Decoder for spectrum diffusion signals
First Claim
1. A decoder for spectrum diffusion signals comprising:
- correlation means for comparing a pseudo-random-noise signal included in the spectrum diffusion signal with a predetermined Gold code identifying a specific channel and producing a back-diffusion signal which includes a peak when said pseudo-random-noise signal corresponds to said predetermined Gold code independent of the phase relation of said pseudo-random-noise signal and said Gold code;
extraction signal generator means responsive to said back-diffusion signal for producing an extraction signal at a timing near that at which said back-diffusion signal value reaches said peak; and
extraction means responsive to said extraction signal for extracting a data signal from said back-diffusion signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A decoder for spectrum diffusion signals is capable of reproducing data from received a spectrum diffusion signal, such as satellite communication signals, without performing PN synchronization. The decoder comprises a correlation detector 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 for detecting the epoch position of a peak of a triangular wave which appears in the output of the correlation detector and providing an extraction signal when correlation between the spectrum diffusion signal and the specific Gold code identifying the corresponding channel is established, and a data output extractor responsive to the extraction signal to extract the back-diffusion signal from the output of the correlation detector and reproduce the resulting data. In this arrangement, the extraction signal generator is responsive to the peak of the triangular-form wave in the back-diffusion signal from the correlation detector to output the extraction signal. Therefore, according to the invention, it is unnecessary to perform PN synchronization in order to obtain data from the spectrum diffusion signal.
-
Citations
28 Claims
-
1. A decoder for spectrum diffusion signals comprising:
-
correlation means for comparing a pseudo-random-noise signal included in the spectrum diffusion signal with a predetermined Gold code identifying a specific channel and producing a back-diffusion signal which includes a peak when said pseudo-random-noise signal corresponds to said predetermined Gold code independent of the phase relation of said pseudo-random-noise signal and said Gold code; extraction signal generator means responsive to said back-diffusion signal for producing an extraction signal at a timing near that at which said back-diffusion signal value reaches said peak; and extraction means responsive to said extraction signal for extracting a data signal from said back-diffusion signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A decoder for spectrum diffusion signals comprising:
-
correlation means receiving said spectrum diffusion signal for comparing a pseudo-random-noise signal contained in said spectrum diffusion signal with a predetermined Gold code which identifies a corresponding communication channel and producing a back-diffusion signal including a data component representative of a data indicative phase-shift of said spectrum diffusion signal independent of the phase relation of said pseudo-random-noise signal and said predetermined Gold code; extraction signal generator means associated with said correlation means for detecting a peak value of said data component and producing an extraction signal at a timing near said peak value of said data component; and extraction circuit means receiving said back-diffusion signal and responsive to said extraction signal to extract said data component from said back-diffusion signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A process for reproducing a data signal from a spectrum diffusion signal comprising the steps of:
-
receiving said spectrum diffusion signal, comparing a pseudo-random-noise signal contained in said spectrum diffusion signal with a predetermined Gold code which identifies a communication channel, and producing a back-diffusion signal including a data component which is representative of a data indicative phase-shift of said spectrum diffusion signal and is independent of the phase relation of said pseudo-random-noise signal to said Gold code; detecting peak values of said data component and producing an extraction signal at a timing near each of said peak values of said data component; and extracting said data component from said back-diffusion signal in response to said extraction signal. - View Dependent Claims (24, 25, 26, 27, 28)
-
Specification