IP Library › Granted Patent US 12,212,401
Granted Patent B2
US 12,212,401 · App. 18/499,728 · Granted Jan 28, 2025

Satellite for end to end beamforming

Inventors: Kenneth V. Buer (Bluff City, TN); Mark J. Miller (San Marcos, CA)
Assignee: ViaSat, Inc.
H04B7/18513H01Q1/06H01Q1/288H01Q3/247H01Q3/40H01Q5/50H01Q19/132H01Q21/0025H01Q21/24H01Q25/001H04B7/024H04B7/0413H04B7/0617H04B7/18508H04B7/18515H04B7/18517H04B7/18534H04B7/1858H04B7/18586H04B7/18589H04B7/204H04B7/2041H04B10/118H04W4/00H04W16/28H04W40/20H04W76/10H04W84/06H01Q1/247H04W16/26
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Quick Facts
Patent No.
US 12,212,401
App. No.
18/499,728
Granted
Jan 28, 2025
Kind
B2
Abstract

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

Claims (24)

1. A satellite for providing communications between a plurality of access nodes (ANs) and a plurality of user terminals, the plurality of ANs geographically distributed over an AN coverage area and the plurality of user terminals geographically distributed over a user coverage area, the satellite comprising:

a feeder-link antenna subsystem configured to illuminate the AN coverage area and comprising an array of feeder-link receive elements where adjacent ones in the array of feeder-link receive elements have overlapping receive antenna patterns, and further comprising an array of feeder-link transmit elements where adjacent ones in the array of feeder-link transmit elements have overlapping transmit antenna patterns;

a user-link antenna subsystem configured to illuminate the user coverage area and comprising an array of user-link receive elements where adjacent ones in the array of user-link receive elements have overlapping receive antenna patterns, and further comprising an array of user-link transmit elements where adjacent ones in the array of user-link transmit elements have overlapping transmit antenna patterns;

a plurality of forward-link transponders, each comprising a bent-pipe signal path having a receive side coupled to a corresponding one of the feeder-link receive elements in the array of feeder-link receive elements, and having a transmit side coupled to a corresponding one of the user-link transmit elements in the array of user-link transmit elements; and

a plurality of return-link transponders, each comprising a bent-pipe signal path having a receive side coupled to a corresponding one of the user-link receive elements in the array of user-link receive elements, and having a transmit side coupled to a corresponding one of the feeder-link transmit elements in the array of feeder-link transmit elements.

2. The satellite according to claim 1 , wherein the feeder-link antenna subsystem comprises an array-fed reflector antenna and wherein the overlapping receive patterns of the feeder-link receive elements and the overlapping transmit patterns of the feeder-link transmit elements are a function of the arrays of feeder-link receive elements and feeder-link transmit elements being defocused arrays, based on being located outside a focal plane of a reflector comprised in the array-fed reflector antenna.

3. The satellite according to claim 1 , wherein the user-link antenna subsystem comprises an array-fed reflector antenna and wherein the overlapping receive patterns of the user-link receive elements and the overlapping transmit patterns of the user-link transmit elements are a function of the arrays of user-link receive elements and user-link transmit elements being defocused arrays, based on being located outside a focal plane of a reflector comprised in the array-fed reflector antenna.

4. The satellite according to claim 1 , wherein the bent-pipe signal path of each forward-link transponder includes a frequency converter, for converting from a feeder uplink frequency to a user downlink frequency.

5. The satellite according to claim 1 , wherein the bent-pipe signal path of each return-link transponder includes a frequency converter, for converting from a user uplink frequency to a feeder downlink frequency.

6. The satellite according to claim 1 , wherein the receive side of the bent-pipe signal path of each forward-link transponder is configured for reception in a first frequency band and the transmit side is configured for transmission in a second frequency band, and wherein the receive side of the bent-pipe signal path of each return-link transponder is configured for reception in the second frequency band and the transmit side is configured for transmission in the first frequency band.

7. The satellite according to claim 1 , wherein the forward-link transponders and the return-link transponders are configured for signal reception in a same first frequency range, and further are configured for signal transmission in a same second frequency range.

8. The satellite according to claim 7 , wherein the first frequency range is 30 GHz and the second frequency range is 20 GHz.

