The Software Defined Radio (SDR) is a design
paradigm for wireless communications devices.
Its creator, Joseph Mitola, defined the term in the
early90s as an identifier of a class of radios that
could be reprogrammed and reconfigured through
software[12]. Mitola envisioned an ideal Software
Defined Radio, whose physical components were
only an antenna and an Analog Digital Converter
(ADC) on the receiver side. Likewise, the transmitter
would have a Digital Analog Converter (DAC) and a
transmitting antenna. The rest of the functions would
be handled by reprogrammable processors.