公开(公告)号：US20160013845A1

公开(公告)日：2016-01-14

申请号：US14863156

申请日：2015-09-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： EKO ONGGOSANUSI ,  RUNHUA CHEN ,  RALF BENDLIN

IPC: H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0456 ,  H04B7/0417 ,  H04B7/046 ,  H04B7/0469 ,  H04B7/0478 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/0639

Abstract: Channel state information (CSI) feedback in a wireless communication system is disclosed. A precoding matrix is generated for multi-antenna transmission based on precoding matrix indicator (PMI) feedback, wherein the PMI indicates a choice of precoding matrix derived from a matrix multiplication of two matrices from a first codebook and a second codebook. In one embodiment, the first codebook comprises at least a first precoding matrix constructed with a first group of adjacent Discrete-Fourier-Transform (DFT) vectors. In another embodiment, the first codebook comprises at least a second precoding matrix constructed with a second group of uniformly distributed non-adjacent DFT vectors. In yet another embodiment, the first codebook comprises at least a first precoding matrix and a second precoding matrix, where said first precoding matrix is constructed with a first group of adjacent DFT vectors, and said second precoding matrix is constructed with a second group of uniformly distributed non-adjacent DFT vectors.

公开(公告)号：US20150146676A1

公开(公告)日：2015-05-28

申请号：US14613176

申请日：2015-02-03

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： EKO ONGGOSANUSI ,  VIKRAM CHANDRASEKHAR ,  RUNHUA CHEN

IPC: H04B7/04 ,  H04W72/12

CPC classification number: H04B7/0469 ,  H04B7/024 ,  H04B7/0413 ,  H04B7/0452 ,  H04B7/0665 ,  H04B7/0691 ,  H04B7/10 ,  H04W72/1294

Abstract: A base station selects a subset of at least one geographically separated antennas for each of the plurality of user equipments. The base station forms at least layer of data stream including modulated symbols, precedes the data stream via multiplication with the NT by preceding matrix where N is the number of said layers and NT is the number of transmit antenna elements and transmits the precoded layers of data stream to the user equipment via the selected geographically separated antennas. The base station signals the subset of the plurality of geographically separated antennas via higher layer Radio Resource Control or via, a down link grant mechanism. The base station optionally does not signal the subset of the plurality of geographically separated antennas to the corresponding mobile user equipment.

Abstract translation: 基站为多个用户设备中的每一个选择至少一个地理上分离的天线的子集。 基站至少形成包括已调制符号的数据流层，先于数据流，并通过先前的矩阵与NT进行乘法，其中N是所述层的数量，NT是发射天线单元的数量，并传送预编码的数据层 通过所选择的地理上分离的天线到用户设备。 基站通过较高层无线电资源控制或通过下行链路授权机制向多个地理上分离的天线的子集发信号。 基站可选地不向相应的移动用户设备发送多个地理上分离的天线的子集。