Table 2 Total number of required quantization bits for each parameter of the Max-Log-MAP algorithms

SISO demapper

Received complex input $(x_{r,q}^I,x_{r,q}^Q)$

(10,10)

Coeff. fading & variance ($h_q^{″}$)/(σ)

8

Constellation complex symbol $(s_{r,j}^I,s_{r,j}^Q)$

(8,8)

Euclidean distance A _q

19

SISO decoder

Received 4 LLRs

4×5

Branch metric γ _k

10

State metric α _k , β _k

10

Extrinsic information z

10