公开(公告)号：US11139908B2

公开(公告)日：2021-10-05

申请号：US16302676

申请日：2017-09-22

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi Gao ,  Chen Sun ,  Wenjin Wang ,  Li You ,  Anan Lu ,  Wen Zhong

IPC: H04L5/00 ,  H04W72/04 ,  H04J14/08 ,  H04B10/11 ,  H04B10/50 ,  H04B7/06

Abstract: The invention discloses a beam domain optical wireless communication method and system. A base station is equipped with an array of optical transceiver ports or transmitter/receiver ports and a lens, each optical transceiver port forms a beam with centralized energy through the lens, and the base station generates beams in different directions by using the optical transceiver port array and the lens, thereby realizing multi-beam coverage or large-scale beam coverage in a communication region. The base station transmits/receives signals of multiple or a large number of user terminals by using channel state information of each user terminal, and different optical transceiver ports transmit/receive signals in different directions, thereby realizing simultaneous communication and bidirectional communication between the base station and different user terminals.

公开(公告)号：US11177863B2

公开(公告)日：2021-11-16

申请号：US16643560

申请日：2017-10-16

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi Gao ,  Anan Lu ,  Wen Zhong

IPC: H04B1/04 ,  H04B7/0456 ,  H04B7/0417

Abstract: A massive multiple-input multiple-output (MIMO) robust precoding transmission method under imperfect channel state information (CSI), wherein the imperfect CSI obtained by the base station (BS) side of the massive MIMO system is modeled as an a posteriori statistical channel model including channel mean and channel variance information. The model considers the effects of channel estimation error, channel aging and spatial correlation. The BS performs the robust precoding transmission by using the a posteriori statistical channel model, so that the universality problem of the massive MIMO to various typical moving scenarios can be solved, and high spectral efficiency is achieved.

公开(公告)号：US09462599B2

公开(公告)日：2016-10-04

申请号：US14232193

申请日：2013-04-19

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi Gao ,  Chen Sun ,  Shi Jin ,  Bin Jiang ,  Wen Zhong ,  Dongming Wang ,  Teer Ba

IPC: H04W72/12 ,  H04L5/00 ,  H04B7/04 ,  H04B7/06 ,  H04W72/04 ,  H04W88/08 ,  H04W72/08

CPC classification number: H04W72/12 ,  H04B7/04 ,  H04B7/0617 ,  H04L5/0005 ,  H04L5/0007 ,  H04L5/0048 ,  H04W72/046 ,  H04W72/085 ,  H04W88/08

Abstract: A wireless communication method utilizes a large-scale antenna array, which is deployed at the base station and can be a one-dimensional or two-dimensional array and can form tens of beams over the area covered by the base station. The communications method utilizes beam domain division of spatial resources at the base station side utilizing an analog multi-beam forming network or a digital domain multi-beam forming method. The base station carries out wireless communication with multiple users with the same time frequency resource and with the communications process implemented in the beam domain. Scheduling is accomplished through the utilization of a deterministic unitary matrix to form beams. The unitary matrix is a correlation matrix of interference that includes a channel characteristics mode energy coupling matrix, the beam allocation providing beam sets of different users that are non-overlapping to distinguish users in the beam domain.

Abstract translation: 无线通信方法利用在基站部署的大型天线阵列，并且可以是一维或二维阵列，并且可以在由基站覆盖的区域上形成数十个波束。 通信方法利用模拟多波束形成网络或数字域多波束形成方法在基站侧利用空间资源的波束域划分。 基站与同一时间频率资源的多个用户进行无线通信，并在波束域中实现通信过程。 通过利用确定性酉矩阵来形成波束来实现调度。 酉矩阵是包括信道特征模式能量耦合矩阵的干扰相关矩阵，波束分配提供不重叠以区分波束域中的用户的不同用户的波束组。

公开(公告)号：US20150334726A1

公开(公告)日：2015-11-19

申请号：US14232193

申请日：2013-04-19

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi Gao ,  Chen Sun ,  Shi Jin ,  Bin Jiang ,  Wen Zhong ,  Dongming Wang ,  Teer Ba

IPC: H04W72/12 ,  H04B7/06 ,  H04L5/00 ,  H04B7/04

CPC classification number: H04W72/12 ,  H04B7/04 ,  H04B7/0617 ,  H04L5/0005 ,  H04L5/0007 ,  H04L5/0048 ,  H04W72/046 ,  H04W72/085 ,  H04W88/08

Abstract: The present invention provides a wireless communication method that utilizes large-scale antenna array. The method comprises: deploying a large-scale antenna array at the base station side wherein, the antenna array can be an one-dimensional or two-dimensional array, and can form tens of beam coverage over the area covered by the base station; accomplishing beam domain division of spatial resources at the base station side with an analog multi-beam forming network or a digital domain multi-beam forming method, wherein, the base station carries out wireless communication with multiple users with the same time-frequency resource, and the communication process is implemented in the beam domain; each user uses a different time-frequency resource to transmit detection signals; the base station obtains the beam domain long-time channel information of each user according to the received detection signals, to determine users that can communicate with the same time-frequency resource and allocate an corresponding beam set for each user; each user communicates with the base station on the selected beam set, wherein, the beam sets occupied by the users communicating with the same time-frequency resource have no overlap among them; pilot frequency signals from different users don't have to be orthogonal to each other, and the pilot frequency can be reused among the space division users.

Abstract translation: 本发明提供一种利用大型天线阵列的无线通信方法。 该方法包括：在基站侧部署大型天线阵列，其中天线阵列可以是一维或二维阵列，并且可以在由基站覆盖的区域上形成数十个波束覆盖; 利用模拟多波束形成网络或数字域多波束形成方法在基站侧实现空域资源的波束域划分，其中基站与具有相同时频资源的多个用户进行无线通信， 并且通信过程在波束域中实现; 每个用户使用不同的时频资源来发送检测信号; 基站根据接收到的检测信号获取每个用户的波束长时间信道信息，以确定可以与相同时间频率资源通信的用户，并为每个用户分配相应的波束组; 每个用户在所选择的波束组上与基站进行通信，其中，与相同的时间 - 频率资源通信的用户占用的波束组在它们之间没有重叠; 来自不同用户的导频信号不必彼此正交，导频可以在空分用户之间重用。

公开(公告)号：US10271222B2

公开(公告)日：2019-04-23

申请号：US15506750

申请日：2014-08-28

Applicant: Southeast University

Inventor： Xiqi Gao ,  Xin Meng ,  Wen Zhong

IPC: H04B7/06 ,  H04W16/28 ,  H04L1/00 ,  H04B7/0413 ,  H04L1/06 ,  H04B7/0408 ,  H04B7/0456 ,  H04L25/03 ,  H04B7/0452

Abstract: Described herein is an omni-directional transmission scheme allowing signals to transmit from a base station to multiple users in massive MIMO systems with reduced pilot overhead and system complexity. The transmission scheme uses a low-dimensional space-time coding scheme to generate a K-dimensional vector signal, and based on the K-dimensional vector signal, using an omni-directional precoding matrix W to generate an M-dimensional vector signal for transmission over a large number of transmitting antennas, wherein the matrix W comprises M rows and K columns, and K is much smaller than M.