5 13 spread spectrum systems

... (GLOBECOM’ 95) , Singapore, pp 2 059 –2063, Nov 19 95 [ 15] Kaiser S., “Trade-off between channel coding and spreading in multi-carrier CDMA systems, ” in Proc IEEE International Symposium on Spread Spectrum ... pp 1 15 120, Sept 1998 [18] Kaiser S and Fazel K., “A spread- spectrum multi-carrier multiple-access system for mobile communications,” in Proc International Workshop on Multi-Carrier Spread- Spectrum ... Phoenix, USA, pp 13 65 136 9, May 1997 [27] Ross G.F., “The transient analysis of certain TEM mode four-post networks,” IEEE Transactions on Microwave Theory and Techniques, vol 14, pp 52 8 54 2, Nov 1966...

Ngày tải lên: 09/08/2014, 19:22

... Multi-Carrier Systems 6 .5 Software-Defined Radio 6 .5. 1 General 6 .5. 2 Basic Concept 6 .5. 3 MC-CDMA-Based Software-Defined Radio References 2 35 236 239 240 240 244 2 45 248 253 253 254 255 255 257 258 260 ... References ix 153 154 158 158 159 159 162 166 167 167 169 170 171 171 172 172 173 177 1 85 188 189 Applications 5. 1 Introduction 5. 2 Cellular Mobile Communications Beyond 3G 5. 2.1 Objectives 5. 2.2 Network ... in µs in dB in µs in dB 0 −3 −2 .5 0 0.1 −4 0.2 0.3 0.1 −1 .5 0.2 −8 0 .5 −2 1.0 −3 0.3 −4 .5 0.3 −12 1.6 −6 1.6 5 0 .5 −7 .5 0.4 −16 2.3 −8 5. 0 −2 15. 0 −8.0 0 .5 −20 5. 0 −10 6.6 −4 17.2 −17.7 Radio...

Ngày tải lên: 02/03/2013, 16:58

... Sequences For Spread- Spectrum Systems 453 0 .5 0 .5 Autocorrelation Autocorrelation −0 .5 10 15 20 Phase (chips) 25 30 −0 .5 35 PN-EB original Gold (31) 10 15 20 Phase (chips) 25 30 35 PN-EB original ... length around 250 New PN Even Balanced Sequences For Spread- Spectrum Systems 455 120 100 200 80 Gain (dB) 150 r of se Numbe quences 250 100 50 0.1 25 60 40 0. 25 Co rre lat 0.3 75 ion lev els 20 ... levels Correlation levels PN-EB original PN-EB Rees 0. 75 0.6 25 0 .50 78 19 0.3 75 189 219 0. 25 123 155 0.1 25 1 Total 396 396 0. 25 123 162 164 0.1 25 1 Total 396 396 396 Table 3: Improvement with the...

Ngày tải lên: 23/06/2014, 00:20

... estimating and suppressing narrow-band interference in PN spread- spectrum systems, ” IEEE Trans Communications, vol 30, no 5, pp 913 924, 1982 [5] R A Iltis and L B Milstein, “Performance analysis ... K Das, “Narrow-band interference excision in spread spectrum systems using lapped transforms,” IEEE Trans Communications, vol 45, no 11, pp 1444–1 455 , 1997 [8] A Pouttu, J K Juntti, and T J Kumpum¨ ... interference suppression in a hybrid DS/FHsystem,” in Proc IEEE 5th International Symposium on Spread Spectrum Techniques and Applications, pp 351 – 355 , Sun City, South Africa, September 1998 [9] P Henttu,...

Ngày tải lên: 23/06/2014, 01:20

... in µs in dB in µs in dB 0 −3 −2 .5 0 0.1 −4 0.2 0.3 0.1 −1 .5 0.2 −8 0 .5 −2 1.0 −3 0.3 −4 .5 0.3 −12 1.6 −6 1.6 5 0 .5 −7 .5 0.4 −16 2.3 −8 5. 0 −2 15. 0 −8.0 0 .5 −20 5. 0 −10 6.6 −4 17.2 −17.7 Radio ... 1-4 1.3 Spread Spectrum Techniques Spread spectrum systems have been developed since the mid-1 950 s The initial applications have been military antijamming tactical communications, guidance systems, ... , v = 0, , Nc − (1.28) n=0 10 spectrum of 1st sub-channel OFDM spectrum Power spectral density −10 −20 −30 −1 −0 .5 Figure 1 -5 Normalized frequency 0 .5 OFDM spectrum with 16 sub-carriers Multi-Carrier...

