“…Adaptive modulation increases data transmission throughput and the system reliability by using different constellation sizes on different sub-carriers. The authors in (Peyre et al, 2008) introduce a new Quality of Service (QoS) for real-time calls in IEEE802.16e Multi-class Capacity including AMC scheme and QoS Differentiation for Initial and Bandwidth Request Ranging (Seo et al, 2004). The QoS defined in this work is to maintain a same bit rate for RT calls independently of user position in the cell.…”