Apparatus and method for detecting intermodulation...

H - Electricity – 04 – B

Patent

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H04B 7/26 (2006.01) H04B 1/10 (2006.01) H04B 15/00 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2070768

A radio frequency receiver (300) typically contains electronic devices commonly used in amplifying or mixing circuits (315) which are seldom ideal. The non-ideal characteristics of these devices lead to intermodulation (IM) distortion. A measurement of the amplitude of the received signal (301) is taken both unattenuated (503) and attenuated (507). The difference between the two measurements is compared (511) to predetermined limits (L1, L2 or L3) wherein the received signal (310) is determined to be valid, invalid or unsure. valid received signal is demodulated in the receiver (300). An invalid signal, confirming the presence of IM distortion, is rejected. The unsure signal may be rejected or demodulated as determined by the receiver designer. This type of signal characterization is particularly useful for cellular radiotelephones (101) attempting to gain access to the system provider (111) in which it is registered.

Récepteur RF (300), comprenant en général des dispositifs électriques utilisés d'ordinaire dans des circuits amplificateurs et mélangeurs (315) qui sont rarement idéaux. Les caractéristiques non idéales de ces dispositifs produisent de la distorsion d'intermodulation (IM). L'amplitude du signal reçu (301) est mesurée pour le signal non atténué (503) et pour le signal atténué (507). La différence entre les deux mesures est comparée (511) à des limites prédéterminées (L1, L2 ou L3), le signal reçu (310) étant déterminé valide, non valide ou incertain. Un signal reçu valide est démodulé dans le récepteur (300). Un signal non valide, confirmant la présence de distorsion IM, est rejeté. Le signal incertain peut être rejeté ou démodulé selon ce qui a été déterminé par le concepteur du récepteur. Ce type de caractérisation de signal est particulièrement utile dans le cas des radiotéléphones cellulaires (101) qui tentent d'avoir accès au fournisseur du système (111) dont ils font partie.

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