公开(公告)号：US20240349270A1

公开(公告)日：2024-10-17

申请号：US18430384

申请日：2024-02-01

Applicant: Space Exploration Technologies Corp.

Inventor： Peter J. Worters ,  Martin S. McCormick ,  Andrew G. Whitlow

IPC: H04W72/121 ,  H04B7/185 ,  H04L5/16 ,  H04W56/00 ,  H04W72/1273

CPC classification number: H04W72/121 ,  H04B7/18513 ,  H04L5/16 ,  H04W56/0045 ,  H04W56/0055 ,  H04W72/1273

Abstract: Systems, methods, and non-transitory media are provided for timing transmissions in a wireless communication system. An example method can include determining, at a satellite, a maximum round-trip propagation delay associated with one or more user terminals of a plurality of user terminals, determining, based on the maximum round-trip propagation delay, a respective downlink to uplink (DL/UL) offset for each user terminal, wherein the DL/UL offset comprises a time difference between a first downlink frame at the satellite and a first corresponding uplink frame at the satellite, transmitting a first downlink frame, receiving a first uplink frame from a first user terminal associated with the maximum round-trip propagation delay during the first corresponding uplink frame at the satellite, and receiving a second uplink frame from a second user terminal associated with a round-trip propagation delay less than the maximum round-trip propagation delay during the first corresponding uplink frame at the satellite.

公开(公告)号：US11985611B1

公开(公告)日：2024-05-14

申请号：US17339890

申请日：2021-06-04

Applicant: Space Exploration Technologies Corp.

Inventor： Peter J. Worters ,  Martin S. McCormick ,  Matthew J. Monson

IPC: H04W56/00 ,  H04L5/00 ,  H04W4/02 ,  H04W84/06

CPC classification number: H04W56/0005 ,  H04W56/0045 ,  H04W56/0055 ,  H04W56/006 ,  H04W84/06 ,  H04L5/0007 ,  H04W4/027

Abstract: Systems, methods, and non-transitory media are provided for synchronization of multi-user uplink transmissions. An example method can include receiving, by a user terminal, a downlink radio frame transmitted by a satellite; determining, by the user terminal, a downlink propagation delay associated with the downlink radio frame and an uplink propagation delay associated with an uplink radio frame from the user terminal to the satellite; based on the downlink propagation delay and the uplink propagation delay, determining, by the user terminal, an uplink transmission delay indicating an amount of time to delay a transmission of the uplink radio frame to the satellite so the uplink radio frame is received at the satellite at a same target time as one or more additional uplink radio frames from one or more additional user terminals; and transmitting, by the user terminal, the uplink radio frame at a time corresponding to the uplink transmission delay.

公开(公告)号：US11283666B1

公开(公告)日：2022-03-22

申请号：US17185501

申请日：2021-02-25

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick ,  Feipeng Wang

IPC: H03F1/32 ,  H04L27/36 ,  H04B1/04

Abstract: A wireless communications system includes a stochastic pre-distortion actuator configured to receive a carrier-modulated signal and convert the carrier-modulated signal into an output signal. The system includes one or more antennas configured to receive the output signal and transmit the output signal, one or more power amplifiers electrically coupled between the pre-distortion actuator and the one or more antennas and a receiver configured to receive the output signal over-the-air and generate feedback based on the output signal. The pre-distortion actuator is configured to generate the output signal by applying a correction to the carrier-modulated signal that cancels out nonlinearities associated with the one or more antennas and/or the one or more power amplifiers. The pre-distortion actuator is configured based on the feedback.

公开(公告)号：US20250062935A1

公开(公告)日：2025-02-20

申请号：US18815754

申请日：2024-08-26

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick ,  Torbjorn Larsson ,  Alazar Tamrat ,  Jeffrey C. Strait ,  Chen Chen ,  Philip J. Treigherman ,  Stephan O. Roche ,  Ronald Gottula

IPC: H04L25/02 ,  H04B7/185 ,  H04L5/00 ,  H04L27/00 ,  H04L27/26 ,  H04W72/044 ,  H04W72/0453

Abstract: A modem is configured to receive a transmitted waveform transmitted from a satellite (SAT) to a user terminal (UT). The modem includes: a receiver, on the UT, configured to receive the transmitted waveform from the SAT, the transmitted waveform comprising first resource blocks intended for the UT and second resource blocks intended for a second UT, a first set of components configured with the receiver on the UT to process the transmitted waveform with the first resource blocks and the second resource blocks, a multi-user demapper configured with the receiver to extract the first resource blocks from the transmitted waveform to yield a per-user signal, and a second set of components configured within the receiver to demodulate and decode the first resource blocks in the per-user signal.

公开(公告)号：US20250048128A1

公开(公告)日：2025-02-06

申请号：US18805387

申请日：2024-08-14

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick

IPC: H04W16/28 ,  G01S3/56 ,  H04B7/06 ,  H04W84/06

Abstract: In an embodiment, an apparatus includes an antenna assembly configured to transmit and receive beams in time-varying directions, and a beam steering controller configured to determine a first beam pointing vector by searching for a satellite included in the communication system. The antenna assembly maintains a communication link with the satellite in a direction associated with the beam pointing vector, the satellite associated with the beam pointing vector. The beam steering controller is configured to obtain, from the satellite, satellite ephemeris information of the satellite and one or more additional satellites. The beam steering controller is configured to determine an orientation of the antenna assembly based on the satellite ephemeris information and the beam pointing vector.

