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Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt

Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt

Theory and applications of ofdm and cdma wideband wireless communications phần 2 ppt

... gain|c(t)| 2 of the channel can be calculated as|c(t)| 2 = a 2 1+ a 2 2+ 2a1a 2 cos( 2 (ν1− ν 2 )t +θ1− θ 2 ).Figure 2. 4 shows|c(t)| 2 for a1= 0.75 and a 2 =√7/4. The ... gain|H(f)| 2 of the channel can becalculated as|H(f)| 2 = a 2 1+ a 2 2+ 2a1a 2 cos( 2 f(τ1− τ 2 )+ θ 2 − θ1).The picture is similar to the one depicted in Figure 2. 4, where ... φ) asQ(x) =π /2 −π /2 ∞x/ cos φr 2 exp−1 2 r 2 drdφ. (1.90)The integral over r can immediately be solved to giveQ(x) =π /2 −π /2 1 2 exp−1 2 x 2 cos 2 φdφ. (1.91)A...
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Theory and applications of ofdm and cdma wideband wireless communications phần 3 ppt

Theory and applications of ofdm and cdma wideband wireless communications phần 3 ppt

... →ˆx) =1 2 σ 2 /d 2 ∞0dt e−d 2 t 22 t0da 2ae−a 2 .The second integral is 1 − e−t 2 so thatP(x →ˆx) =1 2 σ 2 /d 2 ∞0e−d 2 t 22 − e−d 2 +2 22 t 2 dt,which ... 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 ... −ˆs 2 = 4ES/ log 2 (M) = 2Eb,which means that both BPSK (M = 2) and QPSK (M = 4) have the bit error probabilityPb= EC1 2 erfcEb2N0|c1| 2 +|c 2 | 2 as a function of...
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Theory and applications of ofdm and cdma wideband wireless communications phần 4 ppt

Theory and applications of ofdm and cdma wideband wireless communications phần 4 ppt

... theelements 0, 1, 2, 3, 4, 5, 6 is defined by the addition table+ 123 4561 23 4560 2 3456013 4560 12 4 560 123 5 60 123 46 0 123 45 and the multiplication table 123 456 24 61353 625 1441 526 35316 42 654 321 Note ... 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, Ltd 122 CHANNEL ... (i.e. S2t−1= 0, but the syndrome is not equal to zero), then a decoding failure hasoccurred.130 CHANNEL CODING 2 σ 2 yp2 2 σ 2 ys 2 σ 2 yp1SISO1 SISO2Lc1Lc 2 Le1La1Le 2 La 2 L1L 2 DecisionDecisionFigure...
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Theory and applications of ofdm and cdma wideband wireless communications phần 1 ppsx

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. ... is,x 2 =˜x 2 and y 2 =˜y 2 . 2 BASICS OF DIGITAL COMMUNICATIONS and bk=− 2 TT0sin 2 kTtx(t) dt. (1.3)These coefficients are the amplitudes of the cosine and (negative) ... . 22 1.3 TheAWGNChannel 23 1.3.1 MathematicalwidebandAWGN 25 1.3 .2 ComplexbasebandAWGN 25 1.3.3 ThediscreteAWGNchannel 29 1.4 DetectionofSignalsinNoise 301.4.1 Sufficientstatistics 301.4 .2 Maximum...
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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

... 0,f ,2 f , 3f . Here f = 1/T is the OFDM carrier spacing, and 1 72 OFDM –4 2 0 2 4–4 2 0 2 4I(a)(b)–4 2 0 2 4I–4 2 0 2 4I–4 2 0 2 4I–4 2 0 2 4I–4 2 0 2 4IQ–4 2 0 2 4Q–4 2 0 2 4Q–4 2 0 2 4QIBO ... speed and νmax=vcf0 OFDM 1670 0.5 1 1.5 2 2.5 3 3.5 4 2 0(a)(b)(c) 2 t/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) 2 0 2 Q(t)01 2 3AmplitudeFigure 4 .20 ... and in Canada. It uses Band III (174 24 0 MHz) and L-band (14 52 14 92 MHz) frequencies. In many European regions, the TV channel 12 (22 3 23 0 MHz) has been allocated for DAB. For f0= 22 5 MHz and...
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Theory and applications of ofdm and cdma wideband wireless communications phần 6 pot

Theory and applications of ofdm and cdma wideband wireless communications phần 6 pot

