Time-Domain Hybrid Coded QAM Mitigating the Nonlinearity in Underwater VLC Systems
- Resource Type
- Conference
- Authors
- Xu, Zengyi; Luo, Zhiteng; Lin, Xianhao; Qin, Guojin; Niu, Wenqing; Zhang, Junwen; Shen, Chao; Chi, Nan
- Source
- 2023 IEEE 23rd International Conference on Communication Technology (ICCT) Communication Technology (ICCT), 2023 IEEE 23rd International Conference on. :417-421 Oct, 2023
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Signal Processing and Analysis
Q-factor
Phase shift keying
Quadrature amplitude modulation
System performance
Probabilistic logic
Robustness
Time-domain analysis
UVLC
TDHCQ
TDHQ
Flexible transponder
QAM
PS
- Language
- ISSN
- 2576-7828
We proposed a time-domain coded probabilistic shaping (TDHCQ) method to replace traditional time-domain hybrid QAM (TDHQ) in underwater VLC systems. Similar to TDHQ, it introduces shaping gain to approach the Shannon limit and enables a 16QAM system to operate at flexible communication rates without modifying the hardware. Simultaneously it enhances the system performance under strong amplitude nonlinearity by degenerating QAM constellation in non-equidistance PSK ones. These characteristics help the proposed coding scheme outperform TDHQ in the simulated underwater channel, expanding the operating distance by 22 % and increasing the quality factor by at most 0.32dB.