CDMA: Access and Switching P1 potx
CDMA: Access and Switching P1 potx
... Division Multiple Access (G-TDMA).2 CDMA: ACCESS AND SWITCHING cancellation techniques known as multiuser detectors (see Chapter 10). Such techniquesare implemented at the receiver and they attempt ... factor.In order to enhance capacity, PO-CDMA sytems utilize multiple access interference CDMA: Access and Switching: For Terrestrial and Satellite NetworksDiakoumis Gerakoulis, Evaggelos GeraniotisCopyright ... composite access methods for wireless two-step access networks, and for multiplexing multiple symbolrates in orthogonal CDMA channels.22 CDMA: ACCESS AND SWITCHING ai1ai2ai3ai4ai1ai2ai3ai4TdTadi=1di=...
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cdma access and switching for terrestrial and satellite networks
... 25710.4Conclusions 266References 267Index 26940 CDMA: ACCESS AND SWITCHING Figure 2.4 Fourier, Hadamard and Karhunen–Loeve orthogonal codes of size-16.22 CDMA: ACCESS AND SWITCHING ai1ai2ai3ai4ai1ai2ai3ai4TdTadi=1di= ... 1.3 The Spreading Process in Orthogonal CDMA.28 CDMA: ACCESS AND SWITCHING References[1] D. Gerakoulis ‘G -CDMA: a Unifying Approach to Multiple Access Com-munications’ AT&T Labs-Research ... hn=−1=−N/2x(−−1)nwn,−−1e−j(2π/N−φ−−1)+N/2−1=0x()nwn,ej(2π/N−φ)36 CDMA: ACCESS AND SWITCHING w = + 1, by cyclic shifting the sequence ai and placing a leading row and column ofx =1,or−1, so that the number of...
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CDMA: Access and Switching P3 doc
... Control Unit (CCU). The72 CDMA: ACCESS AND SWITCHING To RF~π/2cos(2πf0t)sin(2πf0t)ΣD/A and FilteringFIRFIRD/A and FilteringFigure 3.11 The baseband quadradure modulator.by ... Rs.62 CDMA: ACCESS AND SWITCHING # 1 # 2 # 3 # 43 # 44# 4210 MHz bandFor Traffic Channels only Access ChannelonlyEach Uplink Beam - ii = 1, , 32# 1 # 2 # 3 # 43 # 44# 4210 MHz band Pilot,SYNC and PagingChannelsonlyFor ... The Access channel receiver unit.80 CDMA: ACCESS AND SWITCHING initial registration automatically after its initialization. This is done with an initialtransmission over an Access channel and...
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CDMA: Access and Switching P4 ppsx
... (Electronic)90 CDMA: ACCESS AND SWITCHING RF/BB: RF to Baseband converterBR&OS: Beam Recovery and OverspreadingCDB: Code Division BusTCR&RS: Traffic Channel Recovery and RespreadingUP ... frequency bands. Thesatellite system operates over S uplink and S downlink frequency bands of bandwidthW ≈ 10 MHz each (S=40 at Ka band). Hence, there are S switching modules, eachCODE DIVISION SWITCHING ... switch design in this case will be as in102 CDMA: ACCESS AND SWITCHING is the BS/CDMA for wireless terrestrial networks. On the other hand,SS/CDMA and CS/CDMA applications do not require demodulation/re-modulation...
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CDMA: Access and Switching P5 pot
... Lc= 32, L =32 and Bp= 10. We observe that packet traffic can be routed through the switch even128 CDMA: ACCESS AND SWITCHING [4] C. Rose and M.G. Hluchyj ‘The performance of random and optimalscheduling ... module (and thus onepair of frequency bands) of size N × N for switching traffic between N uplink and N downlink beams. Each beam has a capacity of L traffic channels in each frequencyband. Lc and ... results, we observe that when116 CDMA: ACCESS AND SWITCHING Step 0:m =0. Set matrices Tma and Tmsuch thattij(Tma)=tij(Ta(k − 1)),ifri(Tr(k − 1)) <Lc and cj(Tr(k − 1)) <Lc....
