“…As for the computational complexity, in the first step of the proposed method, just a single multiplication is required; in the second step, the calculation of 𝒘 T 𝒙 requires 𝑀 multiplications, resulting in a total of 𝑀 + 1 multiplications. A comparison with other state-ofthe-art methods is presented in Table 4, in which [14] is based on a classification instead of a regression for classes of angles 0, 60 • , 120 • , • • • , 300 • ; [18] is based on a classification for three classes (supine, prone, side) using an effective radar cross section; [19] requires eight radar systems, whereas our method requires only a single radar system, which demonstrates the advantage of our approach.…”