公开(公告)号：US10136404B2

公开(公告)日：2018-11-20

申请号：US15696339

申请日：2017-09-06

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic

IPC: H04B7/06 ,  H04W56/00 ,  H04B7/0413 ,  H04L5/00 ,  H04B17/30 ,  H04B17/11 ,  H04B17/14 ,  H04B17/391 ,  H04W4/20

Abstract: Systems and associated methods for reciprocity calibration of multiple-input multiple-output (MIMO) wireless communication are disclosed herein. In one embodiment, a method for reciprocity calibration of the MIMO system includes transmitting a pilot symbol by a transmitter (TX) of the reference antenna and receiving the pilot symbol by receivers (RXes) of antennas of a base station as ri,0 pilot symbols. (Index “i” denotes individual antenna “i” of the base station, and “0” denotes the reference antenna.) The method further includes transmitting the received pilot symbols by TXes of the antennas of the base station, receiving the pilot symbols transmitted by the antennas of the base station by the reference antenna as r0,i pilot symbols, and calculating non-reciprocity compensation factors as r i , 0 r 0 , i .

公开(公告)号：US10110494B2

公开(公告)日：2018-10-23

申请号：US15255355

申请日：2016-09-02

Applicant: Facebook, Inc.

Inventor： Nabeel Ahmed ,  Djordje Tujkovic

IPC: H04L12/803 ,  H04L12/801 ,  H04W28/02 ,  H04W72/04 ,  H04W88/12

Abstract: Apparatuses, methods, and systems for allocating capacity for links of a multi-hop distributed network are disclosed. One method includes allocating capacity, by a central controller, for each link of a plurality of links of a sector of a wireless network based at least in part on a number of devices directly or indirectly wirelessly connected to the sector, providing the allocated capacity for each link to the sector, and adjusting, by the sector, the allocated capacity for at least one link of the plurality of links of the sector.

公开(公告)号：US20180006686A1

公开(公告)日：2018-01-04

申请号：US15696278

申请日：2017-09-06

Applicant: Facebook, Inc.

Inventor： Sanjai Kohli ,  Djordje Tujkovic ,  Krishna Gomadam

IPC: H04B7/0408 ,  H04B1/10 ,  H04W8/00 ,  H04W24/02 ,  H04W88/10

CPC classification number: H04B7/0408 ,  H04B1/1027 ,  H04B1/1036 ,  H04B7/0617 ,  H04W8/005 ,  H04W24/02 ,  H04W88/10

Abstract: Apparatuses, methods, and systems of a hybrid node are disclosed. One embodiment of the hybrid node includes a first sector and a second sector. The first sector is operative to transmit a signal through a predetermined transmission channel at each of a first plurality of transmit beam forming settings. The second sector is operative to receive the signal through the predetermined channel at a second plurality of receive beam forming settings for each of more than one of the first plurality of transmit beam forming settings. Further, the node is operative to measure a received signal quality of the received signal at each of the second plurality of receive beam forming settings of the second plurality of antenna elements, for each of the more than one of the first plurality of transmit beam forming settings of the first plurality of antenna elements.

公开(公告)号：US20170195909A1

公开(公告)日：2017-07-06

申请号：US15392910

申请日：2016-12-28

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic

IPC: H04W28/02 ,  H04W52/28 ,  H04W24/02 ,  H04B7/08 ,  H04W72/12 ,  H04L12/751 ,  H04B7/06

CPC classification number: H04W40/16 ,  H04B7/0617 ,  H04B7/086 ,  H04W24/02 ,  H04W28/0236 ,  H04W72/1231

Abstract: In one embodiment, a method includes, by a controller of a multi-hop wireless network, accessing an interference map indicating interference among network nodes of the multi-hop wireless network. The controller may generate a factor-graph representation of the multi-hop wireless network that includes a first set of vertices which represent variable nodes and correspond to transmitting (TX) sectors of the network nodes and a second set of vertices which represent function nodes and correspond to receiving (RX) sectors of the network nodes. The controller may determine a time-slot-exclusion schedule for one or more network nodes of the multi-hop wireless network to reduce interference among network nodes of the multi-hop wireless network, wherein only certain sectors of the particular network nodes may transmit or receive during certain time slots in the time-slot-exclusion schedule.

公开(公告)号：US20170195215A1

公开(公告)日：2017-07-06

申请号：US15382682

申请日：2016-12-18

Applicant: Facebook, Inc.

