In this paper,we consider a full-duplex(FD)millimeter wave(mmWave)multiuser integrated access and backhaul(IAB)system with massive MIMO,and the system asymptotic performance and interference cancellation schemes are investigated.First,the asymptotic performance of the IAB sys-tem with massive MIMO is analyzed.As the num-ber of macro base station(MBS)and small base sta-tion(SBS)antennas approaches infinity,the FD self-interference(SI),inter-tier interference and noise can be eliminated,which means that only multiuser inter-ference remains in the system.Then,multiuser in-terference can be suppressed by the base band(BB)precoders.Since all interference and noise are sup-pressed,the spectral efficiency of the SBS and users are infinite in theory.Then,two interference sup-pression precoding schemes are proposed.A block diagonalization(BD)-based interference cancellation scheme is designed based on the channel character-istics and null space projection.The FD SI,inter-tier interference and multiuser interference are elim-inated by BB precoders.Instead of eliminating inter-ference completely,a signal to leakage and noise ra-tio(SLNR)-based precoding scheme is derived to sup-press both interference and noise.By utilizing the Rayleigh-Ritz theorem,the SLNRs of the SBS and users are optimized.Simulation results show that all the interference can be effectively eliminated by the BD-based scheme at the cost of spectral efficiency per-formance loss,while the SLNR-based scheme can bal-ance interference and noise and achieve higher spec-tral efficiency with comparatively low interference level.Therefore,the BD-based scheme is more suit-able for interference elimination cases,and the SLNR-based scheme can improve the system performance in low interference scenarios.

Yi Zhang;Shuai Han;Weixiao Meng;Xunan Li;Yue Chen

Communications Research Center,Harbin Institute of Technology,Harbin 150001,China;National Computer Network Emergency Response Technical Team/Coordination Center of China,Beijing 100000,China

中国通信（英文版）

[1]Yi Zhang;Shuai Han;Weixiao Meng;Xunan Li;Yue Chen-.Asymptotic Analysis and Precoding Design of Integrated Access and Backhaul in Full-Duplex mmWave Networks)[J].中国通信（英文版）,2022(05):24-45

Precoding,Backhaul,multiuser,backhaul,precoders,SLNR,SLNRs

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