Digital cancellation of multi-band passive inter-modulation based on Wiener-Hammerstein model

Jinxiang Liu ¹Xiaotao Zhang ²Jun Yang ¹Huiping Yang³

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作者信息

1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510641,China
2. Huawei Technologies Co.,Ltd,Dongguan 523808,China
3. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510641,China;School of Electronic and Information Engineering,South China Normal University,Guangzhou 510631,China
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Abstract

Utilizing multi-band and multi-carrier techniques enhances throughput and capacity in Long-Term Evolution(LTE)-Advanced and 5G New Radio(NR)mobile networks.However,these techniques introduce Passive Inter-Modulation(PIM)interference in Frequency-Division Duplexing(FDD)systems.In this paper,a novel multi-band Wiener-Hammerstein model is presented to digitally reconstruct PIM interference signals,thereby achieving effective PIM Cancellation(PIMC)in multi-band scenarios.In the model,transmitted signals are independently processed to simulate Inter-Modulation Distortions(IMDs)and Cross-Modulation Distortions(CMDs).Furthermore,the Finite Impulse Response(FIR)filter,basis function generation,and B-spline function are applied for precise PIM product estimation and generation in multi-band scenarios.Simulations involving 4 carrier components from diverse NR frequency bands at varying transmitting powers validate the feasibility of the model for multi-band PIMC,achieving up to 19 dB in PIMC performance.Compared to other models,this approach offers superior PIMC performance,exceeding them by more than 5 dB in high transmitting power scenarios.Additionally,its lower sampling rate requirement reduces the hardware complexity associated with implementing multi-band PIMC.

Key words

Passive inter-modulation/Frequency-division duplexing/Nonlinear distortion/Digital cancellation/Spline interpolation/Wiener-Hammerstein model

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出版年

2024

数字通信与网络(英文)

ISSN：

段落导航