| 摘要 |
A process for detecting initiation (BB) of an active packet or burst in a digital received signal r(v) during use of a digital reference signal p(v) includes: (a) executing a correlation (S 102 , S 103 ) by forming a cost function L(v<SUB>0</SUB>) with a correlation function within a correlation function interval dependent upon a time delay of the received signal r(v) relative to a bit offset or a chip offset v<SUB>0 </SUB>characterized by reference signal p(v), whereby the addends of the correlation function were multiplied with a frequency offset correction factor, namely e<SUP>-j2piDeltafv</SUP>, which factor was characterized with a frequency offset Deltaf of received signal r(v) relative to the reference signal p(v); and (b) seeking a maximum Max(L) of cost function L(v<SUB>0</SUB>) dependent upon the bit offset or the chip offset v<SUB>0 </SUB>and upon the approximate frequency offset Deltaf whereby maximum Max(L), following a discrete Fourier Transform (FFT) is sought in the frequency space.
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