Low-complexity spectrum shaping for OFDM-based cognitive radios

Author

Zhou, Xiangwei ; Li, Geoffrey Ye ; Sun, Guolin

Author_Institution

Sch. of ECE, Georgia Inst. of Technol., Atlanta, GA, USA

fYear

2011

fDate

28-31 March 2011

Firstpage

1471

Lastpage

1475

Abstract

Cognitive radio (CR) technology provides great flexibility in spectrum utilization with orthogonal frequency-division multiplexing (OFDM) as its candidate transmission technique. In this paper, we propose a simple spectrum shaping scheme for OFDM-based CRs to enhance spectral compactness and ensure bandwidth efficiency. By mapping antipodal symbol pairs onto adjacent subcarriers at the edges of the utilized spectrum band, our scheme enables fast power spectral sidelobe decaying without bringing much extra complexity to the transmitter or receiver. Sidelobe suppression and system throughput can be well balanced by adjusting the coding rate while power control on different sets of subcarriers will further deepen the sidelobes. The proposed scheme is also validated by our simulation.

Keywords

OFDM modulation; cognitive radio; radio receivers; radio spectrum management; radio transmitters; subcarrier multiplexing; OFDM-based cognitive radio; adjacent subcarrier; antipodal symbol pair; bandwidth efficiency; candidate transmission technique; coding rate; low complexity spectrum shaping scheme; orthogonal frequency division multiplexing; power control; power spectral sidelobe suppression; radio receiver; radio transmitter; spectral compactness; spectrum band; spectrum utilization; Bit error rate; Decoding; Encoding; Interference; OFDM; Power control; Receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference (WCNC), 2011 IEEE

Conference_Location

Cancun, Quintana Roo

ISSN

1525-3511

Print_ISBN

978-1-61284-255-4

Type

conf

DOI

10.1109/WCNC.2011.5779347

Filename

5779347