Design and Implementation of Secure CP-Less Multi-User OCDM Transceiver for 6G Wireless Communication Networks

• Published in: IEEE access 2024, Vol.12, p.79276-79296
• Main Authors: Hossain, Md. Najmul, Raad, Raad, Sooppy Nisar, Kottakkaran, Enayet Ullah, Shaikh, Jabin, Fowzia, Kamal, Sk. Tamanna, Shimamura, Tetsuya, Tubbal, Faisel, Abulgasem, Suhila
• Format: Article
• Language: English
• Subjects: 6G mobile communication; Algorithms; Audio data; BER; Bit error rate; Channel coding; Chirp; Code division multiplexing; Codes; Coding; Communication networks; Correlation coefficients; cyclic prefix-less; Data transmission; Distribution functions; Eavesdropping; Error detection; Fourier transforms; Mathematical models; Millimeter wave communication; Millimeter waves; Multiplexing; OCDM; OFDM; OOB; PAPR; Parity; Performance measurement; physical layer security encryption; Quadrature amplitude modulation; Signal detection; Signal to noise ratio; SINR; Symbols; Wireless communications
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2024.3409473

In this paper, we designed and implemented a multi-antenna configured secure millimeter-wave (mmWave) CP-less multi-user orthogonal chirp division multiplexing (OCDM) transceiver. The proposed simulated system emphasizes more applicable performance metrics for a typically assumed case of four users and a passive eavesdropper for audio data transmission. We introduce a four-dimensional hyperchaotic system-based encryption algorithm to enhance physical layer security (PLS). In addition, low-density parity check (LDPC), TURBO, ( 3, 2 ) single parity check (SPC), and repeat and accumulate (RA) channel coding with Cholesky decomposition-based zero-forcing (CD-ZF) and minimum mean square error (MMSE) signal detection techniques for a better bit error rate (BER) were also implemented. The simulation results signify the effectiveness of the proposed system in terms of PLS enhancement with low correlation coefficients (14.62%, 7.61%, 13.61%, and 15.39% for users 1, 2, 3, and 4, respectively), an achievable secrecy rate with a low signal-to-interference and noise ratio (SINR) of the passive eavesdropper, an achievable out-of-band (OOB) power emission of 341 dB, an estimated average short-time Fourier transform (STFT) spectral power difference of 7.68 dB and estimated peak-to-average power ratios (PAPRs) ranging from 7 to 7.5 dB at a complementary cumulative distribution function (CCDF) of 1\times 10^{-3} for different ground transmitting channels. At an identical signal-to-noise ratio (SNR) of 17 dB, all four users achieved a bit error rate of 1\times 10^{-4} under RA channel coding, CD-ZF, and 16-QAM (quadrature amplitude modulation) digital modulation.