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电子学报  2012 

一种关联SNR的停等DCF优化方案

DOI: 10.3969/j.issn.0372-2112.2012.07.008, PP. 1333-1338

Keywords: IEEE802.11,DCF,速率控制,自适应调制编码,优化

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Abstract:

针对IEEE802.11的DCF(DistributedCoordinationFunction)效率较低的问题,提出了一种结合速率控制的改进方案——停等DCF及其性能分析模型.速率控制使用自适应调制编码技术给出了可调节业务BER(BitErrorRate)的SNR(SignaltoNoiseRatio)门限确定算法;设置暂停信道接入的最低SNR门限,可减少传输错误,并降低接入冲突;调节BER,可在信道时间、冲突概率和误帧率间达到优化折中,使系统吞吐率最大.分析和仿真说明了模式是准确的,停等DCF有效地克服了DCF缺乏丢包区分机制的问题,实现了跨层的性能优化.

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