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Recently, Li, Hwu and Ratazzi have proposed a physical-layer security design to guarantee Low Probability of Interception (LPI) for MIMO systems without relying on upper-layer data encryption. The proposed scheme utilizes antenna array redundancy to deliberately randomize the transmitted signals to prevent eavesdropping. Motivated by their idea, in this paper the authors design a physical-layer transmission scheme to achieve LPI in cooperative systems. There are two major differences in cooperative systems: each relay node may have only one antenna that can not provide antenna array redundancy for signal randomization; and there may exist timing errors due to the asynchronous nature of the cooperative systems.
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