Use of the Electromagnetic Spectrum (EMS) for a multitude of purposes is critical to the success of any net-enabled operation, especially when considering the terrestrial, aerial, and space domains. The combined pressures of increasing demand for services and less available bandwidth for all make it imperative that capabilities are developed for more integrated, flexible, and efficient use of available spectrum for all functions (communications, radar, sensors, electronic warfare) in all domains (terrestrial, aerial, and space).
Cognitive network design is a key technology enabler in the successful deployment of an effective Aerial Layer Network. Cognitive radios are machines that sense their environment (the radio spectrum and available resources) and respond intelligently to it. Coupled with the latest state-of-the-art high-data-rate transceiver technologies and adaptive signal processing, cognitive-radio-based networks will provide robust, secure methods of transporting massive amounts of information from source location (space, manned or unmanned vehicles, and ground) to multiple receivers in and out of theater to minimize latency and maximize information transfer and assimilation.
Key technologies being explored seek to define a successful path towards highly dynamic mobile ad-hoc networks with limited windows of connectivity and include, but are not limited to (1) adaptive signaling (waveforms); (2) adaptive interference avoidance and cancellation; (3) high-data-rate Doppler-cognizant design (in adaptation and operation); (4) data-hiding and covert authentication; (5) definition of end-to-end performance metrics from signal generation to network throughput/delays to mission effectiveness; (6) optimization of the above-stated end-to-end performance metrics; and (7) security, vulnerability assessment, and information assurance built into the design (hardware and software) from signaling to networking to mission/application execution (integrated cross-layer). Furthermore, the allocation of available (limited) link/network resources to meet mission-context requirements under stringent RF operational constraints necessitates novel wireless networking technologies to include distributed cross-layer design and optimization, dynamic spectrum access, components-based routing, IP-transparent networking (hybrid RF/optical protocols), and cooperative multipath routing and communications to provide robust connectivity.
Cognitive radio; Cognitive networks; Intelligent adaptation; Cross-layer design; Distributed control; Dynamic spectrum access;