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This letter investigates the secure delivery performance of therate-splitting multiple access scheme in land mobile satellite (LMS) systems,considering that the private messages intended by a terminal can beeavesdropped by any others from the broadcast signals. Specifically, theconsidered system has an N-antenna satellite and numerous single-antenna landusers. Maximum ratio transmission (MRT) and matched-filtering (MF) precodingtechniques are adopted at the satellite separately for the common messages(CMs) and for the private messages (PMs), which are both implemented based onthe estimated LMS channels suffering from the Shadowed-Rician fading. Then,closed-form expressions are derived for the ergodic rates for decoding the CM,and for decoding the PM at the intended user respectively, and moreimportantly, we also derive the ergodic secrecy rate against eavesdropping.Finally, numerical results are provided to validate the correctness of theproposed analysis models, as well as to show some interesting comparisons.

Secure Rate-Splitting Multiple Access Transmissions in LMS Systems