1、cI|: 1001- 893X(2011)05- 0046- 05高效非均匀数字信道化及信号重建技术null王null 芳1,黄null 振2,陆建华1,2(1. bv0“,100084;2. bvt?t b,100084)Knull1:针对宽带接收机接收信号多,且信号在频谱上呈现非均匀分布的情况,提出了基于多相离散傅里叶变换(DFT)滤波器组和信号重建的高效非均匀数字信道化的设计方法b该数字信道化结构由分析和综合两部分组成,采用同一组原型滤波器系数,通过对原型低通滤波器的优化设计提高其带外衰减性能,以利用平行结构正交镜像滤波器组重建信号b与常用的并行数字下变频a多级多相DFT滤波器组两种非均
2、匀数字信道化方法运算量比较,该方法在信号重建失真很小的情况下具有高效性和可行性b1oM:宽带接收机;多相DFT;信号重建;数字信道化ms |:TN911. 7 null nullDS M : A null null doi: 10. 3969/j. issn. 1001- 893x. 2011. 05. 010Efficient Nonnulluniform Digital Channelizer andSignal Reconstruction TechnologyWANG Fang1, HUANG Zhen2, LUJiannullhua1,2(1. Department of Elect
3、ronic Engineering,Tsinghua University, Beijing 100084, China;2. School of Aerospace, Tsinghua University, Beijing 100084, China)Abstract:In view of the situation that the number of receiving signal in wideband receiver is large and signalspectrum distributes nonnulluniformly, a method of efficient n
4、onnulluniform digital channelizer based on polyphase filnullter banks and signal reconstruction is proposed in this paper. The digital channelizer is composed of both analnullyser and synthesizer with a same coefficient of prototype lownullpass filter, which is designed optimally to achievehigh stop
5、band attenuation, so that the parallel quadrature mirror filter banks can be used to reconstruct signal.Finally, the computational complexity of the proposed channelizer is compared with that of the parallel digitaldown conversion channelizer and multinullstage polyphase DFT(Discret Fourier Transfor
6、m) filter banks, it can beseen that the proposed method is more efficient and feasible with a little signal distortion.Keywords:wideband receiver; polyphase DFT; signal reconstruction; digital channelizer1nullnull3 qL l/, Y ro F l|,sYY ro =M qs /M |T,K q0 |b zl f /, l| z WM,C d ( s,i OM qMSvbnull46n
7、ull51 5 2011 M5/ Telecommunication EngineeringVol.51null No.5May 2011null l : 2011- 03- 11; :2011- 04- 06 “:国家重点基础研究发展规划(973计划)项目( 2007CB310601) ;国家科技支撑计划项目(2008BAH25B03) ;国家自然科学基金资助项目(61021001)FoundationItem:The National Basic Research Program of China (973 Program) ( 2007CB310601) ;The National Ke
8、y TechnologyRThe National Natural ScienceFoundation of China(No.61021001)d ( 3 Ei 3/M (Digital Down Converter, DDC)1, 2)M =M(DFT) ro F3 , -a| f , ? LCd ( , “) ) 9F79F,7 O ? aY| ts f b8I n l 2#r$ 4 MDFT ro F|yrd ( 3 !9ZEb2nullMDFT ro F|yd( 3null nullB|Vs ro |a. , VYV , =a8 ro ro py, | y4 8 ro FK |x (
9、 nT) |x(nT)“x( n- n0)T , MB% c,:x (nT)= cx(n- n0)T (1)L ! l|X(z) =cN|,N|WKl !Gmin, ro F| l z ( sK, K |y0M (K = 2M )b 2MY ro F4(Quadrature Mirror Filter banks, QMF) m1 U,h(n) Y ro ,k ro “ hk(n)= h(n)ejnullkn, nullk= 2nullk2M (2)m1null 2MY ro FZFig.1 Structure of 2M channel QMF in Z domain2MY ro F9 1“
10、4X (z) = 1M nullM- 1l= 0X(zWlM) null2M- 1k= 0Hk(zWlM)Gk(z) (3)T, WM= e- j2nullMb T(2):Hk(z)= H(zWk2M), k= 0,1, null,2M- 1 (4)|Gk(z)= MH(zWk2M), k= 0,1, null,2M- 1 (5)| T(4)a T(5) T(3):X (z) = nullM- 1l= 0 null2M- 1k= 0H(zW2l+ k2M )H(zWk2M)X(zWlM) (6)H (z) qnull/ M,L ! :H(ejnull) null0, nullM null nu
11、llnull null (7)W2M- 12M = W- 12M V:X (z) null null2M- 1k= 0H(zWk2M) null1l= - 1H (zW2l+ k2M )X(zWlM) (8) T(8) V, ro HkHk+ 1WV| ro HkHk- 1WV| | 3 ,s ?$ hb X f /, T ro h(n) 3f 5 V y;B f /, ro F y,y7 rzy ?,1 !9E h rob r E 5 !9 ro, !9r q OE hvb| T(3)X (z) = 1MX(z) null2M- 1k= 0Hk(z)Gk(z)+1M nullM- 1l= 1
