发明授权
- 专利标题: Paging system with multiple baseband subcarriers
- 专利标题(中): 具有多个基带副载波的寻呼系统
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申请号: US511168申请日: 1995-08-04
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公开(公告)号: US5757782A公开(公告)日: 1998-05-26
- 发明人: Garold B. Gaskill
- 申请人: Garold B. Gaskill
- 申请人地址: OR Beaverton
- 专利权人: Seiko Communications Systems, Inc.
- 当前专利权人: Seiko Communications Systems, Inc.
- 当前专利权人地址: OR Beaverton
- 主分类号: H04L1/18
- IPC分类号: H04L1/18 ; H04W88/02 ; H04Q7/08
摘要:
Pager data is transmitted at different subcarrier frequencies on different FM broadcast channels. The subcarrier frequency of the pager data is selected to avoid conflicts with signals transmitted from other systems. The pager receiver decodes data at any one of the multiple subcarrier frequencies according to the active subcarrier used on the currently tuned broadcast channel. In one embodiment, the subcarrier frequency of the pager data is contained in control packets of a time division multiplexed data frame. The receiver decodes the control packets to determine which broadcast frequencies and associated subcarrier frequencies contain potential pager signals. The receiver accordingly searches the identified broadcast frequency and automatically reconfigures a circuit demodulator to decode data packets at the identified subcarrier frequencies.
公开/授权文献
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