Quadrature Amplitude Modulation Patents (Class 375/261)
  • Patent number: 10718811
    Abstract: A jitter measurement circuit includes an addition circuit to add a digital rectangular signal to an adjustment signal generated by a circuit that generates a first error signal based on a phase difference between a first clock signal or a data signal on which the first clock signal is superimposed and a second clock signal and generates the adjustment signal by filtering the first error signal, and a calculation circuit to calculate a first correlation value for representing an autocorrelation of the first error signal when the rectangular signal is not added to the adjustment signal, and a second correlation value for representing the autocorrelation when the rectangular signal is added to the adjustment signal, based on the first error signal and a second error signal obtained by delaying the first error signal by a variable delay amount, and output the first correlation value and the second correlation value.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: July 21, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Joshua Liang, Ali Sheikholeslami, Sanroku Tsukamoto, Hirotaka Tamura, Hisakatsu Yamaguchi
  • Patent number: 10666479
    Abstract: A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: May 26, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anton Monk, Michail Tsatsanis, Yoav Hebron
  • Patent number: 10638485
    Abstract: A base station (BS) may transmit, and a user equipment (UE) may receive, a physical broadcast channel, such as a narrowband physical broadcast channel (NB-PBCH). In an interference-limited scenario with synchronous cells in a network, repetitions of a symbol being transmitted for a first physical broadcast channel of a first cell may collide with repetitions of a symbol being transmitted for a second physical broadcast channel of a second cell. This may result in the UE being unable to recover symbols of a physical broadcast channel. In some aspects, the BS may transmit, and the UE may receive, a physical broadcast channel including bits processed using a first processing stage, such as using first scrambling sequences, and a second processing stage, such as using second scrambling sequences, to compensate for the interference, thereby ensuring that the UE can recover the symbols of the physical broadcast channel.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: April 28, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Alberto Rico Alvarino, Kapil Bhattad, Xiao feng Wang, Juan Montojo, Wanshi Chen, Peter Gaal
  • Patent number: 10604240
    Abstract: A braking system architecture for aircraft, the architecture comprising: a brake including friction members and electromechanical actuators for exerting a braking torque on the wheel; a computer situated in the fuselage of the aircraft and arranged to produce first control signals; and a junction box situated on the undercarriage, the junction box being connected to the computer and to the electromechanical actuators, the junction box being configured to receive the first control signals and to use the first control signals to produce second control signals for application to the electromechanical actuators in order to control the electromechanical actuators.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: March 31, 2020
    Assignee: SAFRAN LANDING SYSTEMS
    Inventors: Brian Goyez, Dominique Onfroy, Olivier Frey
  • Patent number: 10585209
    Abstract: Methods and apparatus for estimating parameters of interest of a volume in an earth formation from a response spectrum representing radiation information obtained by a radiation detector in a borehole intersecting the volume responsive to nuclear phenomena in the volume, the response spectrum including spectral distortion resulting i) environmental conditions in the formation, or ii) deterioration of at least one component of the radiation detector. Methods include recovering an enhanced response spectrum estimating the true spectrum, comprising mitigating the spectral distortion by applying at least one contrast sharpening mask to the response spectrum. The at least one contrast sharpening mask may comprise at least a low pass smoothing mask subtracted from a unity mask which when applied to the response spectrum obtains high-frequency data and adds the high-frequency data to the response spectrum. The response spectrum may be a gamma ray spectrum.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: March 10, 2020
    Assignee: BAKER HUGHES, A GE COMPANY, LLC
    Inventors: Feyzi Inanc, Toyli Anniyev, Maxim Vasilyev, David Chace
  • Patent number: 10582506
    Abstract: The invention relates to a network entity for managing communications of a plurality of communication devices within a communication network, a communication device of the plurality of communication devices being configured to transmit a multi-carrier communication signal comprising a plurality of sub-carriers, and to transmit an energy efficiency indicator indicating an energy efficiency specification of the communication device, the network entity comprising a communication interface being configured to receive the energy efficiency indicator over the communication network, and a processor being configured to determine a sub-carrier frequency spacing of the plurality of sub-carriers upon the basis of the energy efficiency indicator, and to generate a resource block indicator associated with the communication device, wherein the resource block indicator indicates the sub-carrier frequency spacing, wherein the communication interface is further configured to transmit the resource block indicator over the comm
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: March 3, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jian Luo, Zhao Zhao
  • Patent number: 10542456
