MC-TDMA scheme for downlink broadband wireless communications

In this paper, a multicarrier time division multiple access (MC-TDMA) technique is presented for downlink broadband wireless communications. It combats multipath interferences by OFDM modulations and distinguishes multiple users through different chip-level time slots. In order to gain insights on its performance and complexity, the relationship between this MC-TDMA scheme and a special MC-CDMA technique with maximum multipath diversity gain is emphatically investigated, which reveals that the former can be viewed as an equivalent but simplified implementation approach of the latter and furthermore, the former offers more flexibility in the system design and reconfiguration than the latter.