Multi-Carrier and Spread Spectrum Systems: From OFDM and MC ...

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226 Applicationsdata symbolPilot grid with 1 antenna:pilot symbolno symbolPilot grid with 2 antennas:Pilot grid with 4 antennas:Antenna 1 Antenna 2 Antenna 3 Antenna 4Figure 5-9Pilot grid within one resource block for one, two, and four transmit antennas5.2.5.4 Multi-Antenna TransmissionMulti-antenna transmission (antenna mapping) with up to four transmit antennas is specifiedin LTE. A maximum of two code words, i.e. transport blocks, can be transmitted inparallel by applying spatial multiplexing. The multi-antenna transmission is defined in atwo-stage process indicated in Figure 5-10 [6].LayersCode wordsLayermappingPrecodingAntennasFigure 5-10Antenna mapping in the downlink
3GPP Long Term Evolution (LTE) 227The first stage is the layer mapping, where the transport blocks are mapped on to one orseveral layers. In the second stage, the layers are pre-coded according to the selected multiantennatransmission scheme. This can be spatial multiplexing, beamforming, or transmitdiversity. The specified multi-antenna transmission schemes are detailed in the following.Spatial MultiplexingSpatial multiplexing is used to transmit in parallel two transmission blocks using thesame time–frequency resource. If the two transmission blocks belong to one user, thescheme is referred to as a single-user MIMO (SU-MIMO). Alternatively, the two transportblocks can belong to different users. This scheme is referred to as multi-user MIMO (MU-MIMO). The spatial multiplexing is based on a so-called codebook-based pre-coding. Thecodebook specifies a set of spatial pre-coding matrices that can be used at the transmitter.The actual pre-coding matrix is chosen based on channel quality information obtained bychannel measurements per antenna in the downlink.Spatial Multiplexing with Cyclic Delay Diversity (CDD)To improve the performance of spatial multiplexing further, the combination of codebookpre-coding with CDD (see Section 6.3.1.3) is specified. Two types of CDD are distinguished.The first type is CDD with large cyclic shifts in order to achieve frequencydiversity within one sub-band. The second type is CDD with small cyclic shifts wherethe channel remains flat within one sub-band but a frequency scheduling gain can beobtained by increased frequency selective fading over the total bandwidth.BeamformingCodebook pre-coding with only one layer, i.e. one transport block per time–frequencyresource, results in beamforming.Beamforming with Cyclic Delay Diversity (CDD)CDD can be combined with beamforming in the same way as already described for spatialmultiplexing.Transmit DiversitySpace frequency block codes (SFBCs, see Section 6.3.4) are applied as transmit diversityscheme. Mapping schemes are defined for two and four transmit antennas. A singlecodeword is mapped to the layers, which are SFBC pre-coded before transmission via theantennas.5.2.6 Uplink Transmission SchemeThe transmission scheme of the LTE uplink is localized DFT-spread OFDM(see Section 3.2.4). The block diagram for DFT-spread OFDM is shown in Figure 5-11.DFT-spread OFDM is a single-carrier FDMA scheme that guarantees a low PAPR. Thisis essential for the power efficiency of the mobile terminal transmitter. A certain amountof flexibility in resource allocation and scheduling is achieved with DFT-spread OFDMin the uplink. The block diagram of the LTE uplink is shown in Figure 5-12.
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Multi-Carrier andSpread SpectrumSys
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This edition first published 2008©
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Contentsix4.3.2 One-Dimensional Cha
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ForewordThis book discusses multi-c
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Preface (First Edition)Nowadays, mu
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AcknowledgementsThe authors would l
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2 Introductionambitious technologic
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4 IntroductionTables 1 and 2 summar
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6 IntroductionPower densityTimeFreq
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8 Introductiona high immunity again
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10 Introductionprocessing gain P G
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12 Introductionand interactive mult
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14 Introduction[43] Saltzberg, B. R
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16 FundamentalsBSTSFigure 1-1Time-v
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18 Fundamentalswhere p =|a p | 2 (1
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20 Fundamentalssuch that the effect
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22 FundamentalsTable 1-2 Delay powe
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24 Fundamentals(i) Fixed Positioned
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26 Fundamentalson sub-channel n of
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28 Fundamentals10 010 −1OFDM (OFD
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30 Fundamentalsin order to achieve
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32 FundamentalsThe discrete length
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34 FundamentalsThe following matrix
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36 FundamentalsTable 1-11Wireless l
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38 FundamentalsFrequency hopping (F
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40 FundamentalsFinally, a threshold
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42 Fundamentals1.3.3 Applications o
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44 FundamentalsTable 1-12Radio link
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46 FundamentalsOrthogonalV-SF codeF
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{{48 Fundamentalsdata symbolsspread
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50 FundamentalsCellular Mobile Radi
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52 Fundamentals[27] Haindl B., “M
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2MC-CDMA and MC-DS-CDMAIn this chap
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MC-CDMA 57whered = (d (0) ,d (1) ,.