    Abstract: A plurality of payload messages is communicated on a radio link of a cellular network between a terminal and an access node of the cellular network. Each one of the plurality of payload messages includes a data packet encoded according to a given redundancy version. The number of the plurality of payload messages may be dynamically and flexibly adjusted in some embodiments. Examples are given which may be applied for coverage enhancement in the Internet of Things or Machine Type Communication domain.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: January 21, 2020
    Assignee: Sony Corporation
    Inventors: Peter C. Karlsson, Rickard Ljung, Vanja Plicanic Samuelsson, Lars Nord
  • Patent number: 10511417
    Abstract: Methods and apparatus for multi-carrier communication with variable channel bandwidth are disclosed, where the time frame structure and the OFDM symbol structure are invariant and the frequency-domain signal structure is flexible. In one embodiment, a mobile station, upon entering a geographic area, uses a core-band to initiate communication and obtain essential information and subsequently switches to full operating bandwidth of the area for the remainder of the communication. If the mobile station operates in a wide range of bandwidths, the mobile station divides the full range into sub-ranges and adjusts its sampling frequency and its FFT size in each sub-range.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: December 17, 2019
    Assignee: INTELLECTUAL VENTURES II LLC
    Inventors: Xiaodong Li, Titus Lo, Kemin Li, Haiming Huang
  • Patent number: 10511343
    Abstract: Wireless communication wherein channel estimation accuracy is improved while keeping the position of each bit in a frame, even when a modulation system having a large modulation multiple value is used for a data symbol. An encoding operation encodes and outputs transmitting data (bit string) and a bit converting operation converts at least one bit of a plurality of bits constituting a data symbol to be used for channel estimation, among the encoded bit strings, into ‘1’ or ‘0’. A modulating operation modulates the bit string inputted from the bit converting operation by using a single modulation mapper and a plurality of data symbols are generated.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: December 17, 2019
    Assignee: PANASONIC CORPORATION
    Inventors: Kenichi Miyoshi, Hidetoshi Suzuki, Katsuhiko Hiramatsu, Christian Wengerter, Alexander Golitschek Edler Von Elbwart
  • Patent number: 10499048
    Abstract: The invention relates to a method and apparatus for evaluating a network and for predicting network performance for a higher order modulation by analyzing network signals modulated using a lower order modulation format. A margin index may be generated for the current or projected modulation formats based on displacement vectors for received symbols to indicate a margin remaining before a codeword error occurs to alert the network operator of potential performance issues before actual codeword errors occur.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: December 3, 2019
    Assignee: VIAVI SOLUTIONS INC.
    Inventors: Jim Walsh, Ching-Chang Liao
  • Patent number: 10491295
    Abstract: One or more operational parameters associated with pluggable optical transceivers are estimated to mitigate impairments to an optical signal caused by imperfections in the optical transceivers. A monitoring algorithm within a receiver signal processor may further use the estimated operational parameters associated with the pluggable optical transceivers to determine whether the transceivers are performing correctly. If the monitoring algorithm determines that either the transmitting or receiving optical transceiver is not functioning correctly, it may generate an alarm signal to notify a system administrator about the damaged device.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: November 26, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Christopher R. Fludger, Soeren Gehrke, Johann B. Schiessl
  • Patent number: 10484219
    Abstract: A method of wireless communication by a user equipment includes determining an allocation of a set of tones in a symbol for conveying data. The method further includes determining to use m-ary phase shift keying (MPSK) to modulate the data onto a subset of tones of the set of tones. The method further includes modulating the data onto the subset of tones based on a mapping, wherein the mapping maps pairs of data values with a largest Hamming distance from each other to pairs of constellation points with a maximum Euclidean distance from each other.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: November 19, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Xiao feng Wang, Junyi Li, Zhi-Zhong Yu
  • Patent number: 10476713
    Abstract: Provided is a transmission method that contributes to an increase in data reception quality when iterative detection is performed at a receive apparatus side. A transmit apparatus alternates between two types of modulation scheme that each shift amplitude and phase, performs mapping to constellation points according to a selected modulation scheme, and transmits a modulated signal obtained by mapping.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: November 12, 2019
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10418972
    Abstract: The disclosure relates to a phase shifter having a first mode of operation and a second mode of operation, the phase shifter comprising a mixer stage configured to mix an oscillator signal with an analog signal to provide a phase shifted signal, switching circuitry and a controller arranged to provide the analog signal to the mixer stage as a voltage in the first mode of operation and as a current in the second mode of operation.
