公开(公告)号：US10531426B2

公开(公告)日：2020-01-07

申请号：US16395579

申请日：2019-04-26

Applicant: Marvell World Trade Ltd.

Inventor： Xiayu Zheng ,  Xilin Cheng ,  Zhipei Chi ,  Shiyu Xu

IPC: H04W48/04 ,  H04W64/00 ,  H04B7/06 ,  H04B17/318 ,  H04W4/02

Abstract: Embodiments described herein provide a method for detecting motion. At a first wireless communication device capable of wirelessly communicating with a second wireless communication device, channel state information (CSI) for the wireless channel between the first and second wireless communication devices is received. A nulling matrix is calculated based on the received CSI. The calculated nulling matrix is applied to a plurality of short packets scheduled to be periodically transmitted from the first wireless communication device to the second wireless communication device. The first wireless communication device receives, from the second wireless communication device, received signal strength information (RSSI) determined for each of the transmitted plurality of short packets. The method further includes detecting motion based on detecting a change in the RSSI received from the second wireless communication device.

公开(公告)号：US20200068522A1

公开(公告)日：2020-02-27

申请号：US16547337

申请日：2019-08-21

Applicant: Marvell World Trade Ltd.

Inventor： Xiayu Zheng ,  Xilin Cheng ,  Zhipei Chi

IPC: H04W64/00 ,  H04B17/318 ,  H04B17/336 ,  H04B17/391

Abstract: This disclosure describes systems and methods for detecting motion based on channel correlation in wireless communication signals. A receiver at a first wireless communication device is capable of wirelessly communicating with a second wireless communication device. The first wireless communication device is configured to receive from the second wireless communication device via two or more subcarriers a first packet and a channel correlation for the first packet across the two or more subcarriers. Control circuitry is configured to estimate a channel energy difference for the receiver based on the channel correlation for the first packet. A motion detection decision is then made based on the estimated channel energy difference.

公开(公告)号：US10694491B2

公开(公告)日：2020-06-23

申请号：US16547337

申请日：2019-08-21

Applicant: Marvell World Trade Ltd.

Inventor： Xiayu Zheng ,  Xilin Cheng ,  Zhipei Chi

IPC: H04W64/00 ,  H04B17/391 ,  H04B17/336 ,  H04B17/318

Abstract: This disclosure describes systems and methods for detecting motion based on channel correlation in wireless communication signals. A receiver at a first wireless communication device is capable of wirelessly communicating with a second wireless communication device. The first wireless communication device is configured to receive from the second wireless communication device via two or more subcarriers a first packet and a channel correlation for the first packet across the two or more subcarriers. Control circuitry is configured to estimate a channel energy difference for the receiver based on the channel correlation for the first packet. A motion detection decision is then made based on the estimated channel energy difference.

公开(公告)号：US20190335417A1

公开(公告)日：2019-10-31

申请号：US16395579

申请日：2019-04-26

Applicant: Marvell World Trade Ltd.

Inventor： Xiayu Zheng ,  Xilin Cheng ,  Zhipei Chi ,  Shiyu Xu

IPC: H04W64/00 ,  H04W4/02 ,  H04B17/318 ,  H04B7/06

Abstract: Embodiments described herein provide a method for detecting motion. At a first wireless communication device capable of wirelessly communicating with a second wireless communication device, channel state information (CSI) for the wireless channel between the first and second wireless communication devices is received. A nulling matrix is calculated based on the received CSI. The calculated nulling matrix is applied to a plurality of short packets scheduled to be periodically transmitted from the first wireless communication device to the second wireless communication device. The first wireless communication device receives, from the second wireless communication device, received signal strength information (RSSI) determined for each of the transmitted plurality of short packets. The method further includes detecting motion based on detecting a change in the RSSI received from the second wireless communication device.