Energy‐efficient, reliable wireless body area networks: cooperative diversity switched combining with transmit power control

Liang, Tian; Smith, David B.

doi:10.1049/el.2014.2648

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…The Nakagami m and Ω parameters of the input signals were estimated using a non-linear least squares routine programmed in MATLAB to fit (4), (6) and (8) to the measured data. To allow a direct comparison between the fading signals, the root mean square (rms) signal level was removed from the output envelope.…”

Section: Modeling Of the Fading Observed At The Combiner Outputmentioning

confidence: 99%

“…Over the last few years, a number of diversity techniques have been studied in the context of body centric communications [6][7][8][9][10]. In [6], switched diversity combining was employed in on-body communications systems.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], switched diversity combining was employed in on-body communications systems. Here an improvement in outage probability, a reduction in power consumption and a low switching rate were achieved using cooperative diversity with an SEC scheme.…”

Section: Introductionmentioning

confidence: 99%

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Switched Diversity Techniques for Indoor Off-Body Communication Channels: An Experimental Analysis and Modeling

Yoo

Cotton

Scanlon

2016

IEEE Trans. Antennas Propagat.

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This paper investigates the potential improvement in signal reliability for indoor off-body communications channels operating at 5.8 GHz using switched diversity techniques. In particular we investigate the performance of switch-andstay combining (SSC), switch-and-examine combining (SEC) and switch-and-examine combining with post-examining selection (SECps) schemes which utilize multiple spatially separated antennas at the base station. During the measurements a test subject, wearing an antenna on his chest, performed a number of walking movements towards and then away from a uniform linear array. It was found that all of the considered diversity schemes provided a worthwhile signal improvement. However, the performance of the diversity systems varied according to the switching threshold that was adopted. To model the fading envelope observed at the output of each of the combiners, we have applied diversity specific equations developed under the assumption of Nakagami-m fading. As a measure of the goodnessof-fit, the Kullback-Leibler divergence between the empirical and theoretical probability density functions (PDFs) was calculated and found to be close to 0. To assist with the interpretation of the goodness-of-fit achieved in this study, the standard deviation, σ, of a zero-mean, σ 2 variance Gaussian PDF used to approximate a zero-mean, unit variance Gaussian PDF is also presented. These were generally quite close to 1 indicating that the theoretical models provided an adequate fit to the measured data.

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Section: Modeling Of the Fading Observed At The Combiner Outputmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Switched Diversity Techniques for Indoor Off-Body Communication Channels: An Experimental Analysis and Modeling

Yoo

Cotton

Scanlon

2016

IEEE Trans. Antennas Propagat.

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“…The method is proposed [50] to reduce power consumption by data aggregation mechanism. The energy-efficient and reliable protocol has been proposed in [51].…”

Section: Wbans Design Challenges and Open Issuementioning

confidence: 99%

A Review of State-of-the-Art on Wireless Body Area Networks

Yazdi¹,

Hosseinzadeh²,

Jabbehdari³

2017

ijacsa

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Abstract-During the last few years, Wireless Body Area Networks (WBANs) have emerged into many application domains, such as medicine, sport, entertainments, military, and monitoring. This emerging networking technology can be used for e-health monitoring. In this paper, we review the literature and investigate the challenges in the development architecture of WBANs. Then, we classified the challenges of WBANs that need to be addressed for their development. Moreover, we investigate the various diseases and healthcare systems and current state-ofthe-art of applications and mainly focus on the remote monitoring for elderly and chronically diseases patients. Finally, relevant research issues and future development are discussed.

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“…Over the last few decades, a number of studies investigating spatial diversity techniques have been performed in the context of wearable or equivalently body-centric communications [7][8][9][10][11][12][13][14]. However, the majority of these have considered only PSC, EGC and MRC schemes [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Evaluation of Switched Combining Based Macro-Diversity for Wearable Communications Operating in an Outdoor Environment

Yoo

Cotton

Scanlon

et al. 2017

IEEE Trans. Wireless Commun.

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This paper investigates the potential improvement in signal reliability for outdoor wearable communications channels operating at 868 MHz using switched combining based macrodiversity. In this study, a number of different macro-diversity configurations consisting of two and four base stations were considered to help mitigate the impact of body shadowing upon a wearable node which was located on the central chest region of an adult male. During the field measurements, five different walking movements were performed and then analyzed to investigate the efficacy of using macro-diversity. It was found that all of the considered switched combining schemes including switch-and-stay combining (SSC), switch-and-examine combining (SEC) and SEC with post-examining selection (SECps) provided a worthwhile signal improvement when an appropriate switching threshold was adopted. The maximum diversity gain obtained in this study was found to be 19.5 dB when using four-base station SECps. The diversity gain, the number of path examinations and the number of path switches between base stations for the switched combiner output varied according to the determined switching threshold, highlighting the importance of the selection of an appropriate threshold level. Furthermore, the performance/complexity trade off is demonstrated. Finally, the fading behavior at the output of the switched diversity combiners was then characterized using the diversity specific equations developed under the assumption of independent and non-identically distributed Nakagami-m fading channels. Over all of the measurement scenarios considered in this study, the theoretical models provided an adequate fit to the fading observed at the output of the virtual switched combiner.

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Energy‐efficient, reliable wireless body area networks: cooperative diversity switched combining with transmit power control

Cited by 7 publications

References 2 publications

Switched Diversity Techniques for Indoor Off-Body Communication Channels: An Experimental Analysis and Modeling

Switched Diversity Techniques for Indoor Off-Body Communication Channels: An Experimental Analysis and Modeling

A Review of State-of-the-Art on Wireless Body Area Networks

An Experimental Evaluation of Switched Combining Based Macro-Diversity for Wearable Communications Operating in an Outdoor Environment

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