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: September 17, 2019
    Assignee: NXP B.V.
    Inventors: Stephane Thuries, Cristian Pavao Moreira, Gilles Montoriol
  • Patent number: 10411941
    Abstract: Example embodiments provide a system and method for controlling power allocated to each of the constituent constellations that make up a superposed symbol constellation. In some examples, superposed constellations with adaptive power allocation are used in wireless local area networks (WLAN).
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 10, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jung Hoon Suh, Jia Jia, Osama Aboul-Magd, Kwok Shum Au
  • Patent number: 10374772
    Abstract: In a MIMO detector, a slicing list detection scheme employs a complex plane to represent symbols in an alphabet, in which all decision regions are bounded by either vertical lines or horizontal lines. A K-best scheme accesses the complex plane and an offline-generated lookup table to detect elements of a received vector. At each level, the system prunes all but the K-best candidates from each surviving node through the slicing list detector.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: August 6, 2019
    Assignee: Georgia Tech Research Corporation
    Inventors: Sangwook Suh, John R. Barry
  • Patent number: 10327155
    Abstract: An electronic apparatus and a method in a wireless communication system are disclosed. The electronic apparatus comprises processing circuitry configured to train a beam adjustment model for adaptive beamforming with training data, so that the beam adjustment model outputs, for any movement path of a user equipment, beam information which enables a beam adjustment time interval meeting a performance requirement of the user equipment to be optimized. According to embodiments of the disclosure, the beam adjustment model is trained by taking the beam adjustment time interval as an optimization target, and adaptive beamforming is performed using the trained beam adjustment model, so that it is possible to significantly reduce system overhead and measurement and processing overhead for beam adjustment, while ensuring communication performance of the user equipment.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: June 18, 2019
    Assignee: SONY CORPORATION
    Inventors: Youping Zhao, Dongzhi Zhu, Chen Sun, Xin Guo
  • Patent number: 10312977
    Abstract: A receiver decodes received data streams based on a subset of candidate decoding constellation points. A first stage of a decoder of the receiver selects a subset of candidate decoding constellation points by identifying a decoded value for an initial data stream of the set of data streams. A second stage then applies MMSE error detection to each of the constellation points in the selected subset, and calculates an error metric based on the MMSE error detection results. The decoder selects the constellation points having the lowest error metrics, and uses the selected constellation points as an initial set of points for decoding the next data stream to be decoded.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: June 4, 2019
    Assignee: NXP USA, Inc.
    Inventors: Marius Octavian Arvinte, Wim Joseph Rouwet
  • Patent number: 10298286
    Abstract: Wireless communication wherein channel estimation accuracy is improved while keeping the position of each bit in a frame, even when a modulation system having a large modulation multiple value is used for a data symbol. An encoding operation encodes and outputs transmitting data (bit string) and a bit converting operation converts at least one bit of a plurality of bits constituting a data symbol to be used for channel estimation, among the encoded bit strings, into ‘1’ or ‘0’. A modulating operation modulates the bit string inputted from the bit converting operation by using a single modulation mapper and a plurality of data symbols are generated.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: May 21, 2019
    Assignee: Panasonic Corporation
    Inventors: Kenichi Miyoshi, Hidetoshi Suzuki, Katsuhiko Hiramatsu, Christian Wengerter, Alexander Golitschek Edler Von Elbwart
  • Patent number: 10284408
    Abstract: A method and apparatus for transmitting a Wi-Fi signal in a wireless communication system is provided. A device supporting long-term evolution in unlicensed spectrum (LTE-U) transmits a LTE signal, and transmits the Wi-Fi signal. The Wi-Fi signal may be transmitted by various methods, i.e. by being emulated in the LTE signal, by using a Wi-Fi processor which is embedded in a LTE processor, or by using a Wi-Fi processor which is individual to a LTE processor.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: May 7, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Yunjung Yi, Hyangsun You, Byounghoon Kim, Seonwook Kim, Joonkui Ahn, Kijun Kim
