Cellular LTE-A Technologies for the Future Internet-of-Things: Physical Layer Features and Challenges

Elsaadany, Mahmoud; Ali, Abdelmohsen; Hamouda, Walaa

doi:10.1109/comst.2017.2728013

Cited by 95 publications

(65 citation statements)

References 72 publications

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“…A higher end-to-end delay and/or outdated signaling information could lead to severe network congestion and even system-level breakdown in some delay-sensitive scenarios, e.g., vehicle-to-everything (V2X) communication networks and a variety of special MTC networks for control and security [27]- [29]. However, the powerful processing capability and reliable power supply might be hardly equipped in some new network paradigms, where intermediate nodes are with simple structures and powered by non-rechargeable batteries, e.g., wireless sensor networks (WSNs) and some application scenarios of the Internet of Things (IoT) [30], [31].…”

Section: B Df and Af Relaying: Pros And Consmentioning

confidence: 99%

OFDM-IM Based Dual-Hop System Using Fixed-Gain Amplify-and-Forward Relay With Pre-Processing Capability

Dang

Wen

et al. 2019

IEEE Trans. Wireless Commun.

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Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has recently attracted much researchers' attention due to its superior spectrum efficiency and reliability compared to the traditional OFDM. Cooperative decode-and-forward (DF) relaying has been incorporated with OFDM-IM, which provides a higher energy efficiency and better network coverage. However, it might not be feasible in realistic applications owing to the high system complexity and transmission delay rendered by complex decoding and channel estimation procedures. Therefore, in this paper, we propose a fixed-gain (FG) amplify-and-forward (AF) relay assisted OFDM-IM system, which does not need to perform complex decoding and channel estimation at the relay, but only requires a preprocessing capability at the relay, e.g., cyclic prefix (CP) removal and re-insertion. Therefore, the system complexity can be reduced and the forwarding delay as well as power consumption caused by processing at the relay also decline. We analyze the average outage probability, block error rate (BLER), and achievable rate of the proposed system and verify all analysis by numerical results. The proposed FG AF relay assisted OFDM-IM provides a simple solution to the implementation of OFDM-IM in new network paradigms, where nodes are simple, power-limited and/or complexity-limited. Index Terms-Orthogonal frequency-division multiplexing with index modulation (OFDM-IM), fixed-gain (FG) amplifyand-forward (AF) relaying, performance analysis, multi-carrier systems, the Internet of Things (IoT). I. INTRODUCTION

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Section: B Df and Af Relaying: Pros And Consmentioning

confidence: 99%

OFDM-IM Based Dual-Hop System Using Fixed-Gain Amplify-and-Forward Relay With Pre-Processing Capability

Dang

Wen

et al. 2019

IEEE Trans. Wireless Commun.

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“…The low-power technologies, for example, in the USA have been considered as an appropriate solution for the future power grid integration through a long distance, without absorbing high power energy. Low-power technologies have the functionality from LPWA [11] based on unlicensed band (e.g. LoRa) to licensed band (e.g.…”

Section: Low Power Wide Area Network Aspectsmentioning

confidence: 99%

Unleash Narrowband Technologies for Industrial Internet of Things Services

et al. 2019

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As the industrial market grows, it is becoming noticeable that there are many industrial Internet of things (IIoT) use cases for which existing technology can not meet the huge demand of machine connectivity. For example, in the utility market, there is a strong trend to adopt new technology that can support positive business use case scenarios for the efficient system operation and elaborate the dramatic increase of the services demand. Apart from this, most of utility grid applications required long-range, low-power, secure, and reliable communications, which is narrowband (NB) technology can be the dominant choice. To address these challenges, this article provides a new framework architecture to enable technical decision-makers to plan for NB-IIoT. Moreover, we highlight the key aspects of narrowband technology by focusing on the challenges, standardization, and requirements to facilitate the IIoT connectivity for industry revolutions. The motivation behind employing NB is to provide high level of reliability, better quality of service (QoS), and coverage. In particular, the article addresses the main applications of utility use cases under the NB umbrella, which can perform as a good bridge between utility services and the fundamental of communication infrastructure. The utility use cases based on emerging technology can support the full array of smart grid services that are required for both central and distributed operation systems. Finally, the article provides connectivity solutions for potential IIoT deployment aiming to define a new roadmap for the NB technology on specific industrial use cases.

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“…Therefore, a main challenging issue in MTC is to provide coverage enhancement (CE) to enhance battery life and improve the performance of MTC units suffering from poor coverage problems [5]. A variety of techniqUE such as symbol repetition, frequency hopping, and reference-signal boosting have been suggested to improve detection ability of MTC UE in a poor coverage area [6,7]. Since narrow bandwidth and single-antenna configuration are adopted in LTE-MTC, either frequential or spacial diversity cannot be used.…”

Section: Introductionmentioning

confidence: 99%

“…Using a repetition mechanism, the effect of time diversity can favorably enhance the capacity of the LTE-MTC network. However, such a repetition increases latency and wake-up time of MTC UE [7].…”

Section: Introductionmentioning

confidence: 99%

A Computationally Efficient Joint Cell Search and Frequency Synchronization Scheme for LTE Machine-Type Communications

2019

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The key features for future machine-type communication cellular systems facilitate low-power, low-cost, narrow-band, and wide-area systems. One of the challenging tasks to realize these requirements in machine-type communication cellular networks is a low-cost initial synchronization. To address this issue, this paper presents a reduced-complexity joint estimation of integer carrier frequency offset and cell identity for machine-type communication in the long-term evolution system. Using the conjugate property of a primary synchronization signal, joint search space of a number of hypotheses is reduced by two-thirds, facilitating low-complexity detection. The performance is assessed in terms of theoretical probability of detection failure. Simulation results confirm that the proposed estimation scheme achieves approximately the same performance as the conventional scheme with notably low complexity.

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Cellular LTE-A Technologies for the Future Internet-of-Things: Physical Layer Features and Challenges

Cited by 95 publications

References 72 publications

OFDM-IM Based Dual-Hop System Using Fixed-Gain Amplify-and-Forward Relay With Pre-Processing Capability

OFDM-IM Based Dual-Hop System Using Fixed-Gain Amplify-and-Forward Relay With Pre-Processing Capability

Unleash Narrowband Technologies for Industrial Internet of Things Services

A Computationally Efficient Joint Cell Search and Frequency Synchronization Scheme for LTE Machine-Type Communications

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