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Telecommunication Systems

Physical layer security enhancement for SISO-OFDMA systems via time-reversal filtering and resource allocation

Wenjia Bi, Weijia Lei

Published Jul 17, 2025• 2 citations
Publisher
DOI
10.1007/s11235-025-01336-5

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A frequency domain (FD) time-reversal (TR) precoder is proposed to perform physical layer security (PLS) in single-input single-output (SISO) systems using orthogonal frequency-division multiplexing (OFDM) and artificial noise (AN) signal injection. The AN signal does not corrupt the data transmission to the legitimate receiver but degrades the decoding performance of the eavesdropper. This scheme guarantees the secrecy of a communication towards a legitimate user when the transmitter knows the instantaneous channel state information (CSI) of the legitimate link thanks to the channel reciprocity in time division duplex (TDD) systems, but does not know the instantaneous CSI of a potential eavesdropper. Three optimal decoding structures at the eavesdropper are considered in a fast fading (FF) environment depending on the handshake procedure between Alice and Bob. Closed-form approximations of the AN energy to inject in order to maximize the SR of the communication are derived. In addition, the required conditions at the legitimate receiver's end to guarantee a given SR are determined when Eve's signal-to-noise ratio (SNR) is infinite. Furthermore, a waterfilling power allocation strategy is presented to further enhance the secrecy of the scheme. Simulation results are presented to demonstrate the security performance of the proposed secure system.
Secrecy on the physical layer is receiving increased research interest due to its theoretical and practical importance. In this letter, a subcarrier allocation scheme is proposed for physical-layer security in cooperative orthogonal frequency division multiple access (OFDMA) networks that use the Amplify-and-Forward (AF) strategy. We consider the subcarrier pairing and assignment to maximize overall system rates subject to a secrecy level requirement. Monte Carlo simulations are carried out to validate our analysis.
The broadcast nature of communication systems opens the possibility for attackers to eavesdrop the data and compromise data confidentiality. This study takes the information theoretic security at the physical layer of single‐input single‐output orthogonal frequency division multiplexing (SISO‐OFDM) wiretap system into account, in which, different signal‐to‐noise ratio (SNR) values on the legitimate and eavesdropper's receivers are assumed. The optimisation problem for secure resource allocation is formulated. Then, the secrecy rate of the system is used as the objective function for resource allocation. Finally, a power allocation strategy is obtained. The upper bound of the secrecy capacity of the single‐user system is proposed as a linear function of legitimate receiver's SNR (dB), based on the mentioned strategy. In addition, an iterative power allocation algorithm is proposed for two‐user SISO‐OFDM wiretap channel. Results showed that the proposed algorithm is fast and converges to the optimal value in the second iteration. The upper bound linear model is valid in a two‐user case when there is a relatively large difference between Bob and Eve SNRs.