Andrea Goldsmith: There's not enough spectrum to assign every phone in the world its own dedicated channel so we have to reuse the channels and that causes interference between users.
White space is industry lingo for the unused airwaves that abut TV spectrum and provide a buffer from stray signals and other interference.
white space是行业术语，指的是毗连电视频段的未使用的波段，它还可以为收到的杂散信号和其他干扰提供缓冲。
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Conducted spectrum of switched power sources, a typical interference source, is analyzed in this paper, and the design techniques have been introduced to minimize conducted interference.