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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TL;DR: A detailed discussion of the quantum interference effect transistor (QuIET), a proposed device which exploits the interference between electron paths through aromatic molecules to modulate the current flow.
Abstract: We give a detailed discussion of the quantum interference effect transistor (QuIET), a proposed device which exploits the interference between electron paths through aromatic molecules to modulate the current flow. In the off state, perfect destructive interference stemming from the molecular symmetry blocks the current, while in the on state, the current is allowed to flow by locally introducing either decoherence or elastic scattering. Details of a model calculation demonstrating the efficacy of the QuIET are presented, and various fabrication scenarios are proposed, including the possibility of using conducting polymers to connect the QuIET with multiple leads.
117 citations
TL;DR: Application of convex hull is proposed to solve the problem of global tool interference avoidance in 5-axis sculptured surface machining and both the algorithms and the implementation are presented.
Abstract: In this paper, application of convex hull is proposed to solve the problem of global tool interference avoidance in 5-axis sculptured surface machining. Two different methods for interference checking have been developed. Quick Feasibility Checking is used to find a conservative feasible tool orientation by using the control mesh of a sculptured surface. Detailed Feasibility Checking uses exact surface to detect tool interference. A correction method for removing tool interference has also been developed. In this paper both the algorithms and the implementation are presented.
117 citations
TL;DR: Novel robust channel estimation algorithms exploiting path diversity in both angle and power domains are proposed, relying on a suitable combination of the spatial filtering and amplitude based projection.
Abstract: We address the problem of noise and interference corrupted channel estimation in massive MIMO systems. Interference, which originates from pilot reuse (or contamination), can in principle be discriminated on the basis of the distributions of path angles and amplitudes. In this paper, we propose novel robust channel estimation algorithms exploiting path diversity in both angle and power domains, relying on a suitable combination of the spatial filtering and amplitude based projection. The proposed approaches are able to cope with a wide range of system and topology scenarios, including those where, unlike in previous works, interference channel may overlap with desired channels in terms of multipath angles of arrival or exceed them in terms of received power. In particular, we establish analytically the conditions under which the proposed channel estimator is fully decontaminated. Simulation results confirm the overall system gains when using the new methods.
117 citations
TL;DR: Simulation results show that the proposed OIA scheme provides significant improvement in terms of sum rates, and does not require global channel state information, time/frequency expansion, and a number of iterations, thereby resulting in easier implementation.
Abstract: We introduce an opportunistic interference alignment (OIA) for cellular networks, where a user scheduling strategy is utilized in time-division duplexing uplink communication environments with time-invariant channel coefficients and multi-antenna base stations (BSs). In the OIA scheme, each BS opportunistically selects users who generate the minimum interference to the other BSs. More specifically, each BS broadcasts its pre-designed interference directions, e.g., orthonormal random vectors, to all the users in other cells. Then, each user computes the amount of its generating interference, affecting the other BSs, and feedbacks it to its home cell BS. Note that the proposed OIA does not require global channel state information, time/frequency expansion, and a number of iterations, thereby resulting in easier implementation. Simulation results show that the proposed scheme provides significant improvement in terms of sum rates.
116 citations
08 Dec 2008
TL;DR: In this paper, a symmetric K-user Gaussian interference channel with K transmitters and K receivers was studied, and a very strong interference regime was derived for this channel setup.
Abstract: This paper studies a symmetric K user Gaussian interference channel with K transmitters and K receivers. A "very strong" interference regime is derived for this channel setup. A "very strong" interference regime is one where the capacity region of the interference channel is the same as the capacity region of the channel with no interference. In this regime, the interference can be perfectly canceled by all the receivers without incurring any rate penalties. A "very strong" interference condition for an example symmetric K user deterministic interference channel is also presented.
116 citations