在前向和反路径中使用减少的采样率进行功率放大器预扭曲.
Serien Ahmed1, Majid Ahmed1, Souheil Bensmida2
1Department of Electrical Engineering, College of Engineering, American University of Sharjah, Sharjah P.O. Box 26666, United Arab Emirates.
Sensors (Basel, Switzerland)
|June 19, 2024
概括
这项研究引入了用于无线通信的新型数字预扭曲技术,降低了前向和反路径的采样率. 这种方法可以实现显著的采样率降低,而5G信号的性能损失最小.
科学领域:
- 电气工程 电气工程
- 无线通信系统无线通信系统
- 信号处理 信号处理
背景情况:
- 下一代无线通信需要更高的数据速率,导致带宽利用率增加 (例如,5G NR中的400 MHz).
- 现有的数字预扭曲技术面临着高采样率要求的挑战,影响效率和实用性.
- 在先进的无线系统中,开发以较低的采样速率运行的预变形方法至关重要.
研究的目的:
- 介绍一种新的预扭曲技术,将处理分为数字和模拟领域.
- 为了降低数字预扭曲系统中前向和反路径的采样率要求.
- 为了实现高带宽无线通信的高效和实用的预扭曲解决方案.
主要方法:
- 开发了一种混合预扭曲方法,将模拟和数字领域结合起来.
- 模拟域包含一个没有内存的AM/AM增益函数.
- 数字领域使用具有记忆效应的非线性模型来弥补损伤.
- 样本率的降低同时应用于前进路径的DAC和反路径的ADC.
主要成果:
- 实验验证使用20 MHz和40 MHz的5G信号进行.
- 20MHz信号的采样率降低了50%,线性化退化最小.
- 对40MHz信号实现了30%的采样率降低,线性化退化最小.
- 拟议的技术有效地放松了采样率要求,而不会显著地影响性能.
结论:
- 这种新的混合预扭曲技术成功地降低了无线通信系统的采样率要求.
- 这种方法为在下一代无线标准 (如5G) 中实施高效的数字预变形提供了实际解决方案.
- 该方法证明了在减少采样率和线性化性能之间存在可行的权衡.
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