  • Patent number: 10277361
    Abstract: A method, an apparatus, and a system for transmitting information bits, where the method for transmitting information bits includes: dividing the information bits to be transmitted into at least two groups; encoding the information bits to be transmitted in each group; modulating the coded bits obtained by the encoding to obtain modulation symbols, in which each modulation symbol is obtained by using the modulation of the coded bits in the same group; and mapping and transmitting the modulation symbols. In this way, the receiving end easily reduces the algorithm complexity, thereby ensuring the performance of the receiving end.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: April 30, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Xiaofeng Chen, Yongxia Lv, Yan Cheng
  • Patent number: 10270641
    Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-generation (4G) communication system, such as long-term evolution (LTE). An operation method of a transmitter in a wireless communication system is provided. The method includes applying a filter to data, mapping the data to which the filter is applied to at least one subcarrier, and transmitting the mapped data to a receiver. The filter is determined based on based on the allocated resource.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: April 23, 2019
    Assignees: Samsung Electronics Co., Ltd., POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Chanhong Kim, Jubum Kim, Yeohun Yun, Joon Ho Cho
  • Patent number: 10250516
    Abstract: A first device determines whether an indicator is configured to allow use of an increased value for an information unit pacing credit that is greater than a default value for the information unit pacing credit, where the information unit pacing credit indicates a number of information units that a second device is allowed to send to the first device without waiting for any additional response from the first device. In response to determining that the indicator is configured to allow use of the increased value for the information unit pacing credit that is greater than the default value for the information unit pacing credit, the first device adjusts the information unit pacing credit via a response sent from the first device to the second device, to the increased value that is greater than the default value.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: April 2, 2019
    Assignee: International Business Machines Corporation
    Inventors: Roger G. Hathorn, Bret W. Holley, Harry M. Yudenfriend
  • Patent number: 10211948
    Abstract: A new lower density parity check (LDPC) tone mapper is proposed when DCM is applied for a given resource unit (RU) when LDPC is used as the channel control coding. For HE PPDU transmission with DCM, LDPC encoded streams are first modulated by a DCM constellation mapper. The modulated symbols of the lower half of the frequency segment and the modulated symbols of the upper half of the frequency segment are modulated using the same LDPC encoded bits using DCM mapping. The modulated symbols of the lower half of the frequency segment are mapped to lower half of the data subcarriers using DCM LDPC tone mapper. The modulated symbols of the upper half of the frequency segment are mapped to upper half of the data subcarriers using the same DCM LDPC tone mapper. Maximum frequency diversity for DCM can be achieved.
    Type: Grant
    Filed: October 11, 2016
    Date of Patent: February 19, 2019
    Assignee: MEDIATEK INC.
    Inventors: Jianhan Liu, Shengquan Hu, Tianyu Wu, Thomas Edward Pare, Jr.
  • Patent number: 10200228
    Abstract: A method of interleaver design for dual carrier modulation (DCM) is proposed in a wireless network. For HE PPDU transmission with DCM, information bits are first encoded by a BCC encoder. The BCC encoded bit streams are then interleaved by a BCC interleaver. More specifically, the BCC interleaved bits are repeated on two halves of a given resource unit (RU). The BCC interleaver parameters are defined based on half of the total number of the data tones of the RU if DCM is applied. The BCC interleaved bits are then modulated and mapped to two halves of the RU by a DCM constellation mapper.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: February 5, 2019
    Assignee: MEDIATEK INC.
    Inventors: Tianyu Wu, Jianhan Liu, Gary A. Anwyl, Thomas Edward Pare, Jr.
