Pilot Patents (Class 370/500)
  • Patent number: 10218481
    Abstract: A method of transmitting a reference signal by a base station in a wireless communication system is provided. The method includes: generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: February 26, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Moon Il Lee, Ja Ho Koo, Jae Hoon Chung, Bin Chul Ihm, Hyun Soo Ko
  • Patent number: 9898826
    Abstract: An information processing apparatus inputs shape data indicating shapes and positional relationships of a plurality of objects; based on the shape data, in a space formed by a plurality of blocks each having a predetermined size, generates block data in which a corresponding attribute of an object or a space is allocated to each of the plurality of blocks; determines a part of blocks adjacent to a block having the attribute of the object in the block data as a block used for detection processing of a difference of contacted states of the objects between the shape data and the block data; and performs the detection processing by using the determined block as being used for the detection processing among the blocks adjacent to the block having the attribute of the object.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: February 20, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Hironori Takashima
  • Patent number: 9642125
    Abstract: The present invention relates to a method for transmitting and receiving data in a wireless access system and a terminal therefor. The method comprises the steps of: receiving an instruction message which instructs transmission of uplink resource allocation information via a physical downlink shared channel (PDSCH) from a base station; determining whether the resource allocation information is a first downlink resource allocation information based on the instruction message, upon receiving resource allocation information set to a flag value that indicates uplink resource allocation information, from the base station via a physical downlink control channel (PDCCH); receiving uplink resource allocation information via the PDSCH according to the first downlink resource allocation information from the base station; and transmitting uplink data to the base station via a physical uplink shared channel (PUSCH) according to the uplink resource allocation information.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: May 2, 2017
    Assignee: LG Electronics Inc.
    Inventors: Jinmin Kim, Seunghee Han, Hyunwoo Lee
  • Patent number: 9491641
    Abstract: A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, determining a level of interference from a signal received on the first component carrier to a signal on the second component carrier based on a signal characteristic of the first component carrier and a signal characteristic of the second component carrier, and providing signal interference information to a serving base station if the determined interference level satisfies a condition.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: November 8, 2016
    Assignee: Google Technology Holdings LLC
    Inventors: Sandeep H. Krishnamurthy, Colin D. Frank
  • Patent number: 9219586
    Abstract: Provided is a radio communication device which can prevent interference between SRS and PUCCH when the PUCCH transmission bandwidth fluctuates and suppress degradation of CQI estimation accuracy by the band where no SRS is transmitted. The device includes: an SRS code generation unit (201) which generates an SRS (Sounding Reference Signal) for measuring uplink line data channel quality; an SRS arrangement unit (202) which frequency-multiplexes the SRS on the SR transmission band and arranges it; and an SRS arrangement control unit (208) which controls SRS frequency multiplex so as to be uniform in frequency without modifying the bandwidth of one SRS multiplex unit in accordance with the fluctuation of the reference signal transmission bandwidth according to the SRS arrangement information transmitted from the base station and furthermore controls the transmission interval of the frequency-multiplexed SRS.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: December 22, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Atsushi Matsumoto, Daichi Imamura, Takashi Iwai, Yoshihiko Ogawa, Tomofumi Takata, Katsuhiko Hiramatsu
  • Patent number: 9106395
    Abstract: A method of transmitting a reference signal by a base station in a wireless communication system is provided. The method includes: generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: August 11, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Moon Il Lee, Ja Ho Koo, Jae Hoon Chung, Bin Chul Ihm, Hyun Soo Ko
  • Patent number: 9059831
    Abstract: In an SC-FDE system, in accordance with FDPMT, a transmitter may be configured to replace data carried by one or more signals, e.g., one or more sub-carriers, with the data included in a pilot frequency sequence. The starting position of the pilot frequency sequence may affect the BER value of the system. The transmitter may then be configured to choose a proper starting position for the pilot frequency sequence so that the BER of the overall system may be minimum.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: June 16, 2015
    Assignee: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventors: Xiang Cheng, Miaowen Wen
  • Patent number: 9008036
    Abstract: The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: April 14, 2015
    Assignee: Apple Inc.
