Downlink Design for Spectrum Efficient IoT Network

Jia, Min; Yin, Zhisheng; Guo, Qing; Liu, Gongliang; Gu, Xuemai

doi:10.1109/jiot.2017.2734815

Cited by 82 publications

(29 citation statements)

References 29 publications

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“…Previous studies show that the path loss near a human body tends to be huge. The path loss exponent ranges from 3 to 4 in LOS transmission and 5 to 7 in NLOS transmission [37], [38], [39]. This leads to high energy consumption for long distance transmission.…”

Section: Intra-wban Communicationmentioning

confidence: 99%

A Self-Organized Dynamic Clustering Method and Its Multiple Access Mechanism for Multiple WBANs

Stewart

Han

et al. 2019

IEEE Internet Things J.

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Due to its wide application range and attractive features, Wireless Body Area Networks (WBAN) is considered as a revolutionary technology which is envisaged to change how people manage and think about their health and their life styles. In this paper, we propose a Self-organized Dynamic Clustering (SDC) method and its multiple access mechanism to mitigate the interference and improve the QoS in multiple WBANs environment. To the best of our knowledge, this is the first paper which focuses on the spectrum allocation for multiple WBANs. We borrow the concepts of cell and cluster from cellular networks to allocate the channels for different WBANs. The clustering is self-organized to improve the data transmission for intra-WBAN communication by the information exchange via inter-WBAN communication. Additionally, based on the cluster architecture, an inter-WBAN relaying (IWR) protocol for packets with low privacy or high reliability is also investigated. The simulation results show that SDC has better signal to interference ratio compared with existing framework. Besides, SDC and IWR also provide better QoS performance in terms of higher data packet delivery ratio and lower packet delay.

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Section: Intra-wban Communicationmentioning

confidence: 99%

A Self-Organized Dynamic Clustering Method and Its Multiple Access Mechanism for Multiple WBANs

Stewart

Han

et al. 2019

IEEE Internet Things J.

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“…Besides performance, complexity is another prime factor to consider. The total number of operations for the three schemes discussed above are counted using Algorithm 1, 2 and equation (9). Table II summarises the complexity of all schemes in terms of the number of complex additions and multiplications.…”

Section: Performance and Complexity Analysismentioning

confidence: 99%

“…Despite of the non-orthogonality, techniques generally used in wireless systems, such as channel coding, equalisation and detection have been applied to SEFDM. Indeed, significant spectral efficiency gains were demonstrated in experimental SEFDM test beds for wireless [4], optical/mm-wave [5], VLC system [6] [7], very high speed optical [8] and the downlink for Internet of Things (IoT) networks [9].…”

Section: Introductionmentioning

confidence: 99%

Robust Channel Estimation Methods for Spectrally Efficient FDM Systems

Ghannam

Darwazeh

2018

2018 IEEE 87th Vehicular Technology Conference (VTC Spring)

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This paper proposes and explores a novel channel estimation scheme for non-orthogonal multi-carrier signals and systems; spectrally efficient frequency division multiplexing (SEFDM), in which higher spectral efficiency is achieved by violating the orthogonality of its subcarriers. The proposed scheme is distinguished by its simplicity, low computational complexity, high accuracy and performance independent of the number of subcarriers and compression factor. The presented results demonstrate the efficacy of the proposed scheme by comparing its complexity and performance to other estimation schemes.

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“…T In the 4th generation (4G) [1] and 5th generation (5G) [2], orthogonal internet of things (IoT), such as orthogonal frequency division multiplexing (OFDM) based narrowband IoT (NB-IoT), is no longer efficient for next generation IoT (NG-IoT) requirements. Non-orthogonal signal waveforms, such as fast-orthogonal frequency division multiplexing (Fast-OFDM) [3], [4], [5], spectrally efficient frequency division multiplexing (SEFDM) [6], [7], [8], [9], filterbank based multicarrier (FBMC) [10], Half-Sinc [11], nonorthogonal frequency shift keying (FSK) [12] and Hilbert-pair waveform [13], bring benefits either in signal bandwidth saving or data rate improvement. The 4G/5G standards maintained the use of OFDM for NB-IoT as there are benefits of compatibility with the 4G/5G signal formats and the general benefits of multicarrier signals in simply and simultaneously correcting imperfect timing synchronization, local oscillator (LO) phase offset, sampling phase offset and other joint hardware/channel impairments.…”

Section: Introductionmentioning

confidence: 99%

Design and Prototyping of Hybrid Analog–Digital Multiuser MIMO Beamforming for Nonorthogonal Signals

Masouros

Darwazeh

2020

IEEE Internet Things J.

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To enable user diversity and multiplexing gains, a fully digital precoding multiple input multiple output (MIMO) architecture is typically applied. However, a large number of radio frequency (RF) chains make the system unrealistic to lowcost communications. Therefore, a practical three-stage hybrid analogue-digital precoding architecture, occupying fewer RF chains, is proposed aiming for a non-orthogonal IoT signal in lowcost multiuser MIMO systems. The non-orthogonal waveform can flexibly save spectral resources for massive devices connections or improve data rate without consuming extra spectral resources. The hybrid precoding is divided into three stages including analogue-domain, digital-domain and waveform-domain. A codebook based beam selection simplifies the analogue-domain beamforming via phase-only tuning. Digital-domain precoding can fine-tune the codebook shaped beam and resolve multiuser interference in terms of both signal amplitude and phase. In the end, the waveform-domain precoding manages the self-created inter carrier interference (ICI) of the non-orthogonal signal. This work designs over-the-air signal transmission experiments for fully digital and hybrid precoding systems on software defined radio (SDR) devices. Results reveal that waveform precoding accuracy can be enhanced by hybrid precoding. Compared to a transmitter with the same RF chain resources, hybrid precoding significantly outperforms fully digital precoding by up to 15.6 dB error vector magnitude (EVM) gain. A fully digital system with the same number of antennas clearly requires more RF chains and therefore is low power-, space-and cost-efficient. Therefore, the proposed three-stage hybrid precoding is a quite suitable solution to non-orthogonal IoT applications.Index Terms-Beamforming, multiple input multiple output (MIMO), multiuser, hybrid precoding, Internet of Things (IoT), non-orthogonal, software defined radio (SDR), prototyping.

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Downlink Design for Spectrum Efficient IoT Network

Cited by 82 publications

References 29 publications

A Self-Organized Dynamic Clustering Method and Its Multiple Access Mechanism for Multiple WBANs

A Self-Organized Dynamic Clustering Method and Its Multiple Access Mechanism for Multiple WBANs

Robust Channel Estimation Methods for Spectrally Efficient FDM Systems

Design and Prototyping of Hybrid Analog–Digital Multiuser MIMO Beamforming for Nonorthogonal Signals

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