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:
Mar. 24, 2015
Filed:
Jul. 03, 2008
Farooq Khan, Allen, TX (US);
Zhouyue Pi, Richardson, TX (US);
Cornelius Van Rensburg, Dallas, TX (US);
Jianzhong Zhang, Irving, TX (US);
Farooq Khan, Allen, TX (US);
Zhouyue Pi, Richardson, TX (US);
Cornelius Van Rensburg, Dallas, TX (US);
Jianzhong Zhang, Irving, TX (US);
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
Methods and apparatus for efficiently feeding back preceding information in a multiple input multiple output (MIMO) system. A codebook including a plurality of codebook entries is constructed. A plurality of subsets of codebook entries are defined for the codebook. Each subset includes a plurality of codebook entries. A subset of codebook entries is selected for precoding data in dependence upon a channel condition, and a codebook entry is selected from the subset. Then, a subset index corresponding to the selected subset, and a codebook entry index corresponding to the selected codebook entry within the selected subset, is transmitted as feedback information.