DUAL-STATE LOS / NLOS CLASSIFIER

Abstract

A multi-environment LOS / NLOS classifier 24 is proposed in a ULB telemetry device. It has two stages: an environment classifier (241) and a LOS / NLOS classifier (242). The environment classifier includes a CNN (241a) fed by the CIR of a received radio signal, cascaded with an MLP (241b) also fed by a set (SET_1) of statistical features extracted from the CIR by a dedicated unit (23). The environment classifier provides an environment class (ENV_ID) to the LOS / NLOS classifier, typically an LP, which also receives as input the output of the CNN and another set (SET_2) of statistical and physical features extracted from the CIR. The environment class (ENV_ID) can form a model input for the MLP operating as a LOS / NLOS classifier, or be a modulation parameter of the MLP, typically a bias or a weight modification factor for the MLP. Figure for the abstract: Figure 4