909,062 research outputs found
LQG control with communication constraints
Caption title.Includes bibliographical references (p. 11).Supported by a Homi Bhabha Fellowship and by the U.S. Army Research Office. DAAL03-92-G-0115 (Center for Control Systems) DAAH04-95-1-0103 (Photonic Networks and Data Fusion)V.S. Borkar, Sanjoy K. Mitter
Ultra-Reliable and Low Latency Communication in mmWave-Enabled Massive MIMO Networks
Ultra-reliability and low-latency are two key components in 5G networks. In
this letter, we investigate the problem of ultra-reliable and low-latency
communication (URLLC) in millimeter wave (mmWave)-enabled massive
multiple-input multiple-output (MIMO) networks. The problem is cast as a
network utility maximization subject to probabilistic latency and reliability
constraints. To solve this problem, we resort to the Lyapunov technique whereby
a utility-delay control approach is proposed, which adapts to channel
variations and queue dynamics. Numerical results demonstrate that our proposed
approach ensures reliable communication with a guaranteed probability of
99.99%, and reduces latency by 28.41% and 77.11% as compared to baselines with
and without probabilistic latency constraints, respectively.Comment: Accepted May 12, 2017 by IEEE Communications Letters. Topic is
Ultra-Reliable and Low Latency Communication in 5G mmWave Network
Optimal Distributed Controller Synthesis for Chain Structures: Applications to Vehicle Formations
We consider optimal distributed controller synthesis for an interconnected
system subject to communication constraints, in linear quadratic settings.
Motivated by the problem of finite heavy duty vehicle platooning, we study
systems composed of interconnected subsystems over a chain graph. By
decomposing the system into orthogonal modes, the cost function can be
separated into individual components. Thereby, derivation of the optimal
controllers in state-space follows immediately. The optimal controllers are
evaluated under the practical setting of heavy duty vehicle platooning with
communication constraints. It is shown that the performance can be
significantly improved by adding a few communication links. The results show
that the proposed optimal distributed controller performs almost as well as the
centralized linear quadratic Gaussian controller and outperforms a suboptimal
controller in terms of control input. Furthermore, the control input energy can
be reduced significantly with the proposed controller compared to the
suboptimal controller, depending on the vehicle position in the platoon. Thus,
the importance of considering preceding vehicles as well as the following
vehicles in a platoon for fuel optimality is concluded
Proposition and validation of an original MAC layer with simultaneous medium accesses for low latency wireless control/command applications
Control/command processes require a transmission system with some
characteristics like high reliability, low latency and strong guarantees on
messages delivery. Concerning wire networks, field buses technologies like FIP
offer this kind of service (periodic tasks, real time constraints...).
Unfortunately, few wireless technologies can propose a communication system
which respects such constraints. Indeed, wireless transmissions must deal with
medium characteristics which make impossible the direct translation of
mechanisms used with wire networks. The purpose of this paper is to present an
original Medium Access Control (MAC) layer for a real time Low Power-Wireless
Personal Area Network (LP-WPAN). The proposed MAC-layer has been validated by
several complementary methods; in this paper, we focus on the specific
Simultaneous Guaranteed Time Slot (SGTS) part
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