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中文摘要：
当前，为评价IEEE802．11的DCF非饱和性能，大多采用二维马尔可夫链进行数学建模．根据DCF机制对竞争节点的公半服务特征，推导出节点工作在非饱和态下的传输周期，进而得到吞吐量的数学表达式．与已有模型相比，该模型史为简单，同时能够真实地反映DCF的工作机制．仿真结果与理论结果的吻合证实了模型的有效性．
英文摘要：
Currently, a two dimensional Markov chain is generally used in mathematical modeling to evaluate the performance of IEEE 802.11 DCF under unsaturated conditions. Based on the notion that DCF shows fairness for all contending nodes in the network, this paper derives an average transmission cycle period of a node in unsaturated traffic environments and a mathematical representation of the throughput. Compared with existing works, the proposed approach is simple and can reflect the actual mechanism of DCF. There is a close match between the theoretical derivations and simulation results, indicating effectiveness of the proposed model.
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