《OFDM跳频载波的抗干扰性能研究》由会员分享，可在线阅读，更多相关《OFDM跳频载波的抗干扰性能研究（3页珍藏版）》请在金锄头文库上搜索。
1、2532011M5v(1S)Jour nal of Shandong U niversit y of T echnolog y( Natur al Science Editio n)V ol. 25 N o. 3M ay 2011l: 2011-02-09:8Onull0/!T7Lunull( 0942 )Te:#,3, ratchet2000 qq. comcI|: 1672- 6197( 2011) 03- 0036- 03OFDMKoF?濮荣强1, 沈林放2( 1.芜湖信息技术职业学院电子信息系, 安徽芜湖 241000;2.浙江大学信息与电子工程学系, 浙江杭州 310027)Knul
2、l1: OFDM 跳频通信系统因跳频载波的频移易破坏其正交性而引入载频间的干扰ICI.采用MAT LAB研究了跳频载波的多径时延扩展频移产生的干扰信号能量, 及其对OFDM 跳频载波通信系统的影响, 并讨论了采用收a发伪随机序列码彼此滑动实现位同步来消除跳频载波载频频移的可行性.结果表明,增加跳频载波个数和减小伪随机序列码宽度可以有效地抑制载频间干扰信号能量.1oM: 跳频载波; 多径时延扩展; 载频偏移; 抗干扰性能ms|: TN916DSM: AStudies of the ant-i jamming performance of OFDMfrequency-hoppingcarriers
3、PU Rong-qiang1, SHEN Lin-fang2( 1. Department of Electronic Information, Wuhu Vocational College of Information Technology , Wuhu 241000, China;2. Department of Information Science and Electronic Engineering , Zhejiang U niversity, Hangzhou 310027, China)Abstract: Adjacent OFDM orthog onal frequenci
4、es in a hopping co mmunication sy stem w ill no t in-terfere w ith each other, thus the spectrum efficiency and effective com munication is g reatly im-prov ed. H o w ever, destr oying the o rtho gonality of OFDM carrier frequencies also intro duces aninter-car rier interference ICI. By making use o
5、f MA TLAB, this paper pr esents detailed studies onmultipath-delay spread interference sig nal g enerated by frequency shift and im pacting energy tothe OFDM frequency- hopping comm unicatio n system. By m aking the sending and receiv ing pseu-do- random sequence codes slide each other for achieving
6、 basic bit synchronizatio n, the sendingand receiving fr equency-hopping carr ier interference is w ell eliminated due to the carrier frequen-cy shift. And it is show n that by reducing the w idth of pseudo-random sequence code, the inter-ference betw een the carrier frequency signal energ ies can b
7、e effectively suppressed.Key words: frequency-hopping carriers; multipath-delay interference; carrier frequency-hoppingshift; ant-i jamm ing perform ancenull null OFDMKYdyM#Ko7M,V74Ydrq.Ko.,yNMFZF4?.,KoMOFDM,V7KoWICI 1 .s)OFDMKYd.+$,M AT LABW%KoyHZM3|?,#N|?OFDMKYdY,i)la?4NLC/,hKoyHZ/M.1 null OFDMKYV
8、Le.+null null OFDMKYdKo.1+.q.%5,5qVP e = nullkx = rCxk p x q k- xT: p = J/ Nkpq(.pq) , NK, J$; q= 1- pkpq(.pq) ; k?1+cKo; rP1+%HAKlKo.B1+5K?5%,M AT LAB_9,Tm1U.m1V,.?X 2 .m1 nullKdqM ATLAB_Tm1,KoKp106H,KYdLCVL. nK?3B=|32n- 1K,.=Cq,yNF?9(.5Kq45|z9v5N,vv4Kq,A9mF?.Shanno n,CMH,yCB17S/ N1,4zB19F-1S/ N?re
9、. OFDMKYdzM-4/,q5dr,.19F7q/.4Kq,d9yHZ/BBMnull,OFDM,NWICI,V7YFZF4h?.2 null OFDMKYdF?2. 1null.KW3MICI?!K.dOFDMK|a= a0, null, aN- 1 ,NdKo,5H|IDFTVVUbn = 1N nullN- 1k= 0akw - knNBBMnull/H|nullb k = ex p( j 2nullknullN ) bk ,LKo3 3cl = 1N nullN- 1i= 0nulli W- liN = 1N nullN- 1i= 0ej2nullN i (null+ l) =nu
10、ll ejnull(null+ l) sinnull(null+ l) ej nullN(null+ l) sin nullN (null+ l) null ejnull(null+ l) sinnull(null+ l) null(null+ l)Tnulli = exp( j 2nullinullN ) .NVn,C|?| cl - cl+ 1 | 2 = sinc2( nullnull) null( l + null) 2 + ( l + null) 2M AT LA BsLKo|?BBMnull1,Tm2U.m2null|?BBMnull1Vm2A,Ko3|?KoLQ1,yOFDMK|aiMM.MaivH,Ly apunovvV,null aiVs,y(aZMiQ1,Kov5Fnull ai3s(Zl,yNKoW3|?9.Vm29V,Ko3|?
