Topic
Interference (wave propagation)
About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.
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02 Sep 2005
TL;DR: This paper presents a greedy algorithm that computes an O(log n) approximation to the interference problem with connectivity requirement, where n is the number of nodes in the network, and shows how the algorithm can be generalized towards solving the interfered problem for network properties that can be formulated as a 0-1 proper function.
Abstract: Reducing interference is one of the main challenges in wireless communication, and particularly in ad hoc networks. The amount of interference experienced by a node v corresponds to the number of other nodes whose transmission range covers v. At the cost of communication links being dropped, interference can be reduced by decreasing the node's transmission power. In this paper, we study the problem of minimizing the average interference while still maintaining desired network properties, such as connectivity, point-to-point connections, or multicast trees. In particular, we present a greedy algorithm that computes an O(log n) approximation to the interference problem with connectivity requirement, where n is the number of nodes in the network. We then show the algorithm to be asymptotically optimal by proving a corresponding Ω(log n) lower bound that holds even in a more restricted interference model. Finally, we show how the algorithm can be generalized towards solving the interference problem for network properties that can be formulated as a 0-1 proper function.
80 citations
TL;DR: It is demonstrated that the various neural networks based on radial basis functions can be very useful for interference cancellation problems in which traditional linear cancelers may fail badly.
80 citations
TL;DR: This work experimentally demonstrates single photon interference at a ground station due to the coherent superposition of two temporal modes reflected by a rapidly moving satellite a thousand kilometers away and attest to the viability of photon temporal modes for fundamental tests of physics and quantum communication in space.
Abstract: Quantum interference arising from the superposition of states is striking evidence of the validity of quantum mechanics, confirmed in many experiments and also exploited in applications. However, as for any scientific theory, quantum mechanics is valid within the limits in which it has been experimentally verified. In order to extend such limits, it is necessary to observe quantum interference in unexplored conditions such as moving terminals at large distances in space. Here, we experimentally demonstrate single photon interference at a ground station due to the coherent superposition of two temporal modes reflected by a rapidly moving satellite a thousand kilometers away. The relative speed of the satellite induces a varying modulation in the interference pattern. The measurement of the satellite distance in real time by laser ranging allows us to precisely predict the instantaneous value of the interference phase. We then observed the interference patterns with a visibility up to 67% with three different satellites and with a path length up to 5000 km. Our results attest to the viability of photon temporal modes for fundamental tests of physics and quantum communication in space.
80 citations
TL;DR: In this paper, a multipole decomposition of the electromagnetic field is proposed to describe the scattering intensity of an arbitrary nanoscale object, which can be characterized by a multi-particle decomposition.
Abstract: Scattering of electromagnetic waves by an arbitrary nanoscale object can be characterized by a multipole decomposition of the electromagnetic field that allows one to describe the scattering intens...
80 citations
11 Oct 1993
TL;DR: The authors propose a multicarrier direct sequence spread spectrum system that is robustness against multipath fading, but to also achieve narrowband interference suppression; these advantages are obtained without the use of either an explicit RAKE structure or an interference suppression filter.
Abstract: The authors propose a multicarrier direct sequence spread spectrum system. By using this system, it is possible to get not only robustness against multipath fading, but to also achieve narrowband interference suppression; these advantages are obtained without the use of either an explicit RAKE structure or an interference suppression filter. The authors evaluate the performance of this system over both a frequency selective Rayleigh fading channel, and an additive white Gaussian noise channel in the presence of single tone interference. >
79 citations