Spread spectrum communication system

H - Electricity – 04 – B

Patent

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Details

H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04B 7/26 (2006.01) H04J 3/22 (2006.01) H04J 11/00 (2006.01)

Patent

CA 2194722

Low rate data D1-D4 and middle rate data D5 and D6 are time division multiplexed independently according to their rates by a time division multiplexer TDM(A) (110) so that their rates are converted into the rate of high rate data D7 and D8 which are not passed through the time division multiplexer TDM(A) (110). Subsequently, the entire data are converted into biorthogonal signals by biorthogonal signal generators BORTs (121, 122a-125a), and code division multiplexed by a code division multiplexer CDM(A) (130a). The code division multiplexed signal undergoes modulation by a spreading modulator (20) and a carrier modulator (30), and transmitted.

Des données à débit binaire faible D1-D4 et à débit binaire moyen D5 et D6 sont réparties en multiplexage temporel asynchrone, de façon indépendante d'après leurs taux respectifs, au moyen d'un multiplexeur AMRT (TDMA) (110), de manière à convertir leur taux en un taux de données à débit élevé D7 et D8 que l'on ne fait pas passer dans le multiplexeur AMRT (110). Par la suite, toutes les données sont converties en signaux du type bi-orthogonal au moyen de deux générateurs de signaux BORT (121, 122a-125a), et réparties en multiplexage par répartition de code par un multiplexeur AMRC (CDMA) (130a). Le signal multiplexé par répartition de code subit une modulation par un modulateur à étalement (20), ainsi que par un modulateur porteur (30), préalable à la transmission.

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