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1. 发明授权

US06934524B2 Fine-stage automatic frequency compensation in post-detection short-range wireless applications 失效
标题翻译：检测后短距离无线应用中的微步自动频率补偿
公开(公告)号：US06934524B2
公开(公告)日：2005-08-23
申请号：US10131214
申请日：2002-04-25
申请人： Eric John Hansen , Wenzhe Luo , Zhigang Ma , Richard L. McDowell
发明人： Eric John Hansen , Wenzhe Luo , Zhigang Ma , Richard L. McDowell
IPC分类号： H04L12/56 , H04L27/00 , H04L27/16 , H04L27/233 , H04B1/26
CPC分类号： H04L27/2332 , H04L27/16 , H04L2027/0046 , H04L2027/0065 , H04W24/00 , H04W84/18
摘要： A data-pattern feedback mechanism is introduced into the peak detection process of an automatic frequency compensation system in a Gaussian Frequency Shift Keying (GFSK) modulated system, providing fast and accurate fine-stage automatic frequency compensation (AFC). Maximum positive and negative peak registers are updated with new values as necessary based on detection during a sequence of identical binary bit values (e.g., during a “00” for detection of maximum negative peak frequency, or during a “11” for detection of maximum positive peak frequency), in a particular data frame. As soon as an initial value is determined for both the maximum positive and negative peak frequencies (e.g., after the first occurrence of a “11” and a “00”, in any order), fine-stage automatic frequency compensation can be initiated. Subsequent adjustments to the VCO of the local oscillator will further refine the frequency offset towards the ideal of zero. Quick determination of the maximum positive and negative peak frequencies is made based on data pattern feedback in accordance with the principles of the present invention, allowing for a fast and accurate fine-stage automatic frequency compensation adjustment of a local oscillation clock signal.
摘要翻译：在高斯频移键控（GFSK）调制系统的自动频率补偿系统的峰值检测过程中引入了数据模式反馈机制，提供了快速准确的微步自动频率补偿（AFC）。最大正和负峰值寄存器根据相同的二进制位值序列之前的检测（例如，在用于检测最大负峰值频率的“00”期间或在用于检测最大负峰值频率的“11”期间的检测正峰值频率），在特定数据帧中。一旦确定了最大正峰值和负峰值频率的初始值（例如，在第一次出现“11”和“00”之后，以任何顺序），可以开始精细级自动频率补偿。对本地振荡器的VCO的后续调整将进一步细化朝向理想值零的频率偏移。基于根据本发明的原理的数据模式反馈来快速确定最大正峰值和负峰值频率，允许对本地振荡时钟信号进行快速和准确的精细级自动频率补偿调整。

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