Cross-Layer Optimization in OFDM Wireless Communication Networkud

摘要

The wide use of OFDM systems in multiuser environments to overcome problem of communicationudover the wireless channel has gained prominence in recent years. Cross-layer Optimization techniqueudis aimed to further improve the efficiency of this network. This chapter demonstrates that significantudimprovements in data traffic parameters can be achieved by applying cross-layer optimization tech-udniques to packet switched wireless networks. This work compares the system capacity, delay time anduddata throughput of QoS traffic in a multiuser OFDM system using two algorithms. The first algorithm,udMaximum Weighted Capacity, uses a cross-layer design to share resources and schedule traffic to usersudon the network, while the other algorithm (Maximum Capacity) simply allocates resources based onlyudon the users channel quality. The results of the research shows that the delay time and data throughputudof the Maximum Weighted Capacity algorithm in cross layer OFDM system is much better than that ofudthe Maximum Capacity in simply based users channel quality system. The cost incurred for this gain isudthe increased complexity of the Maximum Weighted Capacity scheme.ud