Abstract
In this paper, we introduce the optimal signal constellation design (OSCD) in both 2-D and multidimensional cases, which is obtained by minimization of mean square error of optimal source distribution. In addition, by analyzing block-interleaved coded modulation with iterative decoding, in which the bit error rate is reduced by iteration of extrinsic information between a multilevel/multidimensional demapper and an LDPC decoder, with the help of EXIT chart, we propose new mapping methods for OSCDs outperforming previously known ones. The simulation results show that optimized mappings for LDPC-coded OSCDs outperform natural mappings by 0.5 dB in 8-ary 2-D case and 0.6 dB in 16-ary 2-D case. Meanwhile, our proposed optimized mappings for 3-D-8-ary OSCD outperform natural mapping by 0.2 dB and sphere packing constellation by 0.5 dB in coherent optical OFDM few-mode fiber system.
| Original language | English (US) |
|---|---|
| Article number | 6844916 |
| Journal | IEEE Photonics Journal |
| Volume | 6 |
| Issue number | 4 |
| DOIs | |
| State | Published - Aug 2014 |
Keywords
- EXIT chart analysis
- Microwave photonics communications
- blockinterleaved coded modulation (BICM)
- multidimensional constellation sets
- optimal signal constellation
- optimal symbol mapping
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering