Method and apparatus for determining an identifying bit sequence

Details Method and apparatus for determining an identifying bit sequence Method and apparatus for determining an identifying bit sequence

1997-08-20

2000-05-30

Vo, Don N.

Pulse or digital communications

Spread spectrum

Direct sequence

375343, H04B 1500, H04K 100, H04L 2730

Patent

active

060699132

ABSTRACT:
The characterization and detection of an identifying bit sequence is performed without digital demodulation or bit synchronization. A waveform containing a digital bit sequence is correlated with waveforms corresponding to a set of known bit sequences. For each bit sequence, one of the inputs to a correlator is shifted through all possible values of correlation lag while the correlation match for each lag value is compared to the others so that a peak correlation between the two waveforms is determined. The peak correlation values for each of the known bit sequences are then compared to characterize how closely the received radio frequency signal corresponds to each of the known bit sequences. The bit sequence that most closely corresponds to the waveform of the received signal may then be identified. Applications include the identification of the N-AMPS DSAT and the GSM training sequence in a cellular radio scanning receiver.

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