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公开(公告)号：US20240348328A1
公开(公告)日：2024-10-17
申请号：US18602758
申请日：2024-03-12
CPC分类号： H04B7/1855 , H04W56/0035 , H04W56/0045
摘要： Systems and methods are disclosed herein for frequency adjustment in a wireless network, particularly a Non-Terrestrial Network (NTN). Embodiments of a method performed by a User Equipment (UE) are disclosed. In one embodiment, a method performed by a UE for compensating for a Doppler shift in a wireless network comprises obtaining, from a network node, a characterization of Doppler variations in a particular cell. The method further comprises tuning a local frequency reference, fRef, of the UE to a received downlink frequency for the particular cell and adjusting the local frequency reference, fRef, over time according to the pre-calculated characterization of Doppler variations in the particular cell. In this manner, the communication between the UE and the network node in the presence of large and varying Doppler shifts is enabled. Embodiments related to compensating for timing drift are also disclosed.
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公开(公告)号：US12119922B2
公开(公告)日：2024-10-15
申请号：US18101353
申请日：2023-01-25
申请人： AST & Science, LLC
CPC分类号： H04B7/1858 , H04B7/195 , H04W56/0035 , H04W56/005
摘要： A satellite communication system leverages the carrier offset detection capability of the demodulator contained in an on-board modem of M&C channel. The modem detects the frequency error Δf introduced in the signal path from the output of the base station at ground to the output of baseband conversion on the satellite, by analyzing the baseband signal at the baseband conversion to estimate the received carrier f′c and subtracting it the from the expected frequency (fc).
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公开(公告)号：US12101217B2
公开(公告)日：2024-09-24
申请号：US17351941
申请日：2021-06-18
发明人： Xinxian Li , Hao Tang , Zhenfei Tang , Junchao Li
CPC分类号： H04L27/2666 , H04J11/0086 , H04L5/00 , H04L5/0091 , H04L27/26025 , H04W48/12 , H04W56/0035 , H04L5/0007 , H04L5/0053
摘要： Embodiments of this application provide a communication method, a communications apparatus, and a communications system, to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is inconsistent with a center frequency of a carrier. The method includes: receiving, by a terminal, an SS from a network device; determining, by the terminal, a first PRB grid based on the SS; receiving, by the terminal, first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first PRB grid and a second PRB grid; and determining, by the terminal, the second PRB grid based on the first PRB grid and the first frequency offset.
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公开(公告)号：US12050279B2
公开(公告)日：2024-07-30
申请号：US18199808
申请日：2023-05-19
CPC分类号： G01S5/0027 , G01S13/583 , G01S13/62 , H04W56/0015 , H04W56/0035 , H04W56/005
摘要： A system includes at least a transmitting (Tx) and receiving (Rx) node of a non-terrestrial network (NTN) including one or more non-terrestrial nodes (e.g., operating in earth orbit or extra-terrestrial space). Each node may include a communications interface with antenna elements and a controller, which may include one or more processors and have information of own-node velocity and own-node orientation relative to a common reference frame. Each node may be time synchronized to apply Doppler corrections associated with the node's own motions relative to the common reference frame. Based on the Doppler corrections, each node may determine a relative bearing to the other node. The non-terrestrial node is configured for operation on a non-terrestrial platform (e.g., a satellite in earth orbit), which may be an extra-terrestrial platform operating in spaceflight beyond the earth's atmosphere or in association with a non-Earth solar system object.
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公开(公告)号：US12035263B2
公开(公告)日：2024-07-09
申请号：US17220893
申请日：2021-04-01
发明人： Ayan Sengupta , Le Liu , Alberto Rico Alvarino , Xiao Feng Wang , Mungal Singh Dhanda , Jun Ma , Peter Gaal , Bharat Shrestha , Liangping Ma , Umesh Phuyal
CPC分类号： H04W56/0035 , H04B7/18519 , H04W56/004 , H04W72/21
摘要： Methods, systems, and devices for wireless communications are described in which UEs may communicate with satellites or base stations, or both in a non-terrestrial network. Due to large distances between transmitting devices and receiving devices in a non-terrestrial network, the UE may account for propagation delay and frequency shift of communications with a satellite based on location information of the satellite. The UE may receive first satellite location information from a base station or a satellite, via a broadcast message. The UE may receive second satellite location information from the wireless network node via a unicast message, where both the first satellite location information and the second satellite location information relate to a same satellite. The UE may transmit an uplink communication via the satellite based on at least one of the first satellite location information or the second satellite location information.
