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Cognitive Radio (CR) has now been applied for broadband communication systems, so its spectrum sensing technique should be in a broadband signal detection framework. Conventional sensing algorithms such as energy detection are only effective for narrow-band signals or a single broadband signal in the detection range of the spectrum. In this paper a channellization receiver based on DCT filter banks is adopted, which can divide a wide frequency scope into a number of small sub-channels, so energy detection or other sensing algorithm can be used to determine the existence of the primary user within these subchannels.
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