同时，根据信道特点和数据传输速率的要求给出了深空通信的调制方式。
Meanwhile, modulation schemes for deep space communication are provided based on channel features and requirements on data transmission rates.
无线资源管理协议负责为CDPD数据流选择一个合适的信道进行数据传输。
Radio resource management protocol is in charge of selecting one better channel for CDPD data transmission.
当信道上没有数据传输时，通信双方应每隔时间C发送链路检测包以维持此连接。
When there are not data being transmitted on the channel, both sides shall send link test packets every time interval C to maintain the connection.
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