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

作　　者：Jinxiang Liu Xiaotao Zhang Jun Yang Huiping Yang 

机构地区：[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 Normal University,Guangzhou 510631,China

出　　处：《Digital Communications and Networks》2024年第4期1189-1197,共9页数字通信与网络（英文版）

基　　金：supported by the National Natural Science Foun-dation of China under Grant 11901209,Grant 62374061,and Grant 62271217.

摘　　要：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.

关 键 词：Passive inter-modulation Frequency-division duplexing Nonlinear distortion Digital cancellation Spline interpolation Wiener-Hammerstein model 

分 类 号：TN929.5[电子电信—通信与信息系统]