发明授权
US6084931A Symbol synchronizer based on eye pattern characteristics having variable
adaptation rate and adjustable jitter control, and method therefor
失效
基于具有可变自适应速率和可调节抖动控制的眼图特征的符号同步器及其方法
- 专利标题: Symbol synchronizer based on eye pattern characteristics having variable adaptation rate and adjustable jitter control, and method therefor
- 专利标题(中): 基于具有可变自适应速率和可调节抖动控制的眼图特征的符号同步器及其方法
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申请号: US962267申请日: 1997-10-31
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公开(公告)号: US6084931A公开(公告)日: 2000-07-04
- 发明人: Clinton C. Powell, II , James M. Keba , James R. Webster
- 申请人: Clinton C. Powell, II , James M. Keba , James R. Webster
- 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 ; H04L7/00
摘要:
A symbol synchronizer (10) for use in a communication device. The symbol synchronizer (10) comprises a sampling circuit (100) which samples the demodulated signal at a plurality of sampling events for each symbol period to generate three sample values at each sampling event. An eye pattern detector circuit (200) generates eye pattern characteristic information based on the three sample values, and outputs a symbol pulse in response to detecting eye pattern characteristic information consistent with a symbol center. A synchronization noise mask circuit (400) filters symbol pulses that occur during a predetermined period of time after a first symbol pulse is detected for each symbol period. A synchronization adjust circuit (500) generates a synchronization pulse during each symbol period at a particular instant of time during the symbol period based on a history of the occurrences of symbol pulses for a current symbol period and for prior symbol periods.
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