A 0.9–2.6 GHz Cognitive Radio Receiver With Spread Spectrum Frequency Synthesizer for Spectrum Sensing

In this paper, 0.9-2.6 GHz receiver with spread spectrum frequency synthesizer is proposed for spectrum sensing cognitive radio system. With the presence of spread spectrum window generated by local synthesizer, the bandwidth of low-pass filter for spectrum sensing can be fixed, which alleviates the complexity of energy detection block, making it easily embedded into a transceiver chip. The propos...