Rapid Phase Ambiguity Elimination Methods for DOA Estimator via Hybrid Massive MIMO Receive Array  

作　　者：Xichao ZHAN Zhongwen SUN Feng SHU Yiwen CHEN Xin CHENG Yuanyuan WU Qi ZHANG Yifan LI Peng ZHANG 

机构地区：[1]School of Information and Communication Engineering,Hainan University,Haikou 570228,China [2]School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Chinese Journal of Electronics》2024年第1期175-184,共10页电子学报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(Grant Nos.U22A2002 and 62071234);the Hainan Province Science and Technology Special Fund(Grant No.ZDKJ2021022);the Scientific Research Fund Project of Hainan University(Grant No.KYQD(ZR)-21008)。

摘　　要：For a sub-connected hybrid multiple-input multiple-output(MIMO)receiver with K subarrays and N antennas,there exists a challenging problem of how to rapidly remove phase ambiguity in only single time-slot.A direction of arrival(DOA)estimator of maximizing received power(Max-RP)is proposed to find the maximum value of K-subarray output powers,where each subarray is in charge of one sector,and the center angle of the sector corresponding to the maximum output is the estimated true DOA.To make an enhancement on precision,Max-RP plus quadratic interpolation(Max-RP-QI)method is designed.In the proposed Max-RP-QI,a quadratic interpolation scheme is adopted to interpolate the three DOA values corresponding to the largest three receive powers of Max-RP.To achieve the Cramer Rao lower bound,a Root-MUSIC plus Max-RP-QI scheme is developed.Simulation results show that the proposed three methods eliminate the phase ambiguity during one time-slot and also show low computational complexities.The proposed Root-MUSIC plus Max-RP-QI scheme can reach the Cramer Rao lower bound,and the proposed Max-RP and Max-RP-QI are still some performance losses 2–4 d B compared to the Cramer Rao lower bound.

关 键 词：Hybrid analog and digital Direction of arrival Massive hybrid multiple-input multiple-output Phase ambiguity Low computational complexity 

分 类 号：TN911.7[电子电信—通信与信息系统]