DOA of correlated signals is difficult question of space spectrum estimation.

相干信号源的测向是空间谱估计的一个难题。

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TV white space spectrum signals travel well, making it well suited for mobile wireless devices.

电视白色空间频段上的信号传输稳定。所以这个频段非常适于无线移动设备的应用。

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Whitt said he expected devices using white-space spectrum could be available by the end of 2009.

威特先生说，他期待使用空白频段的设备到2009年底就会出现。

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There, Microsoft have invested in developing white space spectrum to bring an African audience into the Web and into device ownership.

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He notes that they recently freed up TV white space spectrum.

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Based on this, engineers in my company and others, many belonging to institutions such as the IEEE (Institute of Electrical and Electronics Engineers), have got together to develop a standardised technology that will work well with the spectrum identified - "white space spectrum" - and be optimal for machines.

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