Zhao Yinan, Chen Chen, Zhong Xin, Cao Hailin, Liu Min, Lin Bangjiang, Savović Svetislav
Opt Express. 2024 Apr 8;32(8):13720-13732. doi: 10.1364/OE.521045.
In this paper, we propose and demonstrate enhanced orthogonal frequency division multiplexing with index modulation (OFDM-IM) schemes for bandlimited underwater visible light communication (UVLC) systems via geometric constellation shaping (GCS) and subblock interleaving. Specifically, two heuristic GCS approaches based on particle swarm optimization (PSO) and hybrid genetic algorithm-PSO (GA-PSO) algorithms are proposed to generate IM-preferable constellations. Moreover, a generalized interleaving technique is further proposed to overcome the low-pass effect of bandlimited UVLC systems, where an optimal step size can be obtained to perform subblock interleaving. Simulation and experiments are conducted to evaluate the performance of the proposed enhanced OFDM-IM schemes in bandlimited UVLC systems, where both OFDM with single-mode index modulation (OFDM-SM) and OFDM with dual-mode index modulation (OFDM-DM) schemes are considered. The experimental results demonstrate remarkable signal-to-noise ratio (SNR) gains of 1.3 and 1.9 dB for OFDM-SM and OFDM-DM in comparison to the benchmark schemes, respectively.
在本文中，我们提出并展示了用于带宽受限水下可见光通信（UVLC）系统的增强型带索引调制的正交频分复用（OFDM-IM）方案，该方案通过几何星座整形（GCS）和子块交织实现。具体而言，提出了基于粒子群优化（PSO）和混合遗传算法 - 粒子群优化（GA-PSO）算法的两种启发式GCS方法，以生成更适合索引调制的星座。此外，还进一步提出了一种广义交织技术，以克服带宽受限UVLC系统的低通效应，其中可以获得执行子块交织的最佳步长。进行了仿真和实验，以评估所提出的增强型OFDM-IM方案在带宽受限UVLC系统中的性能，其中考虑了单模索引调制的OFDM（OFDM-SM）和双模索引调制的OFDM（OFDM-DM）方案。实验结果表明，与基准方案相比，OFDM-SM和OFDM-DM的信噪比（SNR）分别显著提高了1.3 dB和1.9 dB。
