Simulation of Third Generation CDMA Systems - Virginia Tech

More documents

Recommendations

Info

psdN 0/2AmplitudeTimeAT c-f s/2f s/2fFigure 3.8a: Chip Figure 3.8b: Noise SpectrumHere,Duration of chip: T cAmplitude of chip: ASampling rate: f sThe energy per chipNoise power spectral density: N 0Ec= A 2 T(3.17)cIf the spreading factor is SF then the energy per bit2E = SF E =( SF)A Tb c c(3.18)The noise variance is given byσ 2 = N f 0 s(3.19)222Eb( SF)A Tc( SF) A ( Tcfs)\ = =22N 2σ/ f 2σ0s(3.20)But T c f s is equal to the number of samples per chip, m.So,ENb02( SF)A m=22σ22 ( SF)A mÃ σ =2( E / N )b0(3.21)38
This expression can be used directly if rectangular pulse shaping is assumed and weintegrate or sum all the samples in a chip to make a decision on the chip at the receiver.However we have to be careful about evaluating noise variance when Raised Cosine pulseshaping is assumed. If at the receiver we sample at the chip rate to reconstruct each chip, wemust use m = 1 in equation (3.7). This is because we are using one sample not m samples formaking a decision on the chip.3.2.5 Pulse ShapingSquare RootRaised CosineFilterChannelSquare RootRaised CosineFilterGaussian NoiseGeneratorSquare RootRaised CosineFilterSquare RootRaised CosineFilterChannelGaussian NoiseGeneratorSquare RootRaised CosineFilterRaised CosineFilterChannelGaussian NoiseGeneratorSquare RootRaised CosineFilter1 Figure 3.9: Implementation of Pulse shaping and Gaussian NoiseData is pulse shaped through a Square Root Raised Cosine (Root RC) filter at thetransmitter. The receiver at the base station has a filter matched to the pulse shaping filter atthe transmitter. Both these filters have a roll-off of 0.22. In the simulator the transmitter and39
Page 1 and 2: Simulation of Third Generation CDMA
Page 3 and 4: AcknowledgmentsI would like to expr
Page 5 and 6: 2.9.2. Transmit Diversity Schemes2.
Page 7 and 8: List of Tables1.1 3G Data Rate Requ
Page 9 and 10: 3.9 Implementation of Pulse shaping
Page 11 and 12: Chapter 1IntroductionThe goal for t
Page 13 and 14: 1.3 Third Generation Cellular Syste
Page 15 and 16: 1.4. WCDMA: Air Interface for 3GOne
Page 17 and 18: 1.4.2 WCDMA Key Technical Character
Page 19 and 20: Chapter 2WCDMA Physical LayerThis c
Page 21 and 22: Channelization Code(C D )cos(ω c t
Page 23 and 24: DataPilotTFCI FBI TPCT slot =2560 c
Page 25 and 26: 2.4 Uplink Spreading CodesThe sprea
Page 27 and 28: Figure 2.6: Auto-correlation for Tw
Page 29 and 30: The following block diagram shows t
Page 31 and 32: 0.180.160.140.12Probabilty Density0
Page 33 and 34: ar( 0) = 2vr( 0) + 1 (2.12)mod 4ar(
Page 35 and 36: 2.8 Channel CodingThe main purpose
Page 37 and 38: 2.9.2 Transmit Diversity SchemesTra
Page 39 and 40: These differences will become evide
Page 41 and 42: Dtoffset = 2 (3.15)cHere c is the v
Page 43 and 44: Each ray is split into two rays, on
Page 45 and 46: The pass-band of the pulse shaping
Page 47: The Rayleigh waveform is generated
Page 51 and 52: e -jϕ1FrameAlignmentResamplingDesc
Page 53 and 54: 3.2.7 BER CounterThe bit error rate
Page 55 and 56: (t)R i ’(t)R i (t)e -jϕ i C SC *
Page 57 and 58: IT+ τT + τi i i I iτ iτ iiiz =
Page 59 and 60: 3.3.2 MAI for DownlinkThe MAI in th
Page 61 and 62: menu is provided which gives the op
Page 63 and 64: up_sim.mpar_up.mat ovsf_gen.m scram
Page 65 and 66: 3.6 Code OptimizationThe simulator
Page 67 and 68: Chapter 4Simulation ResultsThis cha
Page 69 and 70: 10 0 E b/N 010 -1BER10 -210 -30 int
Page 71 and 72: 10 0 Number of Interfererssf=32sf=1
Page 73 and 74: 10 0 E b/N 00 interferer2 interfere
Page 75 and 76: 10 -1 Number of InterferersBER10 -2
Page 77 and 78: constraint length. So for a constra
Page 79 and 80: Table 4.1: Performance Improvement
Page 81 and 82: channel model based on measurement
Page 83 and 84: [7] Kevin Laird, Nick Whinnet, and
Page 85: VitaFakhrul Alam was born in Dhaka,

Simulation of Third Generation CDMA Systems - Virginia Tech

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?