    Inventors: Jianglei Ma, Ming Jia, Hua Xu, Wen Tong, Peiying Zhu, Moussa Abdi
  • Patent number: 9007921
    Abstract: The present disclosure provides systems and methods for noise tolerant signal processing in a pilot assisted data receiver, including: given received pilots with common pilot components and individual pilot components, computing coefficients associated with the individual pilot components of the received pilots; and applying the computed coefficients to the received pilots to obtain conditioned pilots. The individual pilot components result from relatively slow changes of the received pilots relative to the common pilot components. The common pilot components result from relatively fast changes of the received pilots relative to the individual pilot components.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: April 14, 2015
    Assignee: Ciena Corporation
    Inventors: Vladimir Pelekhaty, Michael Y. Frankel
  • Patent number: 8989171
    Abstract: A system and method transmit a data stream from a source to a destination over a communication channel. A transmitter includes devices for processing inputs to assemble data packets for the data stream, and a multiplexer for assembling a data frame to be transmitted over the communication channel, in which each data frame has at least one fixed slot. The multiplexer sets at least one freely allocatable time slot in each data frame. Retransmission control devices connected to the multiplexer retransmit a specific data packet which is not properly received by the destination, using one of the freely allocatable slots.
    Type: Grant
    Filed: April 5, 2004
    Date of Patent: March 24, 2015
    Assignee: Microchip Technology, Inc.
    Inventors: Willem Zwart, Dignus-Jan Moelker, Robert Niels Schutten, Robertus Cornelis Wilhelmus Lansbergen, Maarten Coenen, Johannes Cornelis Hendrikus van Leeuwen
  • Patent number: 8982998
    Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: March 17, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8971937
    Abstract: A system and method for synchronizing the operation of a wireless mobile station (102) and a base station (104) includes receiving a message at the base station (104) indicating a state of operation of the wireless mobile station (102). A determination is made as to whether the base station (104) and the mobile station (102) are in synchronization based upon comparing the state of operation of the mobile station (102) and a state of operation of the base station (104).
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: March 3, 2015
    Assignee: Google Technology Holdings LLC
    Inventors: Sanjeev Garg, Alfredo R. Castillo
  • Patent number: 8934438
    Abstract: A wireless device updates a first timing advance of a secondary cell group employing first timing advance command(s) for the secondary cell group. The wireless device stores the first timing advance upon expiry of an associated time alignment timer. The wireless device receives a second timing advance command for the secondary cell group with a timing advance value of zero. The second timing advance command starts the associated time alignment timer. The wireless device transmits uplink signals in radio resources identified in a received uplink grant employing the stored first timing advance.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 13, 2015
    Assignee: Ofinno Technologies, LLC
    Inventor: Esmael Hejazi Dinan
  • Patent number: 8929353
    Abstract: Techniques for sending sector/system information in TDM pilots using a hierarchical pilot structure are described. A base station sends multiple sets of bits for the sector/system information in multiple TDM pilots. The set of bits sent in a given TDM pilot may include bits sent in earlier TDM pilots. In one design, the base station generates a first TDM pilot based on a first set of bits, generates a second TDM pilot based on a second set of bits that includes the first set, generates a third TDM pilot based on all bits for the information, and sends the TDM pilots. A terminal performs detection to obtain a first detected value for the first TDM pilot, performs detection based on the first detected value to obtain a second detected value for the second TDM pilot, and performs detection based on the first and second detected values to obtain a third detected value for the third TDM pilot.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: January 6, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Michael Mao Wang
  • Patent number: 8917679
    Abstract: A network signals an allocation (PDCCH) for a downlink shared channel (PDSCH); and also signals an indication (reference signal RS) whether a resource block (PRB) comprising the allocated downlink shared channel is used for a control channel transmission (E-PDCCH). Examples include the E-PDCCH being time or frequency multiplexed with the PDSCH; and the indication being a different RS sequence (at least one element being phase shifted) than an original RS sequence used if the PRB were not used for the E-PDCCH. The UE tests for the phase shift by blind decoding. If the phase shift is present the UE a) decodes a portion of the PRB for data if the network is using TDM for its E-PDCCH/PDSCH multiplexing, orb) decodes the full PRB only for the E-PDCCH if the network is using FDM for its E-PDCCH/PDSCH multiplexing.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 23, 2014
