Ref. [8] Present method

${\epsilon }_1={10}^{-j}$

N = 128 M = 2

N = 256 M = 8

N = 512 M = 32

N = 1024 M = 128

N = 2048 M = 512

j = 1

5

4

3

3

2

j = 2

2

2

2

1

1

j = 3

1

1

1

1

1

j = 4

1

1

1

1

1

j = 5

1

1

1

1

1

j = 6

1

1

1

1

1

j = 7

1

1

1

1

1

j = 8

1

1

1

1

1