Searching for Spectrum Holes: A 400–800 MHz Spectrum Sensing System


A 400–80zero MHz spectrum sensing system is meant and implemented using 0.18- m CMOS technology for cognitive radios in the UHF TV band. Based on envelope detection, the system employs a down converter, a digitally controlled oscillator, a coffee-pass filer (LPF), a rectifier, a comparator, and a digital management unit to realize spectrum sensing with 10-bit frequency illustration. With variable-gain function of the LPF, signal strength can be measured and presented with a five-bit signal strength index.

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