...
机译:
Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA;
Univ Alcala De Henares, Dept Signal Theory & Commun, Polytech Sch, Alcala De Henares 28871, Spain;
Frequency-shift keying (FSK) radar; range tracking; spectrum efficiency; stationary human; vital signs monitoring; wireless sensor;