    Assignee: Nokia Corporation
    Inventors: Lars E. Lindh, Klaus Hugl
  • Patent number: 8891590
    Abstract: Systems, methods, and other embodiments associated with processing wireless signals. According to one embodiment, a wireless receiver includes at least one antenna configured to receive a wireless signal. The wireless signal comprises pilot symbols dispersed irregularly throughout a two-dimensional grid. The pilot symbols of the wireless signal are usable by the wireless receiver to estimate the wireless channel at each point in the two-dimensional grid. The wireless receiver includes a pattern logic including hardware configured to generate additional pilot symbols in the two-dimensional grid. The additional pilot symbols generated by the pattern logic along with the pilot symbols dispersed irregularly throughout the two-dimensional grid form a regular distribution of pilot symbols in the two-dimensional grid. The wireless receiver is configured to estimate the wireless channel at each point in the two-dimensional grid based on the regular distribution of pilot symbols in the two-dimensional grid.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: November 18, 2014
    Assignee: Marvell International Ltd.
    Inventors: Raphael Cendrillon, Yakun Sun, Jiwoong Choi, Hui-Ling Lou
  • Patent number: 8867570
    Abstract: A method and apparatus of transmitting pilot tones and data in multi-carrier spatial multiplexing transmission is disclosed. The method includes a plurality of subscribers transmitting data to a base station through common frequency sub-carrier and symbol time tiles. Each of the multiple subscribers rotating frequency sub-carrier and symbol time locations of pilot tones within the frequency sub-carrier and symbol time tiles.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: October 21, 2014
    Assignee: Broadcom Corporation
    Inventors: Sriram Mudulodu, Rajesh Raja Manakkal, Sam P. Alex, Louay Jalloul
  • Patent number: 8867368
    Abstract: The present disclosure provides systems and methods for noise tolerant signal processing in a pilot assisted data receiver, including: given received pilots with common pilot components and individual pilot components, computing coefficients associated with the individual pilot components of the received pilots; and applying the computed coefficients to the received pilots to obtain conditioned pilots. The individual pilot components result from relatively slow changes of the received pilots relative to the common pilot components. The common pilot components result from relatively fast changes of the received pilots relative to the individual pilot components.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: October 21, 2014
    Assignee: Ciena Corporation
    Inventors: Vladimir Pelekhaty, Michael Y. Frankel
  • Patent number: 8861551
    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: October 14, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Hyun Hwang, Chang-Joo Kim, Myung-Sun Song, Jung-Sun Um
  • Patent number: 8842700
    Abstract: Methods and apparatus are provided for a User Equipment (UE) to transmit a Sounding Reference Signal (SRS). A first Downlink Control Information (DCI) format with an aperiodic SRS request field indicating aperiodic SRS transmission with first values for aperiodic SRS transmission parameters, is received. A second DCI format with an aperiodic SRS request field indicating aperiodic SRS transmission with second values for the aperiodic SRS transmission parameters, is received. The first values for the aperiodic SRS transmission parameters are compared with the second values for the aperiodic SRS transmission parameters. An aperiodic SRS is transmitted when the first values are identical to the second values. Transmission of the aperiodic SRS is suspended when the first values are not identical to the second values.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: September 23, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Aris Papasakellariou, Joon-Young Cho
  • Patent number: 8831080
    Abstract: A receiver in a multiple input, multiple output (MIMO) system is configured to perform a method for generating channel quality feedback information. The method includes receiving, from a MIMO transmitter, pilot signals in each MIMO layer. The method also includes estimating the MIMO channel using the received pilot signals and performing a QR decomposition of the estimated MIMO channel. The method further includes predicting a probability of error for each MIMO layer after the QR decomposition of the estimated MIMO channel. The method still further includes determining a corresponding signal-to-noise ratio (SNR) for each MIMO layer based on the probability of error for the each MIMO layer.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: September 9, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ankit Gupta
  • Patent number: 8811331
