High Frequency (HF) Cognitive, Robust, Survivable and Secure (HF-CROSS)Communications

The goal of the proposed research is to develop and demonstrate novel algorithms and protocols for achieving: (i) robust long-range communications using high frequency (HF) signal reflections from the ionosphere, and (ii) dynamic multi-band multi-node ad hoc networking with a high degree of network-level predictability and survivability from electromagnetic pulses (EMPs) and nuclear explosion events. Specifically, the Phase I effort is aimed at designing and demonstrating innovative cognitive digital radio algorithms and networking protocols that will achieve data rates of over 300 Kbits/second across distances of over 500 miles, and significantly improved link predictability, stability, and survivability. The frequency range of operation for the proposed radio design is the HF band (3 - 30 MHz). The survivability will be achieved through our fully distributed, rapidly converging channel rendezvous algorithms without external, designated relays or controllers. The Phase II effort will center on adding novel features such as jamming resistance and data security, conducting a comprehensive simulation study, and implementing and demonstrating a multi-node prototype system with the SWaP-friendly antenna and a complete suite of multi-hop ad hoc networking protocol suite.