A cognitive radio application of OM-OFDM for implementation in DVB-T2

Author

Dhuness, K. ; Maharaj, B.T.

Author_Institution

Dept. of Electr., Electron. & Comput. Eng., Univ. of Pretoria, Pretoria, South Africa

fYear

2011

fDate

13-15 Sept. 2011

Firstpage

1

Lastpage

6

Abstract

In this paper, the authors have proposed using offset modulation (OM-OFDM) for cognitive radio applications. An examination of the spectrum characteristics of an OM-OFDM transmission demonstrates its strong detection characteristics. Thereafter the methodology behind energy detection is discussed, and a simplified theoretical closed form expression for the probability of a missed detection (P_md) and the probability of a false alarm (P_fa) for an unknown deterministic signal is derived. Then, by using energy detection, the OM-OFDM method is shown to operate at a 15 dB lower average signal-to-noise ratio (SNR) value than an OFDM transmission, while offering similar detection characteristics as an OFDM transmission under Rayleigh fading conditions. The receiver operating characteristic curves in addition indicate that the P_md for an OM-OFDM transmission is 1.3×10^-1 and the P_md for an OFDM transmission is 0.85 (at a P_fa = 10^-1 and average SNR of -5dB) for Rayleigh fading conditions.

Keywords

OFDM modulation; Rayleigh channels; cognitive radio; digital video broadcasting; probability; DVB-T2; OM-OFDM transmission; Rayleigh fading condition; average signal-to-noise ratio; cognitive radio; energy detection; false alarm probability; missed detection probability; offset modulation; receiver operating characteristic curves; spectrum characteristics; Bandwidth; Digital video broadcasting; Fading; Frequency modulation; Peak to average power ratio; DVB-T2; Energy detection; OM-OFDM; PAPR; ROC;

fLanguage

English

Publisher

ieee

Conference_Titel

AFRICON, 2011

Conference_Location

Livingstone

ISSN

2153-0025

Print_ISBN

978-1-61284-992-8

Type

conf

DOI

10.1109/AFRCON.2011.6072108

Filename

6072108