    Abstract: A multi-pilot frame handler (36) of a radio access network node (28) is arranged to prepare a block of a frame of information to include a first pilot signal of a pilot signal first type and a first pilot signal of a pilot signal second type. The pilot signal of the pilot signal first type is expressed as a first Costas array base pattern of resource elements of the block; the pilot signal of the second type is expressed as a second Costas array base pattern of resource elements of the block. The multi-pilot frame handler (36) is arranged to prepare the block so that any pilot signal of the pilot signal first type is carried by at least some subcarriers of a first set of subcarriers of the block and any pilot signal of the pilot signal second type is carried by at least some subcarriers of a second set of subcarriers of the block.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: August 19, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Havish Koorapaty, Jiann-Ching Guey, Kumar Balachandran, Rajaram Ramesh
  • Patent number: 8811352
    Abstract: A method of channel estimation for a signal having a first portion transmitted using a transmit delay diversity scheme and a second portion transmitted using another multi-antenna transmission scheme includes determining a composite channel estimate from the transmit delay diversity portion of the signal. The method continues with segregating the composite channel estimate into delay groups corresponding to time offsets of the transmit delay diversity scheme for determination of first channel estimates for each subset of transmit antennas. Second channel estimates are determined for each subset of transmit antennas as a function of pilot symbols received in the second portion of the signal and corresponding ones of the first channel estimates. Thus, the first channel estimates are used to improve estimation of the second channel estimates. The method and variations of it may be implemented by configuring one or more processing circuits within a receiver circuit.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: August 19, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Rajaram Ramesh, Havish Koorapaty, Kumar Balachandran
  • Patent number: 8787907
    Abstract: A method of wireless communication includes determining at least one neighboring apparatus from which to obtain information, obtaining information related to a plurality of channels from the at least one neighboring apparatus, selecting a channel from the plurality of channels based on the obtained information, and transmitting on the selected channel.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: July 22, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Avinash Jain, Ahmed K. Sadek
  • Patent number: 8780942
    Abstract: A detection section (8) of a communication device (1) includes a correlation calculation section for calculating correlation between a known TCCH symbol pattern and a demodulated complex symbol pattern received by a reception section (20) in each of a last symbol period in one sub-slot and subsequent one symbol period and a reception state acquisition section for obtaining, based on a result of the calculation in the correlation calculation section, a delay amount of a timing of receiving the signal from a communication partner device.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: July 15, 2014
    Assignee: KYOCERA Corporation
    Inventor: Shinsuke Moriai
  • Patent number: 8774226
    Abstract: The present invention provides a method and device for generating and mapping a Channel State Information Reference Signal (CSI-RS) sequence, and the method includes: generating a pseudo-random sequence according to a pseudo-random sequence initial value, performing a Quadrature Phase-Shift Keying (QPSK) modulation on the pseudo-random sequence, and obtaining a first CSI-RS sequence according to maximum bandwidth of system; and cutting the first CSI-RS sequence according to the actual bandwidth of the system, obtaining a second CSI-RS sequence, and mapping the second CSI-RS sequence to a time frequency location of a CSI-RS antenna port. The CSI-RS reference signal sequence can be generated or obtained respectively at the UE terminal and eNB terminal in accordance with the stated methods for generating and mapping the reference sequence according to known parameters by the present invention, so that the calculated CSI-RS sequence can be utilized to measure the channel at the UE terminal.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: July 8, 2014
    Assignee: ZTE Corporation
    Inventors: Senbao Guo, Yunfeng Sun, Changqing Zhu, Chenchen Zhang
  • Patent number: 8767700
    Abstract: Methods and systems for dual frequency timing acquisition for compressed WCDMA communication networks may include processing received WCDMA signals. The WCDMA signals, which may be primary synchronization channel signals, may comprise signals transmitted by one base station at one frequency band and by another base station at a different frequency band, during a compressed frame. Samples of the received WCDMA signals from the different base stations may be stored in portions of a memory allocated for signals from each base station. The received WCDMA signals having the first frequency band may be processed via the processing circuitry during a non-compressed frame. The samples corresponding to the signals with the first frequency band during the non-compressed frame may be stored in the memory. The received WCDMA signals may be sampled at a faster rate during the non-compressed frame than during the compressed frame.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: July 1, 2014
