H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/32 (2006.01) H04B 1/16 (2006.01) H04H 1/00 (2006.01)
Patent
CA 2217429
In a system for simulcasting a digitally modulated signal and an analog FM signal over the same FM frequency band, the composite signal is received and applied to a conventional FM receiver, and a digital receiver in accordance with the invention. An extended Kalman filter is employed in the digital receiver to estimate the analog FM signal based on a version of the recovered FM signal from the FM receiver, and a discrete version of the composite signal whose spectrum has been translated and is at an intermediate carrier frequency. The estimated FM signal, which is in a discrete form, is subtracted from the discrete version of the composite signal. The resulting signal, which is an estimated version of the digitally modulated signal, is demodulated to recover the digital data as transmitted.
Dans un système assurant la diffusion en simultané d'un signal modulé numériquement et d'un signal FM analogique dans la même bande de fréquences FM, le signal composite est reçu et appliqué à un récepteur FM ordinaire et à un récepteur numérique conformément à l'invention. Un filtre de Kalman étendu est utilisé dans le récepteur numérique pour estimer le signal FM analogique selon une version du signal FM rétabli provenant du récepteur FM, et une version discrète du signal composite dont le spectre a été traduit et qui se trouve sur une fréquence porteuse intermédiaire. Le signal FM estimé, sous forme discrète, est soustrait de la version discrète du signal composite. Le signal résultant, qui est une version estimée du signal modulé numérique, est démodulé afin de rétablir les données numériques transmises.
Papadopoulos Haralabos C.
Sundberg Carl-Erik Wilhelm
Kirby Eades Gale Baker
Lucent Technologies Inc.
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