PDF Icon Common-Message Broadcast Channels with Feedback in the Nonasymptotic Regime: Full Feedback

We investigate the maximum coding rate achievable on a two-user broadcast channel for the case where a common message is transmitted with feedback using either fixed-blocklength codes or variable-length codes. For the fixed-blocklength-code setup, we establish nonasymptotic converse and achievability bounds. An asymptotic analysis of these bounds reveals that feedback improves the second-order term compared to the no-feedback case. In particular, for a certain class of anti-symmetric broadcast channels, we show that the dispersion is halved. For the variable-length-code setup, we demonstrate that the channel dispersion is zero.
Original languageEnglish
JournalI E E E Transactions on Information Theory
ISSN0018-9448
StateSubmitted - 2018
Publication categoryResearch
Peer-reviewedNo

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PDF Icon Coded Pilot Access: A Random Access Solution for Massive MIMO Systems

Original languageEnglish
JournalI E E E Transactions on Wireless Communications
ISSN1536-1276
StateSubmitted - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Network Slicing in Industry 4.0 Applications: Abstraction Methods and End-to-End Analysis

Industry 4.0 refers to the fourth industrial revolution, and
introduces modern communication and computation technologies such as
5G, cloud computing and Internet of Things to industrial manufacturing
systems. As a result, many devices, machines and applications will
rely on connectivity, while having different requirements from the
network, ranging from high reliability and low latency to high data
rates. Furthermore, these industrial networks will be highly
heterogeneous as they will feature a number of diverse communication
technologies. In this article, we propose network slicing as a mechanism
to handle the diverse set of requirements to the network. We present
methods for slicing deterministic and packet-switched industrial
communication protocols at an abstraction level which is decoupled
from the specific implementation of the underlying technologies, and
hence simplifies the slicing of heterogeneous networks. Finally, we
show how network calculus can be used to assess the end-to-end properties
of the network slices.
Original languageEnglish
JournalI E E E Network
ISSN0890-8044
StateSubmitted - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Joint Compression, Channel Coding and Retransmission for Data Fidelity with Energy Harvesting

Joint Compression, Channel Coding and Retransmission for Data Fidelity with Energy Harvesting

Pielli, C., Stefanovic, C., Popovski, P. & Zorzi, M. 2018 In : IEEE Transactions on Communications. 66, 4, p. 1425 - 1439

Research output: Contribution to journalJournal article

Original languageEnglish
JournalIEEE Transactions on Communications
Volume66
Issue number4
Pages (from-to)1425 - 1439
ISSN0090-6778
DOI
StatePublished - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Frameless ALOHA with Reliability-Latency Guarantees

Frameless ALOHA with Reliability-Latency Guarantees

Stefanovic, C., Lazaro, F. & Popovski, P. 2018 Proceedings of IEEE Globecom 2017. IEEE

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceeding

Original languageEnglish
Title of host publicationProceedings of IEEE Globecom 2017
PublisherIEEE
Publication date2018
ISBN (Print)978-1-5090-5020-8
ISBN (Electronic)978-1-5090-5019-2
StatePublished - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Distributed proportional-fairness control in microgrids via blockchain smart contracts

Distributed proportional-fairness control in microgrids via blockchain smart contracts

Danzi, P., Angjelichinoski, M., Stefanovic, C. & Popovski, P. 2018 Smart Grid Communications (SmartGridComm), 2017 IEEE International Conference on. IEEE

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceeding

Original languageEnglish
Title of host publicationSmart Grid Communications (SmartGridComm), 2017 IEEE International Conference on
PublisherIEEE
Publication date2018
DOI
StatePublished - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Hybrid Precoding for Massive MIMO Systems in Cloud RAN Architecture with Capacity-Limited Fronthauls



PDF Icon 5G and Cellular Networks in the Smart Grid

5G and Cellular Networks in the Smart Grid

Nielsen, J. J., Jorguseski, L., Zhang, H., Ganem, H., Zhu, Z. & Popovski, P. 2018 (Accepted/In press) Transportation and Power Grid in Smart Cities: Communication Networks and Services. Wiley

Research output: Contribution to book/anthology/report/conference proceedingBook chapter

Wireless cellular networks will help Distribution System Operators (DSOs) to achieve observability below the substation level, which is needed to ensure stable operation in the smart grid. Both existing and upcoming cellular technologies are considered as candidates for helping to enable the smart grid. In the present chapter, we present the main features of both the non-3GPP technologies, IEEE 802.11ah, SigFox and LoRa, and the main features of past, current and future 3GPP technologies, namely releases <12 (High rate), 12-14 (IoT extensions) and 15-16 (5G). Additionally, we present the challenges and possible solutions for ensuring end-to-end security in smart grid systems.
Original languageEnglish
Title of host publicationTransportation and Power Grid in Smart Cities: Communication Networks and Services
PublisherWiley
Publication date2018
StateAccepted/In press - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Wireless Channel Modeling Perspectives for Ultra-Reliable Communications

Ultra-Reliable Communication (URC) is one of the distinctive features of the
upcoming 5G wireless communication. The level of reliability, going down to
packet error rates (PER) of $10^{-9}$, should be sufficiently convincing in
order to remove cables in an industrial setting or provide remote control of
robots with mission-critical function. In this paper we present elements of
physical and statistical modeling of the wireless channel that are relevant for
characterization of the lower tail of the channel Cumulative Distribution
Function (CDF). There are channel models, such as Two-Wave with Diffuse Power
(TWDP) or Suzuki, where finding the full CDF is not tractable. We show that,
for a wide range of channel models, the outage probability at URC levels can be
approximated by a simple expression, whose exponent depends on the actual
channel model. Furthermore, it is seen that the two-wave model leads to
pessimistic predictions of the fading in the region of ultra-reliable
communications, while the CDFs of models that contain diffuse components have
slopes that correspond to the slope of a Rayleigh fading. We provide analysis
of the receive antenna diversity schemes for URC-relevant statistics and obtain
a new expression for Maximum Ratio Combining (MRC) in Weibull channels.
Original languageEnglish
JournalIEEE Transactions on Wireless Communications
ISSN1536-1276
StateSubmitted - 2018
Publication categoryResearch
Peer-reviewedYes

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PDF Icon Generalized HARQ Protocols with Delayed Channel State Information and Average Latency Constraints

In many practical wireless systems, the signal-to-interference-and-noise ratio (SINR) that is applicable to a certain transmission, referred to as channel state information (CSI), can only be learned after the transmission has taken place and is thereby delayed (outdated). In such systems, hybrid automatic repeat request (HARQ) protocols are often used to achieve high throughput with low latency. This paper put forth the family of expandable message space (EMS) protocols that generalize the HARQ protocol and allow for rate adaptation based on delayed CSI at the transmitter (CSIT). Assuming a block-fading channel, the proposed EMS protocols are analyzed using dynamic programming. When full CSIT is available and there is a constraint on the average decoding time, it is shown that the optimal EMS protocol has a particularly simple operational interpretation and that the throughput is identical to that of the backtrack retransmission request (BRQ) protocol. We also devise EMS protocols for the case in which CSIT is only available through a finite number of feedback messages. The numerical results demonstrate that BRQ approaches the ergodic capacity quickly compared to HARQ, while EMS protocols with only three and four feedback messages achieve throughput that are only slightly worse than the throughput of BRQ.
Original languageEnglish
JournalI E E E Transactions on Information Theory
VolumePP
Pages (from-to)1
Number of pages34
ISSN0018-9448
DOI
StateE-pub ahead of print - 2018
Publication categoryResearch
Peer-reviewedYes

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