Performance of IR UWB cross layer ranging protocols under on body channel models with body area networks
This paper deals with the positioning performance of the 3 Way ranging protocol (3 WR) in a wireless body area network (WBAN) The purpose is to propose a new cooperative algorithm to improve the number of estimated positions with a conditional permutation of the on body anchors. To do so, we first evaluate and analyze the positioning success rate under a realistic mobility scenario and using two scheduling strategies: Broadcast single node localization (P2P B) and aggregated and broadcast (A&B) with a medium access control (MAC) layer based on time division multiple access (TDMA) The 3 WR estimates the distance between two nodes placed on the body with the transmission of three packets. The wireless transmission is based on impulse radio ultra wideband (IR UWB) However, these transactions can be lost through the WBAN channel leading into a "bad positioning service." We consider a physical layer based on IR UWB with three different channels: (1) an empirical theoretical model based on the on body CM3 path loss channel (Anechoic chamber) (2) a simulated channel calculated by ray tracing with the PyLayers simulator, and (3) an experimental channel model obtained by measurements. Our results show that the channel affects the positioning success rate that decreases as a function of the sensitivity threshold at the receiver. This can be solved with long and short term analysis for the choice of virtual anchors to increase the positioning performance.
Ann. des Telecommunications