Advanced interference reduction in NC-OFDM based Cognitive Radio with Cancellation Carriers

Author

Kryszkiewicz, Pawel ; Bogucka, Hanna

Author_Institution

Poznan Univ. of Technol., Poznan, Poland

fYear

2014

fDate

1-5 Sept. 2014

Firstpage

571

Lastpage

575

Abstract

Reduction of the out-of-band (OOB) emission is essential for Cognitive Radio (CR) systems to enable coexistence with licensed (primary) systems operating in the adjacent frequency bands. This paper proposes an algorithm for the Non Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM)-based CR, to reduce the interference caused by both OOB radiation and by non-ideal frequency selectivity of a primary user (PU) receiver. It is based on a concept to use a set of subcarriers called Cancellation Carriers (CCs). By being aware of the PU´s carrier frequency, the observed interference power can by decreased by about 10 dB in comparison with the standard OOB-power minimizing algorithms.

Keywords

OFDM modulation; cognitive radio; interference suppression; NC-OFDM; OOB emission reduction; OOB radiation; adjacent frequency bands; cancellation carriers; cognitive radio; interference power; interference reduction; noncontiguous orthogonal frequency division multiplexing; nonideal frequency selectivity; out-of-band emission reduction; primary user receiver; Cognitive radio; Interference; Minimization; OFDM; Receivers; Standards; Vectors; NC-OFDM; Out-of-Band radiation; cancellation carriers; cognitive radio; enhanced OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference (EUSIPCO), 2014 Proceedings of the 22nd European

Conference_Location

Lisbon

Type

conf

Filename

6952173