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公开(公告)号：US20190036591A1
公开(公告)日：2019-01-31
申请号：US16147630
申请日：2018-09-29
Applicant: Facebook, Inc.
Inventor： Sanjai Kohli , Djordje Tujkovic , Krishna Gomadam
CPC classification number: H04B7/088 , H04B7/063 , H04B7/0695
Abstract: A procedure to establish a link in a directional wireless system where two nodes cannot listen to each other unless optimized beamforming pair is used and timing and framing synchronization is acquired. The procedure determines a set of beamforming pairs that the nodes can use for communication in addition to acquiring the framing and timing synchronization. Training packets are periodically transmitted by a transmitter while a receiver listens in each of a number of receive directions. Training packets are sent N times in N directions while a receiver listens in each of M receive directions until all N×M possible transmit and receive direction pair possibilities are tried. The receiver informs the transmitter which transmit and receive direction pairs were successful in creating communication links between the nodes.
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公开(公告)号：US10177870B2
公开(公告)日：2019-01-08
申请号：US15248378
申请日：2016-08-26
Applicant: Facebook, Inc.
Inventor： Vish Ponnampalam , Krishna Gomadam , Djordje Tujkovic
Abstract: Apparatuses, methods, and systems of assigning codes are disclosed. One method includes selecting a plurality of available codes, grouping links of a wireless network into a plurality of groups based on connectivity of the links between sectors of the wireless network, characterizing interference between at least one link of a first group of the plurality of groups and at least one link of a second group of the plurality of groups, and assigning at least one code of the plurality of available codes to the first group and at least one other code of the plurality of available codes to the second group based on the characterizing of the interference.
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公开(公告)号：US10148557B2
公开(公告)日：2018-12-04
申请号：US15382682
申请日：2016-12-18
Applicant: Facebook, Inc.
Inventor： Krishna Gomadam , Djordje Tujkovic , Sanjai Kohli
IPC: H04B7/00 , H04L12/721 , H04L12/24 , H04L12/26
Abstract: A wireless communication network includes a transmitting node and a receiving node configured to transmit and receive packets between the transmitting node and the receiving node through one or more of a plurality of predetermined micro-routes is disclosed. For an embodiment, the transmitting node is configured to retrieve a first micro-route, transmit packets in a first transmit beamforming direction associated with the first micro-route, transmit packets including one or more training signals in a second transmit beamforming direction associated with a second micro-route of the plurality of predetermined micro-routes that is different than the first transmit beamforming direction associated with the first micro-route, and receive feedback from the receiving node indicating that the second micro-route provides a better communication link than the first micro-route.
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公开(公告)号：US09948408B1
公开(公告)日：2018-04-17
申请号：US15584130
申请日：2017-05-02
Applicant: Facebook, Inc.
Inventor： Krishna Srikanth Gomadam , William Charles Fujimoto , Djordje Tujkovic , Sanjai Kohli
Abstract: Apparatuses, methods, and systems for calibrating an antenna array are disclosed. One method includes selecting an antenna element of a first antenna subarray and an antenna element of a second antenna subarray, transmitting the signal through the at least one antenna element of the first subarray having a first selected phase, transmitting the signal through the at least one antenna element of the second subarray having a second selected phase, and characterizing a relative phase offset between the antenna element of the first antenna subarray and the antenna element of the second antenna subarray, including adjusting the first selected phase or the second selected phase, and monitoring a receive signal received at a calibration antenna that includes the transmitted signal of the at least one antenna element of the first antenna subarray and the transmitted signal of the at least one antenna element of second antenna subarray.
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公开(公告)号：US20180007718A1
公开(公告)日：2018-01-04
申请号：US15196340
申请日：2016-06-29
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic , Krishna Gomadam , Sanjai Kohli
CPC classification number: H04W76/10 , H04B7/0617
Abstract: Apparatuses, methods, and systems of a node that supports a simultaneous bidirectional wireless link with a second node are disclosed. One embodiment of the node includes a first sector that includes a first transceiver and a first plurality of antennas operative to form a beam directed to a first sector of a second node. The node further includes a second sector that includes a second transceiver and a second plurality of antennas operative to form a beam directed to a second sector of the second node. For at least one time slot of a plurality of time slots, one of the first transceiver or the second transceiver is operative to transmit a first communication signal to the second node while the other of the first transceiver or the second transceiver is operative to receive a second communication signal from the second node.
