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In this paper we introduced the technique of moving average time reversal communication and evaluated its performance using a MISO system. From the analysis, we conclude that the proposed TR technique is well suited to operate in complex multipath and noisy environment. Moving average TR improves the system performance in noisy environment and also helps in countering the timing error, though the...
This paper presents the results of research exploring compact antenna design techniques for a desired 10:1 bandwidth in the Very High Frequency (VHF) band for remote sensing applications. A relatively compact antenna array has been developed to efficiently receive arbitrary RF signals across the entire 30 to 300 MHz VHF spectrum. Specifically, the antenna fits within a 3 meter cube, is capable of...
This paper presents research exploring design techniques for a single compact antenna for the efficient reception of arbitrary RF signals across the 30-300 MHz VHP spectrum, i.e. a large bandwidth in a low frequency band.
The properties and performance of a technique, called time reversal, for co-operative communication on power-constrained wireless sensor networks are studied. A brief discussion of the optimality properties of this approach is presented, and performance is studied experimentally via a simulated indoor environment containing multiple wireless sensors. Using numerical simulation, the behaviour of the...
Data gathering is one of the most important services provided by wireless sensor networks (WSNs). The predominant traffic pattern in data gathering services is many-to-one communication. Hence, it is critical to understand the limitations of many-to-one information flows and devise efficient data aggregation protocols to support prolonged operations in WSNs. In this paper, we demonstrate that a data...
The theoretical and practical performance limits of a 2-D ultra-wideband impulse-radio localization and tracking system operating in the far field are studied, with estimates of location being based on time-difference-of-arrival (TDOA) measurements. Performance is evaluated in the presence of errors in both the TDOA measurements and the sensor locations. The performance of both optimal (maximum-likelihood)...
The predominate traffic patterns in a wireless sensor network are many-to-one and one-to-many communication. Hence, the performance of wireless sensor networks is characterized by the rate at which data can be disseminated from or aggregated to a data sink. In this paper, we consider the data aggregation problem. We demonstrate that a data aggregation rate of Theta(logn/n) is optimal and that this...
In this paper, we study the feasibility of using a technique called time reversal for cooperative communication on wireless sensor networks. An indoor environment containing multiple wireless sensors is used as an example in which to test and demonstrate this approach. Using numerical simulations, we study the behavior of the peak power received at a target sensor as a function of the number of cooperating...
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