中文摘要：

在分析IEEE 802.11n中A-MSDU和A-MPDU两种MAC层帧聚合机制的基础上,针对MAC层帧聚合中子帧必须使用相同调制编码方式以及具有最大帧长限制的问题,引入物理层超帧,并采用自适应帧聚合机制来改善系统的吞吐量性能.推导了有扰信道下采用DCF接入机制时各类帧聚合以及帧分段方式在饱和状态的吞吐量,讨论了网络站点数、帧长度、接入模式对吞吐量的影响,分析了DCF接入机制下成功接收的帧延时和延时要求对最大聚合帧数的限制.仿真结果表明,在特定误比特率和延时要求下,所提出的自适应帧聚合机制可以通过选择合适的帧聚合或帧分段方式使吞吐量最大化.

英文摘要：

Based on the analysis of two kinds of medium access control（MAC） layer frame aggregation,A-MSDU and A-MPDU,in IEEE 802.11n,physical layer super-frame is introduced against the problems of same modulation/coding format for all sub-frames and frame length limitation arising from MAC layer frame aggregation.Adaptive frame aggregation mechanism is adopted to improve the system throughput performance.The saturation throughputs of various frame aggregation methods and the frame fragmentation using distributed coordination function（DCF） access mechanism under noisy channels are derived.The effects of number of stations,frame lengths and access modes on saturation throughput are discussed.The frame delay of successfully receipt under DCF access mechanism and the restrictions on maximum frame aggregation length are analyzed.The simulation results show that the system throughput can be maximized by adaptive frame aggregation mechanism through choosing the right method of frame aggregation or frame fragmentation under specific bit rate error and delay requirement.