-
公开(公告)号:US20090080549A1
公开(公告)日:2009-03-26
申请号:US12216422
申请日:2008-07-03
IPC分类号: H04K1/10
CPC分类号: H04L25/03343 , H04B7/0417 , H04B7/0478 , H04L5/0007 , H04L5/0053 , H04L5/006 , H04L25/0204 , H04L25/0228 , H04L2025/03414 , H04L2025/03426
摘要: 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.
摘要翻译: 用于在多输入多输出(MIMO)系统中有效地反馈先前信息的方法和装置。 构造包括多个码本条目的码本。 为码本定义了多个码本条目子集。 每个子集包括多个码本条目。 根据信道条件选择码本条目的子集用于预编码数据,并从子集中选择码本条目。 然后,作为反馈信息发送对应于所选择的子集的子集索引以及与所选择的子集内的所选码本条目相对应的码本条目索引。