Somasundaram Niranjayan

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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)
A new analytical method is introduced for the exact statistical modeling of multiple access interference (MAI), in time hopping pulse position modulation (TH-PPM) ultra wideband (UWB) systems. Based on this model the exact bit error rate (BER) is expressed in simple formulas. The proposed modeling of MAI considers complete asynchronism, and is also suitable(More)
We propose an adaptive transmit diversity scheme for UWB impulse radio (IR), based on free space signal combining, which provides a significant increase in performance compared to the conventional single antenna MRRC receiver. The proposed scheme employs multiple transmitters, which adjust their transmit delays adaptively, in order to achieve perfect(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)
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)
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. The(More)