Distributed Network Reconfiguration in Response to Jamming at HF

The use of relays is known to increase the resistance of communication links to interference. In a multi-user network it is necessary to establish robust management techniques that allow the users to take advantage of the relaying power a network inherently possesses. In this paper we consider an Intra Task Force (ITF) Network that operates at HF. We employ a network architecture that provides for the automated selection of relay nodes without the need for a central controller. Under this architecture the network reorganizes itself in response to topology changes such as those that result from jamming. Communication range models suitable for a jammed HF channel are presented. We demonstrate that the combination of spread spectrum signaling, error correcting coding, path redundancy through frequency diversity, and adaptive relaying using automated network restructuring provide this network with a strong defense against jamming.