Towards Gigabit DSL (GDSL): Design of a CC/MC-CDMA Modem

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 ADSL technology. Current research is investigating the possibility of symmetric DSL at 1 Gbps (GDSL). This paper addresses the design and implementation of a Complete Complementary Multi-Carrier Code-Division Multiple Access (CC/MC-CDMA) transmitter/receiver pair. 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.