中文说明：这个
English Description：
The system uses different code to transmit the signal for each user: Assign an appropriate code to each transmission channel (DSSS). Frequency hopping over separate channels (FHSS).
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中文说明：这个
English Description：
The system uses different code to transmit the signal for each user: Assign an appropriate code to each transmission channel (DSSS). Frequency hopping over separate channels (FHSS).