    Assignee: Broadcom Corporation
    Inventors: Francis Swarts, Mark Kent, Uri Landau
  • Patent number: 8744005
    Abstract: A method of generating modulation signals is disclosed including generally three steps. A plurality of modulation signals are generated, each of which is to be transmitted from a different one of a plurality of antennas in an identical frequency band, wherein each modulation signal includes a pilot symbol sequence including a plurality of pilot symbols used for demodulation. Each of the pilot symbol sequences is inserted at the same temporal point in each modulation signal, wherein the pilot symbol sequences are orthogonal to each other with zero mutual correlation among the plurality of modulation signals, each pilot symbol having a non-zero amplitude, the quantity of the plurality of pilot symbols in each sequence being greater than the quantity of the plurality of modulation signals to be transmitted. The plurality of modulation signals each including different transmission data and one of the pilot symbol sequences are output to the antennas.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: June 3, 2014
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8737508
    Abstract: In the communications system of the present invention, a communications terminal determines a precoding matrix index in a pilot signal received through a specific downlink channel, examines channel quality information of the downlink channel according to the determined precoding matrix index, and transmits feedback information to a serving base station, which determines a priority factor by using the examined channel quality information, and compares the priority factor with other priority factors. The comparison is used such that a base station having a high priority suggests the use of the precoding matrix to the neighboring base station.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: May 27, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yu Seok Kim, Eun Yong Kim, Yung Soo Kim, Sang Min Lee
  • Patent number: 8711914
    Abstract: A channel estimating method and device are provided. The method includes: performing multi-path searching on a pilot channel, and performing interpolation on a channel estimation value at a radial position of the multi-path searching (101); performing raised cosine de-convolution on the channel estimation value that undergoes the interpolation (102); acquiring the channel estimation value at each radial position in the pilot channel according to the channel estimation value that undergoes the raised cosine de-convolution and a sample deviation acquired by performing the multi-path searching (103). The channel estimating method and device eliminate the sample deviation of the channel estimation value, improve the demodulation performance, and evidently reduce the operation workload.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: April 29, 2014
    Assignee: Huawei Device Co., Ltd.
    Inventors: Gengshi Wu, Meng Hua, Chunling Zhang, Shurong Jiao, Xiuqin Peng
  • Patent number: 8705656
    Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: April 22, 2014
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8699529
    Abstract: Within a receiver, a channel estimation mechanism involves a hardware interpolator. In a first mode, narrowband pilot values are analyzed to generate channel parameters that are supplied to the interpolator such that the interpolator generates channel estimate values. The channel estimate values are used to demodulate a tile of a frame. In a second mode, broadband pilot values are supplied to an IFFT, thereby generating time domain values. After time domain processing, an FFT is employed to generate intermediate channel estimate values. These intermediate values are analyzed to determine channel parameters, which in turn are supplied to the hardware interpolator so that the interpolator generates a larger number of channel estimate values. After phase adjustment, the channel estimate values are used in demodulation. Use of the interpolator in the broadband mode allows the FFT employed to be of a smaller order, and to consume less power and/or processing resources.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: April 15, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Petru Cristian Budianu, Arunava Chaudhuri, Raghu N. Challa
  • Patent number: 8675749
    Abstract: A system and method is provided for estimating the channel in OFDM transmission with inter-carrier interference (ICI). A channel in a data subcarrier in a subchannel shared between pilot subcarriers and data subcarriers can be estimated by performing interpolation based on estimated channels in pilot subcarriers in the same OFDM symbol as the subcarrier, such as through spline interpolation. A second estimate of the channel in the subcarrier can be produced by averaging an estimate of the channel in a subcarrier in the subchannel in a previous OFDM symbol and an estimate of the channel in a subcarrier in the subchannel in a succeeding OFDM symbol. A third estimate of the channel in the subcarrier can be produced through a linear combination of the first estimate and the second estimate. The channel in data subcarriers can be estimated through a weighted sum of the channel in nearest subcarriers.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: March 18, 2014
