H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/36 (2006.01) H04B 1/707 (2006.01) H04L 1/00 (2006.01) H04L 27/26 (2006.01) H04L 27/34 (2006.01)
Patent
CA 2341439
A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained- bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies the constrained-envelope signal stream (112) and transmits it as a radio-frequency broadcast signal (26).
L'invention porte sur un circuit émetteur (22) pour communications numériques à enveloppe contrainte comportant: une source de données binaires (32) fournissant un signal d'entrée (34); un mappeur de phase (44) transformant le signal d'entrée (34) en un signal de points de phase en quadrature (50) comportant un nombre prédéterminé de symboles par intervalle unitaire de bauds (64), et définissant un point de phase (54) d'une constellation (46) de points de phase; un filtre étaleur d'impulsions (76) filtrant le signal (50) de points de phase et fournissant un signal filtré (74); un générateur (106) d'enveloppe contrainte produisant un signal d'erreur (108) à largeur de bande contrainte à partir du signal filtré (74); un élément retardateur (138) retardant le signal filtré (74) pour produire un signal retardé (140) synchronisé avec le signal d'erreur (108) à largeur de bande contrainte; un circuit complexe de sommation (110) ajoutant le signal retardé (140) au signal d'erreur (108) à largeur de bande contrainte pour donner un signal (112) à enveloppe contrainte; et un amplificateur sensiblement linéaire (146) amplifiant le signal (112) à enveloppe contrainte et l'émettant sous forme de signal RF radiodiffusé (26).
Badke Bradley P.
Cochran Bruce A.
Mccallister Ronald D.
Borden Ladner Gervais Llp
Sicom Inc.
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