Secure OTFS Transmission: A Theoretical Framework Based on Discriminatory Channel Estimation

Résumé fourni par la source

This letter investigates physical-layer security for orthogonal time frequency space (OTFS) systems under a discriminatory channel estimation (DCE) scheme that exploits the block-circulant structure of the delay–Doppler channel and coarse prior knowledge. We derive a fixed-point characterization of the linear minimum mean square error (LMMSE) channel-estimation error that captures the impact of pilot power, interference and multipath richness. A closed-form expression for the secrecy rate is obtained, showing that secrecy improves with pilot power at low-to-moderate levels but deteriorates in the high-power regime. Numerical results validate the analysis and reveal trade-offs among pilot allocation, path diversity and secrecy performance.

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