The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 2019
Filed:
Mar. 21, 2018
Applicant:
Mediatek Inc., Hsinchu, TW;
Inventors:
Assignee:
MEDIATEK INC., HsinChu, TW;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04B 7/0456 (2017.01); H04W 72/12 (2009.01); H04W 72/04 (2009.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01);
U.S. Cl.
CPC ...
H04B 7/0456 (2013.01); H04B 7/0473 (2013.01); H04B 7/0697 (2013.01); H04L 5/0048 (2013.01); H04W 72/042 (2013.01); H04W 72/1231 (2013.01); H04W 72/1289 (2013.01);
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.