[미국특허]
Access node farm for end-to-end beamforming
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-010/00
H04B-007/185
H04W-016/28
H04B-010/118
출원번호
US-0719249
(2017-09-28)
등록번호
US-10084532
(2018-09-25)
발명자
/ 주소
Buer, Kenneth V.
Miller, Mark J.
Cronin, Christopher J.
출원인 / 주소
VIASAT, INC.
대리인 / 주소
Kilpatrick Townsend & Stockton LLP
인용정보
피인용 횟수 :
4인용 특허 :
46
초록▼
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
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.
대표청구항▼
1. A system for providing a communication service to user terminals geographically distributed over a user coverage area comprising multiple forward user beam coverage areas via an end-to-end relay comprising multiple forward receive/transmit signal paths, comprising: a plurality of access nodes geo
1. A system for providing a communication service to user terminals geographically distributed over a user coverage area comprising multiple forward user beam coverage areas via an end-to-end relay comprising multiple forward receive/transmit signal paths, comprising: a plurality of access nodes geographically distributed within an access node area having a physical area that is smaller than a physical area of the user coverage area, the plurality of access nodes transmitting respective access node-specific forward signals to the end-to-end relay, each of the respective access node-specific forward signals comprising a composite of respective forward beam signals weighted by respective forward beamforming weights of a forward beam weight matrix for end-to-end beamforming of transmissions from the plurality of access nodes to the multiple forward user beam coverage areas via the end-to-end relay, each access node of the plurality of access nodes comprising: a network interface that obtains one of the respective access node-specific forward signals;a transmitter that transmits a forward uplink signal comprising the one of the respective access node-specific forward signals to the end-to-end relay;a controller that pre-corrects the forward uplink signal to compensate for a path delay and a phase shift introduced between the access node and the end-to-end relay;a receiver that receives a return downlink signal from the end-to-end relay, the return downlink signal comprising a relay beacon signal and return uplink signals from a plurality of the user terminals relayed by the end-to-end relay, to form a composite return signal;a relay beacon signal demodulator that demodulates the relay beacon signal to obtain relay timing information; anda multiplexer that multiplexes the composite return signal with the relay timing information to obtain a multiplexed composite return signal,wherein the network interface sends the multiplexed composite return signal to a return beamformer. 2. The system of claim 1, wherein the access node area at least partially overlaps with a low demand area of the user coverage area. 3. The system of claim 2, wherein the low demand area of the user coverage area comprises an area in which the demand for the communication service is below a demand threshold. 4. The system of claim 1, further comprising a distribution network that distributes the plurality of access node-specific forward signals. 5. The system of claim 1, wherein the access node area is contained within the user coverage area. 6. The system of claim 1, wherein the physical area of the access node area is less than one half of the physical area of the user coverage area. 7. The system of claim 1, wherein the physical area of the access node area is less than one-fifth of the physical area of the user coverage area. 8. The system of claim 1, wherein the physical area of the access node area is less than one-tenth of the physical area of the user coverage area. 9. The system of claim 1, wherein the access node area is a single contiguous coverage area. 10. A system for providing a communication service to user terminals geographically distributed over a user coverage area via an end-to-end relay comprising multiple forward receive/transmit signal paths, comprising: a forward beamformer that obtains multiple forward beam signals comprising forward user data streams for transmission to the user terminals grouped by multiple forward user beam coverage areas and generates a plurality of access-node specific forward signals based on a matrix product of a forward beam weight matrix for end-to-end beamforming of transmissions from an access node area that is at least partially overlapping with an aquatic body to the multiple forward user beam coverage areas via the end-to-end relay and a vector of the forward beam signals;a plurality of access nodes geographically distributed within the access node area, wherein each of the plurality of access nodes obtains a respective one of the plurality of access node-specific forward signals, and wherein each of the plurality of access nodes comprises a transmitter that transmits a respective forward uplink signal to the end-to-end relay based on the respective access node-specific forward signal, and wherein the respective forward uplink signals are pre-corrected to compensate for respective path delays and phase shifts introduced between the plurality of access nodes and the end-to-end relay, and wherein at least one of the plurality of access nodes is located within the aquatic body; anda beam weight generator that generates the forward beam weight matrix as a first forward beam weight matrix for end-to-end beamforming of transmissions from the plurality of access nodes disposed at first locations within the access node area, and generates the forward beam weight matrix as a second forward beam weight matrix for end-to-end beamforming of transmissions from the plurality of access nodes disposed at second locations within the access node area in response to a change in location of at least one of the plurality of access nodes. 11. The system of claim 10, wherein the at least one of the plurality of access nodes is located on a floating platform in the aquatic body. 12. The system of claim 10, further comprising a distribution network that distributes the plurality of access node-specific forward signals. 13. The system of claim 12, wherein the distribution network comprises a submarine cable coupled with the forward beamformer and the at least one of the plurality of access nodes. 14. The system of claim 12, wherein the distribution network comprises a free space optical link that couples the forward beamformer and the at least one of the plurality of access nodes. 15. The system of claim 12, wherein the forward beamformer or the distribution network are located within the aquatic body. 16. The system of claim 10, wherein the aquatic body comprises an ocean. 