On-Line Wireless Channel Modeling for Performance Control Purposes

Performance control of applications running over wireless channels depends on ability to estimate statistical characteristics of wireless channels in real-time and represent them in terms of the model. Inherent time-varying dynamics of these characteristics pose a number of problems that have to be addressed before reliable estimates of the current channel state will be available. In this paper we consider the problem of on-line estimation of the state of the wireless channel based on bit error observations. The proposed approach is based on smoothing of the original error sequence which is shown to provide better description of the wireless channel for any given instant of time compared to conventional approaches. We also discuss applicability of the proposed approach in performance control of applications running over the air interface.