Inventor： Krishna Gomadam ,  Djordje Tujkovic ,  Sanjai Kohli

IPC: H04L12/721 ,  H04L12/26 ,  H04L12/24

CPC classification number: H04L45/26 ,  H04B7/0695 ,  H04B7/088 ,  H04L41/12 ,  H04L43/08

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.

公开(公告)号：US09698885B1

公开(公告)日：2017-07-04

申请号：US14986471

申请日：2015-12-31

Applicant: Facebook, Inc.

Inventor： Sanjai Kohli ,  Djordje Tujkovic ,  Kirshna Gomadam

IPC: H04K1/10 ,  H04B7/06 ,  H04B7/0408 ,  H04L7/00

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.

公开(公告)号：US11011840B2

公开(公告)日：2021-05-18

申请号：US16248613

申请日：2019-01-15

Applicant: Facebook, Inc.

Inventor： Krishna S. Gomadam ,  Djordje Tujkovic ,  Sanjai Kohli

IPC: H01Q3/34 ,  H01Q3/28 ,  H01Q3/26 ,  H01Q21/00 ,  H04B7/06 ,  H04B17/12

Abstract: Systems and associated methods for improved beamforming of the phase array antenna are disclosed herein. In one embodiment, a communication system for wireless signals has a phase array antenna having a plurality of individual antennas and a plurality of electrically conductive traces. The individual traces electrically connect corresponding individual antennas with a transmitter. The lengths of individual traces Ti, Tk satisfy equation Abs((Ti−Tk)mod(λ))

公开(公告)号：US20210105699A1

公开(公告)日：2021-04-08

申请号：US17102077

申请日：2020-11-23

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic

IPC: H04W40/16 ,  H04W72/12 ,  H04W24/02 ,  H04B7/06 ,  H04B7/08 ,  H04W28/02

Abstract: In one embodiment, an interference-management system of a multi-hop wireless network may access an interference map indicating interference among network nodes, identify a plurality of links between network nodes, wherein one or more of the links are identified as golden links, generate a factor-graph representation comprising a set of first vertices corresponding to a respective set of second vertices, wherein each vertex pair is associated with an identified link, wherein, for each vertex pair, the first vertex is a variable node representing beamforming weight variables associated with the link and each second vertex is a function node representing a capacity equation associated with the link, wherein each vertex pair is assigned a capacity weight from a set of non-equal capacity weights based at least in part on the identified golden links, and determine one or more adjustments to one or more beamforming weights to reduce interference among the network nodes.

公开(公告)号：US10757743B2

公开(公告)日：2020-08-25

申请号：US16174651

申请日：2018-10-30

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic ,  Krishna Gomadam ,  Vish Ponnampalam

IPC: H03G3/00 ,  H04B10/294 ,  H04W76/14 ,  H04K3/00 ,  H04W28/04 ,  H04L27/26 ,  H04L25/02 ,  H04B1/10 ,  H04L25/03

Abstract: Methods, apparatuses, and systems for packet detection in a point-to-point wireless communication network is disclosed. One method includes receiving, by a receiving node, a plurality of packets, adjusting, by an adjustable gain amplifier of the receiving node, a power level of the received plurality of packets, controlling, by a gain control module, a gain of the adjustable gain amplifier, thereby controlling the power level of the received plurality of packets, monitoring the controlled gain of the gain control module over a period of time, identifying a timing of reception of interfering packets based on the monitoring of the controlled gain of the gain control module over the period of time, and adjustably controlling, by the gain control module, the gain of the adjustable gain amplifier based on the identified timing of reception of the interfering packets.

公开(公告)号：US10587499B2

公开(公告)日：2020-03-10

申请号：US16218240

申请日：2018-12-12

Applicant: Facebook, Inc.

Inventor： Krishna Srikanth Gomadam ,  Lakshmi Pradeep ,  Djordje Tujkovic

IPC: H04B7/00 ,  H04L12/721 ,  H04B7/06 ,  H04B7/08 ,  H04L12/24 ,  H04L12/26

Abstract: Embodiments for a wireless node utilizing a limited memory radio frequency integrated circuit (RFIC) are disclosed. For an embodiment, the wireless node includes a plurality of antennas operative to form a plurality of wireless beams, wherein a direction of each of the plurality of wireless beams is controlled by selecting a phase and amplitude adjustment of a communication signal communicated through each of the plurality of antennas. The wireless node includes a memory that includes a first portion and a second portion, wherein phase and amplitude settings for each of the plurality of targets are stored in the first portion, and wherein alternate phase and amplitude setting are dynamically store in the second portion. Phase and amplitude settings are accessed from the first portion when the wireless node is communicating with targets. The second portion is utilized for storing alternate settings when testing wireless communication with the targets.