- 专利标题: Macro-network location determination, local-oscillator stabilization, and frame-start synchronization based on nearby FM radio signals
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申请号: US13935225申请日: 2013-07-03
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公开(公告)号: US09247514B2公开(公告)日: 2016-01-26
- 发明人: Walter Rausch , Durga Prasad Satapathy
- 申请人: Clearwire IP Holdings LLC
- 申请人地址: US WA Bellevue
- 专利权人: Clearwire IP Holdings LLC
- 当前专利权人: Clearwire IP Holdings LLC
- 当前专利权人地址: US WA Bellevue
- 主分类号: H04W56/00
- IPC分类号: H04W56/00 ; G01S5/02 ; G01S5/08 ; H04W88/08
摘要:
Exemplary methods and systems may generally be implemented to allow a macro-network base station without access to a GPS reference signal to provide some or all of the functionality for which existing macro-network base stations typically rely on GPS. In a first aspect, an exemplary macro-network base station may determine its location using a location-determination technique that is based upon the angles of arrival of FM radio signals from nearby FM stations. In a second aspect, an exemplary macro-network base station may stabilize its local oscillator by phase-locking its local oscillator to an FM radio signal, and periodically adjusting its local oscillator to account for phase drift of the FM radio signal. And in a third aspect, an exemplary macro-network base station may synchronize its frame-start timing with a nearby base station using a frame-start timing signal that the base station has synchronized to frame transmissions from the nearby base station during a setup routine.