Abstract
A spectrum sensing system is designed and implemented using $0.18~{\mu }\text{m}$ CMOS technology for cognitive radio applications. This system consists of a low noise amplifier (LNA), a mixer, a low-pass filter (LPF), a rectifier, a voltage comparator, a digital control unit (DCU) and a frequency synthesizer. Based on envelope detection, spectrum sensing is performed from 401.569 to 802.745 MHz, where the frequency information and signal strength of the received signal can be presented by the 10-bit digital frequency output and 5-bit signal strength index, respectively. The system achieves the sensing time of 0.164 sec and sensing sensitivity of −75 dBm with the frequency resolution of 392.2 kHz.
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