12、X(zWlM) null2M- 1k= 0Hk(zWlM)Gk(z) (9)T,B14 |s,=sb|y,1 h“=bL!i| zS nullli, nullui ,0|Nli= nullMnulllinull nullNui = nullMnulluinull null ( 10)T,nullnullnullV U_/ |, nullnullnullV U_ |bi| Mi = Nui - Nli + 10, 7nulli =(Nli mod 2)bL !4 |i|,|m1T m2 U,ss B ro |WF ;8si|),| (- 1)nk 6 , nV U|“|, kV U0|, Tnu
13、lli= 0,5 8 ro FG0(z), G1(z), null, GNui - Nli(z)|y; Tnulli= 1,5 8 ro FG1(z), G2(z), null, GNui - Nli+ 1(z)|ybi|Vm2 U“d |Yi(z) VV UYi(z) = 1M nullM- 1l= 0X(zWlM) null nullNui- Nli+ nullik= nulliHk+ Nli- nulli(zWlM)Gk(z)( 11)null47null5 null nullY:rd ( 3#|y/ 9270 m2 ro !92ML,| ro “ h(n)Ms, 2M , LMs ro
14、 b | , =“drM 4,6MDFT ro F|yd ( 3r m3 U,ss8sFbss| l, |aM ro#IDFTF;8s|y,DFTaM ro# =Fbss8sM ro B ro “ bIDFTDFTsYIFFTFFT LC,49 r qbm2null4 |i| mFig.2 Schematic diagram of extracting the ithchannel from the input signalsm3nullMDFT ro F|yd ( 3rFig.3 Structure of efficient non- uniform digital channelizerb
15、ased on polyphase filter banks and signal reconstructionm3 Uri|ssM |,8sM i =,Mi| M/M i |,y7 y|Xi(z) VV UXi(z) = M iM2 W(Qli- nulli)N- 122M nullnullMM i- 1q= 0 nullM- 1l= 0X(zM iMWl+ qM iM ) nullnullQui - Qli+ nullik= nulliHk(zM iMWl+Qli- nulli2 + qM iM )Gk(zM iMWqM iM ) ( 12) ro E qnull/ M H |Kv h7
16、,K f /null/ M =Gmin/2 OM= 2R( R ) ,y7ss T(13):2M= 2nulllb( 2nullGmin)null+ 1 ( 13)T| ts,5|ss(- 1)nkM |) 6 ,y|bssk M ro“ T(14) :Ek(z) = nullL- 1r= 0h(k+ 2Mr)z- r ( 14)T| ts,51y|,8sFFT 2M i T(15) ,8spM ro“ T(16) , Mii|0 “, 2M i Mi,SFFT H Mi| (2M i- Mi)0b2M i= 2null lb Minull ( 15)E(M i)p (z) = EpMMi(z
17、) = nullL- 1r= 0h(p MM i+ 2Mr)z- r ( 16)3null sL ! |,“ qfs, l z=iN|,Kl WGminb)| Cd ( s,7 Oy|i ? S| M, Wi a ,yN 4 s bB| (Signal Distortion, SD)$ iDDCa)MDFT ro F# MDFT ro F|y3d ( 3ZE Y 1 ,d9 H1 I n L E(Real MultiplicationsPer Second, RMPS) 1,8b D 5 T(1),| lnullSD = - 10 null lgnull x2(nT)null 1cx (nT)
18、- x(nT)2( 17)null48nullwww.teleonline. cn/ null null null null 2011 M3.1 nullMDFT ro F|yd ( snull null| l zs2M,ss 1 2MIFFTs ro F, 2MIFFT LQ 4M lb(2M)- 4Mfs/ M(RMPS) ,Ms ro F LQ (4LM)fs/ Mb8s 1 8ro F2M iFFT, 2M iFFT LQnull inull 0,1, null,N-14M i lb(2M i)- 4M ifs/ M(RMPS) ,4 |N| 4fs(L + lbM+ 1M nulli
19、 null 0, 1, null, N- 1(M i lbM i) +LM nulli null 0, 1, null,N- 1M i)(RMPS) (18)null Ni= 1M i null 2M,M i null M , KvCmax= fs null(12L+ 8+ 12 lb M) (19)3.2 nulliDDCd ( s 1 FIR ro ,4 |N| 2fsP nullNi= 1nullui - nullli2null (20)T,P ro , nullui - nulllii| zb D7, ro P :P= nullSD - 132. 324Gmin (21)3.3 nul
20、l)MDFT ro Fd ( snull null T(22) %, Bjj|z, 2MjV Uj)MDFT ro F , 1 2MjIFFTM ro F, 8 s I3. 1b2Mj= 2nulllb(2nullBj )null (22)4null_ L r E5 !9 ro, “ 9F ro E h f m4 Ub Z1 ro 2 QZ,m4S:null + nullsYA U64a128256 ro | sY- 32. 112 3 dBa- 55. 797 9 dB- 89. 607 5 dBb| I n | ,256 ro bm4 nullE ha| ro 1“mFig.4 Stopb
21、and attenuations and signal distortionversus length of prototype filterL !QPSK|,“ qfs = 160 MHz, 55MHz,| q20 MHzb| l zBB q0, 2nullS =s320, m5 U,0,nullS =i160,M #050%,| ts,9 140b256 V LCBBY q1/32aEh- 95 dBY ro bm5 null | ro FsFig.5 Distribution of the input signal in the filterbanksL !0, 2nullS =i4 z
