公开(公告)号：US20180294898A1

公开(公告)日：2018-10-11

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: H04B17/12 ,  H04L25/02 ,  H01Q3/26 ,  H04B7/0417 ,  H04B7/06 ,  H04B7/024

CPC classification number: H04B17/12 ,  H01Q3/26 ,  H04B7/024 ,  H04B7/0417 ,  H04B7/0626 ,  H04B17/14 ,  H04B17/21 ,  H04L5/14 ,  H04L25/0248

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：US20190238368A1

公开(公告)日：2019-08-01

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 ,  H04L25/03 ,  H04B7/0413

CPC classification number: H04L25/0246 ,  H04B7/0413 ,  H04L25/0204 ,  H04L25/0244 ,  H04L25/03159 ,  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：US20180287674A1

公开(公告)日：2018-10-04

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: H04B7/0456 ,  H04B7/06

CPC classification number: H04B7/0452 ,  H04B7/0426

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.