5.2.3 Mapping for 3.84 Mcps MBSFN IMB
25.2233GPPRelease 17Spreading and modulation (TDD)TS
5.2.3.1 Modulation mapping for data
Mapping of data bits onto a QPSK or 16-QAM signal point constellation shall be accomplished as described in subclause 5.1.1.1 or 5.1.1.2 of [4] respectively.
5.2.3.2 Modulation mapping for TFCI
In the case of S-CCPCH frame type 1 and S-CCPCH frame type 2 using QPSK modulation for data, TFCI bits shall be QPSK modulated according to subclause 5.1.1.1 of [4].
In the case of S-CCPCH frame type 2 using 16-QAM modulation for data, each consecutive pair of binary-valued TFCI bits {b2q, b2q+1}, with q = {0,1,2,…} shall be mapped according to the rotated QPSK constellation given by the following table.
|
{b2q , b2q+1} |
I branch |
Q branch |
|
{0,0} |
0.4472 |
1.3416 |
|
{0,1} |
1.3416 |
-0.4472 |
|
{1,0} |
-1.3416 |
0.4472 |
|
{1,1} |
-0.4472 |
-1.3416 |