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  • 1.
    Dima, Elijs
    et al.
    Mid Sweden University, Sweden.
    Brunnstrom, Kjell
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Sjöström, Mårten
    Mid Sweden University, Sweden.
    Andersson, Mattias
    Mid Sweden University, Sweden.
    Edlund, Joakim
    Mid Sweden University, Sweden.
    Johansson, Mathias
    Alkit Communications AB, Sweden.
    Qureshi, Tahir
    HIAB AB, Sweden.
    Joint effects of depth‑aiding augmentations and viewing positionson the quality of experience in augmented telepresence2020In: Quality and User Experience, ISSN 2366-0139, Vol. 5, article id 2Article in journal (Refereed)
    Abstract [en]

    Virtual and augmented reality is increasingly prevalent in industrial applications, such as remote control of industrial machinery,due to recent advances in head-mounted display technologies and low-latency communications via 5G. However, theinfluence of augmentations and camera placement-based viewing positions on operator performance in telepresence systemsremains unknown. In this paper, we investigate the joint effects of depth-aiding augmentations and viewing positionson the quality of experience for operators in augmented telepresence systems. A study was conducted with 27 non-expertparticipants using a real-time augmented telepresence system to perform a remote-controlled navigation and positioningtask, with varied depth-aiding augmentations and viewing positions. The resulting quality of experience was analyzed viaLikert opinion scales, task performance measurements, and simulator sickness evaluation. Results suggest that reducing thereliance on stereoscopic depth perception via camera placement has a significant benefit to operator performance and qualityof experience. Conversely, the depth-aiding augmentations can partly mitigate the negative effects of inferior viewingpositions. However the viewing-position based monoscopic and stereoscopic depth cues tend to dominate over cues basedon augmentations. There is also a discrepancy between the participants’ subjective opinions on augmentation helpfulness,and its observed effects on positioning task performance.

  • 2.
    Pang, Xiaodan
    et al.
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Lin, Rui
    Chalmers University of Technology, Sweden.
    Zhang, L.
    Shanghai Jiao Tong University, China.
    Udalcovs, Aleksejs
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems.
    Xue, L.
    Chalmers University of Technology, Sweden.
    Schatz, R.
    KTH Royal Institute of Technology, Sweden.
    Westergren, U.
    KTH Royal Institute of Technology, Sweden.
    Xiao, S.
    Shanghai Jiao Tong University, China.
    Hu, W.
    Shanghai Jiao Tong University, China.
    Jacobsen, Gunnar
    RISE Research Institutes of Sweden.
    Popov, S.
    KTH Royal Institute of Technology, Sweden.
    Chen, J.
    Chalmers University of Technology, Sweden.
    200 Gbps/lane IM/DD Technologies for Short Reach Optical Interconnects2020In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 38, no 2Article in journal (Refereed)
    Abstract [en]

    Client-side optics are facing an ever-increasing upgrading pace, driven by upcoming 5G related services and datacenter applications. The demand for a single lane data rate is soon approaching 200 Gbps. To meet such high-speed requirements, all segments of traditional intensity modulation direct detection (IM/DD) technologies are being challenged. The characteristics of electrical and optoelectronic components, and the performance of modulation, coding and digital signal processing (DSP) techniques are being stretched to their limits. In this context, we witnessed technological breakthroughs in several aspects, including development of broadband devices, novel modulation formats and coding, and high-performance DSP algorithms for the past few years. A great momentum has been accumulated to overcome the aforementioned challenges. In this paper, we focus on IM/DD transmissions, and provide an overview of recent research and development efforts on key enabling technologies for 200 Gbps per lane and beyond. Our recent demonstrations of 200 Gbps short-reach transmissions with 4-level pulse amplitude modulation (PAM) and discrete multitone signals are also presented as examples to show the system requirements in terms of device characteristics and DSP performance. Apart from digital coherent technologies and advanced direct detection systems, such as Stokes-vector and Kramers-Kronig schemes, we expect high-speed IM/DD systems will remain advantageous in terms of system cost, power consumption and footprint for short reach applications in the short- to mid- term perspective.

  • 3.
    van Kasteren, Anouk
    et al.
    RISE Research Institutes of Sweden. Eindhoven University of Technology, Netherlands.
    Brunnstrom, Kjell
    RISE Research Institutes of Sweden, Digital Systems, Industrial Systems. Mid Sweden University, Sweden.
    Hedlund, John
    RISE Research Institutes of Sweden, Digital Systems, Prototyping Society.
    Snijders, Chris
    University of Technology Eindhoven, Netherlands.
    Quality of Experience Assessment of 360-degree video2020In: Human Vision and Electronic Imaging 2020 / [ed] Chandler, D.M. McCourt, M. Mulligan, J.B., Burlingame, CA, USA, 2020, article id HVEI-091Conference paper (Refereed)
    Abstract [en]

    The research domain on the Quality of Experience (QoE) of 2Dvideo streaming has been well established. However, a new videoformat is emerging and gaining popularity and availability: VR 360-degree video. The processing and transmission of 360-degree videosbrings along new challenges such as large bandwidth requirementsand the occurrence of different distortions. The viewing experienceis also substantially different from 2D video, it offers moreinteractive freedom on the viewing angle but can also be moredemanding and cause cybersickness. Further research on the QoEof 360-videos specifically is thus required. The goal of this study isto complement earlier research by (Tran, Ngoc, Pham, Jung, andThank, 2017) testing the effects of quality degradation, freezing, andcontent on the QoE of 360-videos. Data will be gathered throughsubjective tests where participants watch degraded versions of 360-videos through an HMD. After each video they will answerquestions regarding their quality perception, experience, perceptualload, and cybersickness. Results of the first part show overall ratherlow QoE ratings and it decreases even more as quality is degradedand freezing events are added. Cyber sickness was found not to bean issue.

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