智慧教室间交互通信网络变速跳频信号分选算法  

Variable Speed Frequency Hopping Signal Sorting Algorithm for Intelligent Classroom Interactive Communication Network

作　　者：徐以章 王佳培 叶润潮 XU Yizhang;WANG Jiapei;YE Runchao(The Training Center of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]国网浙江省电力有限公司培训中心,浙江杭州310000

出　　处：《微型电脑应用》2024年第11期272-276,共5页Microcomputer Applications

摘　　要：为了保障智慧教室间交互通信网络的流畅通信,研究智慧教室间交互通信网络变速跳频信号分选算法,以提高智慧教学质量。通过短时傅里叶变换(STFT)方法,转换包含网络变速跳频源信号与噪声信号的混合信号至时频域,结合自适应阈值去噪方法,去除时频域混合信号内噪声。获得去噪后时频域混合信号经帧重叠构建后,获得数帧重叠帧混合信号。盲源分离重叠帧混合信号后,得到数帧重叠帧分离变速跳频信号,经重叠率对比后,去除同源信号重叠部分,拼接剩余部分获得同源分选变速跳频信号。结果显示:该算法应用于智慧教室间交互通信网络中,可转换网络初始混合信号至时频域,实现混合信号的稀疏化呈现;可有效消除时频域混合信号内噪声,为去噪后时频域混合信号构建数帧重叠帧信号,对此类信号实施有效分离,得到重叠帧分离变速跳频信号,并以此为依据最终完成同源变速跳频信号的分选。Variable speed frequency hopping signal sorting algorithm is studied for intelligent classroom interactive communication networks to ensure smooth communication between intelligent classroom interactive communication networks,and improve the quality of intelligent teaching.Using the short time Fourier transform(STFT),the mixed signal containing the network variable speed frequency hopping source signal and noise signal is converted to the time frequency domain,and combined with an adaptive threshold denoising method,the internal noise in the time frequency domain mixed signal is removed.After the denoised time-frequency domain mixed signal is constructed by frame overlap,a multi-frame overlap frame mixed signal is obtained.After blind source separation of overlap frame mixed signals,a multi-frame overlap frame separated variable speed frequency hopping signal is obtained.By comparing the overlap rates,the overlap portions of the same source signals are removed,and the remaining portions are spliced to obtain the same source sorted variable speed frequency hopping signals.This algorithm is applied to the interactive communication network between smart classrooms,the application result shows that it can convert the initial mixed signal of the network to the time frequency domain,achieve the sparse representation of the mixed signal,effectively eliminate the noise in the time frequency domain mixed signal,construct several frames of overlap frame signals for the denoised time frequency domain mixed signal,and effectively separate such signals to obtain overlap frame separated variable speed frequency hopping signals.Based on this,the sorting of the same source variable speed frequency hopping signals is finally completed.

关 键 词：智慧教室 交互通信网络 变速跳频信号 自适应去噪 盲源分离 帧重叠 

分 类 号：TN911[电子电信—通信与信息系统]