22、0null15null|(/e|1), 4 z0null12null|(/e|2),Kl WGmin0null125null,“ qfsbB| S- 89. 607 5 dB,m61 iDDC )MDFT ro F | M f b, T(13) VM= 16,L = 8b0Y z2null/ (2M) = 0null062 5nullb|12null lb(0. 15null/ 0.0625null)null= 40,M 1= 2;null49null5 null nullY:rd ( 3#|y/ 9270 ,|2M 2= 1; T(19) V Kv152fsbiDDC, T( 21) VP
23、=32null963 6/ Gmin, T( 13) , VP null 5. 246 3M null84, T( 20) V9 90null72fsb )MDFT ro F,B):|1, T(21)P null 84, |P= 2null lb84null= 128, T( 22) !92M1= 8,5M1= 4, L1=16, 4fs(L1+ lbM1)= 72fs;=):|2, M2= 8, L2= 8, 4fs(L2+ lbM2)= 44fs;) 9 116fsbm6null 1Fig. 6 Comparison of the computational complexityV A,
24、E | 9F 9 t ,iDDC | 9FL9 t ,7) | M7M, ) ) 9F79F,| v6 H, !9ZE liDDC b “| 9F, !9ZE|C v b5nullnull rd ( “S, MDFT ro F|yrd ( 3, w#_ L ZE V,| f /, !9ZE l a 2 V Z, X X v a ( s K, !9E h ro V|y e lS; H, E M ro9 ) L H,d a z lb ID: 1 null Kambiz C Zangi,David R Koipillai. Efficient Filterbank Channullnelizers
25、for Software Radio ReceiversC/ /Proceedings of 1998IEEE International Conference onAcoustics,Speech and SignalProcessing.Seattle,WA ,USA:IEEE,1998:3497- 3500.2 null Lee Pucker. Channelization Techniques for Software DefinedRadio C / Proceedings of 2003 IEEE International Confernullence on Spectrum S
26、ignal Processing. Burnaby, Canada:IEEE, 2003:17- 19.3 null Fung C Y, ChanS C. A Multistage Filterbank- Based Channullnelizer and Its Multiplier- less Realization C / Proceedingsof 2002 IEEE International Symposium on Circuits and Sysnulltems. Phoenix- Scottsdale,Arizona :IEEE, 2002:429- 432.4 null(
27、,f ,.“ q 3|) #M.: bv,2007:55- 63,108- 126.TAO Ran,ZHANGHui- yun,WANG Yue.Theories and applinullcations of Multirate Digital Signal ProcessingM .Beijing:Tsnullinghua University Press,2007:55- 63,108- 126( in Chinese)5 null Hua Xu, Wu- Sheng Lu,Andreas Antoniou. Efficient IterativeDesignMethod for Cos
28、ine- Modulated QMF Banks J . IEEETransactions on Signal Processing,1996,44(7):1657- 1668.6 null. 3 l/ D.:0 S/v,2006.YANG Jing. Research on Digital Receiving Techniques ofChannelization D. Chengdu: University of Electronic Scinullence andTechnology of China,2006. (in Chinese)7 null Wajih A Abu- Al- S
29、aud, Gordon L. Efficient WidebandChannelizer for Software Radio Systems Using Modulated PRFilterbanks J. IEEE Transactions on Signal Processing,2004, 52(10): 2807- 2820.8 null Kambiz C Zangi, David R Koilpillai. Software Radio Issuesin Cellular Base StationsJ . IEEE Journal onSelectedAreasin Communi
30、cations,1999,17(4) :561- 573.Te:nullY(1982null ), o, 1 ,2004 Mb +v V,C bv0“ V 3,1Z_|) ;WANG Fang was born in Pianguan, Shanxi Province, in1982. She received the B. S. degree from PLA Information Enginullneering University in 2004. She is now a graduate student.Her renullsearch direction is signal pr
31、ocessing.Email: wangf08 mails.tsinghua. null( 1969null ) , 3, i ,1Z_|) ;HUANG Zhen was born in Chongqing, in 1969. He is now anassociate research fellow.His research direction is signal processing.Email: huangzwmc.ee.tsinghua.edu. cndy( 1963null ) , 3, 2Y , q,1Z_ zLY/ aYbLU Jian- hua was born in Nantong, Jiangsu Province, in1963. He is now a professor. His research direction is widebandwireless communication technology and satellite communication,etc.Email: lujhwmc.ee.tsinghua. edu. cnnull50nullwww.teleonline. cn/ null null null null 2011 M
