Patents by Inventor Xiqi Gao

Xiqi Gao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220376750
    Abstract: The present disclosure relates to a skywave large-scale MIMO communication method, model, and system. A skywave communication base station in a short waveband is constructed using a large-scale antenna array, wherein skywave large-scale MIMO communication is carried out between the skywave communication base station and a user terminal in a coverage area by ionospheric reflection. The skywave communication base station determines a spacing of the large-scale antenna array according to a maximum operating frequency, and communicates with the user terminal based on a TDD communication mode, wherein a skywave large-scale MIMO signal is transmitted based on an OFDM modulation mode or a power efficiency improvement modulation mode. The skywave communication base station selects a communication carrier frequency within a short waveband range according to a real-time ionospheric channel characteristic, and adaptively selects an OFDM modulation parameter and a signal frame structure.
    Type: Application
    Filed: December 21, 2020
    Publication date: November 24, 2022
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xiqi GAO, Xianglong YU, Anan LU
  • Publication number: 20220263554
    Abstract: The present invention discloses a massive multiple-input multiple-output (MIMO) beam domain robust precoding transmission method and system. The method is based on base station (BS)-side and user-side refined sampling steering vector matrices, and considers the influence of channel aging caused by mobility, where obtained channel state information is refined beam domain a posteriori statistical channel information including channel mean and variance information.
    Type: Application
    Filed: April 22, 2020
    Publication date: August 18, 2022
    Inventors: Xiqi GAO, Anan LU
  • Patent number: 11419068
    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.
    Type: Grant
    Filed: February 20, 2020
    Date of Patent: August 16, 2022
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Li You, Xu Chen, Yufei Huang, Xueyuan Shi, Siran He, Wenjin Wang
  • Publication number: 20220245634
    Abstract: A blockchain-enhanced open Internet of Things (IoT) access architecture includes an access point, a number of IoT devices, a hash access mechanism, a blockchain mining network, and a blockchain enabling mechanism that manages network access of the IoT device. The blockchain-enhanced open IoT access architecture provided in the present invention provides a secure, reliable, fair, and short-packet access service for a plurality of devices in an IoT network by using features of a blockchain such as distributed storage, tamper-proofing, and traceability, thereby promoting the trust and cooperation between the devices and ensuring the security and efficiency of the network in the large-scale untrustworthy IoT network. The blockchain-enhanced open IoT access architecture in the present invention can provide secure and reliable IoT access with low latency and a high value in practice.
    Type: Application
    Filed: June 16, 2020
    Publication date: August 4, 2022
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xintong LING, Yuwei LE, Bowen ZHANG, Jiaheng WANG, Xiqi GAO
  • Publication number: 20210368455
    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.
    Type: Application
    Filed: February 20, 2020
    Publication date: November 25, 2021
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xiqi GAO, Li YOU, Xu CHEN, Yufei HUANG, Xueyuan SHI, Siran HE, Wenjin WANG
  • Patent number: 11177863
    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.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: November 16, 2021
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Anan Lu, Wen Zhong
  • Patent number: 11139908
    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.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: October 5, 2021
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Chen Sun, Wenjin Wang, Li You, Anan Lu, Wen Zhong
  • Publication number: 20210288715
    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.
    Type: Application
    Filed: October 10, 2019
    Publication date: September 16, 2021
    Inventors: Xiqi GAO, Li YOU, Kexin LI, Jiaheng WANG, Wenjin WANG
  • Publication number: 20210226721
    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.
    Type: Application
    Filed: September 22, 2017
    Publication date: July 22, 2021
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xiqi GAO, Chen SUN, Wenjin WANG, Li YOU, Anan LU, Wen ZHONG
  • Patent number: 10998968
    Abstract: An EnodeB or a transmitting device intermittently generates synchronization signals, and then performs perfect omnidirectional pre-coding processing on the synchronization signals; the synchronization signals after perfect omnidirectional pre-coding processing pass through a transmission channel and are then received by a mobile terminal or a receiving device, and the mobile terminal or the receiving device uses the received synchronization signals and local replicas of the synchronization signals for receiving and synchronization processing. An EnodeB or a transmitting device generates vector signals via low-dimensional space-time coding, and then performs perfect omnidirectional pre-coding processing on the vector signals; the transmitted signals after perfect omnidirectional pre-coding processing pass through a transmission channel and are then received by a mobile terminal or a receiving device, and the mobile terminal or the receiving device uses the received signals for signal receiving processing.
