空中下载技术是一种通过移动通信的空中接口对移动终端内存及SIM卡数据进行远程管理的技术。
Over-the-air technology which download the data of EMS memory and SIM card in mobile station through the air interface of mobile communication present a solution to these challenges.
用软件无线电技术实现的调制解调灵活性好，可以通过空中下载实现不同的调制方式，从而适应不同的通信体制。
It is flexible for the modulation and demodulation by software, and it may realize different modulation mode through the airborne downloading, therefore it suits the different communication systems.
用软件无线电技术实现的调制解调灵活性好，可以通过空中下载实现不同的调制方式，从而适应不同的通信体制。
It is flexible for the modulation and demodulation by software, and it may realize different modulation mode through the airborne downloading, therefore it suits the different communication systems.
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