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.

公开(公告)号：US20200274613A1

公开(公告)日：2020-08-27

申请号：US16066051

申请日：2016-07-04

Applicant: SOUTHEAST UNIVERSITY

Inventor： Xiqi GAO ,  Xin MENG

IPC: H04B7/26 ,  H04B7/0456 ,  H04B7/0426 ,  H04B7/155

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.