Direct path DoA and DoD finding through IR-UWB communications

Abstract

International audienceIn this paper, we present an algorithm that interprets the specificities of the received direct path, depending on the particular deformations due to antennas, in the context of Impulse Radio - Ultra Wide Band (IR-UWB) peer-to-peer communications. The goal is to jointly estimate direct path Direction of Arrival (DoA) and Direction of Departure (DoD). The proposed technique is mainly based on prior antenna characterisation and on the prediction of filtering effects due to direct path propagation. Simulation results are provided to illustrate the expected performance of such an algorithm in a simplified scenario. The proposed technique discloses new perspectives for DoA and DoD finding and potentially for wireless context-aware services

A Preliminary Investigation on Angular Parameters Estimation in a Simplified IR-UWB Indoor Multipath Scenario

“…The previous work [9] showed that there is not a oneto-one correspondence between waveforms shapes and their parameters, even when the pulse energy is higher than noise power density by several dBs. Therefore, a strategy based on multiple choices will be employed, in order to select just a set of candidates for each resolved path in the received signal, deferring the final estimation to a further stage.…”

“…Besides, it is suitable not to have an a priori fixed number of incident angles for each material N θpermat , as predicted received waveforms are not equally tolerant of noise (e.g. [9]). It is also expected that waveforms would not be equally tolerant of multipath overlap, as they show different temporal supports depending on the radiating directions (i.e.…”

“…Therefore, a strategy based on multiple choices will be employed, in order to select just a set of candidates for each resolved path in the received signal, deferring the final estimation to a further stage. Referring to [9], a Flex strategy with N c = 2 is applied here. In this paper, N dirperθ corresponds to N c as cited above.…”

“…Previous works [8] and [9] used a uniform partitioning of angular variables to be estimated (i.e. AoAs and AoDs).…”

“…Previously, an even simpler algorithm was employed in [9] in order to jointly estimate the DoA and the DoD for temporally well-isolated UWB pulses making the assumption of a free-space propagation. In both of previous works, estimates are provided using a Single Input Single Output (SISO) communication.…”