1 Introduction
2 System description
2.1 System of NB-LDPC-coded PRCPM
2.2 Modified MAP algorithm for CPM in the Rayleigh fading channel
3 Analysis of the iterative detection process
3.1 Convergence of iteration
3.2 Exchange methods of extrinsic information
4 Weighted exchange method of extrinsic information
Per symbol per iteration | Additions | Multiplications | Log &exp operations |
---|---|---|---|
Direct method | 0 | 0 | 0 |
Weighted method | 0 | 6M
| 2M
|
Average method | 2M
| 2M
| 6M
|
Combined method | 2M
| 8M
| 8M
|
CPM-SISO | 3p
M
L−1(3M+1) | 3p
M
L−1
| 3p
M
L−1(M+1) |
LDPC-SISO | 0 | (2qlog2q+4q)w
c
n
inner
| 0 |
5 Iterative stopping algorithm
5.1 CE stopping criterion
Adjusting parameters |
w=10−1
|
w=10−2
|
w=10−3
|
w=10−4
|
w=10−5
|
---|---|---|---|---|---|
Average iteration number | 5.150 | 5.435 | 5.580 | 5.785 | 5.805 |
BER | 0.0073 | 0.0062 | 0.0057 | 0.0052 | 0.0051 |