Ngày tải lên: 09/08/2014, 19:22

... PN spread spectrum systems, ” IEEE, Transactions on Communications, vol 30, pp 913 924, May 1982 [31] Kondo S and Milstein L.B., “On the use of multicarrier direct sequence spread spectrum systems, ” ... Communications Magazine, vol 26, pp 48 54 , June 1988 [13] Dixon R.C., Spread Spectrum Systems New York: John Wiley & Sons, 1976 [14] Engels M (ed.), Wireless OFDM Systems: How to Make Them Work Boston: ... Multi-Carrier and Spread Spectrum Systems K Fazel and S Kaiser  2003 John Wiley & Sons, Ltd ISBN: 0-470-84899 -5 (k) , where k may take on the values 0, , 50 MC-CDMA and MC-DS-CDMA (k) Figure 2-1 spreader...

Ngày tải lên: 09/08/2014, 19:22

... European Transactions on Telecommunications (ETT), vol 11, pp 55 5 56 5, Nov./Dec 2000 [43] Schnell M., Systeminh¨ rente St¨ rungen bei Spread- Spectrum -Vielfachzugriffsverfahren f¨ r die Mobila o u ... in Proc International Workshop on Multi-Carrier Spread- Spectrum & Related Topics (MC-SS 2001), Oberpfaffenhofen, Germany, pp 131 138 , Sept 2001 [13] Egle J., Reinhardt M and Lindner J., “Equalization ... Workshop on Multi-Carrier Spread- Spectrum & Related Topics (MC-SS 2001), Oberpfaffenhofen, Germany, pp 13 21, Sept 2001 [ 35] Nobilet S., Helard J.-F and Mottier D., “Spreading sequences for uplink...

Ngày tải lên: 09/08/2014, 19:22

... QPSK 1/2 2/3 3/4 5/ 6 7/8 3.1 4.9 5. 9 6.9 7.7 dB dB dB dB dB 3.6 5. 7 6.8 8.0 8.7 dB dB dB dB dB 5. 4 8.4 10.7 13. 1 16.3 dB dB dB dB dB 16-QAM 1/2 2/3 3/4 5/ 6 7/8 8.8 11.1 12 .5 13 .5 13. 9 dB dB dB dB ... information This leads to a much Channel Estimation 155 100 BU, km/h 10−1 TU, 30 km/h HT, 150 km/h BER RA, 250 km/h 10−2 10−3 10−4 10 Eb /N0 in dB 11 12 13 14 Figure 4-30 BER versus SNR of MC-CDMA with ... TH, 30 km/h HT, 150 km/h RA, 250 km/h −1 10−2 10−3 10−4 Figure 4-33 10 11 12 Eb /N0 in dB 13 14 15 16 BER versus SNR of SS-MC-MA with pilot symbol aided channel estimation 158 Implementation...

Ngày tải lên: 09/08/2014, 19:22

... bytes 0 .59 6 4 .5 dB (16, 15) (64 ,57 ) 106 bytes 0.834 6.2 dB (56 ,49)(32,26) 159 bytes 0.711 3.8 dB (49,42)(32,31) 159 bytes 0.827 6 .5 dB (43,42)(32,31) 159 bytes 0.9 45 8 .5 dB inputs or generate soft ... autocorrelation 176 Implementation Issues 0.20 0. 15 0.10 ΨE [rad] 0. 05 0.00 −0. 05 −0.10 −0. 15 −0.20 Figure 4 -52 10 15 20 OFDM symbol number 25 30 Mixed time/frequency representation of the total ... without pre-distortion 2.6 dB 4.0 dB 3.2 dB 4.7 dB 1. 25 dB 3.0 dB DS-CDMA without pre-distortion 5. 0 dB 5. 5 dB 5. 3 dB 5. 8 dB 0.9 dB 1.1 dB – 2 .5 dB – 3.1 dB – 0.9 dB Transmission scheme MC-CDMA...

