Optimization of Wireless Broadband (WiMAX) Systems
AWiMax system integrates a number of new technologies, such as multiantenna technologies and adaptive modulation and coding schemes. Those new technologies potentially deliver high data rates that can satisfy customer requirements. However, proper optimization is necessary for system design to achieve the desired superior performance. This chapter discusses the optimization procedure of a WiMax system from various aspects and particularly the radio resource allocation optimization and scheduling optimization. The radio resource allocation includes the optimization of modulation and coding scheme, MIMO modes, power control and allocation and link adaptation. In scheduling optimization, several service and multi-user scheduler mechanisms used in a WiMax system are discussed. WiMax QoS policy is also presented for the scheduling optimization. Finally, several system-level experiments are presented. The experiment results show that proper optimization can boost the system throughput and satisfy various performance requirements.
KeywordsOrthogonal Frequency Division Multiple Access Best Effort Mobile WiMAX Radio Resource Allocation Proportional Fair Scheduler
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