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●In the following essay，each blank has four choices．Choose the best answer and write down on the answer sheet．smallhighlowlong(67)

多选题
2022-01-13 21:13
A、direct-sequence
B、discrete-sequence
C、duplicate-sequence
D、dedicate-sequence(68) A．dataB．byteC．packetD．bit(69) A．bitsB．frequenciesC．packetsD．messages(70) A．rateB．velocityC．bandwidthD．period
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正确答案
ABBBC
试题解析
【解析】简单地来说，扩频就是在一个可以随时使用的特定频率范围内，把数据用小块在大量不连续的频率上同时发送。使用直序扩频的设备相互之间通信是通过把每个字节的数据分成几个部分在不同的频率上同时传送。直序扩频使用了大约22 Mb的有效带宽。
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