Transcript ppt00002.ppt

Some Ideas on Constellation Mapping
• By redefining the co-set labels (L,C and R), and assuming there is
no THP for the moment, the modified mapping has 1.1dB gain
comparing with the original mapping, and 0.65 dB gain comparing
with 1D PAM12 (see the following pages).
7/26/2016
1
Modified Coset Label Definition
Original Mapping
00
10
11
01
00
10
11
01
00
10
11
01
L
L
L
L
C
C
C
C
R
R
R
R
-11
-9
-7
-5
-3
-1
1
3
5
7
9
11
Modified Mapping
00
10
11
01
00
10
11
01
00
10
11
01
C
C
L
L
L
L
R
R
R
R
C
C
-11
-9
-7
-5
-3
-1
1
3
5
7
9
11
7/26/2016
2
Modified 2D 128 Point Constellation
-5
-3
-1
1
3
5
7
9
-11
11
-9
-7
-5
-3
-1
1
3
5
7
9
11
11
-7
-11
-9
-9
-7
-7
-5
-5
-3
-3
-1
-1
1
1
3
3
5
5
7
7
9
9
11
-9
-11
-11
Original mapping with Es = 53
Modified mapping with Es = 41
7/26/2016
3