This paper presents a pioneering study based on a series of experiments on the operation of commercial Time-Division Long-Term Evolution (TD-LTE) systems in the presence of pulsed interfering signals in the 3550-3650 MHz band. TD-LTE operations were carried out in channels overlapping and adjacent to the high power SPN-43 radar with various frequency offsets between the two systems to evaluate the susceptibility of LTE to a high power interfering signal. Our results demonstrate that LTE communication using low antenna heights was not adversely affected by the pulsed interfering signal operating on adjacent frequencies irrespective of the distance of interfering transmitter. Performance was degraded only for very close distances (1-2 km) of overlapping frequencies of interfering transmitter.

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Traditionally wireless sensor networks (WSNs) employ active RF communication where the RF signal has to be generated at nodes, thus consuming a significant amount of energy. In contrast, employment of passive communication, where nodes backscatter a modulated version of the incident RF signal, offers great advantages including reducing the energy cost of communication. Existing example includes a traditional RFID system with active reader communicating directly with passive tags. In contrast, the proposed approach targets future, more advanced systems that support a generic backscatter communication. The inherent asymmetry in communication, reliance on external source of RF signal, and limited energy storage renders the traditional WSN schemes inadequate. Consequently, a novel multi-hop framework for passive backscattering communication is presented and analyzed in this paper. One of the main goals is to both maximize network capacity and ensure fair allocation of resources. This includes theoretical and simulation study of communication capacity and discussion of performance optimization potentials for routing schemes.

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