Ngày tải lên: 09/08/2014, 19:22

... coincide) 153 6 Number of sub-channels 32 Number of sub-carriers per sub-channel 48 218 Applications Sub-carriers (frequency) n 26 13 52 OFDM symbols (time) n+1 52 15 n+2 52 17 n + 13 13 Fixed location ... Table 5- 13 OFDMA parameters for ETSI channelization with 2048 sub-carriers Bandwidth (MHz) Ts (µs) Tg (µs) 1. 75 1024 32 64 128 256 3 .5 512 16 32 64 128 256 16 32 64 14 128 16 32 28 64 16 Table 5- 14 ... Figure 5- 4 Multicarrier modulation (OFDM) IF/ RF D/A Two dimen variable spreading Generic architecture concept of NTT DoCoMo 5. 2.3 System Parameters 5. 2.3.1 Downlink As depicted in Figure 5- 5, by...

Ngày tải lên: 09/08/2014, 19:22

... 1/32 Ts α = 0. 25 1/2 3/4 1/2 3/4 1/2 0.66 0.99 1.32 1.98 1.98 0.69 1.03 1.37 2.06 2.06 0.83 1. 25 1.67 2 .50 2 .50 3/4 2.97 3.09 3. 75 1/2 2.63 2. 75 3.33 3/4 1/2 3. 95 5.27 4.12 5. 50 5. 00 6.67 3/4 ... 11 95 µs 0.837 kHz 11 95 µs 0.837 kHz RCT channel bandwidth 1.911 MHz 0.940 MHz 1.433 MHz 0.7 05 MHz Useful symbol duration Sub-carrier spacing 448 µs 2.232 kHz 448 µs 2.232 kHz 59 7 µs 1.674 kHz 59 7 ... spacing Rectangular 187 0.20944 s 0.10472 s 0. 052 36 s Nyquist w/o FH 1 95 0.2184 s 0.1092 s 0. 054 6 s Nyquist with FH 219 0.2 452 8 s 0.12264 s 0.0 6132 s Time Frequency Transmission frame type User...

Ngày tải lên: 09/08/2014, 19:22

... 254 – 255 ST block codes (STBC) 238–240 ST trellis codes (STTC) 237–238 UMTS 253 Spatial diversity 233 Spreading codes 52 54 PAPR 54 , 184–1 85 Spreading length 34, 49, 55 , 201 Spread spectrum 30– 45 Spread ... (PAPR) 54 55 , 178 Downlink PAPR 54 55 Uplink PAPR 54 Phase diversity 241–243, 2 45 247 Phase lock loop (PLL) 174 Phase noise 173–177 Effects 1 75 177 Modeling 173–1 75 Lorenzian power density spectrum ... OFDMA 99 Frequency synchronization 136 139 Coarse frequency synchronization 136 138 CAZAC/M sequence 137 Schmidl and Cox, 137 138 Fine frequency synchronization 138 139 Galois field 160 General packet...

Ngày tải lên: 09/08/2014, 19:22

... Selection Diversity 5. 5 Rake Receiver 5. 6 Error-Control Codes Diversity and Spread Spectrum 5. 7 Problems 5. 8 References 231 231 233 240 241 243 2 45 247 247 251 253 261 270 2 75 281 289 290 291 Code-Division ... Acquisition Tracking System 4.6 Problems 113 114 117 119 123 1 25 127 129 129 134 134 136 141 142 151 152 154 161 161 166 166 167 170 176 177 181 181 184 1 85 190 191 192 192 193 194 197 197 201 209 ... Pulsed Interference 2.6 Despreading with Matched Filters Noncoherent Systems Multipath-Resistant Coherent System 55 55 58 58 60 65 70 74 77 80 81 83 86 91 100 106 109 viii CONTENTS Rejection of Narrowband...

