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:
Dec. 17, 2013
Filed:
Jul. 26, 2011
Applicant:
Long Gao, Santa Clara, CA (US);
Inventor:
Long Gao, Santa Clara, CA (US);
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04W 72/00 (2009.01);
U.S. Cl.
CPC ...
Abstract
In a distributed antenna system (DAS), the number of physical antennas is usually larger than that of the antenna ports supported by LTE/LTE-A RS pattern in each cell. Systems and methods are directed to a RS transmission scheme in which the RRHs (or RRH groups) are dynamically scheduled and mapped to the antenna ports for RS transmission based on user density distribution such that the accuracy of the channel state information (CSI) estimation in the DAS is optimized.