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The center idea behind the software radio architecture is to place analog-to-digital and digital-to-analog converters as near the antenna as possible, leaving the implementation of the most radio functionality to a programmable micro or signal processor. One way to accomplish this in a radio receiver front end is by direct downconverting the desired radio frequency (RF) signal to a target intermediate frequency (IF) using bandpass sampling. Although the bandpass sampling theory for a single RFdoi:10.1109/icc.2003.1203950 dblp:conf/icc/TsengC03 fatcat:gh4tlbnjvbhbdgfqil2hbad5fu