基于自适应内存长度查找表 (LUT) 的数字预变形,用于IM/DD水下无线光通信
Optics express
|March 5, 2024
概括
使用自适应内存长度查找表 (AML-LUT) 的新数字预变形方法显著降低了水下光学无线通信 (UOWC) 系统的复杂性. 这种方法实现了高性能与减少内存大小为4级脉冲振幅调制 (4-PAM) 信号.
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:
- 水下光学无线通信 (UOWC) 系统面临信号扭曲的挑战.
- 数字预扭曲 (DPD) 对于减轻强度调制和直接检测 (IM/DD) 系统中的非线性至关重要.
- 现有的DPD方法,如全尺寸查找表 (LUT) 和多符号简化查找表 (MSS-LUT),可能是复杂和内存密集的.
研究的目的:
- 提出并实验证明一种基于自适应记忆长度查找表 (AML-LUT) 的新型DPD方案.
- 评估基于AML-LUT的DPD在4级脉冲振幅调制 (4-PAM) UOWC系统中的性能和实施复杂性.
- 在性能和资源利用方面,比较拟议中的AML-LUT DPD与现有的DPD技术.
主要方法:
- 开发使用AML-LUT的DPD方案,其中内存长度根据模式进行自适应调整.
- 625 Mbit/s 4-PAM UOWC系统在1米传输线上的实验设置.
- 对AML-LUT DPD与全尺寸LUT (LUT-7) 和基于MSS-LUT的DPD进行评估,评估功率罚款和LUT尺寸减少.
主要成果:
- 基于AML-LUT的DPD在7%的硬决策前置错误校正 (HD-FEC) 和KP4-FEC值时实现了边际0.5dB的功率罚款.
- 与LUT-7 DPD相比,实施复杂性减少了93%,与MSS-LUT DPD相比,减少了89%.
- 通过显著降低复杂性和内存要求,实现了可比的传输性能.
结论:
- 拟议的基于AML-LUT的DPD为4-PAM UOWC系统提供了高效的解决方案.
- 这种方法显著降低了实现复杂性和内存足迹,而不会影响系统性能.
- 针对AML-LUT的DPD显示了未来高速,低复杂性和内存效率高的UOWC和短距离光学互连的巨大潜力.
相关概念视频
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Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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