发明名称 |
Null-pilot symbol assisted fast automatic frequency control (AFC) system for coherent demodulation of continuous phase modulation (CPM) signals and method for implementing same |
摘要 |
A null-pilot symbol assisted fast automatic frequency control (AFC) system for coherent demodulation of carrier phase modulation (CPM) includes (209) a pilot clock driven phase differentiator (252,253,255) for operating once every pilot clock cycle to determine the difference between the phase at a current pilot symbol location and the phase at a previous pilot symbol location. A frequency offset selector (256) is then used for choosing the most likely frequency offset from amongst a set of all frequency offsets that give rise to the same phase difference.
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申请公布号 |
US6625237(B2) |
申请公布日期 |
2003.09.23 |
申请号 |
US20010919553 |
申请日期 |
2001.07.31 |
申请人 |
MOTOROLA, INC. |
发明人 |
TALWALKAR SUMIT ANIL;SOBCHAK CHARLES LEROY;OOI LENG H. |
分类号 |
H04L27/00;H04L27/227;(IPC1-7):H04L27/06 |
主分类号 |
H04L27/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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