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  • 1.
    Ahgren, Per
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    Jakobsson, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    A study of doubletalk detection performance in the presence of acoustic echo path changes2006In: IEEE transactions on consumer electronics, ISSN 0098-3063, E-ISSN 1558-4127, Vol. 52, no 2, 515-522 p.Article in journal (Refereed)
    Abstract [en]

    An efficient and well-performing double-talk detection (DTD) algorithm is a vital part of a practically working acoustic echo canceller. However, recent algorithms are typically evaluated using a static time-invariant room acoustic impulse response, omitting a proper treatment of the case when the acoustic path is changing. In this work, we introduce a common framework to objectively evaluate how path changes affect the DTD performance. Via extensive numerical simulations, we conclude that the main factor in acoustic path changes affecting the DTD performance for some of the more common DTD algorithms is variations in the damping of the acoustic path.

  • 2.
    Fafoutis, Xenofon
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Di Mauro, Alessio
    Orfanidis, Charalampos
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Dragoni, Nicola
    Energy-efficient medium access control for energy harvesting communications2015In: IEEE transactions on consumer electronics, ISSN 0098-3063, E-ISSN 1558-4127, Vol. 61, no 4, 402-410 p.Article in journal (Refereed)
    Abstract [en]

    While energy consumption is widely considered the primary challenge of wireless networked devices, energy harvesting emerges as a promising way of powering the Internet of Things (IoT). In the Medium Access Control (MAC) layer of the communication stack, energy harvesting introduces spatial and temporal uncertainty in the availability of energy. In this context, this paper focuses on the design and implementation of the MAC layer of wireless embedded systems that are powered by energy harvesting; providing novel protocol features and practical experiences to designers of consumer electronics who opt for tailoring their own protocol solutions instead of using the standards(1).

  • 3.
    Fafoutis, Xenofon
    et al.
    University of Bristol, UK.
    Di Mauro, Alessio
    Yubico, Sweden.
    Orfanidis, Charalampos
    University of Uppsala, Uppsala, Sweden.
    Dragoni, Nicola
    Örebro University, School of Science and Technology. Technical University of Denmark, Denmark.
    Energy-efficient medium access control for energy harvesting communications2015In: IEEE transactions on consumer electronics, ISSN 0098-3063, E-ISSN 1558-4127, Vol. 61, no 4, 402-410 p.Article in journal (Refereed)
    Abstract [en]

    While energy consumption is widely considered the primary challenge of wireless networked devices, energy harvesting emerges as a promising way of powering the Internet of Things (IoT). In the Medium Access Control (MAC) layer of the communication stack, energy harvesting introduces spatial and temporal uncertainty in the availability of energy. In this context, this paper focuses on the design and implementation of the MAC layer of wireless embedded systems that are powered by energy harvesting; providing novel protocol features and practical experiences to designers of consumer electronics who opt for tailoring their own protocol solutions instead of using the standards.

  • 4.
    Gidlund, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. Acreo AB.
    Ekling, Johan
    Acreo AB.
    VoIP and IPTV distribution over wireless mesh networks in indoor environment2008In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 54, no 4, 1665-1671 p.Article in journal (Refereed)
    Abstract [en]

    Wireless mesh networks (WMNs) will play an important role in the next-generation wireless communication systems because it can support broadband services with ubiquitous coverage by low power consumption. In this article, we will discuss and evaluate the possibility of distributing triple play (Voice-over-IP (VoIP), Internet and Internet Protocol TV (IPTV)) services over a wireless meshed network established in an indoor environment. We are using modified and reconfigured IEEE 802.11b/g access points in the experimental setup. The achieved results from both simulation and experimental setup show that it is possible to run three (3) standard definition (SD) IPTV channels simultaneously and also have VoIP connected over at least two hops with satisfied quality.

  • 5.
    Holenderski, Mike J.
    et al.
    Eindhoven University of Technology, Netherlands .
    Bril, Reinder J.
    Eindhoven University of Technology, Netherlands .
    Lukkien, Johan
    Eindhoven University of Technology, Netherlands .
    Reducing memory requirements in a multimedia streaming application2011In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 57, no 1, 145-152 p.Article in journal (Refereed)
    Abstract [en]

    This paper investigates memory management for real-time multimedia applications running on resource-constrained electronic devices. The target applications are comprised of a data-driven task chain with a time-driven head and tail and a bounded end-to-end latency. The necessary buffer capacities along the task chain are derived. Subsequently it is shown how a shared memory pool can reduce the total memory requirements of the whole application. The impact of a shared memory pool is also evaluated in the context of scalable applications. The general technique targeted at memory-constrained streaming systems is demonstrated with a video encoding example, showing memory savings of about 19%.

