一种多帧头联合自相关DTMB-A频谱感知算法  

DTMB-A spectrum perception algorithm based on DIPNAC

作　　者：黄云川 张超[1,2] 潘长勇 HUANG Yunchuan;ZHANG Chao;PAN Changyong(Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;Beijing National Research Center for Information Science and Technology,Beijing 100084,China)

机构地区：[1]清华大学电子工程系,北京100084 [2]北京信息科学与技术国家研究中心,北京100084

出　　处：《现代电子技术》2022年第8期1-5,共5页Modern Electronics Technique

基　　金：国家自然科学基金重点项目(61931015)。

摘　　要：为保障信息传输的可靠性,需通过频谱感知技术获得频谱空穴的实时信息,使数字电视系统得以正常接入空穴进行工作。针对现有感知算法感知效率低、在多径信道下的抗干扰性差等问题,文中提出一种多帧头联合自相关算法(DIPNAC)。该算法的创新性在于针对信号帧中的多载波伪随机序列(PN-MC),将不同帧头自相关的加权累积结果作为统计量,从而充分利用感知时间内的检测信息。仿真结果表明,当信噪比参数相同时,相比传统的两种算法,所提算法的性能有显著提升,并且在载波频偏和多径信道条件下具备良好的抗干扰特性,可为提高DTMB-A频谱感知的效率和拓宽其应用场景提供有力保障。In order to guarantee the reliability of information transmission,the spectrum sensing technology is demanded to obtain real-time information of spectrum holes to make the digital TV system connect to the hole to work normally. In allusion to the problems of existing perception algorithm,such as the low perception efficiency and poor anti-interference performance at the multipath channel,a different interval pseudo-noise autocorrelation(DIPNAC)algorithm is proposed. The innovation of the algorithm is that for the pseudo-noise multi-carrier(PN-MC)sequence in the signal frame,the weighted cumulative results of autocorrelation of different interval are used as statistics,so as to make full use of the detection information in specific time. The simulation results show that when the SNR parameters are the same,the performance of the proposed algorithm is significantly improved compared with the traditional two algorithms,and has good anti-interference performance under the conditions of carrier frequency offset and multipath channel,which can provide a strong guarantee for improving the efficiency of DTMB-A system spectrum perception and broadening its application scenarios.

关 键 词：频谱感知 多帧头联合自相关算法 多径信道 抗干扰性能 感知时间 载波频偏 仿真实验 

分 类 号：TN925-34[电子电信—通信与信息系统]