9. The satellite according claim 1 , wherein the number of forward-link transponders is greater than 100.

10. The satellite according to claim 1 , wherein the number of forward-link transponders is greater than 400.

11. The satellite according to claim 1 , wherein the number of forward-link transponders is a function of the number of forward-link user beams to be formed using the satellite for forward-link end-to-end beamforming, and wherein the number of return-link transponders is a function of the number of return-link user beams to be formed using the satellite for return-link end-to-end beamforming.

12. The satellite according to claim 1 , wherein the forward-link transponders and the return-link transponders comprise one set of transponders configured for selective operation either in a forward-link direction or in a return-link direction.

13. The satellite according to claim 12 , wherein the satellite includes respective sets of electrical switches operative to control whether the set of transponders operates in a first connectivity configuration used for forward-link operation or a second connectivity configuration used for return-link operation.

14. The satellite according to claim 1 , wherein the overlapping antenna patterns of the feeder-link receive elements are configured to induce multi-path between respective ANs and user terminals, based on corresponding extents of overlap being such that a forward uplink signal from any AN in the AN coverage area is retransmitted via at least two of the forward-link transponders, and the overlapping antenna patterns of the user-link receive elements are configured to induce multi-path between respective user terminals and ANs, based on corresponding extents of overlap being such that a return uplink signal from any user terminal in the user coverage area is retransmitted via at least two of the return-link transponders.

15. The satellite according to claim 1 , wherein, for end-to-end beamforming in a forward link direction, each AN transmits a respective one among a plurality of beamweighted forward uplink signals, and wherein the overlapping antenna patterns of the feeder-link receive elements are configured such that each feeder-link receive element receives a composite forward uplink signal comprising a unique superposition of two or more of the beamweighted forward uplink signals, with each forward-link transponder retransmitting the received composite forward uplink signal as a corresponding forward downlink signal.

16. The satellite according to claim 15 , wherein, further for end-to-end beamforming in the forward link direction, the overlapping antenna patterns of the user-link transmit elements are configured such that each user terminal receives a unique superposition of two or more of the forward downlink signals.

17. The satellite according to claim 1 , wherein, for end-to-end beamforming in a return link direction, each user terminal transmits a respective return uplink signal, and wherein the overlapping antenna patterns of the user-link receive elements are configured such that each user-link receive element receives a composite return uplink signal comprising a unique superposition of return uplink signals from two or more user terminals, with each return-link transponder retransmitting the received composite return uplink signal as a corresponding return downlink signal.

18. The satellite according to claim 17 , wherein, further for end-to-end beamforming in the return link direction, the overlapping antenna patterns of the feeder-link transmit elements are configured such that each AN receives a unique superposition of two or more of the return downlink signals.

19. The satellite according to claim 1 , wherein the overlapping antenna patterns of the feeder-link receive elements are configured to induce multipath relaying of a forward uplink signal from any AN in the AN coverage area into the user coverage area, and the overlapping antenna patterns of the user-link receive elements are configured to induce multipath relaying of a return uplink signal from any user terminal in the user coverage area into the AN coverage area.

20. The satellite according to claim 1 , wherein the receive side of each forward-link transponder is electrically connected to the corresponding one of the feeder-link receive elements, the transmit side of each forward-link transponder is electrically connected to the corresponding one of the user-link transmit elements, and wherein the receive side of each return-link transponder is electrically connected to the corresponding one of the user-link receive elements, and the transmit side of each return-link transponder is electrically connected to the corresponding one of the feeder-link transmit elements.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 1, 2023
From: BUER, KENNETH V.; MILLER, MARK J.
To: VIASAT, INC.
Reel/Frame 065427/0048 →
Continuity (16)
Continuation 17375704 · Jul 14, 2021
Division 16811556 · Mar 6, 2020
Continuation 16390279 · Apr 22, 2019
Continuation 16044911 · Jul 25, 2018
Continuation 15719186 · Sep 28, 2017
Continuation PCTUS2017013518 · Jan 13, 2017
Continuation PCTUS2016026815 · Apr 8, 2016
Continuation PCTUS2016026813 · Apr 8, 2016
Provisional Application 62314921 · Mar 29, 2016
Provisional Application 62312342 · Mar 23, 2016
Provisional Application 62298911 · Feb 23, 2016
Provisional Application 62278368 · Jan 13, 2016
Provisional Application 62164456 · May 20, 2015
Provisional Application 62145804 · Apr 10, 2015
Provisional Application 62145810 · Apr 10, 2015
Related Publication 20240259086A1 · Aug 1, 2024
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