Smart radios or cognitive radios (CRs) can look at the utilization of the RF spectrum in their immediate neighborhood and configure themselves for the best performance.įigure 1.2. New kinds of radios can be built that have never before existed. Software-defined radios can talk and listen to multiple channels at the same time. ![]() In fact, the upgrade could be delivered over-the-air. ![]() Software-defined radios can be quickly and easily upgraded with enhanced features. It could be a cordless phone one minute, a cell phone the next, a wireless Internet gadget the next, and a GPS receiver the next. Software-defined radios can be reconfigured “on-the-fly,” i.e., the universal communication device would reconfigure itself appropriately for the environment. The following are some of the things that SDR can do that haven't been possible before: ![]() In the long run, SDR is expected to become the dominant technology in radio communications. Software-defined radio can currently be used to implement simple radio modem technologies. The hardware of a software-defined radio typically consists of a superheterodyne RF front end which converts RF signals from and to analog RF signals, and analog to digital converters and digital to analog converters which are used to convert digitized intermediate frequency (IF) signals from and to analog form, respectively. Software-defined radios have significant utility for cell phone services, which must serve a wide variety of changing radio protocols in real time.
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