Cross-subcarrier precoder design for massive MIMO-OFDM downlink with symplectic optimization  

作　　者：Yuxuan ZHANG An-An LU Xiang-Gen XIA Xiqi GAO 

机构地区：[1]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 211100,China [3]Department of Electrical and Computer Engineering,University of Delaware,Newark DE 19716,USA

出　　处：《Science China(Information Sciences)》2025年第2期212-225,共14页中国科学(信息科学)(英文版)

基　　金：supported by National Natural Science Foundation of China(Grant Nos.62394294,62394290,62371125);Jiangsu Province Basic Research Project(Grant No.BK20192002);Jiangsu Province Major Science and Technology Project(Grant No.SBG2024000080);Fundamental Research Funds for the Central Universities(Grant No.2242022k60007);Key R&D Plan of Jiangsu Province(Grant No.BE2022067);Huawei Cooperation Project。

摘　　要：We propose a cross-subcarrier precoder design(CSPD)for massive multiple-input multiple-output(MIMO)orthogonal frequency division multiplexing(OFDM)downlink.This work aims to significantly improve the channel estimation and signal detection performance by enhancing the smoothness of the frequency domain effective channel.This is accomplished by designing a few vectors known as the transform domain precoding vectors(TDPVs),which are then transformed into the frequency domain to generate the precoders for a set of subcarriers.To combat the effect of channel aging,the TDPVs are optimized under imperfect channel state information(CSI).The optimal precoder structure is derived by maximizing an upper bound of the ergodic weighted sum-rate(WSR)and utilizing the a posteriori beam-based statistical channel model(BSCM).To avoid the large-dimensional matrix inversion,we propose an algorithm with symplectic optimization.Simulation results indicate that the proposed cross-subcarrier precoder design significantly outperforms conventional methods.

关 键 词：massive MIMO-OFDM cross subcarrier precoder design transform domain precoding vectors effective channel symplecticoptimization 

分 类 号：TN9[电子电信—信息与通信工程]