发明授权
- 专利标题: Searching for signals in a communications system
- 专利标题(中): 搜索通信系统中的信号
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申请号: US09678165申请日: 2000-10-02
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公开(公告)号: US07065130B1公开(公告)日: 2006-06-20
- 发明人: Roozbeh Atarius , Håkan Eriksson , Torgny Palenius , Christer Östberg , Torsten Carlsson , Kjell Gustafsson
- 申请人: Roozbeh Atarius , Håkan Eriksson , Torgny Palenius , Christer Östberg , Torsten Carlsson , Kjell Gustafsson
- 申请人地址: SE Stockholm
- 专利权人: Telefonaktiebolaget LM Ericsson (publ)
- 当前专利权人: Telefonaktiebolaget LM Ericsson (publ)
- 当前专利权人地址: SE Stockholm
- 主分类号: H04B15/00
- IPC分类号: H04B15/00 ; H04K1/00 ; H04L27/30
摘要:
A method and system enables matched filters of a CDMA system to be simplified using a two stage search. A course stage and a fine stage jointly produce the location(s) of received signal path-rays. In a first stage, an oversampled digital signal is decimated, and the decimated signal is applied to a matched filter to eventually produce an approximate location. In a second stage, the oversampled signal is shifted based on the determined approximate location and then correlated to a generated code, and a more-exact location is selected from the outputs of the correlations. Alternatively, a shifted version of the generated code is correlated to the oversampled signal, and the more-exact location is selected from the outputs of those correlations.
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