公开(公告)号：US20240306180A1

公开(公告)日：2024-09-12

申请号：US18663370

申请日：2024-05-14

申请人： ISCO International, LLC

发明人： Amr Abdelmonem ,  Mikhail Galeev ,  Dariusz Seskiewicz ,  Bill Myers ,  Ted Myers

IPC分类号： H04W72/541 ,  H04B1/10 ,  H04B1/709 ,  H04B1/71 ,  H04B1/7103 ,  H04B7/26 ,  H04B15/00 ,  H04B17/00 ,  H04B17/21 ,  H04B17/26 ,  H04B17/327 ,  H04B17/345 ,  H04B17/373 ,  H04J11/00 ,  H04L5/00 ,  H04L41/069 ,  H04W4/02 ,  H04W4/029 ,  H04W16/28 ,  H04W24/02 ,  H04W24/08 ,  H04W24/10 ,  H04W28/02 ,  H04W28/04 ,  H04W40/16 ,  H04W52/04 ,  H04W52/14 ,  H04W52/24 ,  H04W64/00 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/52 ,  H04W72/54 ,  H04W72/542

CPC分类号： H04W72/541 ,  H04B1/1036 ,  H04B1/709 ,  H04B1/71 ,  H04B1/7103 ,  H04B15/00 ,  H04B17/00 ,  H04B17/21 ,  H04B17/26 ,  H04B17/327 ,  H04B17/345 ,  H04B17/373 ,  H04L5/0007 ,  H04L5/0026 ,  H04L5/0032 ,  H04L5/0073 ,  H04L41/069 ,  H04W4/02 ,  H04W4/023 ,  H04W4/029 ,  H04W16/28 ,  H04W24/02 ,  H04W24/08 ,  H04W24/10 ,  H04W28/0236 ,  H04W28/04 ,  H04W40/16 ,  H04W52/04 ,  H04W52/14 ,  H04W52/243 ,  H04W64/00 ,  H04W64/006 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/52 ,  H04W72/54 ,  H04W72/542 ,  H04B7/2634 ,  H04B2201/709709 ,  H04B2201/709745 ,  H04J11/0066 ,  H04L5/006

摘要： A system includes a method for detecting a signal interference in a communication signal of a wireless communication system. An identified source of the signal interference is determined according to an interference profile of a plurality of interference profiles associated with an interference profile library having information that approximates characteristics of the signal interference. The signal interference of the communication signal is mitigated according to an interference parameter associated with the identified source by filtering the communication signal according to the interference parameter.

公开(公告)号：US12015511B1

公开(公告)日：2024-06-18

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： H04B1/69 ,  H04B1/707 ,  H04B1/7087 ,  H04B1/709 ,  H04B1/713 ,  H04L5/00 ,  H04L27/227

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：US11929778B2

公开(公告)日：2024-03-12

申请号：US17750913

申请日：2022-05-23

申请人： Spectric Labs, Inc.

发明人： Marc Severo ,  Anuj Junankar

IPC分类号： H04B1/709 ,  H04B1/707 ,  H04B1/7093 ,  H04B1/7176

CPC分类号： H04B1/709 ,  H04B1/707 ,  H04B1/7093 ,  H04B1/7176

摘要： A method for transmitting covertly employs three features in a novel combination to create a transmission waveform that has no detectable artifacts. First, the method employs spread spectrum, such as a direct sequence spread spectrum signal, to transmit the power level below the noise floor. Second, the method modulates the phase of each chip in the spread spectrum signal using a chaotic sequence. Third, the method filters the transmission signal using a pulse shaped filter to depress blind detection features in the amplitude modulation and higher order power spectral densities. The novel combination of these features results in a practically invisible and undetectable transmission waveform. Many other features are disclosed herein to optimize this combination.

公开(公告)号：US11791855B2

公开(公告)日：2023-10-17

申请号：US17649081

申请日：2022-01-27

申请人： BAE Systems Information and Electronic Systems Intergration Inc.

