This project is concerned with the cross-layer design of a video transmission system for use over tactical, mobile channels. The research is concerned with effects of signal modulation at the physical layer, including the use of spread spectrum and forward error control (FEC), to ensure reliable communications over channels that are dominated by both multipath/fading and intentional spoofing and jamming. We assume a cluster-head-based cognitive radio (CR) at the MAC layer, and unequal protection techniques at the application layer to allow for efficient video compression and reliability. Much of our research, as described in detail in two publications which are included with this report, considers a generic source, and emphasizes the twofold vulnerability of a tactical CR system to a sufficiently intelligent intentional adversary, namely spoofing in the spectrum sensing mode, and jamming in the data transmission mode. We take the objective of the adversary to be the minimization of the throughput of the desired signal, and this leads naturally into the second phase of the research, in which the generic source is replaced with a video source.
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