Parameters

Values

Number of active users $K_{\text{a}}$

50

100

150

Collision threshold T

4

6

9

Transmitted bits per user

90

90

90

LDPC code rate

1/3

1/3

1/3

Length of time slot

1350

1350

1350

Repetition pattern

$\frac{1}{4}{x}^3+\frac{3}{4}{x}^2$

$x^2$

$\frac{7}{9}{x}^2+\frac{2}{9}x$

External iterations

4

4

4

Iterations of detector

15

15

15

Iterations of LDPC decoder

20

20

20