    Type: Grant
    Filed: July 4, 2016
    Date of Patent: May 4, 2021
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Xin Meng
  • Publication number: 20200274613
    Abstract: An EnodeB or a transmitting device intermittently generates synchronization signals, and then performs perfect omnidirectional pre-coding processing on the synchronization signals; the synchronization signals after perfect omnidirectional pre-coding processing pass through a transmission channel and are then received by a mobile terminal or a receiving device, and the mobile terminal or the receiving device uses the received synchronization signals and local replicas of the synchronization signals for receiving and synchronization processing. An EnodeB or a transmitting device generates vector signals via low-dimensional space-time coding, and then performs perfect omnidirectional pre-coding processing on the vector signals; the transmitted signals after perfect omnidirectional pre-coding processing pass through a transmission channel and are then received by a mobile terminal or a receiving device, and the mobile terminal or the receiving device uses the received signals for signal receiving processing.
    Type: Application
    Filed: July 4, 2016
    Publication date: August 27, 2020
    Inventors: Xiqi GAO, Xin MENG
  • Publication number: 20200204226
    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.
    Type: Application
    Filed: October 16, 2017
    Publication date: June 25, 2020
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xiqi GAO, Anan LU, Wen ZHONG
  • Patent number: 10541850
    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.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: January 21, 2020
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Li You, Wenjin Wang
  • Patent number: 10271222
    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.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: April 23, 2019
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Xin Meng, Wen Zhong
  • Publication number: 20190013983
    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.
    Type: Application
    Filed: October 31, 2016
    Publication date: January 10, 2019
    Applicant: SOUTHEAST UNIVERSITY
    Inventors: Xiqi GAO, Li YOU, Wenjin WANG
  • Publication number: 20180115912
    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.
    Type: Application
    Filed: August 28, 2014
    Publication date: April 26, 2018
    Applicant: Southeast University
    Inventors: Xiqi GAO, Xin MENG, Wen ZHONG
  • Patent number: 9609607
    Abstract: Disclosed is a main synchronization sequence design method for global covering multi-beam satellite LTE, comprising the follow steps: extending a standard Zadoff-Chu sequence to a generalized Zadoff-Chu sequence so as to obtain an initial candidate main synchronization sequence set of more candidate sequences; gradually narrowing down the candidate main synchronization sequence set according to a selection standard of a main synchronization sequence to obtain a final candidate main synchronization sequence set; and obtaining a main synchronization sequence set with optimal eclectic performance and complexity from the final candidate main synchronization sequence set. According to the present invention, a main synchronization sequence with optimal eclectic performance and calculation complexity can be designed for a global covering same-frequency networking multi-beam satellite LTE system.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: March 28, 2017
    Assignee: Southeast University
    Inventors: Haiming Wang, Zhuming Deng, Xiqi Gao, Xiaohu You
  • Patent number: 9462599
    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.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: October 4, 2016
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Xiqi Gao, Chen Sun, Shi Jin, Bin Jiang, Wen Zhong, Dongming Wang, Teer Ba
  • Publication number: 20160112973
    Abstract: Disclosed is a main synchronization sequence design method for global covering multi-beam satellite LTE, comprising the follow steps: extending a standard Zadoff-Chu sequence to a generalized Zadoff-Chu sequence so as to obtain an initial candidate main synchronization sequence set of more candidate sequences; gradually narrowing down the candidate main synchronization sequence set according to a selection standard of a main synchronization sequence to obtain a final candidate main synchronization sequence set; and obtaining a main synchronization sequence set with optimal eclectic performance and complexity from the final candidate main synchronization sequence set. According to the present invention, a main synchronization sequence with optimal eclectic performance and calculation complexity can be designed for a global covering same-frequency networking multi-beam satellite LTE system.
    Type: Application
    Filed: June 20, 2013
    Publication date: April 21, 2016
    Applicant: Southeast University
    Inventors: Haiming Wang, Zhuming Deng, Xiqi Gao, Xiaohu You
  • Publication number: 20150334726
    Abstract: The present invention provides a wireless communication method that utilizes large-scale antenna array.
    Type: Application
    Filed: April 19, 2013
    Publication date: November 19, 2015
    Inventors: Xiqi Gao, Chen Sun, Shi Jin, Bin Jiang, Wen Zhong, Dongming Wang, Teer Ba