公开(公告)号：US20190013983A1

公开(公告)日：2019-01-10

申请号：US15744909

申请日：2016-10-31

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi GAO ,  Li YOU ,  Wenjin WANG

IPC: H04L27/26 ,  H04L5/00 ,  H04B7/01 ,  H04B7/06 ,  H04B7/0408 ,  H04B7/0413

CPC classification number: H04L27/2655 ,  H04B7/01 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0617 ,  H04L5/0048 ,  H04W56/005

Abstract: Signal transmitting/receiving electronic devices or terminals in the present disclosure are configured to conduct per-beam signal synchronization in massive MIMO communication with a signal receiving/transmitting device or base station. During the massive MIMO communication, the devices or terminals are configured to transmit/receive signals via a set of beams to or from the signal receiving/transmitting device or base station. For beam domain signal of each individual beam of the plurality beams, the devices or terminals are configured to determine target time adjustments based on time shifts of the beam domain signals induced by multipath effect and target frequency adjustments based on frequency offsets of the beam domain signals induced by the Doppler effect; adjust time independent variables of the beam domain signals by the time adjustments; and adjust frequency independent variables of the beam domain signals by the frequency adjustments. Further, per-beam synchronized BDMA massive MIMO transmission method is disclosed, which provides a solution to efficient and reliable wireless communications with high mobility and/or high carrier frequency.

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：US20240243778A1

公开(公告)日：2024-07-18

申请号：US17925505

申请日：2022-02-21

Applicant: SOUTHEAST UNIVERSITY

Inventor： Li YOU ,  Jie XU ,  Mengyu QIAN ,  Kelin HUANG ,  Yuqi YE ,  Wenjin WANG

IPC: H04B7/04 ,  H01Q15/00 ,  H04B7/0413

CPC classification number: H04B7/04013 ,  H01Q15/0086 ,  H04B7/0413

Abstract: The present invention discloses a near-field broadband uplink MIMO transmission method assisted by a dynamic metasurface antenna. The method includes: Broadband signals sent by a plurality of users distributed in a near-field region are processed with a large-size dynamic metasurface antenna as a receive antenna on a base station side, which can reduce system hardware costs and power consumption; and compared with the current hybrid beamforming based on a phase shifter and a conventional antenna, hybrid beamforming based on the dynamic metasurface antenna can effectively improve transmission performance. The present invention proposes an algorithm framework jointly designing a dynamic metasurface antenna and a baseband beamformer and including method such as matrix-weighted mean square error sum (MWMSE) minimization, alternate optimization, matrix vectorization, and MM. The present invention implements near-field broadband large-scale MIMO uplink transmission assisted by a dynamic metasurface antenna with low algorithm complexity and good convergence.

公开(公告)号：US20240195462A1

公开(公告)日：2024-06-13

申请号：US17786380

申请日：2021-10-12

Applicant: Southeast University

Inventor： Li YOU ,  Xiaoyu QIANG ,  Yuqi YE ,  Yan HUANG ,  Wenjin WANG ,  Xiqi GAO

IPC: H04B7/0456 ,  H04B7/185

CPC classification number: H04B7/0456 ,  H04B7/18513

Abstract: Disclosed is a transmit method based on satellite massive Multiple-Input Multiple-Output (MIMO) integrated sensing and communication, where a satellite end is equipped with a massive MIMO array to implement an integrated sensing and communication system. The satellite end sends a communication signal to multiple user terminals based on statistical properties of electromagnetic wave propagation, and detects multiple targets simultaneously, thus realizing simultaneous communication of the satellite end with the user terminals and sensing for the targets. The present disclosure fully utilizes the spectrum resources, implements a flexible switch between wireless communication and target sensing functions based on a satellite, and mitigates the effects of the beam squint on system performance, thus greatly improving communication performance and radar resolution and being applicable for construction of an integrated network of space, air, ground and sea to achieve global coverage.

公开(公告)号：US20210368455A1

公开(公告)日：2021-11-25

申请号：US17256656

申请日：2020-02-20

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi GAO ,  Li YOU ,  Xu CHEN ,  Yufei HUANG ,  Xueyuan SHI ,  Siran HE ,  Wenjin WANG

IPC: H04W52/42 ,  H04B7/0452 ,  H04W72/04 ,  H04W56/00

Abstract: A large-scale MIMO (Multiple-Input Multiple-Output) wireless transmission method for millimeter wave/Terahertz networks is provided. In order to reduce the interruption of propagation in the millimeter wave/Terahertz band, a plurality of cells are combined into a wireless transmission network, the base station in each cell is equipped with a large-scale antenna array, and a unitary transformation matrix is used to achieve large-scale beam coverage for user terminals in the entire network. Moreover, in order to reduce the influence of the multipath and Doppler effects on transmission performance, received signals are synchronized for time and frequency in each receiving beam of a user terminal. The method allocates power for signal transmission according to the statistic information of synchronized equivalent channels, and gives an optimal power allocation matrix by iterative solution based on the CCCP (concave-convex procedure) and the deterministic equivalent method.

公开(公告)号：US20210288715A1

公开(公告)日：2021-09-16

申请号：US17268336

申请日：2019-10-10

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi GAO ,  Li YOU ,  Kexin LI ,  Jiaheng WANG ,  Wenjin WANG

IPC: H04B7/185 ,  H04B7/0408 ,  H04B7/0456 ,  H04W72/04

Abstract: The present invention discloses a large-scale MIMO satellite mobile communication method and system. A satellite or gateway station uses spatial angle information of user terminals to group the users to be served in the coverage area to form space division user groups, wherein the user terminals in the same group use the same time-frequency resources to communicate with the satellite, while the user terminals in different groups use different time-frequency resources to communicate with the satellite. For the user terminals in the same space division user group, the satellite or gateway station uses statistical channel information of each user terminal to calculate a downlink precoding vector and an uplink receiving processing vector corresponding to each user terminal, and then uses the obtained vectors to perform downlink precoding transmission and uplink received signal processing. The user terminal uses Doppler frequency shift resulted from the movement of the satellite and minimum propagation time delay of long-distance propagation to make compensation for the frequency and time of the signal received and sent by the user terminal. The present invention can greatly improve the spectrum efficiency and power efficiency of a satellite mobile communication system and reduce the implementation complexity of the satellite mobile communication system.

公开(公告)号：US20230327752A1

公开(公告)日：2023-10-12

申请号：US18025046

申请日：2021-09-22

Applicant: Southeast University

Inventor： Xintong LING ,  Pengcheng CHEN ,  Zheng GAO ,  Yuwei LE ,  Jiaheng WANG ,  Li YOU ,  Xiqi GAO

IPC: H04B7/185 ,  H04L9/00

CPC classification number: H04B7/18526 ,  H04L9/50

Abstract: The present invention discloses a satellite-based blockchain architecture, including a terrestrial blockchain miner network, a constellation system, and a consensus protocol coordinating the constellation system and the terrestrial blockchain miner network. In each round, a satellite generates an oracle, and satellites broadcast the oracle to the terrestrial blockchain miner network. The oracle selects a terrestrial miner as a winner of the current round based on a specific rule. The winning terrestrial miner has the right to generate a new block in the round, and broadcasts the new block to other miners by using the terrestrial blockchain miner network. Other miners receiving the new block check the validity of the block, and if the check succeeds, the block is broadcast to other miners by using the terrestrial blockchain miner network. The present invention significantly improves the efficiency and throughput of a blockchain, and optimizes and reduces the energy consumption of executing a consensus protocol by a terrestrial blockchain miner network.