Analysis of an offset modulation transmission

Loading...
Thumbnail Image

Authors

Dhuness, Kahesh
Maharaj, Bodhaswar Tikanath Jugpershad

Journal Title

Journal ISSN

Volume Title

Publisher

Hindawi Publishing Corporation

Abstract

In this article, a method called offset modulation (OM-OFDM) is proposed to control the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. The theoretical bandwidth occupancy of the proposed offset modulated signal is derived. Using these bandwidth occupancy results, a closed-form theoretical bit error rate (BER) expression for an offset modulated transmission is derived and validated. Thereafter, a BER comparison between OM-OFDM and OFDM at a PAPR value of 13 dB shows that both methods offer similar BER characteristics for frequency selective fading channel conditions. The OM-OFDM method in addition is able to accurately control the PAPR of a transmission for a targeted BER. The authors have further proposed a newly applied power performance decision metric, which can be used throughout the PAPR field, in order to compare various methods. By using this power performance decision metric, the authors show that OM-OFDM offers between 4 dB–1.2 dB (60.34%–24.6%) and 4.1 dB–1.2 dB (60.8%–23.6%), net power performance gain (at a BER of 10−4) when compared to a clipped OFDM, OFDM, tone reserved (TR) OFDM and an active constellation extended (ACE) OFDM transmission in a frequency selective fading channel. Finally, by using a complementary cumulative distribution function (CCDF), the OM-OFDM method is shown to offer between 3.2 dB and 2 dB PAPR reduction (at a CCDF of 10−1) when compared to an OFDM, TR, clipped, and ACE OFDM transmission.

Description

This work is currently being patented by the University of Pretoria. Both authors are inventors on the patent, with the University of Pretoria holding the patent rights. This paper is based on work, for which the author has been awarded a PhD at the University of Pretoria. The necessary permissions have been obtained to publish such material.

Keywords

Modulation transmission, Offset modulation, Peak-to-average power ratio

Sustainable Development Goals

Citation

Dhuness, K and Maharaj, BT 2013, 'Analysis of an offset modulation transmission', EURASIP Journal on Wireless Communications and Networking, vol. 2013, no. 19, pp. 1-15.