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：US20150006991A1

公开(公告)日：2015-01-01

申请号：US14374690

申请日：2013-01-24

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seok Ho Won ,  Sun Hyoung Kwon ,  Ho Kyom Kim ,  Jong Soo Lim ,  O Hyung Kwon

IPC: H03M13/13 ,  G06F11/10 ,  H03M13/29

CPC classification number: G06F11/10 ,  H03M13/3761 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/007 ,  H04N21/2383

Abstract: Disclosed are a graceful degradation-forward error correction method and an apparatus for performing same. A graceful degradation-forward error correction method determines an encoding unit data group constituted by a predetermined number of time intervals for a data stream input in a time-sequential manner, determines a reference data group to be used in generating a parity frame in each time interval of the encoding unit data group, generates a parity frame using the determined at least one reference data group, and assigns the generated parity frame to at least one time interval from among a plurality of time intervals including time intervals constituting the encoding unit data group based on a predetermined rule. Thus, a lost packet can be recovered even when the packet of a continuous long interval is lost, and consequentially, a seamless service may be provided.

Abstract translation: 公开了一种优雅的退化前向纠错方法及其执行装置。 优雅的退化前向纠错方法确定以时间顺序方式输入的数据流的预定数量的时间间隔构成的编码单元数据组，确定在每次产生奇偶校验帧时使用的参考数据组 编码单元数据组的间隔，使用所确定的至少一个参考数据组生成奇偶校验帧，并且将生成的奇偶校验帧从包括构成编码单元数据组的时间间隔的多个时间间隔中的至少一个时间间隔分配 基于预定规则。 因此，即使当连续长间隔的分组丢失时，也可以恢复丢失的分组，并且因此可以提供无缝服务。

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.