Software Defined Radio

By WikiPedia the definition of software defined radio (SDR) is a radio communication system which uses software for the modulation and demodulation of radio signals. This is not like the good old analog transceivers.

An SDR performs significant amounts of signal processing in a general purpose computer, or a reconfigurable piece of digital electronics. The goal of this design is to produce a radio that can receive and tramsit a new form of radio protocol just by running new software.

It is like you can listen to the radio and have a phone call by 1 piece of electronic hardware since the modulation and demodulation is done in software.

Software radios have significant utility for the military and cell phone services, both of which must serve a wide variety of changing radio protocols in real time.

The hardware of a software-defined radio typically consists of a superheterodyne RF front-end which converts RF signals from (and to) analog IF signals, and analog to digital converter and digital to analog convertors which are used to convert a digitised IF signal from and to analog form, respectively.

Software-defined radio can currently be used to implement simple radio modem technologies. In the long run, software-defined radio is expected by its proponents to become the dominant technology in radio communications.


The main problems today are building a receiver that works with frequenties from 0 till infinity.


There are today some manufacturers who are building SDR plaforms around FPGA's like there are EONIC's and National Instruments (NI).



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