Towards Gigabit DSL (GDSL): System Feasibility Study

With the introduction of VDSL2 and the implementation of Fibre-to-the-Curb (FTTC), the theoretical limit of DSL technology is pushed even further than currently known ADSL2+ technology. Current research is investigating the possibility of symmetric DSL at 1 Gbps (GDSL). This paper follows on a SATNAC 2007 paper and addresses a study on the feasibility of a complete complementary multicarrier code-division multiple access (CC/MC-CDMA) transceiver system. This fully functional modem combines the virtues of both orthogonal frequency division multiplexing (OFDM) and conventional code division multiple access (CDMA) to support many users simultaneously with higher spectral efficiencies than conventional CDMA systems and better noise tolerance than existing DSL solutions. We also determine the capacity of the CC-MC-CDMA system.