发明申请
- 专利标题: Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system
- 专利标题(中): 无线多载波通信系统中多个数据流的频分复用
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申请号: US10968614申请日: 2004-10-18
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公开(公告)号: US20050135308A1公开(公告)日: 2005-06-23
- 发明人: Rajiv Vijayan , Gordon Walker , Raghu Krishnamoorthi , Ramaswamy Murali
- 申请人: Rajiv Vijayan , Gordon Walker , Raghu Krishnamoorthi , Ramaswamy Murali
- 专利权人: QUALCOMM Incorporated
- 当前专利权人: QUALCOMM Incorporated
- 主分类号: H04L27/28
- IPC分类号: H04L27/28
摘要:
Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in an OFDM system are described. M disjoint “interlaces” are formed with U usable subbands. Each interlace is a different set of S subbands, where U=M·S. The subbands for each interlace are interlaced with the subbands for each of the other M−1 interlaces. M slots may be defined for each symbol period and assigned slot indices 1 through M. The slot indices may be mapped to interlaces such that (1) frequency diversity is achieved for each slot index and (2) the interlaces used for pilot transmission have varying distances to the interlaces used for each slot index, which improves channel estimation performance. Each data stream may be processed as data packets of a fixed size, and different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for the data packet.