Analysis and Modeling of Errors and Losses over 802 . 11 B Networks

نویسنده

  • Syed Ali Khayam
چکیده

ANALYSIS AND MODELING OF ERRORS AND LOSSES OVER 802.11B NETWORKS By Syed Ali Khayam Inherent vulnerability of wireless networks renders them more susceptible to errors and losses than classical (wired) media. Some of these errors are not corrected by the physical layer and result in link layer packet drops. Design of wireless applications can benefit substantially from a thorough understanding of this error/loss phenomenon at the link layer. This work, within the context of high-bitrate communication, presents statistical modeling of errors and losses over an 802.11b (wireless) network. We introduce and employ an Entropy Normalized Kullback-Leibler (ENK) measure to evaluate the performance of the models. First, we propose a two-state Markov chain to capture the link layer packet loss behavior. Based on ENK, it is demonstrated that the two-state Markov chain yields a very suitable approximation of the packet loss patterns. We then focus on the bitlevel errors introduced by the channel. We employ the traditional modeling approach and model the process using k-order Full State Markov (FSM) chains (i.e., 2 states, k = 1, 2, ...., 14). The 2-state model provides a very good approximate of the error process. However, the complexity of this model renders it impractical. This leads to one of the key contributions of this work, and that is, a Zero-Crossing Markov (ZCM) chain which reduces the number of states from 2 (in the FSM case) to 14 while providing comparable performance.

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تاریخ انتشار 2003