发明申请
- 专利标题: Methods and apparatus of providing transmit diversity in a multiple access wireless communication system
- 专利标题(中): 在多址无线通信系统中提供发射分集的方法和装置
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申请号: US10763944申请日: 2004-01-23
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公开(公告)号: US20050003768A1公开(公告)日: 2005-01-06
- 发明人: Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan
- 申请人: Rajiv Laroia , Junyi Li , Sundeep Rangan , Murari Srinivasan
- 主分类号: H04W88/18
- IPC分类号: H04W88/18 ; H04B7/06 ; H03C7/02
摘要:
Methods and apparatus for providing channel diversity to wireless terminals (WTs) in a manner that reduces the latency between the time a WT encounters satisfactory channel conditions are described. A plurality of communications channels with different physical characteristics are maintained in a cell by a base station (BS). Each WT monitors multiple channels and maintains multiple channel estimates at the same time so that rapid switching between channels is possible. Channel quality information is conveyed from each WT to the BS. The WT or BS selects a channel based on the measured channel quality. By supporting multiple channels and by introducing periodic variations into the channels in various embodiments, the time before a WT encounters a channel with good or acceptable channel conditions is minimized even if the WT does not change location. Multiple antennas are used at the BS to support numerous channels simultaneously, e.g., by controlling antenna patterns.
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