DIRECT SEQUENCE SPREAD SPECTRUM DIGITAL TRANSMISSION METHOD USING SEQUENCE CHANGES DURING THE TRANSMISSION AND TRANSMITTER AND RECEIVER IMPLEMENTING SAID METHOD

摘要

abr. (g). descriptionmethod of digital spread spectrumin direct sequence to sequence change duringtransmission and transmitter and receiver implementationthe receiver includes: a receiving means and a demodulateurs (20) from the received signal with a sequence of elements'complex (s (kt); means (26) to producesequence of complex elements (c) consist of consecutive elementswhich combination of homologous elements used in the show.means (27) for receiving and synchronizing sequencehow to increase the issue of complex elements(s) (kt)) obtained at the outlet of the demodulation sequence represented byaccordingly, successive elements and complex products and synchronisu00e9s consumers; and means (28) for the duration of thatan information symbol is the resulting complexafter this period, in order to provide an estimate of theinitial information symbols used in the program.according to the invention, it also comprises means (21)22, 23, 24) for analysis of complex components (s (kt)) obtained byexit block so as to determine a markingintroduced on the show, and selector means (25),according to the marking, and set so as to maintain thethe same sequence of complex elements in combination, or changesequence; changes occurring in successive sequencesrandom intervals determined by the receiver as a function of theanalysis of the marking, but in a deterministic order.the receiver is known per se.the marking may be the value researchfor or against, assigned to the first two elements of thecorresponding to each information symbol sequence.(figure 3).