For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.
对于无线数字通信而言，通常将数字用户信号首先转换到模拟域中，然后通过一个或两个步骤将其调制到无线电频率。
For wireless digital communications, digital user signal is usually at first converted into analog domain and then modulated to radio frequency by one or two steps.
对于无线数字通信而言，通常将数字用户信号首先转换到模拟域中，然后通过一个或两个步骤将其调制到无线电频率。
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