Table 6 Required number of demapping iterations y Lim for different modulation schemes and code rates to achieve identical complexity (arithmetic operations, or read, or write access memory) as for x =6 and z =0
From: Complexity adaptive iterative receiver performing TBICM-ID-SSD
Modulation scheme | CASE1 (with recomputed Euclidean distances) | CASE2 (with stored Euclidean distances) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
R c =1/2 | R c =6/7 | R c =1/2 | R c =6/7 | |||||||||
Arith | Load | Store | Arith | Load | Store | Arith | Load | Store | Arith | Load | Store | |
QPSK | 4.2 | 4.4 | 5.5 | 4.8 | 4.9 | 5.7 | 5.6 | 4.2 | 4.9 | 5.8 | 4.8 | 5.3 |
QAM16 | 2.9 | 3.9 | 5.5 | 3.6 | 4.6 | 5.7 | 4.1 | 3.4 | 4.4 | 4.7 | 4 | 5 |
QAM64 | 1.8 | 2.8 | 5.5 | 2.2 | 3.4 | 5.7 | 2.4 | 2.2 | 2.7 | 2.9 | 2.8 | 4 |
QAM256 | 1.3 | 1.7 | 5.5 | 1.4 | 2.1 | 5.7 | 1.4 | 1.5 | −2.9 | 1.7 | 1.8 | 0.6 |