发明人： Michael A. Young ,  Anthony J. Crawford ,  Christopher M. Alix ,  Nathan Alix

IPC分类号： H04B1/18 ,  H04B1/16 ,  H04B1/709 ,  H04B1/10 ,  H04B1/7093

CPC分类号： H04B1/18 ,  H04B1/1027 ,  H04B1/1607 ,  H04B1/709 ,  H04B2001/1072 ,  H04B2001/70935

摘要： A radio frequency (RF) receiver includes a transceiver, a programmable logic device (PLD), and a digitally tunable high-pass and low-pass filter bank. The transceiver is configured to receive a mission data file (MDF) specifying a plurality of RF frequencies to be tuned by the receiver and to convert the MDF into a binary file. The PLD is configured to receive the binary file from the transceiver and, based on the binary file, to transmit one or more commands that cause the filter bank to enter a selected one of a plurality of predefined filter states corresponding to one or more of the RF frequencies. In operation, the receiver receives an input signal and the filter bank dynamically filters the input signal in response to the one or more commands from the PLD.

公开(公告)号：US20230194730A1

公开(公告)日：2023-06-22

申请号：US18109503

申请日：2023-02-14

申请人： Topcon Positioning Systems, Inc.

发明人： ANDREY VLADIMIROVICH VEITSEL ,  LEONID VICTOROVICH PURTO ,  DMITRY ANATOLYEVICH RUBTSOV

IPC分类号： G01S19/30 ,  G01S19/24 ,  H04B1/709 ,  G01S19/37 ,  H04B1/7073

CPC分类号： G01S19/30 ,  G01S19/243 ,  H04B1/709 ,  G01S19/37 ,  H04B1/7073

摘要： A method of receiving two chip-by-chip multiplexed CSK signals (e.g., GNSS signals) and searching for a non-CSK signal with optimal performance at a given digit capacity of a sampling memory resided in parallel correlators. For CSK signals Prompt, Early and Late results for each of possible code shift are calculated as different sums of four punctured convolutions. Depending on configuration, the method allows to receive both multiplexed CSK signals with lesser quality or one of the CSK signals with better quality. The method can be implemented as an apparatus with four punctured correlators, a set of multipliers by 1 or 2N, another set of multipliers by 1 or 0, summers of four input to one result, a RAM, searchers of maximum, and conditional commutators.

公开(公告)号：US11582763B2

公开(公告)日：2023-02-14

申请号：US17162511

申请日：2021-01-29

申请人： ISCO International, LLC

发明人： Amr Abdelmonem ,  Mikhail Galeev ,  Dariusz Seskiewicz ,  Bill Myers ,  Ted Myers

IPC分类号： H04W72/08 ,  H04L5/00 ,  H04W28/02 ,  H04B17/327 ,  H04W52/14 ,  H04W4/029 ,  H04B1/71 ,  H04W24/08 ,  H04W40/16 ,  H04W16/28 ,  H04B15/00 ,  H04W64/00 ,  H04W72/04 ,  H04W72/12 ,  H04W28/04 ,  H04B17/26 ,  H04B17/345 ,  H04B1/10 ,  H04B1/709 ,  H04B1/7103 ,  H04W72/0446 ,  H04W72/0453 ,  H04L41/069 ,  H04W4/02 ,  H04W24/10 ,  H04W24/02 ,  H04W52/24 ,  H04B17/21 ,  H04B17/373 ,  H04B17/00 ,  H04W52/04 ,  H04B7/26 ,  H04J11/00

摘要： A system includes a method for detecting a signal interference in a communication signal of a wireless communication system. An identified source of the signal interference is determined according to an interference profile of a plurality of interference profiles associated with an interference profile library having information that approximates characteristics of the signal interference. The signal interference of the communication signal is mitigated according to an interference parameter associated with the identified source by filtering the communication signal according to the interference parameter.

