随着数字处理技术不断发展,理想软件无线电的最终实现成为可能。本文研究了软件无线电中的关键技术-带通采样下变频技术、数字下变频技术、多速率处理技术。 As digital processing technology continues to evolve, the ultimate realization of an ideal software radio becomes possible. This paper studies the key technologies in software radio - bandpass sampling frequency conversion technology, digital down conversion technology, multi-rate processing technology.