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The article covers the concepts of digital signal processing typically applied between the analog/digital interface and base-band processing. In a receiver and transmitter scheme the signal has to undergo some signal processing steps before the baseband processing is performed on a software programmable digital signal processor (DSP). These signal processing stages between antenna and DSP are grouped as the front end of the transceiver. Due to the high sample rates at which signal processing steps must be performed, hard-wired implementations provide optimal solutions in terms of hardware effort and power consumption, if they were adaptable to the different air interfaces that a software radio must cope with. Thus, they are a means to realize the functionalities of the digital front end of a software radio transceiver with low hardware effort and low power consumption.