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:
Jan. 27, 2015
Filed:
Apr. 21, 2011
Hidekazu Taoka, Tokyo, JP;
Katsutoshi Kusume, Tokyo, JP;
Hidekazu Taoka, Tokyo, JP;
Katsutoshi Kusume, Tokyo, JP;
NTT DOCOMO, INC., Tokyo, JP;
Abstract
The present invention reduces the increase of the amount of feedback information, and, regardless of whether the correlation between antennas is high or low, increases the data rate upon MIMO transmission. A feedback information transmission method to assume a Hermitian transpose of a precoding matrix corresponding to a PMI that is selected in accordance with the amount of channel variation as a channel matrix (effective channel: h) and transmit feedback information to use in MIMO transmission to a base station apparatus, includes selecting a PMI and an RI in accordance with the amount of channel variation and measuring a CQI for single-user MIMO transmission, calculating complementary information (for example, CQI difference information ΔCQI) to complement the difference between the CQI for single-user MIMO transmission and a CQI for multi-user MIMO transmission, and transmitting the PMI, RI, CQI for single-user MIMO transmission and complementary information to the base station apparatus as feedback information.