Method and device for determining the occupancy of a...

Details Method and device for determining the occupancy of a... Method and device for determining the occupancy of a...

2006-06-07

2009-12-15

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S140000, C375S142000, C375S147000, C375S343000

Reexamination Certificate

active

07633996

ABSTRACT:
A method for determining the occupancy of a transmission channel using a differentially demodulated signal generated at a transmitter-side with the use of PN sequences from a PN sequence set having a first group of first PN sequences and a second group of second PN sequences. The method provides a) at least two subsequences of an initial code sequence, which is assigned to one of the first PN sequences and can be derived from the sequence by logical operations, but is not identical to it, b) the calculation of at least two correlation results by correlating the differentially demodulated signal with each of the at least two subsequences, and c) the evaluation of the correlation results and generation of an output signal to indicate the occupancy of the transmission channel. Also a device for determining the occupancy of a transmission channel.

REFERENCES:
patent: 5960030 (1999-09-01), Maruyama
patent: 2005/0036573 (2005-02-01), Zhang et al.

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