Asynchronous digital correlator and demodulators including a correlator of this type
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United States of America Patent
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Jun 12, 1990
Grant Date -
N/A
app pub date -
Apr 4, 1989
filing date -
Apr 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A demodulator to demodulate a complex signal formed by two carriers, in quadrature, the spectrum of which is spread by a pseudo-random signal, and which are modulated by an M-ary, Walsh, code comprises: a chain of registers to store 256 bits of a pseudo-random signal; a multiplexer to temporally multiplex the processing of the two carriers; a chain of correlation macro-cells having a systolic structure enabling temporal multiplexing and having intermediate outputs providing for partial correlation values on 16 chips; a device for the computation of linear combinations of the functions of partial correlation, to compute two functions of correlation corresponding to two carriers for each M-ary code; a demultiplexing and computation device to compute the module of the function of correlation for each of the Walsh codes which may modulate the signal to be demodulated; a device for the selection of the greatest value of the correlation functions and for the selection of the corresponding piece of data.
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