminal, based on the extracted components, and estimate the location of the terminal based on the received signal strength or the delay. In addition, the terminal may estimate its own location by performing an algorithm used by the serving base station.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: September 24, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong Bu Lim, Kyung Hun Jang
  • Patent number: 8532581
    Abstract: A wireless communication method and apparatus are provided for selecting quality-reporting sub-carrier bands based on sub-carrier band quantity information received from a base station. The method includes generally four steps. First, from a base station, information indicating quantity of sub-carrier bands is acquired. Second, channel quality of each of a plurality of sub-carrier bands within a communication band is measured from a received signal. Third, sub-carrier bands are selected from the plurality of sub-carrier bands, wherein quantity of the selected sub-carrier bands corresponds to the quantity of sub-carrier bands indicated by the acquired information. Fourth, information indicating channel quality of the selected sub-carrier bands is reported to the base station.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: September 10, 2013
    Assignee: Panasonic Corporation
    Inventors: Akihiko Nishio, Jun Cheng
  • Patent number: 8498658
    Abstract: Techniques, apparatuses and systems for providing communications based on time reversal of a channel impulse response of a pulse in a transmission channel between a transmitter and a receiver to enhance reception and detection of a pulse at the receiver against various effects that can adversely affect and complicate the reception and detection of the pulse at the receiver.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: July 30, 2013
    Assignee: Ziva Corporation
    Inventors: David F. Smith, Anis Husain
  • Patent number: 8494453
    Abstract: A method of handling measurement for a mobile device capable of communicating with a network through a maximum number of component carriers in a wireless communication system is disclosed. The method comprises receiving data with the maximum number of component carriers, receiving a command for deactivating one of the maximum number of component carriers, from the network, deactivating the component carrier indicated by the command, and performing an inter-frequency measurement without any measurement gap.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: July 23, 2013
    Assignee: HTC Corporation
    Inventor: Chih-Hsiang Wu
  • Patent number: 8494569
    Abstract: Systems and methods related to the detection of incoming wireless signals. An antenna array is synthesized by having a single antenna, coupled to a receiver, spatially translated along an arbitrary trajectory. As the antenna is being spatially translated, a data processing means samples the incoming signal based on a clock signal provided by a system clock. By sampling the incoming signal at different times at different spatial locations on the arbitrary trajectory, the system acts as a synthetic antenna array. The different samplings of the incoming signal at different times and positions provide signal diversity gain as well as different readings which can be used to detect an incoming signal. The invention is applicable to detecting a wireless communications signal or a GNSS signal under various conditions. The system may include at least one sensor which can provide data for use in calculating data related to the arbitrary trajectory.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: July 23, 2013
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence
    Inventors: John Nielsen, Gerard Lachapelle, Ali Broumandan
  • Patent number: 8488725
    Abstract: A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. Spatial channel state information is measured at receiving equipment and then decomposed into components. The components are then quantized using codebook(s) and fed back as multiple indices to transmitting equipment.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: July 16, 2013
    Assignees: ZTE Corporation, ZTE (USA) Inc.
