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Communications in Interference Limited Networks pp 475–499Cite as

Generalized Multi-Carrier Waveforms in Two-Way Relay Systems

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Part of the book series: Signals and Communication Technology ((SCT))

Abstract

In this chapter, two-way relaying networks using Physical-Layer Net- work Coding (PLNC) are considered with practical constraints. In a Multiple Access (MA) phase, two users transmit messages simultaneously on the same physical resources. The relay constructs a relay message based on the superimposed receive signal of both users. This message is broadcasted to the users which are able to extract the desired data from the other user. However, as the relay is not able to resolve shifts in time and frequency for the individual channels, the transmission scheme needs to be adjusted, if perfect synchronization cannot be ensured. This chapter deals with the proper selection of waveforms for multi-carrier systems in the Two-Way-Relay Channel (TWRC) using PLNC. We address Generalized Frequency Division Multiplexing (GFDM) compared to Orthogonal Frequency Division Multi-plexing (OFDM) under practical constraints like Carrier Frequency Offsets (CFOs) and Timing Offsets (TOs) within double dispersive channels. For OFDM rectangular transmit filters are used, which have a broad spectrum shape and are sensitive to shifts, especially in frequency domain. GFDM applies Gaussian waveforms that are inherently less susceptible to synchronization offsets than theirs rectangular counterparts, but additional interference is introduced even in a perfectly synchronized and flat fading channel. Thus, interferences caused by the channel or by the non-orthogonal Gaussian impulse shape are treated by an equalizer at the relay. The simulation results show that the Gaussian waveform outperforms the conventional OFDM system if the nodes are not perfectly synchronized.

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Acknowledgments

This work was supported in part by the German Research Foundation (DFG) under Grants KU 1221/18-1 and WU 499/10-1 within the priority program “Communication in Interference Limited Networks (COIN)”, SPP 1397.

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Authors and Affiliations

  1. Department of Communications Engineering, University of Bremen, Otto-Hahn-Allee NW1, 28359, Bremen, Germany

    Matthias Woltering, Dirk Wübben & Armin Dekorsy

  2. Institute of Communications Engineering, University of Rostock, Richard-Wagner-Str. 31 (Haus 8), 18119, Rostock (Warnemünde), Germany

    Stephan Schedler & Volker Kühn

Authors
  1. Matthias Woltering
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  2. Stephan Schedler
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  3. Dirk Wübben
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Correspondence to Matthias Woltering .

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Editors and Affiliations

  1. Technische Universität München, Muenchen, Germany

    Wolfgang Utschick

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Woltering, M., Schedler, S., Wübben, D., Dekorsy, A., Kühn, V. (2016). Generalized Multi-Carrier Waveforms in Two-Way Relay Systems. In: Utschick, W. (eds) Communications in Interference Limited Networks. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-22440-4_20

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  • DOI: https://doi.org/10.1007/978-3-319-22440-4_20

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  • Print ISBN: 978-3-319-22439-8

  • Online ISBN: 978-3-319-22440-4

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