Time domain characteristics of multiple UWB 2D communication tiles

In this paper, we analyze time domain characteristics of multiple ultra-wide band (UWB) two-dimensional communication (2DC) tiles. The time domain characteristic, especially a root-mean-square (RMS) delay spread is important to properly design a physical layer protocol. In the tile system, signals propagate twice in a sheet-like communication medium at a source tile (signal transmitter unit) and a sink tile (signal receiver unit) that have the same communication characteristics. The signal propagation path indicates that the delay spread of the entire system can be estimated from one-tile characteristics. In order to clarify the delay property, the tile system is modeled and the delay spread are numerically simulated. The simulation results show that the delay spread of the total signal path is about 1.41 times longer than that of the source tile. As the next step, the delay spread of the multiple tiles are evaluated in experiments, which show consistency between the simulation and the measurements. These results provide the estimation on the RMS delay spread of the multi-tile system.