公开(公告)号：US10797805B1

公开(公告)日：2020-10-06

申请号：US16521109

申请日：2019-07-24

Applicant: Cisco Technology, Inc.

Inventor： Khashayar Mirfakhraei ,  Ardalan Alizadeh ,  Xu Zhang ,  Gautam Dilip Bhanage ,  Daniel Joseph Lyons

IPC: G06N99/00 ,  H04L12/24 ,  H04W24/04 ,  H04B17/10 ,  G06N3/08 ,  H04L29/08 ,  H04W88/12 ,  H04W88/08

Abstract: In one embodiment, a process tracks measured carrier frequency offsets (CFOs) of identified transmitters over a period of activity of the identified transmitters, and determines predicted CFOs for the identified transmitters and predicted transmitter behavior as a probability of specific transmitters of the identified transmitters being active at given times based on the activity of the identified transmitters. The process may then determine, based on the predicted CFOs and predicted transmitter behavior, CFO ranges that a receiver should expect for upcoming packets, and instructs the receiver to use the CFO ranges as a prioritized list of dynamically selected CFOs to use to extract single or colliding packets from among potential interferences using frequency demodulation.

公开(公告)号：US09866416B2

公开(公告)日：2018-01-09

申请号：US15274215

申请日：2016-09-23

Applicant: Cisco Technology, Inc.

Inventor： Daniel Joseph Lyons

IPC: H04L27/26 ,  H04B7/0452 ,  H04L5/00 ,  H04W84/12

CPC classification number: H04L27/2601 ,  H04B7/0452 ,  H04L5/0007 ,  H04L27/2672 ,  H04W84/12

Abstract: Embodiments of the present invention relate to methods and systems for simultaneous communication with multiple wireless communication devices. In some embodiments, a method for simultaneous communication with multiple wireless communication devices includes receiving, using a plurality of antennas at a first wireless station, a plurality of packets, comprised of orthogonal frequency division multiplexing (OFDM) wireless signals, transmitted simultaneously from a plurality of other wireless stations wherein each of the simultaneously transmitted packets includes a plurality of frequency tones, frequency domain transform the received packets, grouping frequency domain transform outputs for each subcarrier, determining a difference between subcarrier groups formed over different sample sets, and determining a set of weights for each subcarrier, wherein the weights are selected such that the first wireless station can at least one of detect or demodulate the received plurality of packets.

公开(公告)号：US20200288323A1

公开(公告)日：2020-09-10

申请号：US16293218

申请日：2019-03-05

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Daniel Joseph Lyons ,  Pooya Monajemi ,  John Matthew Swartz

IPC: H04W16/10 ,  H04W74/08 ,  H04L1/00 ,  H04W72/04 ,  H04W80/08 ,  H04B17/336 ,  H04W72/08

Abstract: In one illustrative example, a device configured for use in a wireless local area network (WLAN) may cause a spatial reuse (SR) adjustment to be performed based on data received from a multi-user receiver procedure for the blind detection and demodulation of colliding packets from multiple stations. This procedure may be performed by one or more access points (APs) and/or distributed sensor nodes, each having such a multi-user receiver. The procedure may involve receiving and decoding, over a channel, a first spatial stream from a first device of a first base service set (BSS) color; simultaneously receiving and decoding, over the channel, a second spatial stream from a second device of a second BSS color (i.e. an overlapping BSS or “OBSS”); and calculating a signal-to-interference ratio (SIR) based on signal levels associated with the streams. The SR adjustment may involve adjusting an OBSS Packet Detect (PD) (OBSS-PD) threshold.

公开(公告)号：US11153760B2

公开(公告)日：2021-10-19

申请号：US16293218

申请日：2019-03-05

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Daniel Joseph Lyons ,  Pooya Monajemi ,  John Matthew Swartz

IPC: H04W16/10 ,  H04W74/08 ,  H04L1/00 ,  H04W72/04 ,  H04B17/336 ,  H04W72/08 ,  H04W80/08 ,  H04W72/12 ,  H04W16/14 ,  H04B7/0452 ,  H04W84/12

Abstract: In one illustrative example, a device configured for use in a wireless local area network (WLAN) may cause a spatial reuse (SR) adjustment to be performed based on data received from a multi-user receiver procedure for the blind detection and demodulation of colliding packets from multiple stations. This procedure may be performed by one or more access points (APs) and/or distributed sensor nodes, each having such a multi-user receiver. The procedure may involve receiving and decoding, over a channel, a first spatial stream from a first device of a first base service set (BSS) color; simultaneously receiving and decoding, over the channel, a second spatial stream from a second device of a second BSS color (i.e. an overlapping BSS or “OBSS”); and calculating a signal-to-interference ratio (SIR) based on signal levels associated with the streams. The SR adjustment may involve adjusting an OBSS Packet Detect (PD) (OBSS-PD) threshold.

公开(公告)号：US20150207554A1

公开(公告)日：2015-07-23

申请号：US14670051

申请日：2015-03-26

Applicant: Cisco Technology, Inc.

Inventor： Eldad Perahia ,  Bretton Lee Douglas ,  Brian Hart ,  Daniel Joseph Lyons

IPC: H04B7/06 ,  H04L27/26 ,  H04L25/02

CPC classification number: H04B7/0608 ,  H04B7/0602 ,  H04B7/0615 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03343 ,  H04L27/2601 ,  H04L2027/0095 ,  H04W84/12

Abstract: A method and an apparatus in a first wireless station of a network transmitting to a second wireless station. The network uses multi-tone OFDM signals. The first station includes multiple antennas and a receive and a transmit signal path per antenna. Each receive signal path includes a discrete Fourier transformer determining the tones in a received signal, and each transmit signal path includes an inverse discrete Fourier transformer converting tones to a signal. The method includes determining channel estimates for each tone and each receive path while receiving from the second station, determining transmit weights to transmit to the second station, tone-by-tone weighting a signal for transmission to the second station to produce weighted tone sets for each transmit signal path, and transmitting the weighted tone sets. The first station is configured so that the weighting produces additive beamforming without the second station needing multiple antennas.

Abstract translation: 一种发送到第二无线站的网络的第一无线站中的方法和装置。 网络使用多音频OFDM信号。 第一站包括多个天线以及每个天线的接收和发射信号路径。 每个接收信号路径包括确定接收信号中的音调的离散傅里叶变换器，并且每个发射信号路径包括将音调转换为信号的离散傅立叶变换逆变换器。 该方法包括确定每个音调和每个接收路径的信道估计，同时从第二站接收确定发送权重以发送给第二站，逐个音调加权信号以传输到第二站以产生加权音调集合 每个发送信号路径，并发送加权音调集。 第一站被配置为使得加权产生加法波束成形，而不需要第二站需要多个天线。