  • Patent number: 10200171
    Abstract: A method of encoding a first bit and a second bit for transmission on a transmission band is provided. The method includes: mapping, via a mapping component, the first bit and the second bit into a first symbol; mapping, via the mapping component, the first bit and the second bit into a second symbol; dividing, via a dividing component, the transmission band into subcarriers; allocating, via an allocating component, the first symbol to a first subcarrier of the subcarriers; allocating, via the allocating component, the second symbol to a second subcarrier of the subcarriers; and differentially encoding, via a differential encoder, the first symbol and the second symbol.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: February 5, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jing Lin, Tarkesh Pande, Il Han Kim, Anuj Batra
  • Patent number: 10193567
    Abstract: A network interface devices receives a plurality of bits, and encodes the plurality of bits into a plurality of bit blocks that includes a first set of bit blocks and a second set of bit blocks. The network interface device transcodes the first set of bit blocks to generate a third set of bit blocks, and aggregates the second set of bit blocks and the third set of bit blocks into an aggregated set of bit blocks. A first error correction encoder encodes a first portion of the bits in the aggregated set of bit blocks to generate a first set of encoded bits. A second error correction encoder encodes a second portion of the bits in the aggregated set of bit blocks to generate a second set of encoded bits. The network interface modulates the first set of encoded bits and the second set of encoded bits.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: January 29, 2019
    Assignee: Marvell International Ltd.
    Inventor: William Lo
  • Patent number: 10177948
    Abstract: Provided is a transmission method that contributes to an increase in data reception quality when iterative detection is performed at a receive apparatus side. A transmit apparatus alternates between two types of modulation scheme that each shift amplitude and phase, performs mapping to constellation points according to a selected modulation scheme, and transmits a modulated signal obtained by mapping.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: January 8, 2019
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10122562
    Abstract: A method and an apparatus for transmitting and receiving data in a filter bank based multicarrier communication system are provided. The method includes receiving a plurality of data blocks and performing an Inverse Fast Fourier Transform (IFFT) operation on the plurality of data blocks, multiplying the plurality of data blocks on which IFFT has been performed and time axis filter coefficients, and transmitting a result obtained by adding the plurality of multiplied data blocks as a multi carrier signal.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: November 6, 2018
    Assignees: Samsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Chan-Hong Kim, Soo-Yong Choi, Sang-Woo Kim, Hyung-Ju Nam, Moon-Chang Choi
  • Patent number: 10116484
    Abstract: Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may identify groups of bits of a particular size; map the groups of bits, with corresponding parity bits, to an even-exponent modulation constellation to generate an odd-exponent modulation constellation, wherein at least one corresponding parity bit, of the corresponding parity bits, is added to a group of bits, of the groups of bits, for the mapping; and transmit a signal based at least in part on the odd-exponent modulation constellation. Numerous other aspects are provided.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: October 30, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Tuhin Subhra Chakraborty, Ashutosh Deepak Gore
  • Patent number: 10097386
    Abstract: The embodiments of disclosure disclose a method and device for multiuser superposition transmission and a method and device for demodulating multiuser information transmission. In the method, two bit information streams are respectively modulated into a first complex symbol sequence and a second complex symbol sequence; superposition processing on the first complex symbol sequence and the second complex symbol sequence is performed to generate a third complex symbol sequence, wherein the third complex symbol sequence has a Gray mapping attribute; and a sending signal is formed according to the third complex symbol sequence, and the sending signal is sent to multiple receivers.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: October 9, 2018
    Assignee: ZTE CORPORATION
    Inventors: Zhifeng Yuan, Jianqiang Dai
  • Patent number: 10097395
    Abstract: A transmitting apparatus for modulating data based on a predetermined 2q-QAM constellation and a receiving apparatus and method for demodulating a signal based on the predetermined 2q-QAM constellation, wherein the last q-2 bits corresponding to a quadrant of the predetermined 2q-QAM constellation are same with a gray code of a 2q-2-QAM constellation, the last q-2 bits corresponding to the remaining quadrants of the predetermined 2q-QAM constellation are determined by performing symmetric transformation for the last q-2 bits of the quadrant of the predetermined 2q-QAM around the x-axis or the y-axis.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: October 9, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Bing Hui, Junhyeong Kim, Il Gyu Kim, Hoon Lee, Hee Sang Chung, Sung woo Choi
  • Patent number: 10098073
    Abstract: A radio base station applies non-orthogonal multiple access to a plurality of user terminals and transmits downlink signals, and this radio base station has a scheduling section that selects a user set to apply non-orthogonal multiple access to from candidate user sets, and selects a combination of a modulation and coding scheme and transmission power based on combinations of candidate transmission power. The radio base station includes a control section that decides whether or not the combination of the modulation and coding scheme and transmission power selected in the scheduling section is included in combinations that are stipulated in advance, and controls the scheduling section in accordance with the decision. A transmission section applies the combination of the modulation and coding scheme and transmission power to user terminals that are included in the user set selected in the scheduling section, and transmits the downlink signals.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: October 9, 2018
    Assignee: NTT DOCOMO, INC.
