Measuring and modeling the wideband mobile channel for above the sea propagation paths

This paper presents the results on mobile channel characterization for the above the sea propagation paths at 1.9 GHz. The study is based on measurement campaigns conducted in various locations, carefully selected in order to cover all kind of environments that can be met in the Aegean Sea. The purpose was to model the over-the-sea channel. This study presents conclusions and results on large scale as well as on small scale characterization (time dispersive and time variant nature of the channel). Large scale modeling was accomplished with the use of the log-distance model. As far as the time dispersive nature of the channel is concerned, the study focuses on the Power Delay Profile (PDP). A simple methodology for predicting the delays of possible incoming signal echoes is also included. Moreover, mean excess delay and rms delay spread were calculated and empirical cumulative density functions of these quantities for each group were estimated. Finally the envelope distribution for each identified path (direct or not) was estimated. Results on the average estimated K-factor for various types of environment are also presented.