Architecture and performance simulation of single pair HDSL

The possibility, architecture, and performance of a single pair HDSL (SHDSL) are examined in this paper. Two architectural alternatives, echo canceller (EC) based and frequency division multiplexed (FDM), are studied. The channel capacity and decision feedback equalizer (DFE) based transceiver performance are examined for different self and foreign near end crosstalk (NEXT) and far end crosstalk (FEXT) noise environments. Simulation results show that only a FDM SHDSL is possible for the carrier serving area (CSA) loop with 6 dB of performance margin. This FDM SHDSL can also be deployed in the same loop plant with basic rate ISDN access channel, dual duplex HDSL, or a limited number of FDM asymmetrical digital subscriber line (ADSL) systems. A coding gain of about 4 dB is necessary if ADSL NEXT is to be considered. Otherwise, a simpler FDM SHDSL can also be realized with a wider spectrum bandwidth on a traditional DFE transceiver. Results here can be used as references for the development of a SHDSL system