    Assignee: SiTune Corporation
    Inventors: Mahdi Khoshgard, Vahid Mesgarpour Toosi
  • Patent number: 8670465
    Abstract: A user terminal in a radio communication system, in which each of user terminals performs multiplexing of a data signal and a pilot signal and transmits the multiplexed signal to a base station using different data transmission band frequencies that are assigned by the base station, the user terminal includes a receiving unit that receives uplink resource information from a base station. A pilot generation unit that generates a pilot signal based on the uplink resource information and a transmitting unit that transmits the pilot signal generated by the pilot generation unit to the base station where the pilot generation unit includes a sequence generation unit that generates a Zadoff-Chu sequence as a pilot signal based on the uplink resource information and a subcarrier mapping unit that performs mapping of a sequence generated by cyclically copying the Zadoff-Chu sequence.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: March 11, 2014
    Assignee: Fujitsu Limited
    Inventors: Tsuyoshi Shimomura, Dai Kimura
  • Patent number: 8665910
    Abstract: A concept for estimating interfering channels in a multicellular radio communication system including a plurality of base stations and at least one mobile station is suggest, wherein pilot signals are transmitted from the base stations to at least a mobile station, additional pilot sequences are generated, a pattern is provided which defines a rule for distributing the pilot sequences to the base stations, the pilot sequences are modulated and superposed onto said pilot signals, and a pilot signal received at a mobile station is used for estimating interferences in the communication channel from the base station which transmits the pilot signal.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: March 4, 2014
    Assignee: Nokia Siemens Networks Oy
    Inventors: Thomas Haustein, Volker Jungnickel, Malte Schellmann, Stefan Schiffermüller, Lars Thiele, Thomas Wirth, Wolfgang Zirwas
  • Patent number: 8654794
    Abstract: A radio communication method in a radio communication system in which data signals for a first and second user are respectively transmitted using first and second subcarrier groups, and pilot signals for the first and second users are multiplexed using time-division multiplexing with the data signals for those users, including arranging a pilot signal of the first user at frequencies different from frequencies of a pilot signal of the second user and mapping subcarrier components of the pilot signals so that one of subcarrier components of higher frequencies corresponds to one of subcarrier components of lower frequencies, wherein the pilot signals are generated using a Zadoff-Chu sequence.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: February 18, 2014
    Assignee: Fujitsu Limited
    Inventors: Tsuyoshi Shimomura, Dai Kimura
  • Patent number: 8649353
    Abstract: A method and apparatus for accessing a random access channel (RACH) during handover are disclosed. A handover procedure is initiated and a maximum handover interruption timer is activated. A dedicated preamble is transmitted in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired. A contention-based preamble is transmitted in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. If the maximum handover interruption timer has expired, a contention-based preamble is transmitted in an attempt to access the RACH.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: February 11, 2014
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Guodong Zhang, Jin Wang
  • Patent number: 8644361
    Abstract: Provided is a terminal apparatus that can suppress the increase in interference between pilot signals in the same slot, while also suppressing the degradation of the flexibility to design cell cluster structures. When hopping information indicates an inter-slot hopping, a mapping unit (212) arranges a first pilot sequences in which a group to which the sequences used in respective slots belong varies on a slot-by-slot basis. When the hopping information indicates an inter-subframe hopping, the mapping unit (212) arranges a second pilot sequences in which a group to which the sequences used in respective slots belong varies on a subframe-by-subframe basis. The sequence group to which the sequences used in any one of the subframes in the second pilot sequences belong is identical with the sequence group to which the sequence used in any one of the slots included in that one subframe in the first pilot sequences belongs.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: February 4, 2014
    Assignee: Panasonic Corporation
    Inventors: Yoshihiko Ogawa, Takashi Iwai, Akihiko Nishio, Seigo Nakao
  • Patent number: 8638710
