关键词: 超宽带, 无线传感器网络, 跨层设计, 优化模型

Abstract: Cross-layer design is a promising approach to promote the performance of wireless sensor networks.This paper studies an UWB-based wireless sensor networks and builds a cross-layer optimization model with joint consideration of MAC layer scheduling，PHY layer power control and of network layer.The optimization model takes advantage of unique properties of UWB technology，such as huge bandwidth，extremely low power spectral density and large processing gain in the presence of interference and intends to achieve the maximal data rate of whole network.Simulation results show that the optimal solution of cross-layer optimization model can increase the data rate of network obviously and power control in PHY layer has important influence on optimal solution.It demonstrates that it is feasible and effective to deal the cross-layer problem by building and resolving the optimization model and provides a novel approach to the address the data traffic issues for large-scale networks.

Key words: UWB, wireless sensor networks, cross-layer design, optimization model