公开(公告)号：US20240323067A1

公开(公告)日：2024-09-26

申请号：US18678342

申请日：2024-05-30

申请人： L3HARRIS TECHNOLOGIES, INC.

发明人： NICHOLAS T. YASKOFF ,  MARC A. PADILLA ,  DAVID M. ARNESEN

IPC分类号： H04L27/227 ,  H04B1/7087 ,  H04B1/709 ,  H04L5/00

CPC分类号： H04L27/2278 ,  H04B1/7087 ,  H04B1/709 ,  H04L5/0048

摘要： A radio frequency (RF) communications system may include a first RF node that transmits data, including a new frequency of operation, and a sequence of pilot symbols spread with a complex spreading code sequence. A second RF node may receive an incoming signal from the first RF node and perform despreading for N sample offset delays to generate N despreading sequences for the sequence of pilot symbols. The second RF node may perform a cross-correlation to select a desired despreading sequence from the N despreading sequences, determine a phase offset and timing offset, process the incoming signal based upon the desired despreading sequence, phase offset and timing offset, and switch to the new frequency of operation.

公开(公告)号：US20240235908A1

公开(公告)日：2024-07-11

申请号：US18060612

申请日：2022-12-01

申请人： L3HARRIS TECHNOLOGIES, INC.

发明人： NICHOLAS T. YASKOFF ,  MARC A. PADILLA ,  DAVID M. ARNESEN

IPC分类号： H04L27/227 ,  H04B1/7087 ,  H04B1/709 ,  H04L5/00

CPC分类号： H04L27/2278 ,  H04B1/7087 ,  H04B1/709 ,  H04L5/0048

摘要： A radio frequency (RF) communications system may include a first RF node that transmits data, including a new frequency of operation, and a sequence of pilot symbols spread with a complex spreading code sequence. A second RF node may receive an incoming signal from the first RF node and perform despreading for N sample offset delays to generate N despreading sequences for the sequence of pilot symbols. The second RF node may perform a cross-correlation to select a desired despreading sequence from the N despreading sequences, determine a phase offset and timing offset, process the incoming signal based upon the desired despreading sequence, phase offset and timing offset, and switch to the new frequency of operation.

公开(公告)号：US20240176387A1

公开(公告)日：2024-05-30

申请号：US18485814

申请日：2023-10-12

申请人： ANRITSU CORPORATION

发明人： Kazuhiro YAMANE

IPC分类号： G06F1/12 ,  H04B1/7087

CPC分类号： G06F1/12 ,  H04B1/7087

摘要： A clock recovery circuit includes a reference clock generation unit that generates a reference clock subjected to SSC modulation, a clock recovery unit that recovers an SSC modulated clock of a data signal subjected to the SSC modulation in synchronization with the reference clock, and a modulation signal generation unit that generates a modulation signal based on cycle information indicating a cycle of a FM demodulated signal obtained by performing FM demodulation on the SSC modulated clock recovered by the clock recovery unit and slope information indicating a slope of the FM demodulated signal, in which the reference clock generation unit generates the reference clock by performing the SSC modulation on a clock of a VCO with the modulation signal, and feeds back the reference clock subjected to the SSC modulation to the clock recovery unit.

公开(公告)号：US20230327704A1

公开(公告)日：2023-10-12

申请号：US18005974

申请日：2021-10-19

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Li WANG ,  Weijia CHEN

IPC分类号： H04B3/46 ,  H04B3/54 ,  H04B1/7087

CPC分类号： H04B3/46 ,  H04B1/7087 ,  H04B3/54

摘要： A method for implementing fault diagnosis by means of a spread spectrum carrier includes the following steps: designing incident signal parameters, selecting a spread spectrum sequence for fault detection, determining a center frequency and a sequence length of a spread spectrum code, and segmenting and transforming a power carrier source signal; using the fault detection spread spectrum sequence as a carrier spread spectrum code, and performing spread spectrum modulation on the transformed power carrier source signal to generate an SSPLCR sequence; coupling the SSPLCR sequence to a cable to be tested, and when the cable works normally without failure, transmitting the SSPLCR signal to the receiving terminal via the cable; when the cable fails, reflecting the SSPLCR signal back to the transmitting terminal.

公开(公告)号：US20230308130A1

公开(公告)日：2023-09-28

申请号：US18324830

申请日：2023-05-26

申请人： NextNav, LLC

发明人： Arun RAGHUPATHY ,  Ganesh PATTABIRAMAN ,  Subramanian S. MEIYAPPAN ,  Hari SANKAR

IPC分类号： H04B1/7087 ,  G01S19/11 ,  H04W72/30 ,  H04W72/51 ,  G01S19/46 ,  G01S5/10 ,  G01S1/08 ,  G01S19/24 ,  G01S19/42 ,  H04B7/26 ,  H04W72/0446 ,  H04B1/709

CPC分类号： H04B1/7087 ,  G01S19/11 ,  H04W72/30 ,  H04W72/51 ,  G01S19/46 ,  G01S5/10 ,  G01S1/08 ,  G01S19/24 ,  G01S19/42 ,  H04B7/2618 ,  H04W72/0446 ,  H04B1/709 ,  H04B2201/7073 ,  H04W56/005

摘要： Systems and methods are described for determining position of a receiver. The positioning system comprises a transmitter network including transmitters that broadcast positioning signals. The positioning system comprises a remote receiver that acquires and tracks the positioning signals and/or satellite signals. The satellite signals are signals of a satellite-based positioning system. A first mode of the remote receiver uses terminal-based positioning in which the remote receiver computes a position using the positioning signals and/or the satellite signals. The positioning system comprises a server coupled to the remote receiver. A second operating mode of the remote receiver comprises network-based positioning in which the server computes a position of the remote receiver from the positioning signals and/or satellite signals, where the remote receiver receives and transfers to the server the positioning signals and/or satellite signals.

