Abstract
In this work, a simple and new method is proposed to simultaneously improve the physical layer security and the transmission performance of the optical orthogonal frequency division multiplexing system, by combining orthogonal frequency division multiplexing technique with chaotic theory principles. In the system, a 2-D chaotic map is employed. The introduced system replaces complex operations such as matrix multiplication with simple operations such as multiplexing and inverting. The system performance in terms of bit error rate (BER) and peak to average ratio (PAPR) is enhanced. The system is simulated using Optisystem15 with a MATLAB2016 and for different constellations. The simulation results showed that the BER of an unauthorized receiver reaches 0.5. Furthermore, the peak-to-average-power-ratio (PAPR) of the transmitted OFDM signal can be decreased by about 0.8 dB at BER equal to 10^-4.
Highlights
The optical network has been playing an important role in broadband services
High PAPR is one of the major drawbacks of OFDM modulation. It is defined as the relation between the maximum power of a sample in a given OFDM transmitted frame divided by the average power of that OFDM frame This peak comes from the nature of Inverse Fast Fourier Transform (IFFT) where adding a number of modulated data on each subcarrier, so a large PAPR is produced when all subcarriers added coherently Adnan A.E
The results showed that bit error rate (BER) of eavesdropper was around 0.5, show that high physical layer security combined with enhancement in terms of PAPR
Summary
The optical network has been playing an important role in broadband services. It provides several potential benefits such as high capacity, low cost, and energy efficiency. This factor made the OFDM receiver high sensitive to the nonlinear devices, such as digital-to-analog converter (DAC) and high power amplifier (HPA), which may severely degrade system performance, Tao Jiang, and Wei Zhang, 2008. Another challenge in security O-OFDM system is complexity, most currently available technologies require complex implementation with high computational cost. A 10 Gb/s with optical 16QAM-OFDM transmission and chaos encryption is successfully achieved
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