<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Non contiguous orthogonal frequency division multiplexing (NC-OFDM) is an efficient and adaptable multicarrier modulation scheme to be used in cognitive radio communications. However like OFDM, NC-OFDM also suffers from the main drawback of high peak to average power ratio (PAPR). In this paper PAPR has been reduced by employing three different trigonometric transforms. Discrete cosine transform (DCT), discrete sine transform (DST) and fractional fourier transform (FRFT) has been combined with conventional selected level mapping (SLM) technique to reduce the PAPR of both OFDM and NC-OFDM based systems. The method combines all the transforms with SLM in different ways. Transforms DCT, DST and FRFT have been applied before the SLM block or inside the SLM block before IFFT. Simulation results show the comparative analysis of all the transforms using SLM in case of both OFDM and NC-OFDM based systems.</p></abstract>

Non contiguous orthogonal frequency division multiplexing (NC-OFDM) is an efficient and adaptable multicarrier modulation scheme to be used in cognitive radio communications. However like OFDM, NC-OFDM also suffers from the main drawback of high peak to average power ratio (PAPR). In this paper PAPR has been reduced by employing three different trigonometric transforms. Discrete cosine transform (DCT), discrete sine transform (DST) and fractional fourier transform (FRFT) has been combined with conventional selected level mapping (SLM) technique to reduce the PAPR of both OFDM and NC-OFDM based systems. The method combines all the transforms with SLM in different ways. Transforms DCT, DST and FRFT have been applied before the SLM block or inside the SLM block before IFFT. Simulation results show the comparative analysis of all the transforms using SLM in case of both OFDM and NC-OFDM based systems.

Peak to Average Power Ratio Reduction in NC–OFDM Systems

Department of Electrical Engineering, National University of Sciences & Technology Islamabad, Pakistan

Department of Electronics Engineering, Mohammad Ali Jinnah University Islamabad, Pakistan

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Peak to Average Power Ratio Reduction in NC\u2013OFDM Systems"}

Non contiguous orthogonal frequency division multiplexing (NC-OFDM) is an efficient and adaptable multicarrier modulation scheme to be used in cognitive radio...

Peak to Average Power Ratio Reduction in NC–OFDM Systems

Published Online: Jul 14, 2015

Page range: 154 - 158

Received: Jan 06, 2014

DOI: https://doi.org/10.2478/jee-2015-0024

Keywords
peak to average power ratio, non contiguous orthogonal frequency division multiplexing, selected level mapping, discrete cosine transform, discrete sine transform, fractional Fourier transform

© Faculty of Electrical Engineering and Information Technology, Slovak University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Peak to Average Power Ratio Reduction in NC–OFDM Systems

Published Online: Jul 14, 2015

Page range: 154 - 158

Received: Jan 06, 2014

DOI: https://doi.org/10.2478/jee-2015-0024

Keywordspeak to average power ratio, non contiguous orthogonal frequency division multiplexing, selected level mapping, discrete cosine transform, discrete sine transform, fractional Fourier transform

© Faculty of Electrical Engineering and Information Technology, Slovak University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
peak to average power ratio, non contiguous orthogonal frequency division multiplexing, selected level mapping, discrete cosine transform, discrete sine transform, fractional Fourier transform