Methods and systems for signal analysis in multiple radio carrier environments are provided. In one embodiment, a radio receiver comprises: an adaptive pass band filter that operates over a pass band of frequencies, the adaptive pass band filter subdividing the pass band into a plurality of sub-channels each comprising a narrower bandwidth than the pass band; and a signal analyzer receiving the plurality of sub-channels, the signal analyzer providing feedback to the adaptive pass band filter, wherein the adaptive pass band filter divides the pass band into the plurality of sub-channels based on the feedback; wherein the signal analyzer selectively generates an output comprising of at least one of the plurality of sub-channels.