It is first time to adopt the high-speed frequency spread microwave network for China Seismological Bureau.

采用扩频微波方式组网在地震系统还尚属首次。

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Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.

海洋水声信道是多途、时变和频散的信道。

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The CDMA based on the radio frequency spread technique has been a very attractive multiple access technique in the radio communication field since 1990.

以无线扩频通信技术为基础的CD ma技术，是进入90年代以来无线通信领域十分引入注目的多址通信技术。

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Lamarr termed the technique "frequency hopping, " a forerunner of the spread-spectrum technology that is used today in communications applications such as Wi-Fi.

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What is new is the frequency of people's contact with them and how easily they can now be spread around the world.

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The radiation just spread out into space - where it still is and can be detected as weak waves of radio frequency.

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