Seamless Non-Line-Of-Sight Communications for Urban Warfare

This project will investigate candidate space-time coding schemes to be incorporated in a multiple-input multiple output two-way communication system that operates within an urban warfare environment. The main objective is to increase channel capacity to achieve high-quality video transmission using narrow signal bandwidths, typically deployed for voice channels. The investigation will determine the schemes most appropriate to the channel characteristics, including fading, multipaths, and Doppler, often encountered in the targeted operating environment. The selection of the number of antennas and the inter-element spacing at each transceiver will be guided by the potential restrictions that each end of the communications link places on the size, payload, and height of the antennas. Orthogonal codes, non-orthogonal codes, trellis and block codes, sensor approach or beamspace approach, and using none, partial, or full channel information for transmit diversity and coherent detection are among the schemes that will be examined. The project will also consider effective strategies for anti-jamming in view of the available number of spatio-temporal degrees of freedom and will investigate whether effective jammer suppression conforms with the target objective of high capacity and data rate.