公开(公告)号：US20190115988A1

公开(公告)日：2019-04-18

申请号：US16091985

申请日：2017-04-21

Applicant: Boyu Li ,  Ping Liang ,  Dengkui Zhu

Inventor： Boyu Li ,  Ping Liang ,  Dengkui Zhu

IPC: H04B17/10 ,  H04L5/00 ,  H04L27/26 ,  H04B7/0452 ,  H04B7/06 ,  H04L25/02

Abstract: This invention presents a channel emulator for testing a multi-user multiple input multiple output (MU-MIMO) wireless communication system using an over-the-air (OTA) connection between the antennas of a base station (BS) and the channel emulator. It uses pilot signals with special structures to estimate the channel matrix between the BS and the channel emulator, equalizes the channel when performing emulation of the channels between the BS and a plural of user equipment (UEs) in MU-MIMO communication.

公开(公告)号：US10171217B2

公开(公告)日：2019-01-01

申请号：US15537877

申请日：2016-01-16

Applicant: Jason Brent ,  Dengkui Zhu ,  Ping Liang

Inventor： Jason Brent ,  Dengkui Zhu ,  Ping Liang

IPC: H04L5/00 ,  H04B7/04 ,  H04B7/0452 ,  H04B7/0456 ,  H04B7/06 ,  H04W72/04

Abstract: This invention provides SRS transmission methods to meet the Massive MIMO systems requirements. These methods are described in two separate categories. Firstly, enhancements to multiplex more channels in the same resources for a given SRS transmission and to provide Massive MIMO throughput performance improvements. Secondly, scheduling enhancements to provide adaptive UE-specific scheduling based on channel conditions for each UE. These methods can be combined in different ways in each BS to optimize the channel estimation system capacity for a given level of system performance.

公开(公告)号：US20180152226A1

公开(公告)日：2018-05-31

申请号：US15576238

申请日：2016-06-15

Applicant: Ping LIANG

Inventor： Boyu Li ,  Dengkui Zhu ,  Ping Liang

IPC: H04B7/0452 ,  H04L5/00 ,  H04L5/14

CPC classification number: H04B7/0452 ,  H04B7/00 ,  H04B7/02 ,  H04L5/0037 ,  H04L5/0057 ,  H04L5/006 ,  H04L5/14 ,  H04L43/00 ,  H04W88/02 ,  H04W88/08

Abstract: This invention presents a method for frequency resource allocation in a MU-MTMO system comprising assigning UEs with CQI higher than a predefined value and/or CEE lower than a predefined value and/or SII lower than a predefined value to a first group and the rest UEs to a second group, allocating different frequency resource to each group, and applying different precoding or decoding algorithm to each group.

公开(公告)号：US09954591B2

公开(公告)日：2018-04-24

申请号：US15537821

申请日：2016-01-16

Applicant: Ping Liang

Inventor： Ping Liang ,  Dengkui Zhu ,  Boyu Li

IPC: H04B7/06 ,  H04B7/0452

CPC classification number: H04B7/0617 ,  H04B7/0452

Abstract: This invention provides methods for Distributed Massive MIMO (DM-MIMO) that use one or more central Baseband Units (BBUs), one or more Multi-User Beamformers for each BBU performing multi-user MIMO computations, and a number of RRHs distributed over a geographic area.

公开(公告)号：US20180006743A1

公开(公告)日：2018-01-04

申请号：US15537879

申请日：2016-01-16

Applicant: Ping Liang

Inventor： Dengkui Zhu ,  Boyu Li ,  Ping Liang

IPC: H04B17/336 ,  H04B7/0417 ,  H04L1/20 ,  H04L25/02 ,  H04B7/0452 ,  H04B7/06 ,  H04L5/00

CPC classification number: H04B17/336 ,  H04B7/0413 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/20 ,  H04L1/206 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204

Abstract: This invention presents methods for estimating the uplink SINR and channel estimation error level in MU-MIMO wireless communication systems comprising the BS obtaining the channel coefficients between each receiving antenna of a BS and a transmitting antenna of a UE in the uplink; for the BS estimating the SU-MIMO SINR of a UE using the channel coefficients between a UE and the BS; for the BS estimating the channel estimation error level of a UE using the channel coefficients between a UE and the BS.

