School of Computer and Electronic Information;
Nanjing Normal University;
Nanjing 210023;
China;
Haiying Enterprise Group Co.;
Ltd.;
Wuxi 214061;
China;
College of Ocean Science and Engineering;
Shandong University of Science and Technology;
Qingdao 266590;
China;
Institute of Acoustics;
Nanjing University;
Nanjing 210093;
China;
acoustic-vortex beam; beam alignment; orbital angular momentum(OAM)spectrum; least standard deviation; acoustic communication;