Wu Yue, Li Yiding, Li Baolong
Changwang School of Honors, Nanjing University of Information Science and Technology, Nanjing 210044, China.
School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Sensors (Basel). 2025 Aug 17;25(16):5109. doi: 10.3390/s25165109.
In the realm of optical wireless communication (OWC), augmented spectral efficiency discrete multitone (ASE-DMT) has been widely recognized as a promising modulation due to its outstanding spectral efficiency and high power efficiency. However, ASE-DMT exhibits an inherently high peak-to-average power ratio (PAPR), which exacerbates error propagation and leads to a substantial transmission performance degradation in the successive interference cancellation (SIC) receiver of ASE-DMT. Therefore, a novel low-PAPR ASE-DMT scheme (LP-ASE-DMT) is proposed in the paper. Given the intricate multi-depth signal superposition of ASE-DMT, a progressive multi-level constellation extension algorithm is developed to effectively suppress the PAPR of the transmitted signal, while simultaneously achieving much lower computational complexity compared to conventional constellation extension schemes. Furthermore, a dedicated receiver architecture is designed for LP-ASE-DMT, in which a low-complexity modulo operation is employed to eliminate the impact of constellation extension without incurring significant additional receiver complexity. The effectiveness of the proposed LP-ASE-DMT scheme is validated through simulation, revealing a substantial mitigation of PAPR compared to its counterparts. This improvement notably strengthens the system's robustness to nonlinear impairments. Consequently, LP-ASE-DMT enjoys superior performance across multiple metrics, including bit error rate (BER), power efficiency, and spectral efficiency.
在光无线通信（OWC）领域，增强频谱效率离散多音（ASE-DMT）因其出色的频谱效率和高功率效率而被广泛认为是一种很有前途的调制方式。然而，ASE-DMT具有固有的高峰均功率比（PAPR），这会加剧误码传播，并导致ASE-DMT的连续干扰消除（SIC）接收机的传输性能大幅下降。因此，本文提出了一种新颖的低PAPR ASE-DMT方案（LP-ASE-DMT）。鉴于ASE-DMT复杂的多深度信号叠加，开发了一种渐进式多级星座扩展算法，以有效抑制发射信号的PAPR，同时与传统星座扩展方案相比，实现更低的计算复杂度。此外，还为LP-ASE-DMT设计了一种专用接收机架构，其中采用低复杂度的模运算来消除星座扩展的影响，而不会带来显著的额外接收机复杂度。通过仿真验证了所提出的LP-ASE-DMT方案的有效性，结果表明与同类方案相比，PAPR得到了大幅降低。这一改进显著增强了系统对非线性损伤的鲁棒性。因此，LP-ASE-DMT在包括误码率（BER）、功率效率和频谱效率在内的多个指标上具有卓越的性能。
