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A Distributed Relay Beamforming-enhanced TDMA System
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0001-6682-6559
2015 (English)In: Vehicular Technology Conference (VTC Spring), 2015 IEEE 81st , IEEE conference proceedings, 2015, 1-7 p.Conference paper (Refereed)
Abstract [en]

Token-passing wireless network protocols (TP-WNP) (e.g., EchoRing), designed for hard real-time systems, typically need to provide ultra-low-latency coupled with ultra-high-reliability guarantees. In this paper, we initiate a study to investigate the feasibility of distributed relay beamforming (DRBF) in a TP-WNP with the aim to enhance its reliability (and latency) performance even further. Specifically, we consider employing $N$ i) amplify-and- forward (AF), ii) decode-and-forward (DF) relays in a wireless network running a TP-WNP. The relays operate in FDD mode, and do distributed transmit beamforming to realize low-latency, highly- reliable communication between each of the $M$ source- destination pairs in the TP-WNP (a.k.a TDMA) system. The enablers/pre-requisites for the proposed DRBF-TDMA system are frequency, phase and timing synchronization among the relay nodes. To this end, we propose a novel distributed method for frequency synchronization among the AF/DF relay nodes operating in FDD mode. Furthermore, for oscillators with drift, we derive a rule of thumb which provides us the maximum relaying delay $T_{delay}$ up to which the proposed frequency synchronization method is effective. For phase and timing synchronization, we employ standard techniques from the literature. Our simulation results verify the analytical results, i.e., by means of proposed DRBF using $N$ AF (DF) relays, upto a factor of $N$ ($N^2$) gains in received SNR can be achieved, at each of the $M$ destination nodes in the proposed system.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015. 1-7 p.
National Category
URN: urn:nbn:se:kth:diva-165942DOI: 10.1109/VTCSpring.2015.7145599ISI: 000371404700015ScopusID: 2-s2.0-84940417190OAI: diva2:809172
IEEE Vehicular Technology Conference 2015 (VTC Spring 2015),11-14 May 2015, Glasgow, UK
ICT - The Next Generation

QC 20150715

Available from: 2015-04-30 Created: 2015-04-30 Last updated: 2016-04-11Bibliographically approved

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