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6.发明公开公开(公告)号：US20240205853A1
公开(公告)日：2024-06-20
申请号：US18554554
申请日：2022-04-19
申请人： KOHERENT OY
发明人： Kari LEPPÄNEN , Jussi SALMI
IPC分类号： H04W56/00 , H04W72/0453
CPC分类号： H04W56/0035 , H04W56/0015 , H04W72/0453
摘要： A method for determining a clock offset between local clocks of at least one pair of radio units, includes performing two-way transmissions between at least one pair of radio units using signals including selected frequencies, determining phase information regarding the signals received at the radio units, determining phase differences based on the phase information, determining at least one clock offset variable, and determining an estimated maximum error in the determined clock offset variable based on maximum errors of the phase differences to determine if the maximum error of the determined clock offset variable allows the clock offset value to be unambiguously determined.
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公开(公告)号：US20240168120A1
公开(公告)日：2024-05-23
申请号：US18199760
申请日：2023-05-19
发明人： James A. Stevens , Eric J. Loren , William B. Sorsby , Tj T. Kwon
CPC分类号： G01S5/0027 , G01S13/583 , G01S13/62 , H04W56/0015 , H04W56/0035 , H04W56/005
摘要： A system is disclosed for Doppler nulling configured for security. The system may include a receiver or transmitter node. The receiver or transmitter node may include a communications interface with an antenna element and a controller. The controller may include one or more processors and have information of own node velocity and own node orientation relative to a common reference frame. The receiver or transmitter node may be time synchronized to apply Doppler corrections to signals, the Doppler corrections associated with the receiver or transmitter node's own motions relative to the common reference frame, the Doppler corrections applied using Doppler null steering along Null directions based on a protocol. The protocol may include a protocol modulation, such as a modulation of the signals for security purposes.
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公开(公告)号：US11991658B2
公开(公告)日：2024-05-21
申请号：US17674020
申请日：2022-02-17
申请人： DeepSig Inc.
发明人： Timothy J. O'Shea , Ben Hilburn , Tamoghna Roy , Nathan West
IPC分类号： H04W56/00 , G06N3/044 , G06N3/08 , G06N3/084 , G06N20/00 , H04B17/391 , H04L5/00 , H04L41/14 , H04W16/22 , H04W72/0453
CPC分类号： H04W56/0035 , G06N3/044 , G06N3/08 , G06N3/084 , G06N20/00 , H04B17/3912 , H04L5/0005 , H04L41/145 , H04W16/22 , H04W72/0453
摘要： Methods, systems, and apparatus, including computer programs encoded on computer storage media, for training and deploying machine-learned communication over RF channels. In some implementations, information is obtained. An encoder network is used to process the information and generate a first RF signal. The first RF signal is transmitted through a first channel. A second RF signal is determined that represents the first RF signal having been altered by transmission through the first channel. Transmission of the first RF signal is simulated over a second channel implementing a machine-learning network, the second channel representing a model of the first channel. A simulated RF signal that represents the first RF signal having been altered by simulated transmission through the second channel is determined. A measure of distance between the second RF signal and the simulated RF signal is calculated. The machine-learning network is updated using the measure of distance.
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公开(公告)号：US11991657B2
公开(公告)日：2024-05-21
申请号：US17388684
申请日：2021-07-29
发明人： Mehmet Toy
IPC分类号： H04W56/00 , H04W24/04 , H04W72/0446
CPC分类号： H04W56/0035 , H04W24/04 , H04W72/0446
摘要： Methods and systems for managing data transmissions are disclosed. An example method can comprise determining a plurality of time allocations for a time cycle. The plurality of time allocations can comprise a first time allocation which can be determined based on an information rate, a committed information rate, an excess information rate, an effective bandwidth rate, other factors, or a combination thereof. Data can be received from multiple sources into a buffer, for example, and can be processed within a time cycle if processing the data will not exceed the time allocation.
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10.发明公开公开(公告)号：US20240155530A1
公开(公告)日：2024-05-09
申请号：US17980704
申请日：2022-11-04
发明人： Guner Arslan
IPC分类号： H04W56/00
CPC分类号： H04W56/0075 , H04W56/0035
摘要： A system and method to improve the accuracy of the measurement of round trip delay in a high accuracy distance measurement (HADM) is disclosed. In one embodiment, the traditional parabolic estimation is used. However, an estimation error is used to compensate for the inaccuracy of the parabolic estimation. This correction may reduce the standard deviation of a measurement by 50% or more. In another embodiment, the parabolic estimation is not used; rather, a different estimation is used, such as an absolute value estimation. In some tests, the absolute value estimation improved the mean measurement value and reduced the standard deviation by 50%.
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