Centre National Detudes Spatiales

Alban Duverdier

Xavier Giraud

Wilfried Chauvet

A receiving method for a digital stream, the stream including frames having each a body composed of a variable number c of symbols and preceded by a header including d symbols, a field composed of a fixed number e of symbols unknown to the receiver and defining the number c. A locking phase of the receiving method includes receiving a series of e symbols of the stream;

Method for receiving frames of a digital stream

A spread spectrum method for a digital input signal (x(n)), comprising the following steps: coefficients of a reversible digital periodical linear filter are selected in such a way that the spectrum of the input signal (x(n)) is spread in order to occupy a spread frequency band (B) with the exception of at least one eliminated frequency sub-band (B'), included in a spread frequency band, and the input signal is processed via the digital periodical linear filter in such a way as to obtain a spread spectrum output signal (y(n)).

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Paris, France

Alban Duverdier