Broadband beam steering for misaligned multi-mode OAM communication systems  

作　　者：TIAN Zhengjuan CHEN Rui LONG Wenxuan ZHOU Hong MORETTI Marco 

机构地区：[1]School of Communication Engineering,Xidian University,Xi’an 710071,China [2]Department of Information Engineering,University of Pisa,Pisa 56126,Italy

出　　处：《Journal of Systems Engineering and Electronics》2021年第4期779-788,共10页系统工程与电子技术（英文版）

基　　金：supported by the Natural Science Basic Research Program of Shaanxi(2021JZ-18);the Natural Science Foundation of Guangdong Province of China(2021A1515010812);the Open Research Fund of National Mobile Communications Research Laboratory,Southeast University(2021D04);the Fundamental Research Funds for Central Universities,and the Innovation Fund of Xidian University。

摘　　要：Orbital angular momentum(OAM)at radio frequency(RF)has attracted more and more attention as a novel approach of multiplexing a set of orthogonal OAM modes on the same frequency channel to achieve high spectral efficiency(SE).However,the precondition for maintaining the orthogonality among different OAM modes is perfect alignment of the transmit and receive uniform circular arrays(UCAs),which is difficult to be satisfied in practical wireless communication scenarios.Therefore,to achieve available multi-mode OAM broadband wireless communication,we first investigate the effect of oblique angles on the transmission performance of the multi-mode OAM broadband system in the non-parallel misalignment case.Then,we compare the UCA-based RF analog and baseband digital transceiver structures and corresponding beam steering schemes.Mathematical analysis and numerical simulations validate that the SE of the misaligned multi-mode OAM broadband system is quite low,while analog and digital beam steering(DBS)both can significantly improve the SE of the system.However,DBS can obtain higher SE than analog beam steering especially when the bandwidth and the number of array elements are large,which validates that the baseband digital transceiver with DBS is more suitable for multi-mode OAM broadband wireless communication systems in practice.

关 键 词：orbital angular momentum(OAM) uniform circular array(UCA) broadband wireless communication MISALIGNMENT beam steering 

分 类 号：TN925[电子电信—通信与信息系统]