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A 400–800 MHz spectrum sensing system is designed using 0.18 μm CMOS technology for cognitive radio in the UHF TV band. Based on the energy detection method, the system employs a mixer, a DCO, a low-pass filer, a peak detector, a comparator and successive approximation registers to realize the spectrum sensing with 10-bit frequency identification and a resolution of 400 kHz. Using variable — gain...
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