公开(公告)号：US20190173171A1

公开(公告)日：2019-06-06

申请号：US16248613

申请日：2019-01-15

Applicant: Facebook, Inc.

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

IPC: H01Q3/34 ,  H01Q21/00 ,  H01Q3/26 ,  H01Q3/28

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：US20190069332A1

公开(公告)日：2019-02-28

申请号：US16174651

申请日：2018-10-30

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic ,  Krishna Gomadam ,  Vish Ponnampalam

IPC: H04W76/14 ,  H04W28/04 ,  H04L27/26

CPC classification number: H04W76/14 ,  H04K3/825 ,  H04L25/0226 ,  H04L27/2692 ,  H04L2025/03789 ,  H04L2025/03796 ,  H04W28/04

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：US20180014267A1

公开(公告)日：2018-01-11

申请号：US15696339

申请日：2017-09-06

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic

IPC: H04W56/00 ,  H04L5/00 ,  H04B7/06 ,  H04W4/20

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 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：US20170264352A1

公开(公告)日：2017-09-14

申请号：US15604943

申请日：2017-05-25

Applicant: Facebook, Inc.

Inventor： Sanjai Kohli ,  Djordje Tujkovic ,  Krishna Gomadam

IPC: 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：US20170195939A1

公开(公告)日：2017-07-06

申请号：US15392893

申请日：2016-12-28

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic

IPC: H04W40/16 ,  H04B7/08 ,  H04W52/28 ,  H04L12/751 ,  H04J3/00 ,  H04B7/06 ,  H04W24/02

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 one or more adjustments to one or more beamforming weights of sectors of the network nodes, wherein for each of the TX or RX sectors, a beamforming weight is determined by a marginal a posteriori probability for each variable of the beamforming weight; and the adjustments reduce interference among the network nodes to increase a sum capacity of the multi-hop wireless network.

公开(公告)号：US20170195938A1

公开(公告)日：2017-07-06

申请号：US15382676

申请日：2016-12-18

Applicant: Facebook, Inc.

Inventor： Krishna Gomadam ,  Djordje Tujkovic ,  Sanjai Kohli

IPC: H04W40/12 ,  H04W24/08 ,  H04W16/28

CPC classification number: H04W40/12 ,  H04W16/28 ,  H04W24/08

Abstract: Apparatuses, methods, and systems for charactering and selecting micro-routes between nodes of a wireless network are disclosed. One method includes wirelessly communicating between a first node and a second node through a wireless link formed by at least one micro-route, determining a condition of the at least one micro-route, and selecting at least one other micro-route for communication between the first node and the second node based on a level of correlation between the at least one micro-route and the at least one other micro-route, after determining the condition.

公开(公告)号：US20170195145A1

公开(公告)日：2017-07-06

申请号：US15248378

申请日：2016-08-26

Applicant: Facebook, Inc.

Inventor： Vish Ponnampalam ,  Krishna Gomadam ,  Djordje Tujkovic

IPC: H04L25/03 ,  H04W72/08 ,  H04W28/04

CPC classification number: H04J11/0056 ,  H04J13/0014 ,  H04J13/16 ,  H04L2025/03789 ,  H04L2025/03796

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.

公开(公告)号：US09647335B1

公开(公告)日：2017-05-09

申请号：US14986490

申请日：2015-12-31

Applicant: Facebook, Inc.

Inventor： Djordje Tujkovic ,  Krishna Gomadam

IPC: H04B7/06 ,  H01Q3/34

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.

公开(公告)号：US20170005408A1

公开(公告)日：2017-01-05

申请号：US14790847

申请日：2015-07-02

Applicant: Facebook, Inc.

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

IPC: H01Q3/34 ,  H01Q21/00 ,  H01Q3/28

CPC classification number: H01Q3/34 ,  H01Q3/267 ,  H01Q3/28 ,  H01Q21/0006

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))

Abstract translation: 本文公开了用于改进相位阵列天线的波束形成的系统和相关方法。 在一个实施例中，用于无线信号的通信系统具有具有多个单独天线和多个导电迹线的相位阵列天线。 单独的迹线将相应的单独天线与发射机电连接。 单个轨迹Ti，Tk的长度满足公式Abs（（Ti-Tk）mod（λ））<λ/ B，其中λ是无线信号的波长，λ/ B是λ的分数。