Simulation and Modeling of anADSL Modem - Channel Modeland Receiver InitializationMagesh ValliappanEmbedded Signal Processing LaboratoryThe University of Texas at AustinChannel Model✔Model transmission over copper cable– Linear shift invariant (FIR) filter (~100 taps)– Crosstalk - additive colored noise✔Synchronous data flow (SDF)ADSLTransmitterADSLReceiverLinear FilterCrosstalk+ NoiseReceiver Initialization✔Channel and signal to noise ratio estimation✔Initializing channel equalizers– Time domain equalizer (FIR filter)– Frequency domain equalizer– Delay✔SDF blocks driven by finite state machinesTime domainequalizerFFTFrequencydomain equalizerReceiver Initialization✔Synchronization to determine– Sampling instants– Frame boundaries✔Synchronization derived from– Initialization data sequences– Pilot signal– Synchronization frameData CP Data CP Data CPFrame startProposed Work✔Channel model– cable lengths and type, bridge taps, disturbers✔Implement receiver initialization– Capacity maximizing equalizer✔Synchronization– Phase locked loop✔HP EESof design
View Full Document
Unlocking...