... haveEIDRK 2 α 2 =34RKδ 2 α 2 +14RK9δ 2 α 2 (4. 32) for the ID case and EEXRK 2 α 2 =34RKδ 2 α 2 +14RK4δ 2 α 2 (4.33) OFDM 21 30 2 4 6 8 10 12 14 1610−410−310 2 10−1100SNR ... an OFDM system may be called a wideband system relative to the channel parameters only 21 2 OFDM 0 2 4 6 8 10 12 14 1610−410−310 2 10−1100SNR [dB]Union bound for Pb8/ 32 8 /24 8 /20 ... realFigure 4.67 Simulation of a wideband OFDM system with 16-QAM for a moderately fast and frequency nonselective channel. OFDM 24 10 2 4 6 8 10 12 14 16 18 20 10−410−310 2 10−1100Eb/N0...
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Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx

Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx

... pa-rameters for OFDM, modulation and channel coding. The corresponding IEEE 8 02. 11astandard (IEEE 8 02. 11a 1999) and HIPERLAN /2 standard (EN101475 20 01) were releasedin 1999 and 20 00, respectively.The ... alsoL-dimensional complex AWGN with variance σ 2 = N0in each dimension. OFDM 25 9Table 4.9 The OFDM Parametersfor HIPERLAN /2 and IEEE 8 02. 11aKT TS 52 3 .2 µs4µs0.8 µsmultiple access (CSMA). CSMA ... with a delay of N serial bit periods TS, that is, by the duration of one logicalframe of TL= NTS =24 ms. Bit number 2 will be transmitted with a delay of 2TL= 2 · 24 ms, and so on, until...
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Theory and applications of ofdm and cdma wideband wireless communications phần 8 pot

Theory and applications of ofdm and cdma wideband wireless communications phần 8 pot

... ifc∗1c 2 ρ 12 <|c1| 2 (5 .27 )rr100100111Threshold 1c 2 g 2 c1g1Threshold 2 Figure 5 .27 Two-user BPSK SUMF receiver for unequal fading amplitudes and ρ 12 = 0.6. CDMA 29 3Reducing the ... logs∈S0exp1σ 2 s†C†v−1 2 s†Kss∈S1exp1σ 2 s†C†v−1 2 s†Ks. (5.40) 328 CDMA from the union of Regions 2 and 3. For high values of Eb/N0, ... 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...
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Theory and applications of ofdm and cdma wideband wireless communications phần 9 pot

Theory and applications of ofdm and cdma wideband wireless communications phần 9 pot

... ispsc1ssc1,1ssc1 ,2 ssc1,14ssc1,15psc 2 ssc 2, 1ssc 2, 2 ssc 2, 14ssc 2, 15psc8ssc8,1ssc8 ,2 ssc8,14ssc8,15psc5 12 ssc5 12, 1ssc5 12, 2 ssc5 12, 14ssc5 12, 15psc505ssc505,1ssc505 ,2 ssc505,14ssc505,15Scrambling ... expressionsareµl={sl 2 (vl 2 − sl−1ρ 12 [0] − slρ11[1])}for odd values of l and µl={sl 2 (vl 2 − sl−1ρ 12 [1] − slρ 22 [1])}for even values of l.The expressions for ... DL1800 1900 20 00 21 00 22 00Frequency [MHz]Bands forIMT -20 00Figure 5.48 Frequency allocation for IMT -20 00.identified by the ITU for systems of the IMT -20 00 family. The systems of the IMT -20 00family...
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Theory and applications of ofdm and cdma wideband wireless communications phần 10 docx

Theory and applications of ofdm and cdma wideband wireless communications phần 10 docx

... 10pulse, 9 OFDM, 1, 145 OFDM and nonlinearities, 166symbol, 159 OFDM with convolutional coding, 20 8, 21 3 OFDM with QAM, 21 3 OFDM with QPSK, 20 8Omni cell, 27 0Open-loop power control, 28 6, 374, ... 51Doppler spectrum, 57Downlink, 26 9DPCCH, 367DPDCH, 367DPSK, 44DQPSK, 25 0DS -CDMA, 306, 3 62 DTX, 29 3DVB, 20 8, 20 9, 25 1DVB-C, 25 2DVB-S, 25 2DVB-T, 183, 21 3, 25 2Dynamic channel allocation,301Effective ... 199Handover, 27 0, 374, 379, 386Handover gain, 27 2, 27 4, 29 6INDEX 405Handover hysteresis, 29 6, 29 8Hard capacity planning, 29 3Hard handover, 27 0, 374, 379, 386Hierarchical cell structure, 29 4Hierarchical...
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