Software defined radio - 20 years later: Part 1 [Guest Editorial]

It has been two decades since the publication of the seminal tutorial "The Software Radio Architecture" in IEEE Communications Magazine. The evolution of Software Defined Radio (SDR) systems had profound impact both in military and multi-standard commercial space. The intent of the feature topic is to capture key elements of the evolution of the enabling technologies as well as SDR solutions for flexible and reconfigurable wireless platforms.