1、3G CDMA - WCDMA and cdma2000,Rodger E. Ziemer IEEE Communications Society Distinguished Lecturer Program,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,2,Rules for Efficient Multiple Access,Three laws Know the channel Minimize interference to others Mitigate interference received from others
2、Requirements of wireless multiple access Channel measurement Channel control and modification Multiple user channel isolation,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,3,Why CDMA?,Higher capacity Improved performance in multipath by diversity Lower mobile transmit power = longer battery
3、life Power control Variable transmission rate with voice activity detection Allows soft handoff Sectorization gain High peak data rates can be accommodated Combats other-user interference = lower reuse factors,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,4,What is Third Generation? 1,Flexib
4、le support of multiple services Voice Messaging email, fax, etc. Medium-rate multimedia Internet access, educational High-rate multimedia file transfer, video High-rate interactive multimedia video telecon-ferencing, telemedicine, etc. Mobility: quasi-stationary to high-speed platforms Global roamin
5、g: ubiquitous, seamless coverage Evolution from second generation systems,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,5,W-CDMA Versus cdma2000 2,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,6,WCDMA Uplink Frame Structure 1,DPDCH,I: data channel,Q: sync & control,DPCCH,Pilot:,TFCI,
6、FBI,TPC,TFCI = transmit format combination indicator FBI = feedback information TPC = transmit power control,DPDCH = dedicated physical data channel DPCCH = dedicated physical control channel,slot 0,slot 1,slot i,slot 14,radio frame = 10 ms,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,7,WCD
7、MA Uplink Modulator Structure 1,pulse shape filter (SRC),pulse shape filter (SRC),DPDCH1,DPDCH2,DPDCH3,DPCCH,I,Q,+,+,+,-,+,+,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,8,Orthogonal Variable Spreading Factor Codes,Cd, i selected from this tree,Notes: 1) For fixed chip rate, desired informa
8、tionrate determines length of spreadingsequence and therefore processing gain. 2) When a specific code is used, no other code on the path from that code to the root and or on the subtree beneath that code may be used. 3) All the codes at any depth into the treeare the set of Walsh Sequences. 4) Code
9、 phase is synchronous withinformation symbols. 5) FDD UL processing gain between 256 and 4FDD DL processing gain between 512 and 4TDD UL/DL processing gain between 16 and 1 6) Multicode used only for SF = 4,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,9,WCDMA Downlink Frame Structure 1,DPDC
10、H,DPCCH,TFCI,Pilot,TPC,slot 0,slot 1,slot i,slot 14,radio frame = 10 ms,DPDCH,DPCCH,Data1,Data2,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,10,WCDMA Downlink Modulator Structure 1,pulse shape filter (SRC),Primary Sync Code,Secondary Sync Code,sum,dedicated traffic channelsprimary & seconda
11、ry common pilot channelsprimary & secondary common control channelsother channels,s/p,s/p,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,11,Transmit Diversity Strategy for Downlink,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,12,cdma2000 Uplink Frame Structure,Bits/ Frame 16 40 80 17
12、2 350 744 1512 3048 6120,CRC bits 6 6 8 12 16 16 16 16 16,tailbits 8 8 8 8 8 8 8 8 8,Data Rate kbps 1.5 2.7 4.8 9.6 19.2 38.4 76.8 153.6 307.2,Code Rate 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/4 1/2,Repeats 16 8 4 2 1 1 1 1 1,Delete 1 of 5 1 of 9 none none none none none none none,Symbols 1536 1536 1536 1536
13、1536 3072 6144 12288 12288,Radio Configuration 3,C.S.0002-A-1 Fig 2.1.3.1.1.1-8,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,13,cdma2000 Uplink Modulator,C,C,C,A,B,+,+,+,+,+,_,sum,sum,Primary Traffic,Secondary Traffic 1,Secondary Traffic 2,Control,Pilot,pulse shape,pulse shape,May 28-June1,
14、 2001,R. Z. Ziemer, Colorado Springs, CO,14,cdma2000 Downlink Frame Structure,Other similar tables in specification.,Bits/ Frame 21 55 125 267 552 1128 2280 4584 9192 20712,CRC bits 6 8 10 12 16 16 16 16 16 16,tailbits 8 8 8 8 8 8 8 8 8 8,Data Rate kbps 1.8 3.6 7.2 14.4 28.8 57.6 115.2 230.4 460.8 1
15、036.8,Code Rate 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2,Repeats 8 4 2 1 1 1 1 1 1 1,Delete none none none none none none none none none 2 of 18,Symbols 576 576 576 576 1152 2304 4608 9216 18432 36864,Radio Configuration 9,W,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,15,cdma2000 1X DL Modu
16、lation Processing,+,long code,long code mask,0 1 1 -1,channel gain,fwd pwr ctrl gain,power control symbol puncture,DEMUX,decimate,pwr ctrl bit pos,I/Q scrambling bit extract,power control bits,puncture timing 800 Hz,W,YQ,YI,C.S.0002-A-1 Fig 3.1.3.1.1.1-18,modulation symbol rate,May 28-June1, 2001,R.