17. The system of claim 10, wherein the user coverage area comprises a terrestrial land mass. 18. The system of claim 10, wherein the access node area is at least partially overlapping with the user coverage area. 19. A system for providing a communication service to user terminals geographically distributed over a user coverage area comprising multiple forward user beam coverage areas via an end-to-end relay comprising multiple forward receive/transmit signal paths, comprising: a plurality of access nodes disposed on respective mobile platforms within a first access node area having a physical area that is smaller than a physical area of the user coverage area, the plurality of access nodes transmitting respective access node-specific forward signals to the end-to-end relay, each of the respective access node-specific forward signals comprising a composite of respective forward beam signals weighted by respective forward beamforming weights of a first forward beam weight matrix for end-to-end beamforming of transmissions from the plurality of access nodes disposed at first locations within the first access node area to the multiple forward user beam coverage areas via the end-to-end relay, each access node of the plurality of access nodes comprising: a network interface that obtains one of the respective access node-specific forward signals;a transmitter that transmits a forward uplink signal comprising the one of the respective access node-specific forward signals to the end-to-end relay; anda controller that pre-corrects the forward uplink signal to compensate for a path delay and a phase shift introduced between the access node and the end-to-end relay;a beam signal interface that obtains multiple forward beam signals comprising forward user data streams for transmission to the user terminals grouped by multiple forward user beam coverage areas;a beam weight generator that generates the first forward beam weight matrix for end-to-end beamforming from the first locations within the first access node area to the multiple forward user beam coverage areas via the end-to-end relay; anda beamformer coupled with the beam signal interface and the beam weight generator, the beamformer comprising a forward matrix multiplier that obtains the respective access-node specific forward signals based on a matrix product of the first forward beam weight matrix and a vector of the forward beam signals,wherein the beam weight generator generates a second forward beam weight matrix for end-to-end beamforming from second locations of the plurality of access nodes within the first access node area in response to a change in location of at least one of the plurality of access nodes. 20. The system of claim 19, wherein: at least a subset of the plurality of access nodes change locations such that locations of the plurality of access nodes define a second access node area that is different than the first access node area. 21. The system of claim 20, wherein the change in location of the at least the subset of the plurality of access nodes is in response to a change in location of the end-to-end relay. 22. The system of claim 19, wherein the beamformer is disposed on a mobile processing platform located proximate to the first access node area. 23. The system of claim 19, further comprising: a distribution network that distributes the plurality of access node-specific forward signals to the plurality of access nodes on the respective mobile platforms. 24. A method of communication at an access node of a communication system comprising a plurality of access nodes at geographically distributed locations providing a communication service to user terminals geographically distributed over multiple forward user beam coverage areas via an end-to-end relay comprising multiple forward receive/transmit signal paths, the method comprising: obtaining, while the access node is at a first location, a first access node-specific forward signal for transmission via the end-to-end relay to a plurality of the user terminals grouped by the multiple forward user beam coverage areas, the first access node-specific forward signal comprising a composite of first forward beam signals corresponding to a plurality of the multiple forward user beam coverage areas, the first forward beam signals weighted by respective beam weights of a first beam weight vector associated with the first location;synchronizing a first forward uplink signal for reception at the end-to-end relay time and phase aligned with a first group of other forward uplink signals from other access nodes of the plurality of access nodes;transmitting the first forward uplink signal comprising the first access node-specific forward signal to the end-to-end relay;changing from the first location to a second location;obtaining, while the access node is at the second location, a second access node-specific forward signal for transmission via the end-to-end relay to the plurality of the user terminals grouped by the multiple forward user beam coverage areas, the second access node-specific forward signal comprising a composite of second forward beam signals corresponding to the plurality of the multiple forward user beam coverage areas, the second forward beam signals weighted by respective beam weights of a second beam weight vector associated with the second location;synchronizing a second forward uplink signal for reception at the end-to-end relay time and phase aligned with a second group of other forward uplink signals from the other access nodes of the plurality of access nodes; andtransmitting the second forward uplink signal comprising the second access node-specific forward signal to the end-to-end relay. 25. The method of claim 24, wherein the synchronizing comprises: identifying forward uplink signal transmit timing information indicating transmission timing in the respective access node-specific forward signal;transmitting an access node beacon signal to the end-to-end relay;receiving signaling from the end-to-end relay comprising a loopback beacon signal; andadjusting the forward uplink signal transmit timing information to time and phase align the respective forward uplink signal with the respective group of other forward uplink signals. 26. The method of claim 24, wherein the changing from the first location to the second location is in response to a change in location of the end-to-end relay. 27. The method of claim 24, wherein first and second access node-specific forward signals are obtained from a forward beamformer via a free space optical link.
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