公开(公告)号：US20170373737A1

公开(公告)日：2017-12-28

申请号：US15537821

申请日：2016-01-16

Applicant: Ping LIANG

Inventor： Ping Liang ,  Dengkui Zhu ,  Boyu Li

IPC: H04B7/06 ,  H04B7/0452

CPC classification number: H04B7/0617 ,  H04B7/0452

Abstract: This invention provides methods for Distributed Massive MIMO (DM-MIMO) that use one or more central Baseband Units (BBUs), one or more Multi-User Beamformers for each BBU performing multi-user MIMO computations, and a number of RRHs distributed over a geographic area.

公开(公告)号：US09692577B2

公开(公告)日：2017-06-27

申请号：US15101949

申请日：2014-12-20

Applicant: Ping Liang

Inventor： Ping Liang ,  Dengkui Zhu

IPC: H04L12/28 ,  H04L5/00 ,  H04W72/04 ,  H04L5/14 ,  H04W72/08 ,  H04J1/16 ,  H04L1/00

CPC classification number: H04L5/0053 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0035 ,  H04L5/14 ,  H04W72/0453 ,  H04W72/085

Abstract: This invention presents methods and circuits for a BS to acquire DL CSI in a FDD wireless network comprising switching the normal transmitting and receiving frequencies in a first and a second FDD apparatus, and using UL pilot signals to estimate the DL CSI based on reciprocity of the over the air channels.

公开(公告)号：US11489598B2

公开(公告)日：2022-11-01

申请号：US16091985

申请日：2017-04-21

Applicant: Boyu Li ,  Ping Liang ,  Dengkui Zhu

Inventor： Boyu Li ,  Ping Liang ,  Dengkui Zhu

IPC: H04B17/10 ,  H04B7/0452 ,  H04B17/391 ,  H04B17/12 ,  H04B17/21 ,  H04B7/06 ,  H04L5/00 ,  H04L25/02 ,  H04L27/26

Abstract: This invention presents a channel emulator for testing a multi-user multiple input multiple output (MU-MIMO) wireless communication system using an over-the-air (OTA) connection between the antennas of a base station (BS) and the channel emulator. It uses pilot signals with special structures to estimate the channel matrix between the BS and the channel emulator, equalizes the channel when performing emulation of the channels between the BS and a plural of user equipment (UEs) in MU-MIMO communication.

公开(公告)号：US20210305713A1

公开(公告)日：2021-09-30

申请号：US17141906

申请日：2021-01-05

Applicant: Ping Liang ,  Dengkui Zhu

Inventor： Ping Liang ,  Dengkui Zhu

IPC: H01Q15/18 ,  H01Q1/24 ,  H01Q1/52 ,  H04B7/0413 ,  H04B7/10 ,  H01Q21/26 ,  H01Q21/24

Abstract: This invention presents embodiments of a coupler array to couple the RF signals between the antenna array of a MIMO base station and a MIMO RF channel emulator. The embodiments enable testing of a large scale MIMO wireless communication system without the need of connecting a large number of RF cables to the antenna ports of the MIMO base station.

公开(公告)号：US11075672B2

公开(公告)日：2021-07-27

申请号：US16528568

申请日：2019-07-31

Applicant: Ping Liang ,  Dengkui Zhu

Inventor： Ping Liang ,  Dengkui Zhu

IPC: H04B7/024 ,  H04B7/0452 ,  H04B7/0417 ,  H04B17/318 ,  H04B7/06

Abstract: This invention presents Capacity Projectors (CaPs) for intelligent control and management that collect information on channel conditions, actual and/or predicted demand for connectivity, data throughput and its distribution for a first time period in the future using signaling and control messages, analyze the collected information to identify the configurations of the BSs and CaPs that are needed to produce desired MU-MIMO communication channels in the first time period to meet the connectivity and data throughput demand and its distribution in the first time period, and adaptively control and configure the CaPs to actively shape the MU-MIMO communication channels to meet the predicted demand and its distribution, wherein controlling and configuring the CaP comprises implementing which of the CaPs to switch to sleeping mode or work mode and adjusting one or more of transmitting power gain, antenna tilt, beam direction and/or pattern of the transmitter and/or receiver, filtering of the receiving and/or transmitting signal.