    Abstract: Techniques for relaying a broadcast transmission in a wireless network are described. In one design, a relay may receive at least one transmission of a packet from a transmitter (e.g., a broadcast station) and may process the at least one transmission to decode the packet. The relay may generate at least one remaining transmission of the packet after correctly decoding the packet. The transmitter may broadcast multiple transmissions of the packet to receivers. The at least one transmission may be at least one of the multiple transmissions, and the at least one remaining transmission may be remaining ones of the multiple transmissions. The relay may send the at least one remaining transmission of the packet at the same time and on the same resources used by the transmitter. The multiple transmissions may be HARQ transmissions containing different redundancy information for the packet.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: January 28, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Palanki, Avneesh Agrawal
  • Patent number: 8638745
    Abstract: At least some reference symbols dedicated to a particular communication device are transmitted in resource blocks allocated to other devices. This way, reference symbol assignments are not unduly restricted by other constraints placed on the boundary elements of a resource block. According to an embodiment, data and reference signals are transmitted by transmitting a resource block allocated to a first communication device. The resource block includes a plurality of resource elements, each resource element corresponding to a modulation symbol. At least one reference symbol associated with the resource block and dedicated to the first communication device is transmitted in a resource block allocated to a second communication device. On the receive side, the communication device can perform channel estimation based on reference symbols dedicated to the device that are transmitted in resource blocks allocated to the device and in resource block(s) allocated to other communication device(s).
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: January 28, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Jiann-Ching Guey, Havish Koorapaty
  • Patent number: 8634438
    Abstract: Systems and methods for performing a handoff of an access terminal from a macro node to a femto node are disclosed. To direct handoff of the access terminal, an identity of the femto node is determined. A femto node provided may be identified by at least a difference between the offset of a first pilot signal and the offset of a second pilot signal.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: January 21, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Sanjiv Nanda, Mehmet Yavuz, J. Rodney Walton, Peter J. Black
  • Patent number: 8611376
    Abstract: A method and apparatus are provided for the transmission of radio data between at least two transmitters and one receiver, said method employing at least one multi-carrier data transmission signal. The aforementioned multi-carrier signal is formed by a temporal succession of symbols comprising: (i) informative data elements, and (ii) reference elements known as pilots which are distributed within the informative data elements according to a pre-determined pattern. Moreover, the value of said pilots at transmission is known to the receiver. At least two transmitters use different pilot patterns such that, at a give instant and a give frequency, only one pilot can be received (possibly with other informative data elements) by the receiver from other transmitters.
    Type: Grant
    Filed: April 16, 2004
    Date of Patent: December 17, 2013
    Assignee: Sierra Wireless
    Inventor: Nicolas Ibrahim
  • Patent number: 8605690
    Abstract: Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: December 10, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Bojan Vrcelj, Ashok Mantravadi, Krishna Kiran Mukkavilli, Raghuraman Krishnamoorthi
  • Patent number: 8599749
    Abstract: Apparatus and methods are described herein for detecting pilot signals. An access terminal determines whether each pilot signal in its active set can be tracked. If not, the access terminal adjusts the search window center associated with any untracked pilot to a position that allows tracking. In some aspects, a known search window center of a tracked member of a same pilot group may be used.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: December 3, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Gregory R. Lie, Lijun Lin, Robert K. Chan, Manasi D. Gandhi
  • Patent number: 8599810
    Abstract: A method, equipment and system for implementing coordinated multi-point transmission are provided for resolving the problem that there exists phase noise in the signals received by a User Equipment (UE) end in coordinated multi-point transmission. The method for implementing coordinated multi-point transmission includes: obtaining phase differences between the current service cell and other coordinated cells by calculating channel cross-covariance matrixes between the current service cell and other coordinated cells in a coordinated multi-point transmission system (101); feeding back the phase differences corresponding to the base stations of said other coordinated cells respectively to the base stations of said other coordinated cells, in order to implement phase compensation (102); receiving the signals transmitted after the phase compensation by base stations of all the coordinated cells (103).
