公开(公告)号：US10367553B2

公开(公告)日：2019-07-30

申请号：US15927216

申请日：2018-03-21

Applicant: MEDIATEK INC.

Inventor： Chiao Yao Chuang ,  Song Jheng Lin ,  Yih-Shen Chen

IPC: H04B7/0456 ,  H04W72/12 ,  H04W72/04 ,  H04B7/06 ,  H04L5/00

Abstract: A method of two-layer (Rank=2) demodulation reference signal (DMRS) based transmission scheme is proposed. The precoding matrix on a data RE can be represented as A×B. The precoding matrix on the UE-specific reference signal DMRS is A. Matrix B is the co-phasing cycling matrix. By applying the proposed co-phasing cycling matrix B for Rank=2 DMRS-based transmission scheme, the ratio of PDSCH EPRE to DMRS EPRE is equal to 0 dB, as required by the LTE specification. Further, when the DMRS power follows the precoding matrix A, UE channel estimation performance is improved.

公开(公告)号：US20180279352A1

公开(公告)日：2018-09-27

申请号：US15927216

申请日：2018-03-21

Applicant: MEDIATEK INC.

Inventor： Chiao Yao Chuang ,  Song Jheng Lin ,  Yih-Shen Chen

IPC: H04W72/12 ,  H04W72/04 ,  H04L5/00 ,  H04B7/04 ,  H04B7/06

CPC classification number: H04B7/0456 ,  H04B7/0473 ,  H04B7/0697 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0051 ,  H04L5/0053 ,  H04W72/042 ,  H04W72/1231 ,  H04W72/1289

Abstract: A method of two-layer (Rank=2) demodulation reference signal (DMRS) based transmission scheme is proposed. The precoding matrix on a data RE can be represented as A×B. The precoding matrix on the UE-specific reference signal DMRS is A. Matrix B is the co-phasing cycling matrix. By applying the proposed co-phasing cycling matrix B for Rank=2 DMRS-based transmission scheme, the ratio of PDSCH EPRE to DMRS EPRE is equal to OdB, as required by the LTE specification. Further, when the DMRS power follows the precoding matrix A, UE channel estimation performance is improved.