Direction finding of a compromised node in a spread-spectrum network

When a spread-spectrum receiver in a network discovers that it is processing a jamming signal transmitted by a compromised node, its first response is to attempt to identify the compromised node. In this paper, an adaptive array is used to find the direction to the jamming source despite the presence of interference signals transmitted by both legitimate network nodes and external sources. Unlike other direction-finding algorithms, the desired-signal classification (DESIC) algorithm requires no information or special assumptions about the interference signals to effectively cancel them and find the desired direction. Simulation experiments show that the DESIC algorithm provides an excellent performance in many scenarios, even when the received signals cannot be resolved by the widely used MUSIC algorithm.