$$\begin{array}{c}{{g}}\\ {{d}}\end{array}$$
0 m  i i l d g 0 m 
$$\mathbf{S}$$
$$\mathbf{\tau}=\mathbf{\tau}$$
$$m\;\rightarrow\;\infty$$
l 2  m m d a T m, n     O m, n log 2 (1 - 1 )
$$O\ m^{-1}$$. 