| 发明名称 |
Method and apparatus for a unique word differential detection and demodulation using the unique word differential detection |
| 摘要 |
A unique word (UW) differential detection system to provide a system that can expand a measurement range for the carrier frequency offset of the quasi-synchronized detection signal while maintaining detection of unique word position at a high accuracy, and maintaining a resolution for the carrier frequency at a low level. In an initial acquisition mode, the detection system uses a first UW differential detection circuit with a symbol delay N (0.5<N</=1) and a second differential detection circuit with a symbol delay N/2 to generate a first UW detection signal of a first quasi-synchronized detection signal and first frequency offset information. The first frequency offset information reduces frequency offset of a second quasi-synchronized detection signal for demodulating a data signal. Then, the mode turns to a fine tune acquisition mode, where a third UW differential detection circuit with a symbol delay M (1<M) operates to generate a second UW detection signal and a second UW detection signal as a verification check when the system detects a UW from a third quasi-synchronized detection signal.
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| 申请公布号 |
US6088411(A) |
申请公布日期 |
2000.07.11 |
| 申请号 |
US19970980290 |
申请日期 |
1997.11.28 |
| 申请人 |
NEC CORPORATION |
发明人 |
POWIERSKI, DARREN;IWASAKI, MOTOYA |
| 分类号 |
H04J3/06;H04L7/04;H04L7/08;H04L7/10;H04L27/22;H04L27/227;H04L27/26;(IPC1-7):H04L7/06 |
主分类号 |
H04J3/06 |
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