公开(公告)号：US11881767B2

公开(公告)日：2024-01-23

申请号：US16440509

申请日：2019-06-13

Applicant: Texas Instruments Incorporated

Inventor： Joerg Erik Goller

IPC: H02M1/44 ,  G06F7/58 ,  H02M3/158 ,  H04B1/7075 ,  H02M3/04

CPC classification number: H02M1/44 ,  G06F7/584 ,  H02M3/1584 ,  H04B1/70756 ,  H02M3/04 ,  H02M3/1586

Abstract: An integrated circuit. The integrated circuit comprises a timebase generator and a switch mode direct current-to-direct current (DC-to-DC) voltage converter coupled to the timebase generator. The timebase generator comprises a first linear feedback shift register (LFSR), a signal generator having an input coupled to an output of the first LFSR; and a digital divider comprising a second LFSR and a programmable digital divider, wherein a clock input of the programmable digital divider is coupled to an output of the signal generator, wherein an output of the programmable digital divider is coupled to a clock input of the first LFSR and is coupled to a clock input of the second LFSR, and wherein an output of the second LFSR is coupled to a program input of the programmable digital divider.

公开(公告)号：US11855682B2

公开(公告)日：2023-12-26

申请号：US17759916

申请日：2020-02-12

Applicant: ESA—European Space Agency

Inventor： Jose Antonio Garcia Molina ,  Stefan Wallner

IPC: H04B1/7075

CPC classification number: H04B1/7075

Abstract: A system and method of resolving a time ambiguity in a receiver based on a received radio signal. The radio signal includes a first signal component and a second signal component. The first and second signal components include code symbols having durations of time The system and method include acquiring each of the signal components, and performing code symbol synchronization and/or code synchronization for each of the codes. The system and method further include estimating a code phase offset between the synchronized codes, or a code-symbol phase offset between the synchronized code symbols. Finally, the system and method include resolving the time ambiguity of the receiver within a time period based on the time-dependent code phase offset or the time-dependent code-symbol phase offset.

公开(公告)号：US20230065422A1

公开(公告)日：2023-03-02

申请号：US17759916

申请日：2020-02-12

Applicant: ESA - European Space Agency

Inventor： Jose Antonio Garcia Molina ,  Stefan Wallner

IPC: H04B1/7075

Abstract: The invention concerns a method of resolving a time ambiguity in a receiver based on a received radio signal. The radio signal comprises a first signal component and a second signal component. The first signal component comprises a first code of X1 code symbols, the first code having a duration of C1 units of time, wherein each of the code symbols has a duration of St units of time. Likewise, the second signal component comprises a second code of X2 code symbols, the second code having a duration of C2 units of time, wherein each of the code symbols has a duration of S2 units of time. Either, the code duration C1 of the first signal component and the code duration C2 of the second signal component are chosen such that the start or the end of the first code and the second code have a reference code phase offset of D units of time every 2 N units of time, wherein 2N is equivalent to the least common multiple of C1 and C2. Or, the code duration C1 of the first signal component and the code symbol duration S2 of the second signal component are chosen such that the start or the end of the first code and the second code symbol have a reference code phase offset of D units of time every 2N units of time, wherein 2N is equivalent to the least common multiple of C1 and S2. The method comprises acquiring each of the first and second signal components, and performing code symbol synchronization and/or code synchronization for each of the first code and the second code. The method further comprises estimating a code phase offset between the synchronized first code and the synchronized second code, or a code-symbol phase offset between the synchronized first code and the synchronized second code symbol. Finally, the method comprises resolving the time ambiguity of the receiver within a ±N units of time period based on the time-dependent code phase offset or the time-dependent code-symbol phase offset. The invention further concerns radio signal devices.

公开(公告)号：US20220376875A1

公开(公告)日：2022-11-24

申请号：US17881503

申请日：2022-08-04

Applicant: Godo Kaisha IP Bridge 1

Inventor： Seigo Nakao ,  Daichi Imamura ,  Yoshihiko Ogawa ,  Atsushi Matsumoto ,  Katsuhiko Hiramatsu

IPC: H04L5/00 ,  H04B1/7075 ,  H04J13/00 ,  H04L1/00 ,  H04L1/16 ,  H04J11/00 ,  H04L27/00 ,  H04W24/02 ,  H04W72/04

Abstract: It is possible to improve the CQI reception performance even when a delay is caused in a propagation path, a transmission timing error is caused, or a residual interference is generated between cyclic shift amounts of different ZC sequences. For the second symbol and the sixth symbol of the ACK/NACK signal which are multiplexed by RS of CQI, (+, +) or (−, −) is applied to a partial sequence of the Walsh sequence. For RS of CQI transmitted from a mobile station, + is added as an RS phase of the second symbol and − is added as an RS phase of the sixth symbol. A base station (100) receives multiplexed signals of ACK/NACK signals and CQI signals transmitted from a plurality of mobile stations. An RS synthesis unit (119) performs synthesis by aligning the RS phase of CQI.