    Inventors: Yifei Yuan, Shupeng Li, David Huo
  • Patent number: 8472877
    Abstract: A system and method for Interference Cancellation (IC). One aspect relates to iterative interference cancellation with iterative finger delay adaptation. The interference cancellation method comprises receiving multi-paths of a signal; and performing iterative interference cancellation to remove multi-path interference, wherein the performing iterative IC comprises estimating a Signal-to-Interference-plus-Noise Ratio (SINR) at each of a plurality of pre-determined rake receiver finger delays, and performing successive Channel Estimation (CE) and IC on rake receiver fingers according to their estimated SINRs, and wherein the CE of a next finger does not start until interference of a previous finger is removed from a sample buffer. The method may further comprise improving estimated rake receiver finger delay, and each iteration decreases the amount of interference observed by each finger.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: June 25, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Jilei Hou, Joseph B. Soriaga, John Edward Smee, Jinghu Chen
  • Patent number: 8442443
    Abstract: The present invention relates to a method which analysis the characteristics of the received signal and selects the best beam arrangement for a transmitter/receiver pair for a given situation in a communication system. In particular, the channel delay profile provides characteristics which help to determine and evaluate the quality of a signal link. The result of this evaluation is used for selecting the best beam arrangement.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: May 14, 2013
    Assignee: Sony Corporation
    Inventors: Richard Stirling-Gallacher, Juán Nogueira-Nine
  • Patent number: 8442444
    Abstract: A method of transmit power control to allow a transmission side to execute transmit power control so that a signal to interference ratio (SIR) measured at a reception side is matched with a target SIR, the method includes digitizing a reception environment at the reception side, and setting the target SIR corresponding to an error rate of reception data for each of the reception environments; and changing the target SIR in accordance with the reception environment measured at the reception side or the reception environment selected at the reception side.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: May 14, 2013
    Assignee: Fujitsu Limited
    Inventor: Keiji Nibe
  • Patent number: 8412126
    Abstract: Methods of forming a downlink beam in an adaptive antenna system of a communications system that may reduce inter-system and/or intra-system interference include receiving vectors of signals including signals transmitted by user terminals of the communications system and signals transmitted by transceivers of an independent communications system, obtaining spatial information for the user terminals of the communications system and the transceivers of the independent communications system, generating complex transmitting weights that form spatial nulls directed at the transceivers of the independent communications system, and transmitting a downlink communications signal using the complex transmitting weights. Related systems are also disclosed.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: April 2, 2013
    Assignee: ATC Technologies, LLC
    Inventors: Peter D. Karabinis, Dunmin Zheng
  • Patent number: 8412271
    Abstract: A base station includes a reference signal generator, a boost selector, and a transmitter. The reference signal generator provides a dedicated reference signal to be transmitted over a plurality of antennas to a dedicated user device. The boost selector selects a dedicated boost level that is specific for the dedicated reference signal. The boost selector applies the dedicated boost level to the dedicated reference signal and not to a data signal to be transmitted to the dedicated user device. The boost selector generates a boosted dedicated reference signal. The transmitter transmits the boosted dedicated reference signal and the data signal to the dedicated user device after beamforming weights are applied to the boosted dedicated reference signal and to the data signal.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: April 2, 2013
    Assignee: Marvell World Trade Ltd.
    Inventor: Daniel Yellin
  • Patent number: 8406754
    Abstract: An apparatus and method for beamforming in a wireless communication system are provided. The base station apparatus includes a calculator, a plurality of formers, and a plurality of adders. The calculator calculates a beam coefficient considering interference to a neighbor sector to be applied to transmission signals to mobile stations. The plurality of formers performs beamforming for a transmission signal to each mobile station within a corresponding sector using the beam coefficient. The plurality of adders adds the sector-based beamformed signals each provided from the plurality of formers, on a per-transmission-antenna basis.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: March 26, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Heon-Ki Chae, Keun-Chul Hwang, Byoung-Ha Yi
  • Patent number: 8401485
