Geometric Interpretation of LS The Signal Model s=9,h, 2=1 J(0)=(x-H0)T(x-H0) whxiong@uestc.edu.cn 22whxiong@uestc.edu.cn Geometric Interpretation of LS 22 The Signal Model ^s = X p i=1 µi hi J(µ) = (x ¡ Hµ) T (x ¡ Hµ)