Table 1 Key notations used throughout the article
From: Low complexity soft demapping for non-binary LDPC codes
q | GF order (default value q = 64) |
|---|---|
Ω | Alphabet of q GF symbols |
M | QAM constellation order (e.g., QPSK → M = 4; 16QAM → M = 16) |
A | Alphabet of M QAM constellation symbols |
q m | Number of APP values per GF symbol fed to the decoder (< <q) |
n t | Number of transmitter antennas |
n r | Number of receiver antennas |
Q | Number of QAM symbols mapped onto one STBC codeword |
T | STBC block length (as expressed in MIMO channel uses) |
m 1 | Minimum integer number of GF(q) symbols which map onto m2 M-QAM symbols and m3 STBC codewords |
n 1 | Number of GF(q) symbols multiplexing within n2 (≤m2) M-QAM symbols and n3 (≤m3) STBC codewords, (n1 ≤ m1) |
m 2 | Minimum integer number of M-QAM symbols which map to m1 GF(q) symbols and m3 STBC codewords |
n 2 | Number of M-QAM symbols carrying one GF(q) symbol, (n2 ≤ m2) |
m 3 | Minimum integer number of STBC codewords which map to m1 GF(q) symbols and m2 M-QAM symbols |
n 3 | Number of STBC codewords carrying one GF(q) symbol, (n3 ≤ m3) |