    Abstract: A device system, computer medium and method for calibrating at least one impairment of a signal transmitted from a transmitting unit to a receiving unit, the method including receiving at the receiving unit at least two signals transmitted from the transmitting unit, estimating at the receiving unit, based on the received at least two signals, at least one parameter associated with transmit chain links between the transmitting unit and corresponding antennas of the transmitting unit, collecting the at least one parameter in a measurement report at the receiving unit, and transmitting the measurement report from the receiving unit for correcting the at least one impairment based on the at least one parameter.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: March 19, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: George Jöngren, David Astely, Bo Göransson, Jonas B. Karlsson
  • Patent number: 8396176
    Abstract: An OFDM receiving device for settling a problem of complicated configuration is provided, in that the OFDM receiving device receives an OFDM signal where no smaller than one specific sub-carriers among plurality of sub-carriers are modulated by a known modulation signal sk(t), and includes a converting means for converting the received OFDM signal into the received signals for each sub-carrier, an extracting means for extracting the ingredient caused by a frequency drift and a phase noise based on received signal rk(t) of the specific sub-carrier and the known modulation signal sk(t), and a compensating means for H) compensating the received signal of the sub-carrier using the extracted ingredient.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: March 12, 2013
    Assignee: NEC Corporation
    Inventor: Masaki Ichihara
  • Patent number: 8396147
    Abstract: A MIMO transmitter and method for transmitting a group of sequential OFDM symbols on a downlink channel using a plurality of antennas is disclosed herein. Groups of OFDM subcarriers are individually modulated in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers, corresponding symbol-modulated subcarriers are combined for transmission on each of a plurality of spatial channels, and beamforming is performed on the combined symbol-modulated subcarriers for transmission over the spatial channels. The channel comprises a plurality of the groups of the OFDM subcarriers and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments. The spatial-frequency subcarrier modulation assignments for each group are determined based on feedback by a receiver, which is determined from spatial channel characteristics of the spatial channels.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: March 12, 2013
    Assignee: Intel Corporation
    Inventors: John S. Sadowsky, Minnie Ho, Eric A. Jacobsen, Alexander A. Maltsev, Ali S. Sadri, Sumeet Sandhu
  • Patent number: 8340139
    Abstract: In wireless systems, method and system for weight determination in a single channel (SC) multiple-input multiple-output (MIMO) system for WCDMA/HSDPA are provided. Models of signals received in multiple receive antennas may be determined in a single weight baseband generator (SWBBG) from propagation channel estimates and noise statistics. The models may be utilized to determine combined signal and noise components. The combined signal and noise components may be utilized to determine a plurality of signal-to-noise ratio (SNR) or signal-to-interference-and-noise ratio (SINR) values for various phase and/or amplitude factors. The SINR may be utilized when either single or multiple interfering signals are present. A highest of the SINR or SNR values may be selected to determine a channel weight to apply to the additional receive antennas.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: December 25, 2012
    Assignee: Broadcom Corporation
    Inventors: Mark Kent, Vinko Erceg, Uri M. Landau, Pieter G. W. van Rooyen
  • Patent number: 8340606
    Abstract: A transmitter and a signal amplifier are provided. The signal amplifier includes a digital-to-analog converter converting an input digital signal into an analog signal, a local oscillator signal generator outputting in-phase and quadrature-phase oscillator signals, a first mixer mixing the analog signal with the in-phase local oscillator signal to output an in-phase high frequency signal, a second mixer mixing the analog signal with the quadrature-phase local oscillator signal to output a quadrature-phase high frequency signal, a main amplifier amplifying the in-phase high frequency signal output from the first mixer, and an auxiliary amplifier amplifying the quadrature-phase high frequency signal output from the second mixer.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: December 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-soo Park, Do-hyung Kim, Jin-wook Burm, Seong-soo Lee, Heung-bae Lee
  • Publication number: 20120321009
    Abstract: A multiple independent narrow-channel wireless network and method for transmitting and received data over a wireless network using a fragmented frequency spectrum. The system and method uses a plurality of narrow wireless channels obtained from splitting a wide wireless channel. Each narrow channel performs sending, receiving, and carrier sensing. Moreover, each narrow channel is independent such that data can be sent or received without any interference from other narrow channels and without synchronization. Embodiments of the system and method include a compound radio having a compound receiver and a compound transmitter. The compound transmitter includes an inter-radiolet symbol synchronization module, to permit use of a single inverse fast Fourier transform block, and a dynamically configurable filter array, to mitigate leakage between channels. The compound receiver uses fraction data rate processing to optimize efficiency.
    Type: Application
    Filed: June 17, 2011
    Publication date: December 20, 2012
    Applicant: Microsoft Corporation
    Inventors: Krishna Kant Chintalapudi, Bozidar Radunovic, Horia Vlad Balan, Michael Buettner, Vishnu Navda, Ramachandran Ramjee