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Sensors, Volume 18, Issue 2

February 2018 - 362 articles

Cover Story: Pec and co-workers report a random access preamble (RAP) design technique for underwater acoustic cellular systems. After showing that the conventional RAP used in long term evolution (LTE) systems is not appropriate for underwater acoustic cellular systems, two different types of RAPs (RAP 1 and RAP 2) are proposed to detect the identity of underwater equipment/nodes (UE) and estimate the time delay between a UE and an underwater base station at the physical layer. The performance of RAP detection is investigated by analyzing the detection probabilities and false alarm probabilities of RAP 1 and RAP 2 in a Doppler environment. By evaluating the performances of RAP 1 and RAP 2 in various situations, it was concluded that RAP 2 is more suitable for underwater acoustic cellular systems. The AF and CAF analytically obtained in this paper are shown to be similar to those obtained using experimental data. View this paper
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Articles (362)

  • Article
  • Open Access
4 Citations
4,963 Views
28 Pages

Towards an Iterated Game Model with Multiple Adversaries in Smart-World Systems

  • Xiaofei He,
  • Xinyu Yang,
  • Wei Yu,
  • Jie Lin and
  • Qingyu Yang

24 February 2018

Diverse and varied cyber-attacks challenge the operation of the smart-world system that is supported by Internet-of-Things (IoT) (smart cities, smart grid, smart transportation, etc.) and must be carefully and thoughtfully addressed before widespread...

  • Feature Paper
  • Review
  • Open Access
59 Citations
14,039 Views
21 Pages

24 February 2018

Adequate selection of the electrode surface and the strategies for its modification to enable subsequent immobilization of biomolecules and/or nanomaterials integration play a major role in the performance of electrochemical affinity biosensors. Beca...

  • Article
  • Open Access
29 Citations
6,617 Views
22 Pages

24 February 2018

The Chinese GF-3 satellite launched in August 2016 is a Synthetic Aperture Radar (SAR) satellite that has the largest number of imaging modes in the world. It achieves a free switch in the spotlight, stripmap, scanSAR, wave, global observation and ot...

  • Article
  • Open Access
88 Citations
15,694 Views
28 Pages

24 February 2018

This paper aims to assess the use of Inertial Measurement Unit (IMU) sensors to identify gait asymmetry by extracting automatic gait features. We design and develop an android app to collect real time synchronous IMU data from legs. The results from...

  • Article
  • Open Access
14 Citations
6,015 Views
16 Pages

24 February 2018

The design and calibration of the cross-correlator are crucial issues for interferometric imaging systems. In this paper, an analog complex cross-correlator with output DC offsets and amplitudes calibration capability is proposed for interferometric...

  • Article
  • Open Access
15 Citations
7,216 Views
21 Pages

24 February 2018

For the objective of essentially decreasing computational complexity and time consumption of signal acquisition, this paper explores a resampling strategy and variable circular correlation time strategy specific to broadband multi-frequency GNSS rece...

  • Article
  • Open Access
279 Citations
17,059 Views
22 Pages

Comparison of Feature Learning Methods for Human Activity Recognition Using Wearable Sensors

  • Frédéric Li,
  • Kimiaki Shirahama,
  • Muhammad Adeel Nisar,
  • Lukas Köping and
  • Marcin Grzegorzek

24 February 2018

Getting a good feature representation of data is paramount for Human Activity Recognition (HAR) using wearable sensors. An increasing number of feature learning approaches—in particular deep-learning based—have been proposed to extract an effective f...

  • Article
  • Open Access
2 Citations
5,073 Views
15 Pages

23 February 2018

Although correlation filter (CF)-based visual tracking algorithms have achieved appealing results, there are still some problems to be solved. When the target object goes through long-term occlusions or scale variation, the correlation model used in...

  • Article
  • Open Access
8 Citations
6,505 Views
13 Pages

Using a Second Order Sigma-Delta Control to Improve the Performance of Metal-Oxide Gas Sensors

  • Lukasz Kowalski,
  • Joan Pons-Nin,
  • Eric Navarrete,
  • Eduard Llobet and
  • Manuel Domínguez-Pumar

23 February 2018

Controls of surface potential have been proposed to accelerate the time response of MOX gas sensors. These controls use temperature modulations and a feedback loop based on first-order sigma-delta modulators to keep constant the surface potential. Ch...

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Sensors - ISSN 1424-8220