Ngày tải lên: 20/01/2014, 06:20

Ngày tải lên: 19/02/2014, 14:20

... system of Fig 13, this book Mobk087 August 3, 2007 13: 15 FUNDAMENTALS OF SPREAD SPECTRUM MODULATION p00 z p23 z T2 p12 z T1 p34 z T3 37 p 45 zT4 p10 z T1 p33 z T3 p21 z T2 FIGURE 15: State-transition ...   p 23  p 33 (5. 28) From the Q-matrix, we obtain  [I − Q ]z=1  =  − p 21 − p 12   − p 23  − p 33 (5. 29) book Mobk087 38 August 3, 2007 13: 15 FUNDAMENTALS OF SPREAD SPECTRUM MODULATION ... p 34 = − p 33 ; p 45 = p 10 = − p 12 ; p 21 = − p 23 ; p 34 = − p 33 ; p 45 = 1(primed probabilities are s + n) book Mobk087 40 August 3, 2007 13: 15 FUNDAMENTALS OF SPREAD SPECTRUM MODULATION...

Ngày tải lên: 07/08/2014, 21:20

... với FHSS Ví dụ Direct Sequence Spread Spectrum Transmitter Direct Sequence Spread Spectrum Transmitter Direct Sequence Spread Spectrum Using BPSK Example Approximate Spectrum of DSSS Signal Vấn ... khe thời gian dùng để truyền khung Trải phổ nhảy tần Frequency Hopping Spread Spectrum     Frequency Hopping Spread Spectrum (FHSS) Được phát minh nữ diễn viên Hollywood Hedy Lamarr, Là kĩ ... k chíp mã tương ứng với từ tần số Trải phổ dãy trực tiếp Direct Sequence Spread Spectrum    Direct Sequence Spread Spectrum (DSSS) Sử dụng mã trải phổ băng rộng để điều chế tín hiệu sóng mang...

Ngày tải lên: 13/09/2012, 11:16

... 5. 200 Ghz 44 5. 220 Ghz 48 5. 240 Ghz U-NII Middle Band 52 5. 260 Ghz (5. 250 – 5. 350 Ghz) 56 5. 260 Ghz 60 5. 280 Ghz 64 5. 320 Ghz U-NII Upper Band 149 5. 7 45 Gh (5. 7 25 – 5. 8 25) 153 5. 7 65 Ghz 157 5. 7 85 ... C-Band Radar (weather) 5. 25 - 5. 9 25 Ghz C-Band ISM (802.11a) 5. 7 25 - 5. 8 75 Ghz C-Band satellite uplink 5. 9 25- 6.4 25 Ghz X-Band 8-12 Ghz X-Band Radar (police/weather) 9 .5- 10 .55 Ghz Ku-band 12-18 Ghz ... Ku-band Radar (Police) 13 .5- 15 Ghz 15. 7-17.7 Ghz ISM - Industrial, Scientific and Medical February 20 05 Copyright 20 05 All Rights Reserved 10 FHSS February 20 05 Copyright 20 05 All Rights Reserved...

Ngày tải lên: 13/09/2012, 11:16

Ngày tải lên: 29/09/2013, 20:20

... học 52 ,37 - 8,64 43,73 60 - 12, 45 47 ,55 a) x + 4,32 = 8,67 x = 8,67 – 4,32 x = 4, 35 b) 6, 85 + x = 10,29 x = 10,29 – 6, 85 x = 3,44 c) x - 3,64 = 5, 86 x = 5, 86 + 3,64 x = 9 ,5 d) 7,9 - x = 2 ,5 x ... 37,46 5, 12 - 0,68 4,44 50 ,81 - 19, 256 31 ,55 4 69 - 7, 85 61, 15 -Cả lớp nhận xét sửa Bài : - Yêu cầu Hs đọc đề, phân tích đề làm Số kg đường lấy tất : 10 ,5 + = 18 ,5 (kg) Số kg đường lại : 28, 75 – ... 5, 2 = 5, 7 x = 5, 7 + 5, 2 x = 10,9 b) x + 2,7 = 8,7 + 4,9 x + 2,7 = 13, 6 x = 13, 6 - 2,7 x = 10,9 Bài : - Yêu cầu Hs đọc đề làm - Yêu cầu Cả lớp sửa a)12, 45 + 6,98 + 7 ,55 =(12, 45 + 7 ,55 )+ 6,98 =...

Ngày tải lên: 18/10/2013, 04:11