公开(公告)号：US10979251B2

公开(公告)日：2021-04-13

申请号：US16378411

申请日：2019-04-08

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Brian D. Hart ,  Jiunming Huang ,  Matthew A. Silverman

IPC: H04L25/02 ,  H04B7/0413 ,  H04L25/03 ,  H04W84/12 ,  H04W88/12

Abstract: The embodiments herein use a factorization based technique for determining filter coefficients for a subset of the subcarriers in a wireless frequency band. Once the filter coefficients for the subset of the subcarriers are calculated, the network device uses these filter coefficients to identify the filter coefficients in a neighboring subcarrier. To do so, the network device uses pseudo-inverse iteration to convert the already calculated filter coefficients into filter coefficients for a neighboring subcarrier. The network device can repeat this process for the next set of neighboring subcarriers until all the filter coefficients have been calculated.

公开(公告)号：US09942020B1

公开(公告)日：2018-04-10

申请号：US15497558

申请日：2017-04-26

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Brian D. Hart ,  Matthew A. Silverman

IPC: H04B1/10 ,  H04L5/00 ,  H04B7/0413 ,  H04W72/08 ,  H04W72/04

CPC classification number: H04L5/0062 ,  H04B7/0413 ,  H04J11/0036 ,  H04L5/0098 ,  H04L25/03

Abstract: Embodiments herein describe recovering data packets received by a plurality of wireless antennas of a radio head. In one embodiment, the signals received by the radio head are filtered using a single filter to recover at least one data packet. In another embodiment, the signals received by the radio head are filtered using a plurality of filters to recover at least one data packet. In one embodiment, a controller coupled with the radio head filters the received signals and recovers the at least one data packet.

公开(公告)号：US20180176044A1

公开(公告)日：2018-06-21

申请号：US15381630

申请日：2016-12-16

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Brian D. Hart ,  Jiunming Huang ,  Matthew Silverman

IPC: H04L25/02 ,  H04B7/0452 ,  H04B7/06

CPC classification number: H04L25/0246 ,  H04B7/0413 ,  H04L25/0204 ,  H04L25/0244 ,  H04L25/03159

Abstract: The embodiments herein use a factorization based technique for determining filter coefficients for a subset of the subcarriers in a wireless frequency band. Once the filter coefficients for the subset of the subcarriers are calculated, the network device uses these filter coefficients to identify the filter coefficients in a neighboring subcarrier. To do so, the network device uses pseudo-inverse iteration to convert the already calculated filter coefficients into filter coefficients for a neighboring subcarrier. The network device can repeat this process for the next set of neighboring subcarriers until all the filter coefficients have been calculated.

公开(公告)号：US09991972B1

公开(公告)日：2018-06-05

申请号：US15497969

申请日：2017-04-26

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Matthew A. Silverman ,  Paul J. Stager ,  Brian D. Hart ,  Jiunming Huang

IPC: H04B15/00 ,  H04B17/12 ,  H04L25/02 ,  H04B7/06 ,  H04B7/0413

CPC classification number: H04B17/12 ,  H04B7/022 ,  H04B7/0617 ,  H04L25/0202

Abstract: Embodiments herein describe calibrating a plurality of radio heads having a plurality of wireless antennas. In one embodiment, the plurality of radio heads communicate a calibration signal in a round robin fashion such that each of the radio heads communicates a respective calibration signal to the remaining radio heads. In one embodiment, at least one of the radio heads is isolated from the remaining radio heads. The received calibration signals are then used to calibrate the radio heads. In one embodiment, a controller coupled with the plurality of radio heads calibrates the radio heads. The calibrated radio heads then communicate to one or more client devices.

公开(公告)号：US10367550B2

公开(公告)日：2019-07-30

申请号：US15477620

申请日：2017-04-03

Applicant: Cisco Technology, Inc.

Inventor： David S. Kloper ,  Mithat C. Dogan ,  Matthew A. Silverman ,  Brian D. Hart ,  Jiunming Huang

IPC: H04B7/0426 ,  H04B7/0452

Abstract: The present disclosure discloses that a device uses precoding to transmit independent data streams to existing users and additional independent data streams to one or more new users simultaneously. During a first transmission of a first one or more data streams that are precoded using a first precoding matrix, the device determines to transmit a second one or more data streams in a second transmission. Before the first transmission is complete, the device calculates a combined precoding matrix for precoding the first one or more data streams and the second one or more data streams. The device transmits the first one or more data streams in the first transmission and the second one or more data streams in the second transmission simultaneously using the combined precoding matrix.

公开(公告)号：US10326538B2

公开(公告)日：2019-06-18

申请号：US15480197

申请日：2017-04-05

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Jiunming Huang ,  Brian D. Hart ,  Matthew A. Silverman

IPC: H04B7/06 ,  H04B17/12 ,  H04B17/14 ,  H04B17/21 ,  H01Q3/26 ,  H04B7/024 ,  H04B7/0417 ,  H04L25/02 ,  H04L5/14

Abstract: Embodiments herein describe calibrating a plurality of radio heads having a plurality of wireless antennas. In one embodiment, the plurality of radio heads communicate a calibration signal in a round robin fashion such that each of the radio heads communicates a respective calibration signal to the remaining radio heads. The received calibration signals are then used to calibrate the radio heads. In one embodiment, a controller coupled with the plurality of radio heads calibrates the radio heads. The calibrated radio heads then communicate to one or more client devices.

公开(公告)号：US10256997B2

公开(公告)日：2019-04-09

申请号：US15381630

申请日：2016-12-16

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Brian D. Hart ,  Jiunming Huang ,  Matthew Silverman

IPC: H04L25/02 ,  H04L25/03 ,  H04B7/0413 ,  H04W84/12 ,  H04W88/12

Abstract: The embodiments herein use a factorization based technique for determining filter coefficients for a subset of the subcarriers in a wireless frequency band. Once the filter coefficients for the subset of the subcarriers are calculated, the network device uses these filter coefficients to identify the filter coefficients in a neighboring subcarrier. To do so, the network device uses pseudo-inverse iteration to convert the already calculated filter coefficients into filter coefficients for a neighboring subcarrier. The network device can repeat this process for the next set of neighboring subcarriers until all the filter coefficients have been calculated.