Design and Analysis of Wireless Systems using CAC and M-QAM Adaptive Modulation for Throughput Improvement

In this paper we introduce an effective bandwidth- based Call Admission Control (CAC) with adaptive modulation technique to manage the traffic in a wireless IP-based network. Since the next generation of communication networks will carry different classes of traffic, e.g., voice, video, fax, data and multimedia, over the same network and these different classes of traffic usually require different quality-of-service (QoS) requirements, the CAC plays an important role in future networks. Furthermore, to enhance the throughput in future wireless communication and efficiently use of the physical resources of the network, we take the advantage of using adaptive modulation M-QAM in order to match transmission rates to time-varying channel conditions. The simulation results show the performance of the proposed architecture.