为提高IEEE802.11 DCF在差错信道中的性能，本文在现有协议DCFf(DCF in fading channel)的基础上，通过改进网络规模调整参数q的算法，提出了一种新的基于网络规模的信道接入机制SDCFf(Scale-based DCF in fading channel)。该机制适用于带有噪音的无线衰落环境。本文通过数据成功发送概率和饱和吞吐量等度量来衡量SDCFf的性能，根据网络规模和信道状态，通过q值动态调整竞争窗口的加倍和重置，使无线局域网的性能达到最优，并利用Markov
有点老了，GOOGLE来的文章 THE IEEE 802.11 [1] is the first international standard for wireless local-area networks (WLANs) and it has been used widely in most commercialWLANproducts available in the market. The IEEE 802.11 MAC specifies two different medium a
IEEE 802.11b provides a means for allocating a part of the radio channel bandwidth to some hosts (PCF - Point Coordination Function), the commonly available access method (DCF - Distributed Coordination Function) uses the CSMA/CA protocol to share t
We report an optical probe based on a single double-clad fiber (DCF), which is suitable for fluorescence spectroscopy. The excitation light is delivered through the small diameter core of the DCF and the excited fluorescence light is collected by th
