Procedure for seizing the beginning of an active signal section

Details Procedure for seizing the beginning of an active signal section Procedure for seizing the beginning of an active signal section

2007-10-16

2007-10-16

Tse, Young T. (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

10676559

ABSTRACT:
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 (S102, S103) by forming a cost function L(v0) 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 v0characterized by reference signal p(v), whereby the addends of the correlation function were multiplied with a frequency offset correction factor, namely e−j2πΔ{tilde over (f)}v, which factor was characterized with a frequency offset Δf of received signal r(v) relative to the reference signal p(v); and (b) seeking a maximum Max(L) of cost function L(v0) dependent upon the bit offset or the chip offset v0and upon the approximate frequency offset Δ{tilde over (f)} whereby maximum Max(L), following a discrete Fourier Transform (FFT) is sought in the frequency space.

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