Cross-layer design of packet scheduling and adaptive resource allocation in multiuser MIMO-OFDM systems are investigated based on space-time block coding (STBC). Different types of service are grouped into four types according to the 802.16 protocol. A two-layer scheduling architecture is then used to shape traffic at medium access (MAC) layer: the first layer schedule packets for different users of the same service type,and the second for different service types. A resource allocation algorithm is proposed to efficiently allocate wireless resource at physical layer according to the scheduling result8 of the MAC layer and the channel state information. Simulation results show that the proposed algorithm can achieve significant improvement in packet drop rate, packet delay, and system throughput as compared to an existing method.%研究了多用户MIMO-OFDM系统中基于空时编码的联合数据包调度和动态资源分配的跨层设计.根据IEEE 802.16协议将所有业务类型分为4类,在媒体接入层利用一种分层的调度架构进行各用户各业务间的数据包调度:第1层调度器负责同类业务中不同用户的调度,第2层负责不同业务之间的调度.最后在物理层根据媒体接入层调度结果和信道状态信息联合考虑进行无线资源的自适应分配.仿真结果表明,所提出的方法在丢包率、包时延和系统吞吐量等方面的性能都有明显提高.
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