Modeling and Simulation of an ADSLTransmitter Qiu WuKripa VenkatachalamModeling and Simulation of an ADSL Transmitter 2ADSL Overview• High-bitrate Digital Subscriber Line– Asymmetric data throughput• Upto 6Mbps upstream and 640Kbps downstream– Advantages and Application• Simultaneous high-speed data transmission and normal telephoneservices• Optimal channel usage based on channel noise conditions• Easy deployment• Internet Access– Discrete Multitone Modulation• Very powerful DSPsModeling and Simulation of an ADSL Transmitter 3Project Objectives• Simulation in Ptolemy– SDF actors– Configurable Environment– Extensible– Performance Analysis• Contributions to Ptolemy– SDF stars with generic functionality– Useful in communication applicationsModeling and Simulation of an ADSL Transmitter 4Implementation Specifics• Subset of ADSL G.Lite– Splitterless– 128 Channels• Transmitter Components– Error Protection Blocks: CRC, Scrambler, Reed Solomon Encoder, Interleaver– Function Blocks: Constellation encoder, 256-point IFFT, Cyclic prefix• SDF Actors• Receives parameters determined through initialisationthrough filesModeling and Simulation of an ADSL Transmitter 5Implementation Specifics (2)• Features– Configurable CRC, Scrambler, Reed Solomon Coderand Interleaver blocks– Supports the optional modes of RS code and Interleaver– Parameter compatability check– Performance Evaluation Environment• Error rate evaluation• Effect of channel noise on the data rateModeling and Simulation of an ADSL Transmitter 6Conclusions• Contributions– Configurable and Extensible simulation environment for ADSLtransmitter– Reference Design– Ptolemy• Programmable Reed Solomon Coder• Programmable CRC• Programmable Interleaver• Limitations– Different Initialisation and Data transfer models– Handshake with
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