Electronic warfare (EW) refers to any action involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack an enemy, or impede enemy assaults via the spectrum.

电子战争(EW)是指任何行动涉及使用电磁频谱或定向能以控制该频谱、攻击敌人、或通过频谱阻碍敌人的攻击。

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While government action to free more spectrum is expected, this transaction ensures that the spectrum which is already available for mobile services is used effectively to serve customers.

ENGADGET: Verizon scores new spectrum from Comcast, Time Warner and Bright House for $3.6 billion (update)

CUT, the most powerful union federation, said the action was motivated by a broad spectrum of issues, from rural violence and human rights to privatisation and the recession.

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Without action, he says, demand for spectrum will soon outlast supply.

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