    Inventors: Anass Benjebbour, Yoshihisa Kishiyama
  • Patent number: 10063402
    Abstract: A communication device determines an estimate of a communication channel, and determines, based on the estimate of the communication channel, a plurality of bit rates to be used for a data unit, including: determining a first bit rate for a first set of one or more orthogonal frequency division multiplexing (OFDM) subcarriers, and determining a second bit rate for a second set of one or more OFDM subcarriers, the second bit rate being different than the first bit rate. The communication device generates the data unit for transmission, wherein i) all data modulated on the first set of one or more OFDM subcarriers corresponds to the first bit rate and ii) all data modulated on the second set of one or more OFDM subcarriers corresponds to the second bit rate.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: August 28, 2018
    Assignee: Marvell International Ltd.
    Inventors: Hongyuan Zhang, Hui-Ling Lou, Songping Wu
  • Patent number: 10009150
    Abstract: Methods, apparatuses and a user equipment for performing a Hybrid Automatic Repeat Request (HARQ) transmission in a downlink from a base station to at least one user equipment are provided. An exemplary method comprises receiving a HARQ feedback to a HARQ transmission performed with respect to a transport block. The method further comprises determining whether the HARQ feedback is an ambiguous HARQ feedback with respect to a negative acknowledgement or a discontinuous transmission. The method additionally comprises setting (S206) the ambiguous HARQ feedback as the negative acknowledgement or the discontinuous transmission based on the number of HARQ transmissions having been performed and the corresponding received HARQ feedbacks within a target number of HARQ transmissions counting from a first HARQ transmission. With the methods and apparatuses, the ambiguity of the HARQ feedback can be overcome and communication efficiency may be improved.
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: June 26, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Yongquan Qiang, Hong Ren, Ping Yu, Feng Li, Yang Tian
  • Patent number: 10003399
    Abstract: A communication system and method for a deep space spacecraft receiver to perform post-processing to dynamically combine received signal power coherently for pre-processed signal streams radiated non-coherently from a distributed, multiple element, Ka-band transmitting array via multiple concurrent propagation paths. Mutually orthogonal data and pilot signals travel though the multiple propagation paths. A pre-processor utilizing wavefront multiplexing restructures signal streams on the ground into multi-channel wavefrom structures along with injections of pilot signals for diagnostic and probing purposes. These restructured, or “wavefront multiplexed” (WFM) signals are transmitted through propagation channels to a receiver on the spacecraft, wherein adaptive equalization and wavefront de-multiplexing coherently separates the mixtures of received WFM signals.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: June 19, 2018
    Assignee: Spatial Digital Systems, Inc.
    Inventor: Donald C. D. Chang
  • Patent number: 10003407
    Abstract: An efficient coding and modulation system for transmission of digital data over plastic optical fibers with low latency. In particular, the digital signal is coded by means of a two-level coset coding. The first level applies to the digital data a binary shortened BCH coding and performs coset partitioning by means of constellation mapping and lattice transformations. The second level is uncoded but undergoes mapping and lattice transformation. After an addition of the two levels, a second-stage lattice transformation is performed so as to obtain a zero-mean constellation. The symbols output from such three-level coset coder are then further modulated.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: June 19, 2018
    Assignee: Knowledge Development for POF, S.L.
