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Muhammad Sohaib Amjad, "Towards Low Latency and Bandwidth Efficient Communication in Wireless Systems," PhD Thesis, School of Electrical Engineering and Computer Science, TU Berlin (TUB), May 2021. (Advisor: Falko Dressler; Referees: Falko Dressler, Robert Weigel and Hsin-Mu Tsai)


The densely utilized sub-6 GHz spectrum is reaching critical saturation levels due to the growing number of wirelessly connected devices and their increasing demand for high-speed real-time content access. The ubiquitous connectivity and high data rates in the existing wireless architecture are, therefore, struggling, with both limited link-capacity and channel access. In this regard, infrastructure relays have also been considered for maintaining high-speed wireless connectivity and improved user experience. Nevertheless, due to the existing relaying structure’s half-duplex nature, higher latencies are typically experienced, especially in multi-hop scenarios. To address this issue, in-band Full-Duplex Relaying (FDR) has been proposed in the literature, which is still missing standardized implementations for experimenta- tion and evaluation purposes. The first part of the thesis fills this gap and presents an IEEE 802.11 a/g/p compliant FDR implementation in the GNU Radio framework. We first evaluate FDRs’ performance in a dual-hop scenario, with simulations and Software-Defined Radio (SDR)-based real-world experiments. We further consider FDR applicability in vehicular platooning and study its potential in sub-6 GHz and 77 GHz mmWave channels. Our results show that FDR substantially reduces the physical layer latency and transmission power requirements in a multi-hop system, provided that the looped self-interference is sufficiently suppressed. The second part of this thesis explores the spectrum beyond conventional RF for communications and investigate Visible Light Communication (VLC) as an access technology for bandwidth-efficient and low latency communications. We first present a flexible IEEE 802.11 compliant Vehicular-VLC (V-VLC) system, which utilizes com- mercial off-the-shelf hardware. Our real-time experiments in the outdoors during the daytime confirm that our system prevents the strong impact of daylight and demon- strates reliable communications for distances beyond 75 m, regardless of the time of the day. We then propose a novel indoor visible light-based communication and non-invasive sensing system with applications in industrial automation and Internet of Things (IoT) solutions. Our results show that integrating the two technologies only marginally lowers individual performance; however, the combined system is especially beneficial in radio-hostile and hazardous industrial environments.

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Muhammad Sohaib Amjad

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    author = {Amjad, Muhammad Sohaib},
    title = {{Towards Low Latency and Bandwidth Efficient Communication in Wireless Systems}},
    advisor = {Dressler, Falko},
    institution = {School of Electrical Engineering and Computer Science},
    location = {Berlin, Germany},
    month = {5},
    referee = {Dressler, Falko and Weigel, Robert and Tsai, Hsin-Mu},
    school = {TU Berlin (TUB)},
    type = {PhD Thesis},
    year = {2021},

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