Somasundaram Niranjayan

Learn More
— Accurate wireless timing synchronization has been an extremely important topic in wireless sensor networks, required in applications ranging from distributed beam forming to precision localization and navigation. However, it is very challenging to realize, in particular when the required accuracy should be better than the runtime between the nodes. This(More)
—Two novel receiver structures which surpass the performance of the conventional matched filter receiver are proposed for ultra-wide bandwidth multiple access communications. The proposed receiver structures are derived based on a more appropriate statistical model for the multiple access interference than the generally used Gaussian approximation. Reasons(More)
—UWB multiple access interference is known to be non-Gaussian. Recent work has attempted to design better UWB detectors by approximating the distribution of the multiple access interference by a non-Gaussian noise model. In this paper, a non-linear detector is proposed, which is inspired by the empirical finding that the UWB multiple access interference can(More)
—The optimal linear Rake receiver for the detection of binary signals contaminated by symmetric alpha-stable noise is derived for 1 < α ≤ 2. The bit error rate improvements of the optimal linear Rake receiver over the maximal ratio combiner and the equal gain combiner are also derived in the form of signal-to-noise ratio advantage. The proposed receiver is(More)
—We present an algorithm for ultra-precise timing in large wireless networks. Our approach uses physical-layer UWB round-trip time-of-flight measurements to achieve precise timing between any two nodes, and fast re-timing based on UWB pulse broadcasting and diversity combining, allowing the precise timing to " propagate " through even large-scale networks.(More)
—Roundtrip time-of-arrival (ToA) measurements employing ultra-wideband (UWB) signals can provide high-precision ranging information. However, the accuracy is degraded by multiuser interference (MUI), in particular in the presence of multipath propagation. While the processing gain of time-hopping impulse radio (TH-IR) can be used to suppress the MUI, this(More)