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The frequency diverse array (FDA) based directional modulation (DM)technology plays an important role in the implementation of the physical-layersecurity (PLS) transmission of 5G and beyond communication system. In order tomeet the tremendous increase in mobile data traffic, a new design consumingless memory for the FDA-DM-based PLS transmission is urgently demanded. In thispaper, an analytical symmetrical multi-carrier FDA model is proposed in threedimensions, namely, range, azimuth angle, and elevation angle, which differsfrom the conventional analytical approach with only range and azimuth angleconsidered. Then, a single-point (SP) artificial noise (AN) aided FDA-DM schemeis proposed, which reduces memory consumption of FDA-DM systems significantlycompared with the conventional zero-forcing (ZF) and singular valuedecomposition (SVD) approaches. Moreover, the PLS performance of the proposedlow-memory-consumption FDA-DM scheme is analyzed in fluctuating two-ray (FTR)fading channels for the first time, including bit error rate (BER), secrecyrate (SR), and secrecy outage probability (SOP). More importantly, theclosed-form expressions for the lower bound of the average SR and the upperbound of the SOP are derived, respectively. The effectiveness of the analyticalexpressions is verified by numerical simulations. This work opens a way tolower the memory requirements for the DM-based PLS transmission of 5G andbeyond communication system.

Physical-Layer Security for Frequency Diverse Array Based Directional Modulation in Fluctuating Two-Ray Fading Channels