Frequency offset method and apparatus for use in a transceiver

H - Electricity – 04 – B

Patent

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Details

H04B 1/40 (2006.01) H04B 1/50 (2006.01) H04B 1/56 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2109923

The radio frequency transceiver (300) was developed for use in a time division duplex (TDD) radiotelephone communication system. The transceiver includes a local oscillator (303) which generates at least two local oscillator signals (113) at different times. Each local oscillator signal (113) has a unique frequency. During a first time period, the radio frequency transceiver (300) receives a radio frequency signal (107). The first radio frequency signal (107) is combined with one of the local oscillator signals (113), forming an intermediate frequency signal (311). During a second time period, the transceiver (300) generates a frequency offset signal (312). The frequency offset signal is combined with the second local oscillator signal, (113) forming a second radio frequency signal (107). The intermediate frequency signal (311) and the offset frequency signal (313) are designed to have different frequencies to avoid the self-quieting problem inherent in a TDD communication system.

L'invention est un émetteur-récepteur radiofréquence (300) conçu pour les systèmes de radiotéléphonie à multiplexage temporel. Cet émetteur-récepteur comprend un oscillateur local (303) qui produit au moins deux signaux (113) à des instants différents. Chacun de ces signaux (113) a une fréquence particulière. Durant une première période, l'émetteur-récepteur radiofréquence (300) reçoit un signal radiofréquence (107). Ce premier signal radiofréquence (107) est combiné à l'un des deux signaux (113) produits par l'oscillateur local pour former un signal de fréquence intermédiaire (311). Durant une seconde période, l'émetteur-récepteur (300) produit un signal de décalage de fréquence (312). Ce signal est combiné avec le second signal produit par l'oscillateur local (113) pour produire un second signal radiofréquence (107). Le signal de fréquence intermédiaire (311) et le signal de décalage de fréquence (313) ont des fréquences différentes pour éviter les problèmes d'auto-affaiblissement inhérents aux systèmes de communication à multiplexage temporel.

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