Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators / demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system.

Software-defined radio (SDR) is a radio communication system where components traditionally implemented in analog hardware, such as mixers, filters, and modulators, are instead implemented using software on a personal computer or embedded system.

Software-defined radio is a concept according to which RF communication is achieved by using software (or firmware) to perform signal-processing tasks that are typically performed by hardware.