公开(公告)号：US20220247448A1

公开(公告)日：2022-08-04

申请号：US17727361

申请日：2022-04-22

申请人： Mitsubishi Electric Corporation

发明人： Megumi FUKUMA ,  Masatsugu HIGASHINAKA

IPC分类号： H04B1/709 ,  H04W52/36

摘要： A receiver includes: a correlation value calculation unit calculating a first cross-correlation function between a received signal, having a preamble spread with an up chirp and a down chirp, and the up chirp and calculating a second cross-correlation function between the received signal and the down chirp; a power value calculation unit calculating first and second power values of the first and second cross-correlation functions; a correlation power memory storing the first and second power values at each sample timing for one period of a spread code; a threshold determination unit determining first and second estimated timings from the first and second power values for one period of the spread code, respectively; and an estimation unit estimating a spread code timing of a transmitter using the first and second estimated timings, and performing coarse estimation of a frequency offset with respect to the transmitter.

公开(公告)号：US11304204B2

公开(公告)日：2022-04-12

申请号：US16837608

申请日：2020-04-01

申请人： ISCO International, LLC

发明人： Mikhail Galeev ,  Amr Abdelmonem ,  Dariusz Seskiewicz ,  Zhigang Wang

IPC分类号： H04L12/26 ,  H04W72/08 ,  H04W72/04 ,  H04W72/12 ,  H04L5/00 ,  H04W28/02 ,  H04W28/04 ,  H04B17/327 ,  H04W52/14 ,  H04W4/029 ,  H04B1/71 ,  H04B17/26 ,  H04B17/345 ,  H04B1/10 ,  H04B1/709 ,  H04B1/7103 ,  H04W24/08 ,  H04L41/069 ,  H04W4/02 ,  H04W24/10 ,  H04W40/16 ,  H04W16/28 ,  H04W24/02 ,  H04W52/24 ,  H04B17/21 ,  H04B17/373 ,  H04B15/00 ,  H04B17/00 ,  H04W52/04 ,  H04W64/00 ,  H04B7/26 ,  H04J11/00

摘要： Aspects of the subject disclosure may include, for example, determining that a number of interferers in a portion of a number of spectral segments exceeds a number of filters of a number of filters. Use of the number of filters to filter interference is prioritized responsive to the number of interferers exceeding the number of filters. Interference is filtered in the portion of the number of spectral segments for suppressing at least a portion of the detected interference.

公开(公告)号：US11075669B2

公开(公告)日：2021-07-27

申请号：US16658186

申请日：2019-10-21

申请人： Xi'an Univeristy of Technology

发明人： Haipeng Ren ,  Chao Bai ,  Jie Li

IPC分类号： H04B1/709 ,  H04B1/7093 ,  G06F17/16 ,  H04L27/00 ,  H04L27/20 ,  H04L27/233

摘要： The present disclosure discloses an M-ary DCSK method based on chaotic shape-forming filtering. The method includes the following steps: at S1, parameters of a communication system are set; at S2, HP information and LP information to be sent in each time slot are prepared; at S3, the information to be sent is modulated; at S4, a chaotic carrier is generated through a chaotic shape-forming filter; at S5, a transmitted signal is prepared; at S6, down-carrier frequency and matched filter is performed to a received signal; at S7, the sampling of a maximum SNR point is performed to an output signal of a matched filter; at S8, the decision of high priority information bits is resumed; and at S9, the decision of low priority information bits is resumed.

公开(公告)号：US11012110B2

公开(公告)日：2021-05-18

申请号：US16989136

申请日：2020-08-10

申请人： NovAtel Inc.

发明人： Patrick C. Fenton ,  David Brown

IPC分类号： H04B1/709

摘要： A Global Navigation Satellite System (GNSS) receiver demodulates code shift keying (CSK) data utilizing a binary search. The GNSS receiver receives a signal including a pseudorandom noise (PRN) code modulated by code shift keying (CSK) to represent a symbol (i.e., CSK modulated symbol). The GNSS receiver maintains a plurality of receiver codes each representing a different shift in chips to the PRN code. The GNSS receiver performs a linear combination of portions of the receiver codes. In an embodiment, the GNSS receiver compares correlation power level value for respective portions of the receiver codes to demodulate the CSK data. In a further embodiment, the GNSS receiver compares the correlation power level values for portions of receiver codes with power detection threshold values to demodulate the CSK data. In a further embodiment, the GNSS receiver utilizes signs of the correlation power level values to demodulate the CSK data.