    Inventors: Ruben Perez De Aranda Alonso, David Ortiz, Dunia Prieto
  • Patent number: 10003432
    Abstract: A modulation coding scheme (MCS) is selected i) from a first set of MCSs when the PHY data unit is to be transmitted using a first channel bandwidth, and ii) from a second set of MCSs when the PHY data unit is to be transmitted using a second channel bandwidth. The first set of MCSs corresponds to i) a number of spatial streams, and ii) the first channel bandwidth, the second set of MCSs corresponds to i) the number of spatial streams, and ii) the second channel bandwidth. The second set of MCSs excludes one or more MCSs in the first set of MCSs that will result in a padding-related constraint not being met when the second channel bandwidth is to be used. Information bits are encoded according to the selected MCS, and modulated according to the selected MCS.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: June 19, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Sudhir Srinivasa, Hongyuan Zhang, Rohit U. Nabar
  • Patent number: 9998229
    Abstract: Consistent with an aspect of the present disclosure, optical signals are transmitted that are modulated in accordance with an 8QAM modulation format. The optical signals carry symbols of data and may be represented by a constellation in the IQ plane that includes four inner points that are symmetrically arranged about the origin, and four outer points that are uniformly distributed about the origin, but rotated relative to the inner points. The rotation is toward inner points that represent symbols for which an erroneous transition between the outer points and such inner points is more likely to result in a single bit error, instead of two bit errors, because the symbol corresponding to the outer point and the symbol corresponding to such inner point differ by just one bit. Accordingly, a binary forward error correction algorithm may be employed to correct the errored bit.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: June 12, 2018
    Inventors: Jeffrey T. Rahn, Han Henry Sun
  • Patent number: 9998318
    Abstract: The present invention relates to a transmit diversity method for FQAM and an apparatus therefor. According to the present invention, a transmit diversity method for FQAM and apparatus therefor are provided, the transmit diversity method comprising the steps of: modulating data into at least one FQAM symbol; interleaving a plurality of tones constituting the at least one FQAM symbol such that tones having the same index are located in adjacent resources; and transmitting the at least one interleaved FQAM symbol through at least one transceving unit.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: June 12, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Min Sagong, Keonkook Lee, Sungnam Hong
  • Patent number: 9948489
    Abstract: The present invention provides a method of transmitting broadcast signals. The method includes, processing input streams into plural PLPs; encoding data of the each PLPs according to code rates, wherein the encoding data of the each PLPs further includes, encoding data of at least one PLP with LDPC codes, bit interleaving the LDPC encoded data of the PLP, mapping the bit interleaved data onto a set of constellations according to the code rate, MIMO encoding the mapped data, and time interleaving the MIMO encoded data; building at least one signal frame by mapping the encoded data of the each PLPs; and modulating data in the built signal frame by OFDM method and transmitting the broadcast signals having the modulated data, wherein the bit interelaved data of each PLPs are mapped by using either QAM, NUQ, or NUC.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: April 17, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Byeongkook Jeong, Woosuk Ko, Youngjin Hong, Sungryong Hong, Jaeho Hwang
  • Patent number: 9948442
    Abstract: A method for transmitting control information via a PUCCH in a wireless communication system and an apparatus for performing the method are provided, the method including joint-coding a plurality of pieces of control information to obtain a single code word; obtaining a first modulated symbol sequence from the single code word; obtaining a plurality of second modulated symbol sequences corresponding to each slot in the PUCCH from the first modulated symbol sequence; cyclically shifting the plurality of second modulated symbol sequences in a time domain to obtain a plurality of third modulated symbol sequences; performing a Discrete Fourier Transform (DFT) precoding process on the plurality of third modulated symbol sequences to obtain a plurality of complex symbol sequences in a frequency domain; and transmitting the plurality of complex symbol sequences via the PUCCH.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: April 17, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Seung Hee Han, Sung Ho Moon, Jae Hoon Chung, Moon Il Lee, Yeong Hyeon Kwon
  • Patent number: 9929884
    Abstract: Systems and methods for detecting data in a received multiple-input-multiple-output signal are provided. N signals are received from N antennas, with M being greater than or equal to three. The N signals form a vector y and are associated with M sets of data values, where the M sets of data values form a vector x. A channel matrix (H) is estimated, and a QR decomposition of the channel matrix is performed, such that H=QR. The vector y is transformed into a vector z according to z=QHy. The R matrix and the rotated signal vector z are transformed such that one or more elements of the R matrix having complex number values are set equal to zero. Distance values are calculated using the transformed vector z and the vector x. Log likelihood ratio (LLR) values are calculated based on the distance values.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: March 27, 2018
    Assignee: MARVELL WORLD TRADE LTD.
