通过多目标优化提高基于OFDM的VLC系统的功率和光谱效率
概括
这项研究优化了使用常态包膜直角频率分割复杂化 (CE-OFDM) 的可见光通信 (VLC) 系统. CE-OFDM提高了频谱效率,并降低了信号噪声比要求,提高了数据传输可靠性.
科学领域:
- 光学通信是指光学通信.
- 信号处理 信号处理
- 无线网络 无线网络 无线网络
背景情况:
- 可见光通信 (VLC) 系统因发光二极管 (LED) 不线性而面临挑战.
- 由于这些非线性,VLC中的直角频率分割复杂化 (OFDM) 参数化是复杂的.
研究的目的:
- 在VLC系统中优化传输功率和频谱效率,用于VLC系统中的常规和常态封面 (CE) OFDM.
- 在不同的条件下评估比特错误率 (BER) 性能.
主要方法:
- 制定了一个多目标优化问题,以最大限度地提高传输功率和光谱效率.
- 为了优化,使用了非主导排序基因算法II (NSGA-II).
- 比特错误率 (BER) 被用作主要的性能指标.
主要成果:
- 信号噪声比 (SNR) 要求随着因调节间扭曲减轻而增加的防护频段而下降.
- 与传统的OFDM相比,VLC系统中的恒定外OFDM (CE-OFDM) 需要较低的SNR.
- 对于1x10-3的BER,CE-OFDM在6%的防护带下实现了4-QAM的约10.8dB和16-QAM的24dB.
结论:
- 对于VLC系统来说,CE-OFDM在SNR和光谱效率方面提供了显著的改进.
- 建议的优化策略有效地解决了基于OFDM的LED非线性挑战.
- CE-OFDM是提高未来VLC系统性能的一种有前途的技术.
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