scholarly journals Peak to Average Power Ratio Reduction in NC–OFDM Systems

2015 ◽  
Vol 66 (3) ◽  
pp. 154-158 ◽  
Author(s):  
Saadia Tabassum ◽  
Sajjad Hussain ◽  
Abdul Ghafoor
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Fractional Fourier Transform ◽  
Average Power ◽  
Modulation Scheme ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Radio Communications ◽  
Trigonometric Transforms ◽  
Power Ratio Reduction ◽  
Ratio Reduction

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.

scholarly journals A novel generalized oppositional biogeography-based optimization algorithm: application to peak to average power ratio reduction in OFDM systems

2016 ◽  
Vol 14 (1) ◽  
pp. 705-722 ◽  
Author(s):  
Sotirios K. Goudos
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Papr Reduction ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Major Drawback ◽  
A New Technique ◽  
Power Ratio Reduction ◽  
Ofdm Signals ◽  
Ratio Reduction

AbstractA major drawback of orthogonal frequency division multiplexing (OFDM) signals is the high value of peak to average power ratio (PAPR). Partial transmit sequences (PTS) is a popular PAPR reduction method with good PAPR reduction performance, but its search complexity is high. In this paper, in order to reduce PTS search complexity we propose a new technique based on biogeography-based optimization (BBO). More specifically, we present a new Generalized Oppositional Biogeography Based Optimization (GOBBO) algorithm which is enhanced with Oppositional Based Learning (OBL) techniques. We apply both the original BBO and the new Generalized Oppositional BBO (GOBBO) to the PTS problem. The GOBBO-PTS method is compared with other PTS schemes for PAPR reduction found in the literature. The simulation results show that GOBBO and BBO are in general highly efficient in producing significant PAPR reduction and reducing the PTS search complexity.

scholarly journals Peak-to-average power ratio reduction based on Cross-Correlation in OFDM systems

2014 ◽  
Author(s):  
Mohsen Kazemian ◽  
Pooria Varahram ◽  
Shaiful Jahari B. Hashim ◽  
Borhanuddin B. Mohd. Ali ◽  
Somayeh Mohammady ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Average Power ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Power Ratio Reduction ◽  
Ratio Reduction

scholarly journals Peak-to-Average Power Ratio Reduction Using New Swarm Intelligence Algorithm in OFDM Systems

2019 ◽  
Vol 32 ◽  
pp. 831-839 ◽  
Author(s):  
Amhaimar Lahcen ◽  
Attari kamal ◽  
Halaoui Mustapha ◽  
Elyaakoubi Ali ◽  
Ahyoud Saida ◽  
...  
Keyword(s):  
Swarm Intelligence ◽  
Average Power ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Intelligence Algorithm ◽  
Power Ratio Reduction ◽  
Swarm Intelligence Algorithm ◽  
Ratio Reduction
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