Theory and applications of ofdm and cdma wideband wireless communications phần 5 ppsx
Theory and applications of ofdm and cdma wideband wireless communications phần 5 ppsx
... 162 OFDM 0 50 100 150 200 250 300 350 400 450 50 0 50 –40–30–20(a)(b)–10010Normalized frequency fTPower spectrum (linear)0 50 100 150 200 250 300 350 400 450 50 0 50 –40–30–20–10010Normalized ... (b) and theamplitude (c) of an OFDM signal of average power one.–3 –2 .5 –2 –1 .5 –1 –0 .5 0 0 .5 1 1 .5 20.0010.0030.010.020. 05 0.100. 25 0 .50 0. 75 0.900. 95 0.980.990.9970.999Samples of ... where v is the vehicle speed and νmax=vcf0 OFDM 1670 0 .5 1 1 .5 2 2 .5 3 3 .5 4–20(a)(b)(c)2t/TS0 0 .5 1 1 .5 2 2 .5 3 3 .5 4t/TS0 0 .5 1 1 .5 2 2 .5 3 3 .5 4t/TSI(t) –202Q(t)0123AmplitudeFigure...
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Theory and applications of ofdm and cdma wideband wireless communications phần 1 ppsx
... (1.17) Theory and Applications of OFDM and CDMA Wideband Wireless Communications Henrik Schulze and Christian L¨udersBoth of Fachhochschule S¨udwestfalenMeschede, Germanyx PREFACE and modulation. ... examples of CDMA applications we discuss the most important systemsalready mentioned, namely, GPS, cdmaOne (IS- 95) , cdma2 000 and UMTS with its twotransmission modes called Wideband CDMA and Time ... SpectralshapingforOFDMsystems 1604.2.2 Sensitivity of OFDM signals against nonlinearities . . . . . . . . . . 1664.3 Synchronization and Channel Estimation Aspects for OFDM Systems . . . 1 75 4.3.1 Time and...
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Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx
... code signals. We Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L¨uders 20 05 John Wiley & Sons, Ltd266 CDMA tTcTSgk(t)Figure 5. 1 Signature pulse ... highly−40 − 35 −30 − 25 −20 − 15 −10 5 0 5 1010−210−1100X [dBm]p(SIR ≤ X )no PCPCFigure 5. 17 Probability function of the uplink SIR with and without power control.248 OFDM Audioencoder ... definition of wideband is the same as that introduced in Chapter 4 for OFDM. Furthermore,it should not be confused with one transmission mode of UMTS, which is also often called Wideband CDMA. Its...
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Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt
... fluctuations of the received time signal forνmax= 50 Hz, corresponding for example, to a transmit signal at 900 MHz for a vehicle Theory and Applications of OFDM and CDMA Henrik Schulze and Christian ... independent, so that their pdfs can be factorized.MOBILE RADIO CHANNELS 53 –2 .5 –2 –1 .5 –1 –0 .5 0 0 .5 1 1 .5 2 2 .5 –2–1 .5 –1–0 .5 00 .5 11 .5 I-componentQ-componentFigure 2.2 Time variance (selectivity) ... CHANNELS0 0 .5 1 1 .5 2 2 .5 300 .5 11 .5 22 .5 33 .5 Probability densityAmplitudeK = 0K = 32K = 16K = 8K = 4K = 2K = 1Figure 2.8 The Ricean pdf for K = 0 (Rayleigh), and K = 1, 2,...
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Theory and applications of ofdm and cdma wideband wireless communications phần 3 ppt
... is often convenient to work with code words of finite length, but it is not necessary, and the length is not determined by the code. Theory and Applications of OFDM and CDMA Henrik Schulze and ... in the OFDM system DRM (Digital Radio Mondiale). The iterative decoding of a convolutionally codedQAM system with OFDM will be discussed in Subsection 4 .5. 2.3.1 .5 Log-likelihood ratios and the ... L-value of the random bit S. We note thatL(S = s) = sL. (3.10)The L-value of a random bit S (written as a sign) has a very natural interpretation asa soft bit. The sign of L says which of the...
