Simulation and Implementation of a Practical ADSL Environment on DSP Kit

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Executive Summary

In an ongoing effort to study and improve the performance of ADSL modems, the effect of NEXT and FEXT interference is examined. The ultimate purpose is to introduce filters for NEXT and FEXT interference mitigation that would improve the signal to noise ratio at the input of the ADC in the receiver. Towards this end the entire ADSL environment is modeled i.e. transmitter, channel, noise and receiver. The Matlab simulation model was implemented in a TI TMS320VC5416 DSP platform, which was subsequently used to investigate the effects of NEXT and FEXT interference at the receiver. An analysis of SNR profile with interference is presented for various lengths for the three popular twisted pair copper wires 22AWG, 24AWG and 26AWG.

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