Implementation of OFDM Transmitter based on the IEEE 802.16d StandardWhy is it Important to You?Presentation OrganizationSignals and ModulationWhat Is Orthogonal Frequency Division Multiplexing (OFDM)?How OFDM works?Our Simple Transmitter Block DiagramTransmitter based on the IEEE 802.16d StandardTransmitter ImplementationTesting and ValidationSafety PrecautionsBudget ConstraintsFuture Transmitter ImplementationsAcknowledgementsConclusionImplementation of OFDM Transmitter based on the IEEE 802.16d StandardPresented by: Altamash Janjua, Umar ChohanSupervisors: Dr. Brian L. Evans and Mr. Ian Wong Technical TA:Mr. Youngok KimDate: 2nd December, 2004Why is it Important to You?Tremendous Growth of Wireless CommunicationsWireless Metropolitan Area Networks (WMANs)Future Projects in the Industrywww.gettyimages.comPresentation OrganizationIntroduction Transmitter Block DiagramIEEE 802.16d StandardsTransmitter ImplementationDesign Testing and ValidationBudget Constraints and Safety FeaturesFuture RecommendationsConclusionSignals and ModulationContinuous-time and Discrete-time signalsModulation : Carrier Amplitude and/or Frequencytx(t)http://www.ece.utexas.edu/~bevansWhat Is Orthogonal Frequency Division Multiplexing (OFDM)?Multi-carrier Amplitude modulationscheme–Each Carrier’s amplitude is modulatedWell-suited for Wireless Communicationwww.iec.org/online/ tutorials/ofdm/topic04.html AmplitudeFrequencyHow OFDM works?Parallel Data StreamsData Encoding is based on Amplitude ModulationMultiple Carriers are combined through the Fourier Series–Computed by Inverse Fast Fourier transform4-QAM modulationOur Simple Transmitter Block DiagramChannelSerialTo ParallelEncoding BankIFFT Parallel To SerialCyclicPrefixSerial Data SourceTransmitter based on the IEEE 802.16d StandardUpcoming Standard for Wireless Metropolitan Area Networks (WMANs)Specifications Used–256 FFT–56 guard carriers–16- QAM–Pilots and GuardsTransmitter ImplementationNational Instruments Lab VIEW FPGAVHDL and Lab VIEW programmingOne Main Virtual Instrument (VI)–16-QAM Encoding Bank –256 point Complex IFFT core developed by Xilinx Inc.–Cyclic Prefix ModuleTesting and ValidationIndividual Modules Tested through Software SimulationsDeveloping a Host PC VI for the Testing of final HardwareSample test results provided in the IEEE 802.16d StandardSafety PrecautionsFundamental Canon of Engineering: “Hold Paramount Public Health and Safety”Repeated Design Testing for Functional Verification and RobustnessAdditional Indicators for Warningswww.gettyimages.comBudget ConstraintsNo Purchases InvolvedHardware and Software Provided by SupervisorsTime-ConsumingCurrently testing the designwww.gettyimages.comFuture Transmitter ImplementationsConventional Field Programmable Gate Arrays Digital Signal ProcessorsApplication Specific Integrated Circuitswww.gettyimages.comAcknowledgementsSupervisors:–Dr. Brian L. Evans –Mr. Ian WongTechnical Teacher Assistant:–Mr. Youngok KimConclusionThank