发明授权
US5960042A Method in a selective call receiver for synchronizing to a multi-level
radio signal
失效
用于同步到多电平无线电信号的选呼接收机中的方法
- 专利标题: Method in a selective call receiver for synchronizing to a multi-level radio signal
- 专利标题(中): 用于同步到多电平无线电信号的选呼接收机中的方法
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申请号: US886356申请日: 1997-07-01
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公开(公告)号: US5960042A公开(公告)日: 1999-09-28
- 发明人: Chun-Ye Susan Chang , Clinton C. Powell, II , James Michael Keba , Stephen R. Carsello
- 申请人: Chun-Ye Susan Chang , Clinton C. Powell, II , James Michael Keba , Stephen R. Carsello
- 申请人地址: IL Schaumburg
- 专利权人: Motorola, Inc.
- 当前专利权人: Motorola, Inc.
- 当前专利权人地址: IL Schaumburg
- 主分类号: H04L7/033
- IPC分类号: H04L7/033 ; H04L27/152 ; H04L25/49
摘要:
A selective call receiver (800), including a receiver circuit (101) and a processor (810), is used for synchronizing an internal reference to symbol edges of a plurality of symbols in a multi-level radio signal transmitted by a radio communication system. To perform this function the processor (810) is adapted to cause the receiver circuit (101) to demodulate the multilevel radio signal to in-phase and quadrature signals (108, 106), convert the in-phase and quadrature signals (108, 106) to a sequence of state transitions representative of the plurality of symbols, detect at least one same state transition from the sequence of state transitions, and synchronize the internal reference to the at least one symbol edge of the plurality of symbols based on the at least one same state transition.
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