An adaptive multi-carrier modulation scheme for wireless ATM networks

Broadband wireless ATM networks are subject to selective fading effects resulting in severe intersymbol interference (ISI) and, consequently, high bit error rate (BER). multi-carrier modulation (MCM) is an effective technique to mitigate the undesirable influence of frequency selective fading. We compute the performance of a wireless ATM network that uses MCM and we propose and analyse an adaptive MCM scheme in which the poorest sub-carriers are suppressed. We also present a modified system, in which the ATM cells are interleaved before transmission, in such a way that each cell is fully transmitted by a particular sub-carrier.