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MC-CDMA 59i.e. the spreading is per
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MC-CDMA 61Table 2-1 PAPR bounds of
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MC-CDMA 632.1.4.4 Rotated Constella
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MC-CDMA 65After inverse OFDM the re
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MC-CDMA 67and requires only informa
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MC-CDMA 69hard interference evaluat
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MC-CDMA 71Thedataofthedesireduserk
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MC-CDMA 73L corresponds to the spre
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MC-CDMA 752.1.7 Combined Equalizati
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MC-CDMA 77broadcasting, WLAN, and W
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MC-CDMA 792.1.8.1 Log-Likelihood Ra
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MC-CDMA 81For coded MC-CDMA systems
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MC-CDMA 83where Q different user gr
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MC-CDMA 85Table 2-2MC-CDMA system p
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MC-CDMA 87first iteration. The opti
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MC-CDMA 8910 010 −110 −2BER10
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MC-CDMA 9110 010 −1BER10 −210
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MC-CDMA 9310 010 −110 −2BER10
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MC-DS-CDMA 95c (k) (t)f 00d (k)S/P+
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MC-DS-CDMA 97The user-specific dela
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MC-DS-CDMA 9910 010 −1BER10 −21
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References 101[7] Brüninghaus K. a
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References 103[49] Steiner B., “U
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106 Hybrid Multiple Access SchemesI
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108 Hybrid Multiple Access Schemesw
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110 Hybrid Multiple Access Schemest
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112 Hybrid Multiple Access SchemesO
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114 Hybrid Multiple Access SchemesT
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116 Hybrid Multiple Access SchemesA
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120 Hybrid Multiple Access Schemest
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122 Hybrid Multiple Access SchemesA
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126 Hybrid Multiple Access Schemes[
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4Implementation IssuesA general PHY
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Multi-Carrier Modulation and Demodu
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Synchronization 139The performance
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Synchronization 141null symbol as a
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Synchronization 143resulting SNR ca
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Synchronization 145SNR Degradation
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Synchronization 147FFTr(k)estimated
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Synchronization 149the timing error
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Synchronization 151A first simple s
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Synchronization 153Transmitted 2 re
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Channel Estimation 155Special cases
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Channel Estimation 157The mean squa
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Channel Estimation 159by the second
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Channel Estimation 161Given the nor
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Channel Estimation 163and f D, filt
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Channel Estimation 16510 010 −110
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Channel Estimation 16710 010 −13
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Channel Estimation 169in order to r
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Channel Estimation 17110 010 −1BU
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Channel Estimation 173timefreq. 00
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Page 197 and 198: Channel Coding and Decoding 177Tabl
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Page 201 and 202: Channel Coding and Decoding 181n rk
Page 203 and 204: Channel Coding and Decoding 183Bit
Page 205 and 206: Channel Coding and Decoding 185Bit
Page 207 and 208: Signal Constellation, Mapping, De-M
Page 209 and 210: Signal Constellation, Mapping, De-M
Page 211 and 212: Adaptive Techniques in Multi-Carrie
Page 213 and 214: RF Issues 193hence reduce, for inst
Page 215 and 216: RF Issues 195s(t)r(t)e jf(t)White n
Page 217 and 218: RF Issues 197receivedsignalto detec
Page 219 and 220: RF Issues 1994.7.2.1 Effects of Non
Page 221 and 222: RF Issues 2011e−011e−02UplinkDo
Page 223 and 224: RF Issues 203of data pre-distortion
Page 225 and 226: RF Issues 205Table 4-8Minimum total
Page 227 and 228: RF Issues 207Detection strategyIn t
Page 229 and 230: RF Issues 209above formula becomes(
Page 231 and 232: References 211[21] Fazel K., “Nar
Page 233 and 234: References 213[66] Nobilet S., Hela
Page 235 and 236: 5Applications5.1 IntroductionThe de
Page 237 and 238: Introduction 217high speed as well
Page 239 and 240: 3GPP Long Term Evolution (LTE) 219H
Page 241 and 242: 3GPP Long Term Evolution (LTE) 221U
Page 243 and 244: 3GPP Long Term Evolution (LTE) 2231
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Page 257 and 258: WiMAX 237Table 5-12 Downlink LTE sp
Page 259 and 260: WiMAX 239Wi-FiBusinessTSWiMAX BSTSM
Page 261 and 262: WiMAX 241Table 5-16Summary of the I
Page 263 and 264: WiMAX 243WiMAXInteroperabilityInter
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Page 267 and 268: WiMAX 247Radio ResourceControlIniti
Page 269 and 270: WiMAX 249Frame n−1 Frame n Frame
Page 271 and 272: WiMAX 251Read RF-Channel ListScan F
Page 273 and 274: WiMAX 253NormaloperationTS measures
Page 275 and 276: WiMAX 255Table 5-18Example of some
Page 277 and 278: WiMAX 257Total bandwidth (between 1
Page 279 and 280: WiMAX 259Sub-carriers (frequency)n0
Page 281 and 282: ApplicationsWiMAX 261Table 5-23 Gen
Page 283 and 284: WiMAX 263Table 5-27(OFDMA)FEC codin
Page 285 and 286: WiMAX 265M-QAMMappingSTC withSpatia
Page 287 and 288: WiMAX 267Frame n−1 Frame n Frame
Page 289 and 290: WiMAX 269Table 5-29WirelessMAN-OFDM
Page 291 and 292: WiMAX 2710Power density in dB−25
Page 293 and 294: WiMAX 273Table 5-37diversityPeak da
Page 295 and 296: WiMAX 275Table 5-41DL link budget e
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Future Mobile Communications Concep
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Wireless Local Area Networks 283MTB
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Wireless Local Area Networks 285fre
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Interaction Channel for DVB-T: DVB-
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References 297Table 5-58Parameters
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References 299[32] Taoka H., Higuch
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302 Additional Techniques for Capac
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340 Definitions, Abbreviations, and
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350 SymbolsG l,lGG [j]h(t)h(τ,t)H(
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Index3GPP 218Adaptive techniques 19
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Index 355Forward error correction (
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Index 357Multi-carrier modulation a
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Index 359Maximum likelihood paramet
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