Simulation of Third Generation CDMA Systems - Virginia Tech

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down_sim.mpar_down.mat ovsf_gen.m scram_code_down.mat over_channel.m mai_down.m pulse_shaping.m mpath_down.mrayleigh.mdown_finalmenu.mFigure 3.22c: Simulator Code Structure Continued (Downlink Simulator)54
3.6 Code OptimizationThe simulator was implemented in MATLAB to take advantage of the built-infunctions that perform various signal processing application like filtering and Fast FourierTransformation (FFT) and the superior array handling capability. To make the simulator runwithin a reasonable simulation time, we had to optimize the MATLAB code. We generatedthe complex scrambling codes separately and stored them in binary data files. During thesimulation run, the simulator reads the desired scrambling codes form these data files. Thiswas necessary since the generation of long scrambling code takes long time and it would notbe practical to generate the scrambling codes during running the simulator.Figure 3.23 shows the MATLAB profile of the uplink simulator. The simulator is runfor Vehicular A Outdoor Channel with one interfering user. The Rayleigh waveform isgenerated at the chip rate. As we notice the simulator spends significant amount of time inlines 184 and 173. They correspond to the functions implementing MAI and time varyingchannel respectively. The generation of Rayleigh waveform takes up most of the simulationtime in both the functions. However generating Rayleigh waveform at symbol rate ratherthan at chip rate can significantly reduce the simulation time. Another way to reduce thesimulation time is to demodulate the signals from the all the interfering users and count theirerrors towards the BER calculation. However this will increase the complexity of the receiverimplementation and we will not have the option of assigning different spreading factors fordifferent users.55
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Simulation of Third Generation CDMA
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AcknowledgmentsI would like to expr
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2.9.2. Transmit Diversity Schemes2.
Page 7 and 8:
List of Tables1.1 3G Data Rate Requ
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3.9 Implementation of Pulse shaping
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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 and 48: The Rayleigh waveform is generated
Page 49 and 50: This expression can be used directl
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: up_sim.mpar_up.mat ovsf_gen.m scram
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,
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Simulation of Third Generation CDMA Systems - Virginia Tech

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