公开(公告)号：US20210226721A1

公开(公告)日：2021-07-22

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

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：US20180115912A1

公开(公告)日：2018-04-26

申请号：US15506750

申请日：2014-08-28

Applicant: Southeast University

Inventor： Xiqi GAO ,  Xin MENG ,  Wen ZHONG

IPC: H04W16/28 ,  H04B7/0456 ,  H04B7/06 ,  H04B7/0408 ,  H04L1/06

CPC classification number: H04W16/28 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0452 ,  H04B7/0456 ,  H04B7/0465 ,  H04B7/0617 ,  H04B7/0669 ,  H04L1/00 ,  H04L1/0042 ,  H04L1/0668 ,  H04L25/03898

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.