Novel Windowing Scheme for Cognitive OFDM Systems

Author

Castanheira, Daniel ; Gameiro, Atilio

Author_Institution

Inst. de Telecomun., Aveiro Univ., Aveiro, Portugal

Volume

2

Issue

3

fYear

2013

fDate

Jun-13

Firstpage

251

Lastpage

254

Abstract

In this paper a new shaping window is designed to force the side-lobe of OFDM transmission to decay faster than conventional raised-cosine windowing. The proposed window is a soft-window based on the characteristics of functions with vestigial symmetry, which are common in digital data transmission. By using the vestigial symmetry and enforcing several null derivatives at the extremes of the window, it is possible to control the fast out-of-band decay. Results show that by using a lower roll-off factor (10%) the proposed window can achieve the same performance of raised-cosine (100 %) with around 90% overhead savings, making it of interest for OFDM cognitive radio.

Keywords

OFDM modulation; cognitive radio; OFDM cognitive radio; OFDM transmission; cognitive OFDM systems; digital data transmission; fast out-of-band decay; lower roll-off factor; novel windowing scheme; null derivatives; shaping window; vestigial symmetry; Cognitive radio; Interference; Modulation; OFDM; Time domain analysis; Transmitters; Cognitive radio; OFDM; spectral leakage; vestigial symmetry; windowing;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/WCL.2013.020513.120848

Filename

6459506