宽带功率放大器的低计算复杂度数字预扭曲模型
Xu Lu1,2, Qiang Zhou2, Lei Zhu2
1School of Electronics and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210007, China.
Sensors (Basel, Switzerland)
|November 9, 2024
概括
一个新的组合分片记忆多项式 (CPMP) 模型通过分割信号来增强功率放大器 (PA) 线性化. 这种数字预扭曲技术显著减少了非线性和内存效应,改善了相邻通道功率比 (ACPR).
科学领域:
- 电气工程 电气工程
- 信号处理 信号处理
- 电信 电信服务 电信服务 电信服务
背景情况:
- 宽带功率放大器 (PA) 遭受严重的非线性和强大的内存效应,降低信号质量.
- 现有的数字预扭曲模型很难有效地解决这些复杂的PA特性.
研究的目的:
- 提出一种新的组合零碎记忆多项式 (CPMP) 数字预扭曲模型.
- 提高线性化性能,减少宽带PA中的计算复杂性.
主要方法:
- 开发了一个基于向量交换 (VS) 行为模型的CPMP模型.
- 根据PA非线性扭曲特征,将输入信号封面值分割为三个段.
- 对于每个细分市场,采用不同的多项式模型 (GMP,MP,高阶GMP),共享一个基本的MP.
- 配置了每个段的不同的交叉项,内存深度和多项式顺序.
主要成果:
- 在相邻通道功率比 (ACPR) 中实现了显著的改善,从-36dBc降至-54dBc.
- 性能与通用记忆多项式 (GMP) 模型相匹配,并以0.5dBc超过了逐步动态偏差减少 (PDDR) 和分解向量旋转 (DVR) 模型.
- 将参数提取的计算复杂度降低至28.8% (DVR),21.79% (GMP) 和12.83% (PDDR).
结论:
- 拟议的CPMP模型有效地将宽带PA线性化,具有严重的非线性和记忆效应.
- 分段式方法提供了优越的线性化性能,并大大降低了计算复杂性.
- 该模型为现代通信系统中先进的数字预变形提供了一个有前途的解决方案.
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