Title :
A 4-Channel Poly-Phase Filter for Cognitive Radio Systems
Author :
Chen, Guan-Jun ; Chiu, Hsien-Hsiang ; Lee, Tai-Cheng
Author_Institution :
Nat. Taiwan Univ., Taipei
Abstract :
A 4-channel poly-phase filter is proposed for cognitive radio systems. The cognitive radio system can sense the spectrum utilization and achieve higher transmission efficiency. To maximize the dynamic range of the receiver, the multi-channel poly-phase filter is required in the cognitive radio receiver to suppress the interference that is typically generated by legacy users. The filter is able to select different channels according to the demand of the system. A chip is fabricated in 0.18-mum CMOS technology. It dissipates 13.4 mW and achieves 35-dB adjacent channel rejection.
Keywords :
cognitive radio; interference suppression; radio receivers; radiofrequency filters; 4-channel poly-phase filter; adjacent channel rejection; cognitive radio receiver; cognitive radio system; interference suppression; multichannel poly-phase filter; spectrum utilization; CMOS technology; Channel allocation; Circuits; Cognitive radio; Dynamic range; Frequency; Gyrators; Low pass filters; Prototypes; Receivers;
Conference_Titel :
VLSI Design, Automation and Test, 2007. VLSI-DAT 2007. International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0583-1
Electronic_ISBN :
1-4244-0583-1
DOI :
10.1109/VDAT.2007.373211
