H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/67
H04B 1/66 (2006.01) H04B 1/707 (2006.01)
Patent
CA 1260141
ABSTRACT OF THE DISCLOSURE A decoder for spectrum diffusion signals is capable of reproducing data from received a spectrum deffusion signal, such as sattellite communication signals without performing PN synchronization. The decoder comprises a correlation detecting means comprising a matched filter which produces a back-diffusion signal when a received spectrum diffusion signal correlates with a Gold code for a specific channel of a station, an extraction signal generator means for detecting the epoch position of a peak of a triangular wave which appears in the output of the correlation detecting means when correlation between the spectrum diffusion signal and the specific Gold code identifying the corresponding channel is established, and a data output extracting means responsive to the extraction signal to extract the back-diffusion signal and reproduce the resulting data. In this arrangement, the extraction signal generator means is responsive to the peak of the triangular-form wave in the back-diffusion signal from the correlation detecting means to output the extraction signal. The extraction signal is sent to the data output extraction means to extract back-diffusion signal from the output of the correlation. detecting means and reproduce the data output. Therefore, according to the invention. it is unnecessary to peform PN synchronization in order to obtaining data from the spectrum diffusion signal.
492463
Gowling Lafleur Henderson Llp
Sony Corporation
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