modulation (DM) physical‐layer secured transmitters for orthogonal frequency‐division
multiplexing (OFDM) wireless data transfer can be constructed. In this paper, three‐state
TMAs are introduced for OFDM DM systems which allow more flexible manipulation of the
injected orthogonal artificial noise and hence improve security. In particular, this paper
presents for the first time both static and dynamic three‐state time‐modulated OFDM DM …