Secure resource allocation against colluding eavesdropping in a user-centric cell-free massive multiple-input multiple-output system  

作　　者：Na LI Yuanyuan GAO Kui XU Xiaochen XIA Huazhi HU Yang LI Yueyue ZHANG 

机构地区：[1]College of Communication Engineering,Army Engineering University of PLA,Nanjing 210007,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2024年第4期500-512,共13页信息与电子工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62071485,61671472,and 62271503);the Natural Science Foundation of Jiangsu Province,China(Nos.20201334 and 20181335)。

摘　　要：We investigate the resource allocation problem of a cell-free massive multiple-input multiple-output system under the condition of colluding eavesdropping by multiple passive eavesdroppers.To address the problem of limited pilot resources,a scheme is proposed to allocate the pilot with the minimum pollution to users based on access point selection and optimize the pilot transmission power to improve the accuracy of channel estimation.Aiming at the secure transmission problem under a colluding eavesdropping environment by multiple passive eavesdroppers,based on the local partial zero-forcing precoding scheme,a transmission power optimization scheme is formulated to maximize the system’s minimum security spectral efficiency.Simulation results show that the proposed scheme can effectively reduce channel estimation error and improve system security.

关 键 词：CELL-FREE Colluding eavesdropping Limited pilot resources Access point selection Security rate 

分 类 号：TN929.5[电子电信—通信与信息系统]