Abstract
A 400–800 MHz spectrum sensing system is designed and implemented using 0.18- $\mu $ 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 low-pass filer (LPF), a rectifier, a comparator, and a digital control unit to realize spectrum sensing with 10-bit frequency representation. With variable-gain function of the LPF, signal strength can be measured and presented with a 5-bit signal strength index.
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Schedule a callMore From: IEEE Transactions on Very Large Scale Integration Systems
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