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Patent Agency Ranking
公开(公告)号：US09788292B2
公开(公告)日：2017-10-10
申请号：US15406675
申请日：2017-01-14
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
CPC classification number: H04W56/003 , H04B7/0413 , H04B7/0617 , H04B17/11 , H04B17/14 , H04B17/30 , H04B17/3911 , H04L5/0023 , H04L5/0048 , H04L5/005 , H04W4/20
Abstract: Systems and associated methods for reciprocity calibration of MIMO wireless communication are disclosed. In one embodiment, a method includes receiving, by a base station, a first set of pilot symbols by receivers (RXes) of the base station based on a first pilot symbol transmitted from a transmitter (TX) of at least one reference antenna, transmitting, by the base station, a second pilot symbol by TXes of the base station, wherein the transmitted second pilot symbol is received by an RX of the at least one reference antenna as a second set of r0,i pilot symbols calculating non-reciprocity compensation factors based on the first set of pilot symbols and the second set of pilot symbols.
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公开(公告)号：US09787382B2
公开(公告)日：2017-10-10
申请号：US15478561
申请日：2017-04-04
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic , Krishna Gomadam
CPC classification number: H04B7/0617 , H01Q1/2291 , H01Q3/34
Abstract: A system for transmitting information between nodes in a point-to-point wireless communication system. The system includes a node with an antenna array and a beamformer that is controllable to orient a main lobe of the antenna array in a desired direction. A spacing of the plurality of antenna elements in the array is adjustable to control a direction of a grating lobe of the antenna array to complete a communication link with a node in the network. Signals are simultaneously transmitted in the direction of the main lobe and the grating lobe to different nodes in the network.
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公开(公告)号：US20170207840A1
公开(公告)日：2017-07-20
申请号：US15478561
申请日：2017-04-04
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
CPC classification number: H04B7/0617 , H01Q1/2291 , H01Q3/34
Abstract: A system for transmitting information between nodes in a point-to-point wireless communication system. The system includes a node with an antenna array and a beamformer that is controllable to orient a main lobe of the antenna array in a desired direction. A spacing of the plurality of antenna elements in the array is adjustable to control a direction of a grating lobe of the antenna array to complete a communication link with a node in the network. Signals are simultaneously transmitted in the direction of the main lobe and the grating lobe to different nodes in the network.
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公开(公告)号：US20170195916A1
公开(公告)日：2017-07-06
申请号：US15382685
申请日：2016-12-18
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic , Krishna Gomadam , Vish Ponnampalam
CPC classification number: H04W76/14 , H04K3/825 , H04L27/2692 , H04L2025/03789 , H04L2025/03796 , H04W28/04
Abstract: Methods, apparatuses, and systems for transmitting information between nodes in a point-to-point wireless communication network is disclosed. One method includes constructing, by a sector of a transmitting node, a packet including data that is to be transmitted to a receiving node in the wireless network, wherein the constructed packet includes a short training field, a channel estimation field, a header field, and a data payload, and transmitting by the sector of the transmitting node, a jamming code before the short training field of the constructed packet, thereby reducing a likelihood that the receiving node will decode a different short training field of an interfering packet before the receiving node decodes the short training field of the constructed packet.
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公开(公告)号：US10736015B1
公开(公告)日：2020-08-04
申请号：US16384727
申请日：2019-04-15
Applicant: Facebook, Inc.
Inventor： Djordje Tujkovic
Abstract: In one embodiment, a controller of a multi-hop wireless network may access an interference map indicating interference among network nodes, each network node comprising sectors that each comprise an array of beamforming antennae. The controller may identify desired links between network nodes, each desired link being associated with a transmitting (TX) beamforming weight variable and a receiving (RX) beamforming weight variable. The controller may generate a factor-graph representation of the multi-hop wireless network comprising a first and second set of vertices, wherein the first set of vertices are variable nodes representing pairs of beamforming weight variables associated with identified desired links, and the second set of vertices are function nodes representing capacity equations associated with identified desired links. The controller may determine adjustments for beamforming weights of the identified desired links to reduce interference among the network nodes by applying a belief-propagation algorithm to a portion of the factor-graph representation.
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