  • 6.
    van den Heuvel, Martijn
    et al.
    Eindhoven University of Technology, Netherlands .
    Bril, Reinder J.
    Eindhoven University of Technology, Netherlands .
    Schiemenz, Stephan
    Mälardalen University, School of Innovation, Design and Engineering. Brandenburg University of Technology, Germany .
    Hentschel, Christian
    Brandenburg University of Technology, Germany .
    Dynamic resource allocation for real-time priority processing applications2010In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 56, no 2, 879-887 p.Article in journal (Refereed)
    Abstract [en]

    Flexible signal processing on programmable platforms are increasingly important for consumer electronic applications and others. Scalable video algorithms (SVAs) using novel priority processing can guarantee real-time performance on programmable platforms even with limited resources. Dynamic resource allocation is required to maximize the overall output quality of independent, competing priority processing algorithms that are executed on a shared platform. In this paper, we describe basic mechanisms for dynamic resource allocation and compare the performance of different implementations on a general purpose platform.

  • 7.
    van den Heuvel, Martijn
    et al.
    Eindhoven University of Technology, Netherlands .
    Bril, Reinder J.
    Eindhoven University of Technology, Netherlands .
    Schiemenz, Stephan
    Brandenburg University of Technology, Germany .
    Hentschel, Christian
    Brandenburg University of Technology, Germany .
    Tempelaars, Coen
    Mälardalen University, School of Innovation, Design and Engineering. Eindhoven University of Technology, Netherlands .
    Real-Time Priority Processing on an Embedded CE Device2011In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 57, no 4, 1969-1977 p.Article in journal (Refereed)
  • 8.
    van den Heuvel, Martijn
    et al.
    Eindhoven University of Technology, Netherlands .
    Holenderski, Mike J.
    Eindhoven University of Technology, Netherlands .
    Bril, Reinder J.
    Eindhoven University of Technology, Netherlands .
    Lukkien, Johan
    Eindhoven University of Technology, Netherlands .
    Constant bandwidth supply for priority processing2011In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 57, no 2, 873-881 p.Article in journal (Refereed)
    Abstract [en]

    Today's consumer electronic devices feature multiple applications which have to share scarcely available resources. We consider a priority-processing- based video application, which comprises multiple scalable video algorithms (SVAs) that are executed on a shared, virtual platform. This application is given a guaranteed processor share by means of a constant-bandwidth server (CBS). A decision scheduler distributes the assigned processor share among the SVAs on a time-slot basis, with the aim to maximize their overall output quality. To correctly distribute this processor share based on fixed-sized time slots, we introduce the concept of a virtual timer. This timer only advances when its associated virtual platform is executing. Because priority processing can guarantee real-time performance even under fluctuating load, we apply a resource reclaiming mechanism to our CBS which makes it possible to efficiently exploit spare processor time.

  • 9.
    Yan, Hairong
    et al.
    Jönköping University.
    Huo, Hongwei
    Beijing Jiatong University.
    Xu, Youzhi
    Jönköping University.
    Gidlund, Mikael
    ABB Corporate Research.
    Wireless Sensor Network based e-health system - implementation and experimental results2010In: IEEE transactions on consumer electronics, ISSN 0098-3063, Vol. 56, no 4, 2288-2296 p.Article in journal (Refereed)
    Abstract [en]

    With the increasing number senior citizens, E-health is targeted for home use with the special requirements of being usable in everyday life and low cost. A wireless sensor network application is proposed here for 24 hour constant monitoring without disturbing daily activities of elderly people and their caretakers. In the system proposed, both fixed and body (mobile) sensors are used. Since not every elder likes to have a sensor board attached to him/her, and in many cases, he/she may not carry the sensor; the home sensor network independently would have the ability to monitor the health status and living environment based on the multisensor data analysis and fusion. A mixed positioning algorithm is proposed to determine where the elderly person is. The purpose of the positioning is to help the system to determine the person's activities and further to make decisions about his/her health status. The system could take care of two types of the basic needs of an elderly person: everyday needs as abnormal events and emergency alarms to doctors and caretakers through telephone, SMS and e-mail, and day to day requirements such as taking of medicine, having lunch, turn off the microwave oven, and so on. At same time, the system is sensitive to security and privacy issues.

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