Portable and High Precision Channel Measurement and Modeling for MANET in Port Yards

The mobile ad-hoc network (MANET) under port yards relies heavily on the channel information between small communication nodes. However, it remains a challenging problem to deploy traditional large channel measurement equipment on small nodes. In addition, the wireless channel between nodes exhibits strong spatial and temporal variation characteristics. Consequently, conducting channel measurement and modeling in this scenario presents dual challenges of the equipment portability and channel modeling accuracy. To address the portability of measurement equipment, this paper investigates the highly portable and high-precision channel measurement method based on the universal software radio peripheral (USRP) and analyzes the influence of metal structures on the large-scale and small-scale parameters. To address the problem of low accuracy of the ray-tracing channel model due to the high complexity of the scenario, we propose an optimal parameter search method based on the channel measurement data by identifying the key simulation parameters of the ray-tracing channel model. By searching for the optimal values of the key simulation parameters, the channel model is iteratively calibrated. The experimental results show that our proposed model is suitable for fitting the path loss with a double-slope model in the MANET scenario, where the multipath effect caused by the metal structure results in a multi-peak distribution of the average power delay profile. The results also show that the proposed optimal parameter search method significantly improves the agreement between the simulation values of path loss and RMS delay spread with the measured values, such that the accuracy and universality of the channel model can be improved.