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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23 Apr 2006
TL;DR: A general analytical model and an iterative method that predicts error probabilities and throughputs of packet transmissions with multiple senderreceiver pairs and offers a more accurate prediction than previous work is presented.
Abstract: While packet capture has been observed in real implementations of 802.11 devices, there is a lack of accurate models that describe the phenomenon. We present a general analytical model and an iterative method that predicts error probabilities and throughputs of packet transmissions with multiple senderreceiver pairs. Our model offers a more accurate prediction than previous work by taking into account the cumulative strength of interference signals and using the BER model to convert a signal to interference and noise ratio value to a bit error probability. This permits the analysis of packet reception at any transmission rate with interference from neighbors at any set of locations. We also prove that our iterative method converges, and we verify the accuracy of our model through simulations in Qualnet. Last, we present a rate assignment algorithm to reduce the average delay as an application of our analysis.
64 citations
Patent•
19 Feb 1989TL;DR: In this paper, an interferometer uses a short coherence length light source in such a way that the visibility of fringes produced varies as a function of the measurand, in order to provide a signal which represents the value of the fringes is calculated.
Abstract: An interferometer utilises a short coherence length light source in such a way that the visibility of fringes produced varies as a function of the measurand. In order to provide a signal which represents the value of the measurand, the visibility of the fringes is calculated.
64 citations
TL;DR: Channel allocation is studied using hypergraph theory to coordinate the interference between D2D pairs and cellular UEs, where an arbitrary number of D1D pairs are allowed to share the uplink channels with the cellularUEs.
Abstract: Device-to-device (D2D) communication has been recognized as a promising technique to offload the traffic for the evolved Node B (eNB). However, D2D transmission as an underlay causes severe interference to both the cellular and other D2D links, which imposes a great technical challenge to radio resource allocation. Conventional graph based resource allocation methods typically consider the interference between two user equipments (UEs), but they cannot model the interference from multiple UEs to completely characterize the interference. In this paper, we study channel allocation using hypergraph theory to coordinate the interference between D2D pairs and cellular UEs, where an arbitrary number of D2D pairs are allowed to share the uplink channels with the cellular UEs. Hypergraph coloring is used to model the cumulative interference from multiple D2D pairs, and thus, eliminate the mutual interference. Simulation results show that the system capacity is significantly improved using the proposed hypergraph method in comparison to the conventional graph based one.
64 citations
13 Nov 1995
TL;DR: This work derives the optimum receiver which jointly performs symbol detection and interference rejection and uses frequency diversity which allows the receiver to distinguish unjammed signal replicas from their jammed versions.
Abstract: Protection against in-band interference is required in antijam systems and when low level spread spectrum signals are overlaid on top of existing narrow-band users. We propose a secure spread-spectrum system whose optimum receiver is easy to build. We use frequency diversity which allows the receiver to distinguish unjammed signal replicas from their jammed versions. The system can also resist bandlimited partial-time jamming. The only choice left to a wise jammer to maximize our error probability is to spread his signal like ours. We derive the optimum receiver which jointly performs symbol detection and interference rejection. Side information, needed by this receiver, can easily be estimated. However, if the interference bandwidth is narrow enough compared to the signal bandwidth, side information is not needed by a simpler and near-optimum receiver. The bit error probability is evaluated for QPSK modulation and compared with that of direct sequence spread-spectrum.
64 citations
IBM1
TL;DR: In this paper, it was shown that destructive interference between two coherent excitation pathways from different optical harmonics, a fundamental and a third harmonic, inhibits resonance-enhanced multiphoton ionization.
Abstract: It is shown that destructive interference between two coherent excitation pathways from different optical harmonics, a fundamental and a third harmonic, inhibits resonance-enhanced multiphoton ionization. Once the role of the third harmonic is realized, the interference follows naturally from simple considerations of Fermi's "golden rule" and Maxwell's equations.
64 citations