公开(公告)号：US11881914B1

公开(公告)日：2024-01-23

申请号：US17333818

申请日：2021-05-28

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick

IPC: H04W16/28 ,  H04B7/185 ,  H04B7/0426 ,  H04B17/318 ,  H04B7/06

CPC classification number: H04B7/043 ,  H04B7/0617 ,  H04B7/18513 ,  H04B17/318 ,  H04W16/28

Abstract: In an embodiment, an apparatus includes an antenna assembly, a modem, and a beam steering controller. A beam steering controller is configured to determine a beam pointing direction of the antenna assembly to be able to one or both of switch a first communication link with a first satellite to a second communication link with a second satellite or establish and maintain the first communication link with the first satellite. At a start of a determination of the beam pointing direction, one or more of an orientation of the antenna assembly is unknown, positions of a plurality of satellites are unknown, or downlink frequencies of the plurality of satellites are unknown.

公开(公告)号：US11671162B1

公开(公告)日：2023-06-06

申请号：US17230659

申请日：2021-04-14

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick

IPC: H04B7/08 ,  H04L5/14 ,  H04B7/00 ,  H04B1/12

CPC classification number: H04B7/0845 ,  H04B1/126 ,  H04B7/002 ,  H04L5/14

Abstract: In an embodiment, a cross-polarization interference compensation module is included in a receiver of a wireless communication system. The module includes first and second input lines configured to receive respective first and second down-converted digital polarized signals based on receipt of a wireless transmission. The module further includes first and second output lines electrically coupled to at least one modem. The module further includes a first complex finite impulse response (FIR) filter configured to receive the second down-converted digital polarized signal and generate a correction factor that cancels cross-polarization components in the first down-converted digital polarized signal. The module further includes a first filter coefficient engine in communication with the first complex FIR filter and configured to adapt the first complex FIR filter over time based on the first and second down-converted digital polarized signals.

公开(公告)号：US11671123B1

公开(公告)日：2023-06-06

申请号：US17185427

申请日：2021-02-25

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick ,  Feipeng Wang

IPC: H04B1/04 ,  H03F1/32 ,  H04L27/36

CPC classification number: H04B1/04 ,  H03F1/3247 ,  H04L27/368 ,  H03F2201/3233 ,  H04B2001/0425 ,  H04B2001/0433

Abstract: A wireless communications system includes a pre-distortion actuator configured to receive a carrier-modulated signal and convert the carrier-modulated signal into an output signal. The system includes one or more antennas configured to receive the output signal and transmit the output signal, one or more power amplifiers electrically coupled between the pre-distortion actuator and the one or more antennas and a receiver configured to receive the output signal over-the-air and generate feedback based on the output signal. The pre-distortion actuator is configured to generate the output signal by applying a correction to the carrier-modulated signal that cancels out nonlinearities associated with the one or more antennas and/or the one or more power amplifiers. The pre-distortion actuator is configured based on the feedback.

公开(公告)号：US12191941B2

公开(公告)日：2025-01-07

申请号：US18537420

申请日：2023-12-12

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick

IPC: H04B7/0426 ,  H04B7/06 ,  H04B7/185 ,  H04B17/318 ,  H04W16/28

Abstract: In an embodiment, a method includes determining a first beam pointing vector associated with an antenna assembly by searching for a satellite from a plurality of satellites. The method includes maintaining a communication link with the satellite by determining a plurality of beam pointing vectors that converge to a signal quality value. The method includes obtaining, from the satellite, satellite ephemeris information of the satellite and one or more of remaining satellites of the plurality of satellites. The method includes determining an estimated orientation of the antenna assembly based on one or more of the satellite ephemeris information and the plurality of beam pointing vector. The method includes determining a second beam pointing vector based on the estimated orientation, the satellite ephemeris information, and an approximate position information of the antenna assembly.

公开(公告)号：US11665043B2

公开(公告)日：2023-05-30

申请号：US17671077

申请日：2022-02-14

Applicant: Space Exploration Technologies Corp.

Inventor： Martin S. McCormick ,  Feipeng Wang

IPC: H04L27/36 ,  H03F1/32 ,  H04B1/04

CPC classification number: H04L27/367 ,  H03F1/3247 ,  H04B1/04 ,  H03F1/3258 ,  H03F1/3294 ,  H04B2001/0425

Abstract: A wireless communications system includes a pre-distortion actuator configured to receive a carrier-modulated signal and convert the carrier-modulated signal into an output signal. The system includes one or more antennas configured to receive the output signal and transmit the output signal, one or more power amplifiers electrically coupled between the pre-distortion actuator and the one or more antennas and a receiver configured to receive the output signal over-the-air and generate feedback based on the output signal. The pre-distortion actuator is configured to generate the output signal by applying a correction to the carrier-modulated signal that cancels out nonlinearities associated with the one or more antennas and/or the one or more power amplifiers. The pre-distortion actuator is configured based on the feedback.