Time was when most radio sets had no software at all, and those that had any didn't do much with it. But Joseph Mitola III, an engineer working for a company called E-Systems (now part of Raytheon), envisioned something very different-a mostly digital radio that could be reconfigured in fundamental ways just by changing the code running on it. In a remarkably prescient article he wrote in 1992 for the IEEE National Telesystems Conference, he dubbed it software- defined radio (SDR).
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Koch et al. (2009) studied this question.
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