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: December 3, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Guolin Sun, Feng Ye, Xiujuan Gao
  • Patent number: 8588274
    Abstract: The present invention relates to a pilot tone generating method and apparatus of an orthogonal frequency division multiple access system and method, and a channel estimation method and apparatus using the same. The channel estimation apparatus includes a pilot tone extracting unit for extracting a pilot tone, which is inserted within a frame with data tone, masked with an orthogonal code; a pilot tone unmasking unit for unmasking of the pilot tone extracted from the pilot tone extracting unit by using an orthogonal code information; and a channel estimation operating unit for estimating a channel by calculating an average of the pilot tones which is unmasked in the unmasking unit.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: November 19, 2013
    Assignee: Intellectual Discovery, Ltd.
    Inventors: Dong-Kwan Lee, Jung-Ju Kim
  • Patent number: 8571067
    Abstract: The present invention provides a method and device for generating and mapping a Channel State Information Reference Signal (CSI-RS) sequence, and the method includes: generating a pseudo-random sequence according to a pseudo-random sequence initial value, performing a Quadrature Phase-Shift Keying (QPSK) modulation on the pseudo-random sequence, and obtaining a first CSI-RS sequence according to maximum bandwidth of system; and cutting the first CSI-RS sequence according to the actual bandwidth of the system, obtaining a second CSI-RS sequence, and mapping the second CSI-RS sequence to a time frequency location of a CSI-RS antenna port. The CSI-RS reference signal sequence can be generated or obtained respectively at the UE terminal and eNB terminal in accordance with the stated methods for generating and mapping the reference sequence according to known parameters by the present invention, so that the calculated CSI-RS sequence can be utilized to measure the channel at the UE terminal.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: October 29, 2013
    Assignee: ZTE Corporation
    Inventors: Senbao Guo, Yunfeng Sun, Changqing Zhu, Chenchen Zhang
  • Patent number: 8565268
    Abstract: The present application discloses a method in which a base station transmits a reference signal sequence in a wireless communication system. In detail, the method comprises the steps of: generating a pseudo-random sequence using a first m-sequence and a second m-sequence; generating the reference signal sequence using the pseudo-random sequence; and transmitting the reference signal to a mobile station via antenna ports different from one another. The second m-sequence has an initial value containing parameters for discriminating reference signal sequences among users.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: October 22, 2013
    Assignee: LG Electronics Inc.
    Inventors: Bong Hoe Kim, Byeong Woo Kang, Dae Won Lee, Yu Jin Noh, Ki Jun Kim, Dong Wook Roh
  • Patent number: 8559339
    Abstract: Methods and systems are provided for implementing a low-cost-Internet-base-station-(LCIB) user-adaptation algorithm. In an embodiment, an LCIB receives usage attempts from a plurality of mobile stations. The LCIB stores records corresponding to the usage attempts, where each record identifies the corresponding mobile station from which the corresponding usage attempt was received. The LCIB uses the records to classify each mobile station in the plurality of mobile stations as authorized or rather as unauthorized. The LCIB then configures its coverage area so as to exclude the unauthorized mobile stations.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: October 15, 2013
    Assignee: Sprint Spectrum L.P.
    Inventors: Ryan S. Talley, Bryan T. Barbee, Timothy W. Sill
  • Patent number: RE45522
    Abstract: A method of generating a code sequence in a wireless communication system is disclosed. More specifically, the method includes recognizing a desired length of the code sequence, generating a code sequence having a length different from the desired length, and modifying the length of the generated code sequence to equal the desired length. Here, the step of modifying includes discarding at least one element of the generated code sequence or inserting at least one null element to the generated code sequence.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: May 19, 2015
    Assignee: EVOLVED WIRELESS LLC
    Inventors: Seung Hee Han, Min Seok Noh, Yeon Hyeon Kwon, Hyun Hwa Park, Hyun Woo Lee, Dong Cheol Kim