大部分单片调制解调器芯片都是依据电话线路设计制造的，即在一条信道上只能实现点对点的通信。
Most single chip modems are designed and manufactured for the telephone circuit. It is only possible to realize point to point communication through one channel with these single chip modems.
现有的点对点通信方式受频谱资源和信道衰落等的限制已经无法满足需求。
The existing point to point communication methods limited by the spectrum of resources and fading channel has been unable to meet demand.
现有的点对点通信方式受频谱资源和信道衰落等的限制已经无法满足需求。
The existing point to point communication methods limited by the spectrum of resources and fading channel has been unable to meet demand.
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