After the evolution from analog to digital , and from fixed to mobile communication , radio systems are undergoing the third revolution from hard - wired radios to software - defined radios 软件无线电是无线电领域模拟通信到数字通信，固定通信到移动通信之后，从硬件定义的无线电通信到软件定义的无线电通信的第三次革命。
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