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Theory and applications of ofdm and cdma wideband wireless communications phần 4 ppt
... 0, 1, 2, 3, 4, 5, 6 is defined by the addition table+ 123 456 1 23 456 02 3 456 013 456 0124 56 0123 5 6012346 0123 45 and the multiplication table123 456 2461 35 36 251 44 152 63 53 1642 654 321Note that ... matched to the channel and parallelize the given data streamin an appropriate way. Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L¨uders 20 05 John Wiley & Sons, ... systematic RS code word.Table 3.1 Some RScode parametersRS( 255 , 253 , 3) t = 1RS( 255 , 251 , 5) t = 2RS( 255 , 249, 7) t = 3 RS( 255 , 239, 17) t = 8 16 PC bytes188 data bytes41 zero bytesFigure...
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Theory and applications of ofdm and cdma wideband wireless communications phần 6 pot
... 2K = 153 6, L = 80 OFDM with 16-QAM and Rc= 0 .5 CE idealCE realFigure 4.67 Simulation of a wideband OFDM system with 16-QAM for a moderately fast and frequency nonselective channel. OFDM 2410 ... tm/∆ = 0.0417 B/fcorr= 0 .5 TF/tcorr= 0.8K = 48, L = 80 OFDM with 16- QAM and Rc= 0 .5 Figure 4.74 Simulation of narrowband OFDM for a slow and flat channel.240 OFDM The complex QAM symbols ... 0.0417 B/fcorr= 0 .5 TF/tcorr= 0.8K = 48, L = 80 OFDM with 16- QAM and Rc= 0 .5 CE idealCE realFigure 4.73 Simulation of narrowband OFDM for a slow and flat channel.0 5 10 15 2010−410−310−210−1100SNR...
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Theory and applications of ofdm and cdma wideband wireless communications phần 8 pot
... in Figure 5. 17. CDMA 2992 3 4 5 6 7 8 9 1000 .5 11 .5 22 .5 HSHO [dB]B = 40 dBB = 30 dBFraction of connectionsin SHO mode Mean number of BSsper connectionsFigure 5. 23 Soft handover ... number of base stations involved in a soft handovershould be kept small. To illustrate this soft handover effort, Figure 5. 23 shows the fraction of connections involved in a soft (or softer) handover ... duplexseparation between UL and DL.The method of combining CDMA and TDMA is applied within the TDD transmissionmode of UMTS (see Subsection 5. 5 .5) , where a frequency carrier is divided into 15 timeslots....
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Theory and applications of ofdm and cdma wideband wireless communications phần 9 pot
... ssc1,14ssc1, 15 psc2ssc2,1ssc2,2 ssc2,14ssc2, 15 psc8ssc8,1ssc8,2 ssc8,14ssc8, 15 psc 51 2ssc 51 2,1ssc 51 2,2 ssc 51 2,14ssc 51 2, 15 psc 50 5ssc 50 5,1ssc 50 5,2 ssc 50 5,14ssc 50 5, 15 Scrambling ... While the WCDMA and TD -CDMA- basedmodes use a chip rate of 3.84 Mchip/s and a carrier separation of about 5 MHz, the chiprate for the TD-SCDMA mode is 1.28 Mchip/s at a carrier separation of about ... level of one or more high-powerlevel users. 5. 4 Receiver Structures for MC -CDMA and Asynchronous Wideband CDMA Transmission 5. 4.1 The RAKE receiverAs already pointed out at the beginning of this...
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Theory and applications of ofdm and cdma wideband wireless communications phần 10 docx
... INDEXNyquistbase, 9criterion, 10pulse, 9 OFDM, 1, 1 45 OFDM and nonlinearities, 166symbol, 159 OFDM with convolutional coding, 208,213 OFDM with QAM, 213 OFDM with QPSK, 208Omni cell, 270Open-loop ... 384, 391Channel coding, 93, 2 45 Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L¨uders 20 05 John Wiley & Sons, LtdChannel coding for CDMA, 294Channel diversity, ... 11Gaussian random variable, 25 Generator, 1 15 Generatorpolynomial, 1 15, 280Global Positioning System, 355 Global System for Mobile Communications, 358 Gold codes, 281, 3 65 GPP2, 362GPS, 355 , 381,...
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