公开(公告)号：US11831393B2

公开(公告)日：2023-11-28

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

CPC classification number: H04B7/18513 ,  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：US11954681B2

公开(公告)日：2024-04-09

申请号：US17617577

申请日：2020-06-16

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xintong Ling ,  Yuwei Le ,  Bowen Zhang ,  Jiaheng Wang ,  Xiqi Gao

IPC: G06Q20/00 ,  G06Q20/38 ,  G06Q20/40 ,  H04L9/00 ,  H04W12/08 ,  H04W12/122

CPC classification number: G06Q20/401 ,  G06Q20/3825 ,  H04L9/50 ,  H04W12/08 ,  H04W12/122 ,  G06Q2220/00

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.