公开(公告)号：US10135508B2

公开(公告)日：2018-11-20

申请号：US14881782

申请日：2015-10-13

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seok Ho Won ,  Suchang Chae ,  Seyoung Cho ,  Il Gyu Kim ,  Seung Chan Bang

IPC: H04B7/06 ,  H04B7/0413

Abstract: Provided is a method for generating, by a base station, a common signal commonly required for surrounding terminals of the base station in a massive multiple input multiple output (MIMO) system. The base station generates data commonly required for the surrounding terminals. The base station generates a plurality of beamforming vectors using a time-domain constant amplitude (TCA)-frequency-domain constant amplitude (FCA) sequence having a constant size in a time domain and a frequency domain. Further, the base station generates a plurality of antenna streams corresponding to the common signal by multiplying the plurality of beamforming vectors by the data.

公开(公告)号：US09806778B2

公开(公告)日：2017-10-31

申请号：US14937960

申请日：2015-11-11

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seok Ho Won ,  Seyoung Cho ,  Suchang Chae ,  Il Gyu Kim ,  Seung Chan Bang

IPC: H04L27/00 ,  H01Q3/00 ,  H04B7/04 ,  H04B7/0417 ,  H04B7/06

CPC classification number: H04B7/046 ,  H04B7/0417 ,  H04B7/0669

Abstract: A transmitter generates a first precoding vector for a first virtual antenna port among a plurality of virtual antenna ports using a first sequence having a constant magnitude and a discrete Fourier transform (DFT) vector sequence in a time domain and a frequency domain. The transmitter generates a plurality of second precoding vectors for the remaining virtual antenna port, except for the first virtual antenna port of the plurality of virtual antenna ports by circular shifting the first precoding vector. The transmitter maps a plurality of first data streams for the plurality of virtual antenna ports to a plurality of physical antenna ports using the first precoding vector and the plurality of second precoding vectors.