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arXiv 2402.09964eess.SP
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用于功率放大器行为建模与数字预失真的沃尔什域神经网络

Walsh-domain Neural Network for Power Amplifier Behavioral Modelling and Digital Predistortion

Cel Thys, Rodney Martinez Alonso, Antoine Lhomel, Maxandre Fellmann, Nathalie Deltimple, Francois Rivet, Sofie Pollin

AI总结:

本文针对沃尔什-哈达玛收发器架构的基带算法并行化问题,将基于神经网络的数字预失真算法适配到该架构,通过跨域知识蒸馏预训练实现了与正交方案相当的线性化性能,为全基带链适配低功耗超高带宽沃尔什收发器奠定基础。

摘要:

本文研究了神经网络(NN)非线性建模在沃尔什-哈达玛(Walsh-Hadamard)收发器架构中用于功率放大器(PA)线性化的应用。这种新型架构近期被提出用于超高带宽系统,通过数字基带硬件的大规模并行化降低收发器功耗。该并行化通过用多维沃尔什-哈达玛调制替代二维正交调制实现。该架构的开放研究问题是:传统基带信号处理算法能否在保持性能的前提下实现类似的并行化。本文将一项关键基带算法——即采用神经网络模型实现功率放大器线性化的数字预失真——适配到并行沃尔什架构中。研究对最先进的神经网络架构进行直接并行化,并加入跨域知识蒸馏预训练方法,使其线性化性能与正交实现相当。该结果为将整个基带处理链适配到超高带宽、低功耗的沃尔什收发器铺平了道路。

英文摘要:

This paper investigates the use of Neural Network (NN) nonlinear modelling for Power Amplifier (PA) linearization in the Walsh-Hadamard transceiver architecture. This novel architecture has recently been proposed for ultra-high bandwidth systems to reduce the transceiver power consumption by extensive parallelization of the digital baseband hardware. The parallelization is achieved by replacing two-dimensional quadrature modulation with multi-dimensional Walsh-Hadamard modulation. The open research question for this architecture is whether conventional baseband signal processing algorithms can be similarly parallelized while retaining their performance. A key baseband algorithm, digital predistortion using NN models for PA linearization, will be adapted to the parallel Walsh architecture. A straighforward parallelization of the state-of-the-art NN architecture is extended with a cross-domain Knowledge Distillation pre-training method to achieve linearization performance on par with the quadrature implementation. This result paves the way for the entire baseband processing chain to be adapted into ultra-high bandwidth, low-power Walsh transceivers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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