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    科学领域:

    • 光学通信是指光学通信.
    • 信号处理 信号处理
    • 信息理论 信息理论

    背景情况:

    • 超宽带 (UWB) 技术提供高速,低功耗传输,但面临着波长分割多重复合 (WDM) 的整合挑战.
    • 轨道角动量 (OAM) 复杂化增加了UWB系统的容量密度,但在少数模式纤维 (FMF) 中遭受了模式间交叉声波,降低了性能.
    • 现有的方法在先进的通信系统中努力平衡高容量与信号完整性.

    研究的目的:

    • 提出和验证一种结合概率振幅塑造 (PAS) 和OAM多重复合UWB系统的新方案.
    • 为了减轻模式间交叉通话,并提高FMF传输中的信号质量.
    • 为了提高整体通信能力密度和接收器灵敏度.

    主要方法:

    • 整合概率振幅塑造 (PAS) 使用常量组成分布匹配器 (CCDM) 和低密度平价检查 (LDPC) 编码用于联合塑造和错误校正.
    • 应用离散里埃转换 (DFT) 预编码,在子载波中等同信号噪声比 (SNR),并抑制高峰到平均功率比 (PAPR).
    • 在FMF的5公里范围内进行4通道OAM多重复合UWB信号的实验传输.

    主要成果:

    • 通过使用拟议的PAS增强的OAM复合UWB系统,成功演示了1.89 x 4 Gbit/s的传输.
    • 与未成形的64-QAM信号相比,光学接收器灵敏度的显著改善 (在不同的符号速率下为7.5 dB,6.5 dB,6.0 dB).
    • 通过概率造型实现了额外的0.5dB的灵敏度增益,减少了高振幅符号的出现.

    结论:

    • 拟议的PAS方案通过减轻交叉通话和提高接收器灵敏度,有效地提高了OAM多联UWB系统的性能.
    • 这种方法为增加未来高速光通信网络容量密度提供了可行的解决方案.
    • 塑造和错误校正的联合优化,以及预编码技术,对于强大的信号传输至关重要.