ON IF-TO-BASEBAND TRANSLATION AND RESAMPLING IN SAMPLED-DATA RECEIVERS

Abstract

This paper summarizes the design of a discrete-time quadrature downconversion and resampling processor that operates on samples of a 70 MHz IF signal. The unique properties of discrete-time processing—aliasing due to resampling bandpass signals and polyphase filter decompositions—are applied to create a low-complexity approach that does not require any arithmetic operations at the IF sample rate. The required tasks are performed in two stages: a downsample-by-2 operation followed by a more traditional resampler based on a polyphase filterbank.