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

fYear

2007

fDate

25-27 April 2007

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/VDAT.2007.373211

Filename

4239403