406,369 research outputs found
Empirical Coordination with Two-Sided State Information and Correlated Source and State
The coordination of autonomous agents is a critical issue for decentralized
communication networks. Instead of transmitting information, the agents
interact in a coordinated manner in order to optimize a general objective
function. A target joint probability distribution is achievable if there exists
a code such that the sequences of symbols are jointly typical. The empirical
coordination is strongly related to the joint source-channel coding with
two-sided state information and correlated source and state. This problem is
also connected to state communication and is open for non-causal encoder and
decoder. We characterize the optimal solutions for perfect channel, for
lossless decoding, for independent source and channel, for causal encoding and
for causal decoding.Comment: 5 figures, 5 pages, presented at IEEE International Symposium on
Information Theory (ISIT) 201
Explaining the Diffusion of Web-Based Communication Technology among Congressional Offices: A Natural Experiment Using State Delegations
Do legislators learn to use new communication technologies from each other? Using data from the official homepages of members of the U.S. House of Representatives, we test whether web-based communication technology diffuses through congressional state delegations. We use a natural experimental design that exploits ignorable state boundaries to distinguish between causal diffusion processes and spatial heterogeneity. Using nonlinear conditional autoregressive models for the statistical test, we find that web communication technology practices are weakly driven by communication within state delegations, and with the effect slightly more pronounced among Democrats than among Republicans.
Coordination in State-Dependent Distributed Networks: The Two-Agent Case
This paper addresses a coordination problem between two agents (Agents
and ) in the presence of a noisy communication channel which depends on an
external system state . The channel takes as inputs both agents'
actions, and and produces outputs that are observed
strictly causally at Agent but not at Agent . The system state is
available either causally or non-causally at Agent but unknown at Agent
. Necessary and sufficient conditions on a joint distribution
to be implementable asymptotically (i.e, when the number
of taken actions grows large) are provided for both causal and non-causal state
information at Agent .
Since the coordination degree between the agents' actions, and
, and the system state is measured in terms of an average
payoff function, feasible payoffs are fully characterized by implementable
joint distributions. In this sense, our results allow us to derive the
performance of optimal power control policies on an interference channel and to
assess the gain provided by non-causal knowledge of the system state at Agent
.
The derived proofs readily yield new results also for the problem of
state-amplification under a causality constraint at the decoder.Comment: Published in 2015 IEEE International Symposium on Information Theor
A Learning Theoretic Approach to Energy Harvesting Communication System Optimization
A point-to-point wireless communication system in which the transmitter is
equipped with an energy harvesting device and a rechargeable battery, is
studied. Both the energy and the data arrivals at the transmitter are modeled
as Markov processes. Delay-limited communication is considered assuming that
the underlying channel is block fading with memory, and the instantaneous
channel state information is available at both the transmitter and the
receiver. The expected total transmitted data during the transmitter's
activation time is maximized under three different sets of assumptions
regarding the information available at the transmitter about the underlying
stochastic processes. A learning theoretic approach is introduced, which does
not assume any a priori information on the Markov processes governing the
communication system. In addition, online and offline optimization problems are
studied for the same setting. Full statistical knowledge and causal information
on the realizations of the underlying stochastic processes are assumed in the
online optimization problem, while the offline optimization problem assumes
non-causal knowledge of the realizations in advance. Comparing the optimal
solutions in all three frameworks, the performance loss due to the lack of the
transmitter's information regarding the behaviors of the underlying Markov
processes is quantified
Tripartite quantum state violating the hidden influence constraints
The possibility to explain quantum correlations via (possibly) unknown causal
influences propagating gradually and continuously at a finite speed v > c has
attracted a lot of attention recently. In particular, it could be shown that
this assumption leads to correlations that can be exploited for superluminal
communication. This was achieved studying the set of possible correlations that
are allowed within such a model and comparing them to correlations produced by
local measurements on a four-party entangled quantum state. Here, we report on
a quantum state that allows for the same conclusion involving only three
parties.Comment: 7 pages, essentially published version, updated acknowledgment
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