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CDMA: Access and Switching P6 ppt
... signal phases Φiare then mapped into the inphase and quadraturecomponents (a, b), Φi→ (a, b). CDMA: Access and Switching: For Terrestrial and Satellite NetworksDiakoumis Gerakoulis, Evaggelos ... f1.138 CDMA: ACCESS AND SWITCHING for SO/SE-CDMA and Ck,i=1LuLbLu−1l=0w(k)[l]w(i)[l]c(bk)[l]c(bi)[l](l+1)Lb−1m=lLbw(bk)[m]w(bi)[m]for FO/SE-CDMA and MO/SE-CDMA.Code ... any), and AWGN. E{II} =E{IQ} =0.Thus,ZI and ZQare jointly Gaussian uncorrelated and thus independentrandom variables. Their normalized mean is 1 (signal) and their variance is (forbaseband...
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CDMA: Access and Switching P7 pps
... acknowledged. The Access Channel Receiver Unit (ACRU), shown in Figure 7.2-A, consists of a non-170 CDMA: ACCESS AND SWITCHING ACTU: Access Channel Transmitter UnitS&PRU: SYNC and Paging Receiver ... J. D. Powell and M. L. Workman Digital Control of DynamicSystems, 2nd Ed. Addison-Wesley, Massachusetts, 1990.164 CDMA: ACCESS AND SWITCHING channels are, the Pilot, the Sync and the Paging ... system information supplied by the Sync channel, the SU168 CDMA: ACCESS AND SWITCHING DESPREADING AND TESTING(EARLY)DESPREADING AND TESTING(LATE)DEMODWkiE giE WiE WkiL...
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CDMA: Access and Switching P8 pot
... (B) Rayleigh fading and for one and six users.J =7,Jmax= 50, P =1,N = 31, L = 1. Filter length = 31 for both schemes.202 CDMA: ACCESS AND SWITCHING of users Ku=1, 6, and the processing gain ... DPSK.Figures 8.4-A and -B show that oversampling is very important for the SAD scheme.The optimum J was obtained previously, and it should be followed. It also shows that208 CDMA: ACCESS AND SWITCHING the ... Section 8.4 we present the system model, the design and the BER analysis CDMA: Access and Switching: For Terrestrial and Satellite NetworksDiakoumis Gerakoulis, Evaggelos GeraniotisCopyright...
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CDMA: Access and Switching P9 pot
... 0-470-84169-9 (Electronic)212 CDMA: ACCESS AND SWITCHING lose their compactness in spectrum which leads to out-band spectral regrowth (seereferences [1] and [2]). A band-pass filter then has to ... θ(k3)=Kk=212C(I1,Qk)2d2Ib(k)Q[0]2+12C(I1,Qk)2d2Qb(k)Q[0]2+232 CDMA: ACCESS AND SWITCHING Following the same method, all the α23terms and cross-corrleation terms can becomputed similarly.9A.3 General ResultsBy computing the first and second ... NIis 0 and the variance of NIis σ2N=N0Ts.N02is the two-sided powerspectral density.216 CDMA: ACCESS AND SWITCHING more vulnerable the system is to nonlinear distortion and the...
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CDMA: Access and Switching P10 pps
... to that proposed240 CDMA: ACCESS AND SWITCHING include centralized [2] and distributed [3], [4], power control methods. The distributedalgorithms are simpler to implement and will be the focus ... a single user detection case.268 CDMA: ACCESS AND SWITCHING [18] M. K. Varanasi and B. Aazhang ‘Multistage detection in asynchronouscode-division multiple -access communications’ IEEE Trans. ... log-normally distributed, and the MAI can be approximated as log-258 CDMA: ACCESS AND SWITCHING a lower-complexity approximation of the first. The multi-user detection and channelestimation schemes...
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