下行多业务OFDMA系统中基于有效容量的资源分配算法研究

Research on Resource Allocation Algorithm Based on Effective Capacity for Downlink Multi-service OFDMA Systems

该文对多业务OFDMA系统的下行链路资源分配进行了研究,侧重考虑了实时业务用户的QoS要求,建立2维马尔可夫无线信道模型,采用自适应调制技术、有效容量理论以及有效带宽理论,为实时用户分配资源;并实现了非实时业务用户、尽力而为业务用户的资源分配。仿真结果表明,所提算法保证了下行OFDMA系统吞吐量的同时,在实时业务的延时和丢包率等方面都有一定的优越性。

A resource allocation algorithm based on effective capacity theory for downlink multi-service OFDMA systems is proposed, which is focused on the real-time users＇ QoS requirements. A two-dimensional Maxkov wireless channel model is established, and the radio resources are allocated to real-time users by the adaptive modulation technology, the effective capacity theory and the effective bandwidth theory. The downlink radio resources are also simultaneously allocated to non-real-time and best effort users appropriately. Simulation results show that the proposed algorithm ensures the throughputs of the downlink OFDMA systems, meanwhile, it has some advantages on delay and packet dropping rate of real-time users.