Co-channel interference reduction

Details Co-channel interference reduction Co-channel interference reduction

H - Electricity

04

B

H04B 1/10 (2006.01) H04B 7/08 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2231976

Co-channel interference in an AMPS (Advanced Mobile Phone System) receiver, having at least two diversity paths each for producing a received signal (11-12), is reduced by determining weights (25-26) for combining the received signals in dependence upon the received signals and a reference signal (line 27), combining (15-18) the received signals in accordance with the determined weights to produce a combined received signal (20), demodulating (22) the combined received signal, and producing the reference signal by amplitude limiting (42) the combined received signal or modulating (38) the demodulated signal or a signal derived (30-36) from the demodulated signal, so that the reference signal is produced from the combined received signal with amplitude variations reduced and with frequency variations of the desired signal substantially maintained.

Le brouillage sur canal commun dans un récepteur de système de téléphonie mobile perfectionnée (système «AMPS») à deux trajets de réception en diversité au moins (11-12) peut être réduit par la détermination de poids (25-26) servant à combiner les signaux reçus selon leurs caractéristiques et selon un signal de référence (ligne 27), en combinant (15-18) les signaux reçus selon les poids déterminés pour produire un signal reçu combiné (20), en démodulant (22) ce signal reçu combiné, et en produisant le signal de référence par une limitation d'amplitude (42) du signal reçu combiné ou par une modulation (38) du signal démodulé ou un signal dérivé (30-36) du ce signal, de sorte que le signal de référence est produit à partir du signal reçu combiné avec des variations d'amplitude réduites, les variations de fréquence du signal désiré étant essentiellement inaltérées.

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