Self calibrating low if digital image rejection receiver for mobile communications

Here we present and develop a receiver capable of capturing two RF channels at the same time with a single RF front end and only one IF stage. The idea is to use a low IF digital image rejection receiver that can separate two adjacent RF channels with a negligible cochannel's image interference. We analyze two procedures of compensating, in the IF range, any gain and phase misadjustment generated in the RF mixing section that could produce some residual images in any of the channels. The first one needs the help of an internal reference or pilot signal whereas the second one implements a blind procedure that only needs the current working signals.