公开(公告)号：US11728912B2

公开(公告)日：2023-08-15

申请号：US17478465

申请日：2021-09-17

申请人： ISCO International, LLC

发明人： Amr Abdelmonem

IPC分类号： H04B17/00 ,  H04B17/336 ,  H04W24/08 ,  H04L27/26 ,  H04L25/03 ,  H04B1/04 ,  H04B1/711 ,  H04B1/715 ,  H04J11/00 ,  H04L25/08 ,  H04B1/10 ,  H04B1/71 ,  H04W24/10 ,  H04B17/18 ,  H04W72/541 ,  H04B17/318 ,  H04B1/7087

CPC分类号： H04B17/336 ,  H04B1/0475 ,  H04B1/1036 ,  H04B1/71 ,  H04B1/711 ,  H04B1/715 ,  H04B17/18 ,  H04J11/0023 ,  H04J11/0026 ,  H04J11/0063 ,  H04L25/03821 ,  H04L25/08 ,  H04L27/2647 ,  H04L27/2691 ,  H04W24/08 ,  H04W24/10 ,  H04W72/541 ,  H04B1/7087 ,  H04B17/318 ,  H04B2001/1045 ,  H04L27/2623

摘要： A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.

公开(公告)号：US20190058501A1

公开(公告)日：2019-02-21

申请号：US16066087

申请日：2016-05-31

申请人： UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY

发明人： Sung Young LEE ,  Dinh Mao BUI

IPC分类号： H04B1/7087 ,  H04L1/20 ,  H04L27/26 ,  H04L27/20

CPC分类号： H04B1/7087 ,  H04B1/7103 ,  H04B2001/70706 ,  H04L1/203 ,  H04L27/20 ,  H04L27/2017 ,  H04L27/2628

摘要： Disclosed is a method for recovering an original signal in a DS-CDMA system based on complexity reduction. In such a method, first, a partial derivative for rMLL is calculated by using a partial derivative generated by applying fast Fourier transform (FFT) to a reduced negative marginal log likelihood (rMLL) obtained by applying a law of log determinant to a Gaussian process regression (GPR) scheme used for the multi-user detection and thereafter, integrating stochastic gradient descent (SGD). Thereafter, the rMLL is calculated by using the partial derivative for the rMLL and a hyper-parameter is updated to a convergence point until an error gap is converged by repeated calculation of the rMLL. Next, a kernel function used for estimating a matched filter is calculated by using the hyper-parameter estimated through the convergence and the original signal for each of multi-users is recovered by using the kernel function.

公开(公告)号：US09854545B2

公开(公告)日：2017-12-26

申请号：US14733068

申请日：2015-06-08

申请人： GOLDPEAK INNOVATIONS INC

发明人： Kibum Kwon ,  Myungcheul Jung

IPC分类号： H04J3/06 ,  H04W56/00 ,  H04W74/00 ,  H04W76/04 ,  H04L5/00 ,  H04W88/08 ,  H04W92/10 ,  H04B1/7087

CPC分类号： H04W56/0005 ,  H04B1/7087 ,  H04L5/0007 ,  H04L5/001 ,  H04W56/0045 ,  H04W74/004 ,  H04W76/27 ,  H04W88/08 ,  H04W92/10

摘要： Uplink synchronization establishment in a base station which operates a plurality of component carriers according to one embodiment of the present description, is performed in that the base station is connected to a user equipment, sets component carrier aggregation information, generates an uplink timing groups in the set component carrier aggregation, and transmits information on the thus-generated uplink timing groups to the user equipment.

公开(公告)号：US09847809B2

公开(公告)日：2017-12-19

申请号：US15106141

申请日：2014-12-10

申请人： Nordic Semiconductor ASA

发明人： David Alexandre Engelien-Lopes ,  Sverre Wichlund ,  Phil Corbishley

IPC分类号： H03D1/00 ,  H04L27/06 ,  H04B1/7087 ,  H04L27/00 ,  H04L27/227 ,  H04B17/336 ,  H04L5/00 ,  H04W4/00

CPC分类号： H04B1/7087 ,  H04B17/336 ,  H04B2201/69 ,  H04L5/006 ,  H04L27/0014 ,  H04L27/227 ,  H04L2027/0026 ,  H04L2027/0034 ,  H04L2027/0046 ,  H04W4/80

摘要： A digital radio receiver is adapted to receive radio signals modulated using continuous phase modulation. The receiver includes components for receiving analogue radio signals having various carrier frequencies and a plurality of correlators corresponding to different bit sequences. Each of the plurality of correlators share a common estimator for estimating a frequency offset between the radio signals carrier frequencies and nominal carrier frequencies. The receiver further includes components allowing the estimator to determine which of the correlators produce the most optimal output signal.

公开(公告)号：US09692587B2

公开(公告)日：2017-06-27

申请号：US14922345

申请日：2015-10-26

申请人： Higher Ground LLC

发明人： Bruce L. McKinley

IPC分类号： H04L7/00 ,  H04L27/26

CPC分类号： H04L7/002 ,  H04B1/7087 ,  H04L7/0079 ,  H04L27/0014 ,  H04L27/2605 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0067

摘要： Techniques for pilot-aided carrier frequency and phase synchronization may use a three-pass process. In a first pass, initial frequency offset may be addressed, and a frame start time may be established. In a second pass, a fine frequency correction may be performed. In a third pass, phase variation may be tracked and corrected using a minimum set of pilot symbols.