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Game-Theory Enabled Radio Spectrum Management and Waveform Adaptation for Advanced Wideband Satellite Communications

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OBJECTIVE: Advanced game-theoretical frameworks and approaches for spectrum sensing and management in wideband satellite communications systems; Active countermeasures for adaptive RF interference and adversarial jamming. DESCRIPTION: Satellite communications systems and hybrid space-terrestrial systems are essential components for improved warfighting capabilities and enhanced defensive control over complex collaborative missions. Current military satellite communications infrastructure is multi-tiered to cater to different communication needs, ranging from wideband transmissions (i.e., supporting multi-channel, secure voice, and high data-rate communications) and protected systems with anti-jamming features and covertness, to narrowband systems for small and mobile users. To support growing user communication needs, the wideband segment of the military satellite communications will be essential to minimize user-to-user latency, increase wideband data rates and extend communications reach. In wideband satellite communications systems the unprecedented complexity and unpredictability of the operating environments, aggravated by electronic attacks and countermeasures, makes it crucial to develop cognitive spectrum management and agile waveform adaptation solutions that are not only context-aware and capable of learning and probing for subscriber distributions, quality of services, mission priorities and traffic patterns, but also are agile in waveform adaptation to provide active countermeasures for persistent and adaptive RF interferences and adversarial jamming. In this SBIR topic call, new approaches on pragmatic aspects of multiplayer game theory that would handle imperfect information, dynamic group formation, deception, non-stationary, and hidden objectives of opponents are particularly sought for cognitive radio spectrum management and waveform adaptation. Areas of science discovery and technology development include but are not limited to: (1) modeling of learning, interactions, and rational and non-rational strategies in the dynamics game context of cognitive radio spectrum management and anti-jamming countermeasures that can efficiently utilize satellite communication bandwidth, coherently interface with terrestrial systems, and effectively counteract persistent and adaptive jammers and interferences; (2) characterization and analysis of different game values subject to asymmetric information possessed by adversarial radios; and (3) scalable, approximate, algorithmic techniques that can potentially assess implications of cognitive radio decisions. For effective gaming, wideband spectrum sensing and cognition have to be integrated in order to gain awareness of the complex radio propagation environments and quickly capture the network dynamics and adversarial activities as well. In addition, adaptive waveform designs shall be able to perform autonomous frequency band selection and exploit time-delay propagation characteristics and antenna selectivity. Particular frequency radios of interest include SHF (Super-High Frequency) and EHF (Extremely-High Frequency). Other operational performance measures may include: i) protection and security with active anti-jamming, low probability of detection and interception and ii) survivability through space and terrestrial segment threats without damages and operating through threats without interruption. Lastly, transmitted signal powers, gains of antennas, and efficiency of receivers that all have impacts on throughput capacity can at least be planned for as a consideration. PHASE I: Identify feasible game-theoretical approaches for joint waveform adaptation, cognitive spectrum sensing & management in hierarchical spectrum sharing games with primary users, secondary users, persistent jammers and asymmetric information structures. Develop anti-jamming strategies by game-based means of frequency diversity, hybrid satellite-terrestrial networking & physical medium access layers. PHASE II: Refine Phase I results that make dynamic spectrum sharing and waveform adaptation games practical and relevant for analyzing non-rational decision making. Demonstrate a proof of concept on spectrum sharing throughput and susceptibility to jamming. Optimize the deployment of anti-jamming strategies based on sensitivities and biases of host communications policies. Conduct performance assessment on throughput capacity & channel capacity whether or not active anti-jamming measures are implemented. PHASE III: If successfully developed, the technology can potentially reduce technology risks in support of the Advanced Extremely High Frequency satellite systems to provide worldwide, secure, survivable, and jam-resistant communications for high-priority military ground, sea, and air assets. REFERENCES: 1. Defense Information Systems Agency, (n.d.)"Joint Spectrum Center,"Retrieved July 15, 2012. From http://www.disa.mil/Services/Spectrum/About-Us/Joint-Spectrum-Center. 2. K. Cook,"Current Wideband MILSATCOM Infrastructure and the Future of Bandwidth Availability,"IEEE A & E Systems Magazine, pp. 23-28, 2010. 3. Z. Tian, G. Leus, and V. Lottici,"Joint Dynamic Resource Allocation and Waveform Adaptation for Cognitive Networks,"IEEE Journal on Selected Areas in Communications, vol. 29, no. 2, pp. 443-454, 2011. 4. Z. Tian, G. Leus, V. Lottici,"Frequency Agile Waveform Adaptation for Cognitive Radio,"Proceedings of International Waveform Diversity and Design Conference, pp. 326-329, 2007. 5. X. Tian, Z. Tian, K. Pham, E. Blasch, and D. Shen,"Jamming/Anti-jamming Game with a Cognitive Jammer in Space Communication,"SPIE Defense and Security 2012: Sensors and Systems for Space Applications V. Edited by Pham, Khanh D.; Cox, Joseph L.; Howard, Richard T.; Zmuda, Henry. Proceedings of the SPIE, Volume 8385, pp. 83850Q-83850Q-10, 2012.
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