Patent ID: 7567633

Claim:
A reception device for a transmission system that uses a direct sequence spread spectrum that includes a decoder for decoding a digital input signal composed of bits, in which each bit, depending on its value, is represented by one or another of two symbols that respond to a spread code; each symbol being composed of a sequence of N symbol elements distributed over one or another of two different levels; the N symbol elements of the first symbol being negatively correlated to the corresponding N symbol elements of the second symbol; the reception device comprising: a first and a second comparator for comparing the amplitude of the output signal of the decoder with lower and upper threshold values, the first comparator delivering a data signal that is representative of the decoded symbols of the input signal, which includes a first bit when the amplitude of the output signal of the decoder is greater than the upper threshold value, and a second bit when the amplitude of the output signal of the decoder is lower than the lower threshold value, and the second comparator delivering a clock signal for capturing the data of said data signal, said clock signal including a clock pulse edge as soon as the amplitude of the output signal of the decoder becomes lower than or greater than the lower threshold value and as soon as said amplitude becomes greater than or lower than the upper threshold value; first means for generating a replacement clock signal for data capture, traced on the clock signal originating in the clock comparator; first and second storage means rated by the replacement clock signal for storing the data taken respectively from the data signal originating in the data comparator and from a binary signal generated at the output of the decoder, representative of the output signal sign of the decoder; second means for generating a clock signal, that is offset with respect to the replacement clock signal; and data selecting means to capture, at each pulse edge of the offset clock signal, either the stored data originating in the signal that is representative of the output signal sign of the decoder in case of loss of the previous clock pulse edge at the output of the clock comparator, or the stored data originating in the data signal.