    Inventors: B Hari Ram, Lokesh Sundaramurthy Satrasala, Sri Varsha Rottela
  • Patent number: 9929785
    Abstract: The present invention provides a method of transmitting broadcast signals, the method including encoding service data, building at least one signal frame by mapping the encoded service data, modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplexing, OFDM, scheme and transmitting the broadcast signals having the modulated data.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: March 27, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Sangchul Moon, Woosuk Ko, Sungryong Hong, Jinwoo Kim, Jongwoong Shin
  • Patent number: 9900205
    Abstract: Apparatus and methods disclosed herein perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms. Gain compensation coefficients are iteratively converged, clipping levels are established, and data flowing through the network is gain and clipping compensated. A compensation phase angle and phase compensation coefficients are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data to yield a gain, clipping, and phase compensated data stream.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: February 20, 2018
    Assignee: Texas Instruments Incorporated
    Inventors: Raghu Ganesan, Bijoy Bhukania, Jaiganesh Balakrishnan
  • Patent number: 9893841
    Abstract: The present invention discloses an ML (Maximum Likelihood) detector. An embodiment of the ML detector comprises a search value selecting circuit and an ML detecting circuit. The search value selecting circuit is configured to select a first-layer search value. The ML detecting circuit is configured to carry out the following steps: selecting first-layer candidate values according to the first-layer search value, one of a reception signal and a derivative thereof, and one of a channel estimation signal and a derivative thereof, and adding one or more first-layer candidate value(s), if necessary; calculating second-layer candidate values according to all the above-mentioned first-layer candidate values, and adding one or more second-layer candidate value(s) and its/their corresponding first-layer candidate value(s), if necessary; and calculating log likelihood ratios according to the whole first-layer and second-layer candidate values.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: February 13, 2018
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Chung-Yao Chang, Chuan-Hu Lin, Yi-Syun Yang
  • Patent number: 9882762
    Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium for receiving, by a first device, a first signal from a second device, the first signal including a carrier signal modulated with a first modulation signal. Detecting a frequency of the carrier signal by performing a carrier extraction (CAREX) process on the first signal. Adding a second modulation signal to the carrier signal of the first signal to produce a combined signal, wherein the second modulation signal is a transpositional modulation (TM) signal and the first modulation signal is a non-TM signal. Transmitting the combined signal.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: January 30, 2018
    Assignee: TM IP Holdings, LLC
    Inventors: Richard C. Gerdes, Daniel L. Hodges, Quinn Colin McIntosh
  • Patent number: 9871623
    Abstract: A Viterbi decoding apparatus includes a main decoder, a re-encoder, an adjusting module, a secondary decoder and a secondary result generating module. The main decoder performs a Viterbi decoding process on input data to generate a set of main decoded results. The re-encoder performs a convolutional encoding process on the set of main decoded results to generate a set of re-encoded results. The adjusting module adjusts the input data according to the set of re-encoded results to generate adjusted input data corresponding to a predetermined path in a Viterbi trellis diagram. The secondary decoder generates a plurality of symbols according to the adjusted input data. The secondary result generating module generates a set of secondary decoded results according to the plurality of symbols and the set of main decoded results.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: January 16, 2018
    Assignee: MStar Semiconductor, Inc.
    Inventors: Jean-Louis Dornstetter, Hsin-Chuan Kuo
  • Patent number: 9871537
    Abstract: This disclosure describes techniques for binary arithmetic coding in video coding, and video encoders and decoders for performing such techniques. In some examples, the techniques may support binary arithmetic coding that supports slower adaptation rates and accounts more extreme probabilities (i.e., probabilities closer to 0 and 1) while maintaining relatively small tables.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: January 16, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Joel Sole Rojals, Marta Karczewicz
  • Patent number: 9870014
    Abstract: A regulator may comprise: an ADC unit for detecting a change in an output voltage and outputting an error code based on the detected result; a digital processing unit for generating a proportional control signal, a plurality of integral control signals, a counting signal, and an error sign signal based on the error code, outputting pull-up and pull-down control signals by multiplying the error code by a proportional gain factor in response to the proportional control signal, and outputting a plurality of sub-pull-up control signals by performing integration on the integral control signals based on the counting signal and multiplying the integration result by an integral gain factor; a first driving unit for outputting a first current in response to the pull-up and pull-down control signals; and a second driving unit for outputting a second current in response to the sub-pull-up control signals.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: January 16, 2018
    Assignees: SK Hynix Inc., THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Hyun-Ju Ham, Jong-Hwan Kim, Min-Goo Seok, Do-Yun Kim