Question

Which among the following is an important characteristic of software radio?

(a) Digital demodulation and analog filtering

(b) Analog demodulation and digital filtering

(c) Analog demodulation and filtering

(d) Digital demodulation and filtering

This question was posed to me in an online quiz.

The above asked question is from Building CRA on SDR Architecture topic in section Cognitive Radio Architecture of Cognitive Radio

Answer 1

The correct answer is:

(d) Digital demodulation and filtering

An important characteristic of Software Defined Radio (SDR) is the ability to digitally process signals, including digital demodulation and digital filtering, within the radio system. This allows the SDR to be flexible, adaptable, and reconfigurable, as most of the signal processing (traditionally done in analog hardware) is now handled by software.

• Digital demodulation refers to the process of extracting the transmitted information from the modulated signal in digital form, which is a key feature of SDRs.
• Digital filtering involves processing the received signal to remove unwanted noise or interference, and it is done using digital signal processing (DSP) techniques in SDRs.

This digital processing capability is what makes SDRs highly versatile, as they can support a wide range of communication standards by simply updating the software.

So, the correct answer is (d) Digital demodulation and filtering.