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Transmission Channel of Pre-compensation Response in the ADSL 1.6M bps Multimedia Access Network

Suhono H. Supangkat & Eru P

 


Abstract. The development of the living pattern of society has increased the needs of faster and easier services, such as multimedia access network. One of the xDSL family, as an alternative to the network access technology, is the 16-QAM ADSL. The main problem in xDSL is reducing the transmission channel response which usually can be accomplished by using an equalizer. Transmission channel of pre-compensation response can be added to assist the work of the equalizer. A pre-compensation is a filter which has been added before ADC to compensate the earlier response of the transmission channel. The utilization of the pre-compensation can reduce the length of the equalizer coefficients from 100 tap to 20 tap. The 16-QAM ADSL can reach the capacity of 1.6M bps (TI/DSI 1.544Mbps) in a 18 kft channel 26 AWG. The 16-QAM ADSL transceiver system which is explored in this study has worked well after 0.25 second training period. The sampling phase error is about 7.2 and the sampling frequency error is about 10 Khz.

Keywords: access network; ADSL; compensation; equalization; multimedia

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