H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 1/20 (2006.01) H03G 3/30 (2006.01) H04B 1/10 (2006.01) H04B 1/18 (2006.01) H04L 27/00 (2006.01) H04B 7/005 (2006.01)
Patent
CA 2220761
- 49 - The object of the present invention is to provide a radio receiver, having a high reception sensitivity, that can limit cross-modulation even during the transmission of a signal that is related to frame synchronization and that has a signal strength different from that of another channel, and that can take into consideration the deterioration of a received signal caused by thermal noise. Gain control means is provided that employs the quality of received data detected by error detection means and the magnitude of a signal output by a band-pass filter in order to determine whether cross-modulation has occurred, and that controls the degree of attenuation provided by a variable gain attenuation means provided at the front end of a reception unit.
Récepteur radio à grande sensibilité, capable de limiter l'intermodulation même pendant la transmission d'un signal associé à la synchronisation de trame et dont l'intensité est différente d'un canal à l'autre, et qui peut tenir compte de la détérioration d'un signal reçu sous l'effet de bruit thermique. Un moyen de commande de gain utilise la qualité des données reçues détectée par un moyen de détection d'erreurs et la valeur d'un signal à la sortie d'un filtre passe-bande afin de déterminer s'il y a eu intermodulation, et commande le degré d'affaiblissement produit par un atténuateur variable présent à l'avant d'un récepteur.
Corporation Nec
G. Ronald Bell & Associates
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