Spectrum spreading signal demodulation method and apparatus

Details Spectrum spreading signal demodulation method and apparatus Spectrum spreading signal demodulation method and apparatus

2011-08-23

2011-08-23

Le, Brian Q (Department: 2624)

Image analysis

Image transformation or preprocessing

Fourier transform

C382S232000, C382S233000, C382S250000, C375S324000, C708S403000

Reexamination Certificate

active

08005315

ABSTRACT:
A spread spectrum signal demodulating method whereby spread-code synchronous acquisition and carrier synchronous acquisition are performed using FFT at high speed, wherein a received signal, of which the carrier wave is modulated with a signal obtained by spectrum-spreading data with a spread code, is subjected to the FFT and the result of the FFT is stored in a first memory. The FFT result of the received signal stored in the first memory and the result of FFT of the spread code stored in a second memory are read out and multiplied to detect the correlation between the received signal and the spread code. A readout address of either the FFT result of the received signal or the FFT result of the spread code is shifted by an amount corresponding to a carrier frequency of the received signal.

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