发明授权
- 专利标题: System for method for fine acquisition of a spread spectrum signal
- 专利标题(中): 用于精细采集扩频信号的方法系统
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申请号: US09737166申请日: 2000-12-14
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公开(公告)号: US06909736B2公开(公告)日: 2005-06-21
- 发明人: David Akopian , Harri Valio , Seppo Turunen
- 申请人: David Akopian , Harri Valio , Seppo Turunen
- 申请人地址: FI Espoo
- 专利权人: Nokia Corporation
- 当前专利权人: Nokia Corporation
- 当前专利权人地址: FI Espoo
- 代理机构: Ware, Fressola, Van Der Sluys & Adolphson LLP
- 主分类号: H04B1/7075
- IPC分类号: H04B1/7075 ; H04B15/00 ; H04K1/00 ; H04L27/30
摘要:
A method, corresponding apparatus, and corresponding system for acquiring a received spread spectrum signal, the received signal having a carrier component at a carrier frequency, a code component having a code period, and a data component, the acquiring including matching the phase of a replica of the code component to the phase of the received code component and also determining any shift in the carrier frequency away from a transmitted carrier frequency, the method including the steps of: performing a first acquisition of the received signal so as to provide an approximately estimated carrier frequency and a phase of the replica and also so as to provide a code-wiped and an approximately carrier-wiped signal; and performing a second acquisition of the approximately carrier-wiped signal, the second acquisition including a substep of data wipe-off involving a squaring or similar operation on a signal derived from the approximately carrier-wiped signal; thereby providing a correction to the approximately estimated carrier frequency, a correction that accounts for the carrier frequency shift remaining after the first acquisition. The invention also comprehends a method including only a single acquisition, an acquisition including a data wipe-off involving a squaring or similar operation on a signal having a data component and a frequency component, i.e. the invention is of use in acquiring any kind of signal having a carrier component and a data component, regardless of whether a first, typically relatively coarse acquisition is performed.
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