Method and apparatus for detecting spreading-code...

Details Method and apparatus for detecting spreading-code... Method and apparatus for detecting spreading-code...

2011-01-25

2011-01-25

Payne, David C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

07876811

ABSTRACT:
A spreading-code synchronization detection method for a spectrum spreading signal that increases the sensitivity of spreading-code synchronization detection and in which a spreading-code synchronization detection is applied to a spectrum spreading signal obtained by spectrum-spreading data, having a bit transition period equal to a multiple of one period of a spreading code, with the spreading code. A process for obtaining a linear-addition correlation-calculation result equal to a value obtained by linear additions of the results of correlation calculations between the spectrum spreading signal and the spreading code is performed every unit period, which is a multiple of one period of the spreading code and shorter than the bit transition-period. The absolute value of the linear-addition correlation-calculation result obtained every unit period is calculated. The absolute value of the linear-addition correlation-calculation result obtained every unit period is added for a plurality of unit periods. A correlation point is detected from a value obtained by adding the absolute values.

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