17、 Z. Ziemer, Colorado Springs, CO,16,cdma2000 1X Downlink Modulation,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,17,cdma2000 3X DL Modulation Processing,+,long code,long code mask,0 1 1 -1,channel gain,fwd pwr ctrl gain,power control symbol puncture,DEMUX,decimate,pwr ctrl bit pos,I/Q scram
18、bling bit extract,power control bits,puncture timing 800 Hz,W,YQ1,YI1,modulation symbol rate,YQ2,YI2,YQ3,YI3,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,18,cdma2000 3X Downlink Modulation,same as below,same as above,output carrier 1,output carrier 2,output carrier 3,YQ1,YI1,YQ2,YI2,YQ3,YI3
19、,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,19,cdma2000 vs WCDMA,Chip rate Coherent Pilot Channels Transmit Diversity Underlying Network Single Carrier versus Multicarrier Spreading Cell Site Synchronization,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,20,References,1 R. L. Peter
20、son, “Third Generation Personal Communications: Physical Layer Status,” Presentation at Clemson University, Feb. 1, 2001 2 Manjit Singh and Manoneet Singh, “3G Wireless with Respect to IMT-2000 and Beyond,” Telecom 99 3 Harri Holma and Antti Toskala, WCDMA for UMTS: Radio Access for Third Generation
21、 Mobile Communications, New York: Wiley, 2000 4 “CDMA Evolution from IS-95, IS-2000, to 1XTREME,” Technology Transfer Training Class, Motorola, Inc., July 2000 5 R. Ziemer and R. Peterson, Introduction to Digital Communications, Upper Saddle River, NJ: Prentice Hall, Chapter 10, 2001,May 28-June1, 2
22、001,R. Z. Ziemer, Colorado Springs, CO,21,WCDMA: More Information?,http:/www.3gpp.org 21.101 guide to all other documents 25.XXX series radio access network (RAN) 25.211 frame structure etc. 25.212 channel coding etc. 25.213 spreading and modulation 25.214 physical layer procedures (tx diversity, et
23、c.) 25.321 medium access control (MAC) 25.322 radio link control (RLC) 26.XXX series voice coding,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,22,GSM/GPRS/EDGE: More Information?,http:/www.3gpp.org,May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,23,cdma2000: More Information?,http:/ww
24、w.3gpp2.org Technical Specification Group C cdma2000 C.S0002-A-1 Physical Layer Standard C.S0003-A-1 Medium Access Control (MAC) C.S0004-A-1 Signaling Link Access Control C.S00024 1XEV-DO (high speed packet) C.S0005 Upper Layer Signaling (L3),May 28-June1, 2001,R. Z. Ziemer, Colorado Springs, CO,24,
25、3G Information Sources,Third Generation Partnership Projects http:/www.3gpp.org http:/www.3gpp2.org CDMA Development Group (CDG) http:/www.cdg.org International Mobile Telecommunications for the year 2000 http:/www.tiaonline.org/standards/sfg/imt2k/ Japan ARIB IMT-2000 proposal http:/www.arib.or.jp/IMT-2000/ARIB/Document/,