公开(公告)号：US20220294488A1

公开(公告)日：2022-09-15

申请号：US17746742

申请日：2022-05-17

Applicant: ENSCO, Inc.

Inventor： Daniel Thomas GOFF ,  William Todd FAULKNER ,  Robert Barlow ALWOOD ,  Bradley David FARNSWORTH ,  Edward Joseph KREINAR ,  David W. A. TAYLOR, JR.

IPC: H04B1/7087 ,  H04J3/06 ,  H04B1/7075

Abstract: Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices.

公开(公告)号：US20220255581A1

公开(公告)日：2022-08-11

申请号：US17578162

申请日：2022-01-18

Applicant: Lawrence J. Karr

Inventor： Lawrence J. Karr

IPC: H04B1/7075 ,  H04B1/7077

Abstract: A round-trip, spread-spectrum navigation and locating system achieves high capacity and large processing gains in one-to-many and many-to-one configurations using round-trip signaling with frequency division based upon precise responding device carrier frequency offsets. Reduced cross-correlation is achieved by assigning these very small disparate frequency offsets to replies from interrogated devices so that the long-term correlation between disparate reply sequences is reduced almost to that of random noise of equivalent energy. The invention supports simultaneous interrogation of multiple responding devices, which responding devices respond essentially simultaneously at a fixed delay after receiving the query. The originating and/or responding devices may be fixed or mobile, permanently or temporarily deployed, terrestrial, airbourne or space-based with any source of power including batteries and solar without limitation. The signaling may be electromagnetic or acoustic with the potential for under-water use.

公开(公告)号：US11387542B2

公开(公告)日：2022-07-12

申请号：US16912746

申请日：2020-06-26

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Hideaki Kobayashi ,  Kenichi Ishizuka

IPC: H04B1/00 ,  H01Q1/22 ,  H03H7/40 ,  H04B1/7075

Abstract: An antenna apparatus includes an antenna element, a switch with a common terminal that is electrically connected to the antenna element side, a first signal path provided between a first input/output terminal of the switch and a first communication circuit, and a second signal path provided between a second input/output terminal of the switch and a second communication circuit. The first signal path includes a radio-frequency circuit and a phase shifter, and the RF circuit has an impedance that is open or shorted in a second frequency band as seen from the antenna element side. In a state in which the first input/output terminal and the second input/output terminal are both electrically connected to the common terminal, the phase shifter provides a phase shift, and the impedance in the second frequency band of the first signal path as seen from the common terminal is open.

公开(公告)号：US11368183B2

公开(公告)日：2022-06-21

申请号：US16908255

申请日：2020-06-22

Applicant: ENSCO, Inc.

Inventor： Daniel Thomas Goff ,  William Todd Faulkner ,  Robert Barlow Alwood ,  Bradley David Farnsworth ,  Edward Joseph Kreinar ,  David W. A. Taylor, Jr.

IPC: H04W4/00 ,  H04B1/7087 ,  H04J3/06 ,  H04B1/7075

Abstract: Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices.

公开(公告)号：US11169275B2

公开(公告)日：2021-11-09

申请号：US16471516

申请日：2017-01-26

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Naoto Yoshida ,  Nobuhiro Suzuki

IPC: G01S19/30 ,  G01S19/24 ,  G01S19/37 ,  H04B1/7075 ,  H04B1/7085 ,  H04B1/709

Abstract: A signal acquiring unit (3) performs signal detection and initial synchronization on an output from a RF frontend (2) by performing circular convolution operation using a first code replica corresponding to a case where a ranging code does not change in polarity and a second code replica corresponding to a case where a ranging code changes in polarity. A signal tracking unit (4) performs synchronization tracking using a result of signal acquisition output from the signal acquiring unit (3) as an initial value.

公开(公告)号：US11070246B2

公开(公告)日：2021-07-20

申请号：US16466624

申请日：2017-12-01

Applicant: Nordic Semiconductor ASA

Inventor： Wei Li

IPC: H04B1/7075 ,  H04B17/20 ,  H04B1/16

Abstract: A method of operating a digital radio receiver comprising: receiving a radio signal; passing said radio signal to a correlator for correlating said radio signal with a predetermined pattern to provide an output signal comprising a plurality of peaks separated in time; determining an amplitude of a first peak in the plurality of peaks; calculating a selection threshold based on said first peak amplitude; determining an amplitude of a second peak in the plurality of peaks; comparing said second peak amplitude to the selection threshold; and identifying the second peak as a correlation peak if the second peak amplitude is greater than the selection threshold.