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Secure and low PAPR OFDM system using TCCM

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Abstract

Rapid communication uses orthogonal frequency division multiplexing (OFDM) to transfer multimedia data. OFDM combats frequency-selective fading and increases bandwidth efficiency. With many subcarriers, OFDM suffers from an elevated peak-to-average power ratio (PAPR), which hinders the potential of OFDM. The nonlinearity in the transmitted waveform is the result of high PAPR. This study implements compressed sensing (CS) to reduce PAPR because the OFDM signal is sparse in its frequency domain. Thus, the transmitter multiplies a well-designed topologically conjugate chaotic circulant matrix (TCCM), and the receiver end uses orthogonal matching pursuit (OMP). The TCCM involves a considerable selection of topologically conjugate chaotic functions. Chaotic matrices are preferred because they provide secure data transmission, and any minor change in the chaotic parameters results in irrecoverable data. The suggested chaotic system is validated using the bifurcation diagram (BD), Lyapunov exponent (LE), etc. This structured matrix reduces the PAPR considerably from 13 dB to below 7.5 dB, and its evaluation metric is the CCDF (complementary cumulative distribution function). Also, the investigation of the OFDM system involves image transmission, and the comparison is completed with a Gaussian matrix (GM), producing an improved peak-signal-to-noise ratio (PSNR) and bit error rate (BER) with reduced PAPR. This technique secures the data and reduces the PAPR, making it suitable for all future networks including cognitive and 5G networks.

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    1. CSE Department, K.L.N. College of Engineering, Pottapalayam, Sivagangai Dt, 630612, Tamilnadu, India

      Jemimah J P P & S Miruna Joe Amali

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    J P P, J., Amali, S.M.J. Secure and low PAPR OFDM system using TCCM. Ann. Telecommun. 78, 459–474 (2023). https://doi.org/10.1007/s12243-023-00948-9

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