Adaptive mode selection for bidirectional relay networks - Fixed rate transmission

Vahid Jamali, Nikola Zlatanov, Robert Schober

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)


In this paper, we consider the problem of sum throughput maximization for bidirectional relay networks with block fading. Thereby, user 1 and user 2 exchange information only via a relay node, i.e., a direct link between both users is not present. We assume that channel state information at the transmitter (CSIT) is not available and/or only one coding and modulation scheme is used at the transmitters due to complexity constraints. Thus, the nodes transmit with a fixed predefined rate regardless of the channel state information (CSI). In general, the nodes in the network can assume one of three possible states in each time slot, namely the transmit, receive, and silent state. Most of the existing protocols assume a fixed schedule for the sequence of the states of the nodes. In this paper, we abandon the restriction of having a fixed and predefined schedule and propose a new protocol which, based on the CSI at the receiver (CSIR), selects the optimal states of the nodes in each time slot such that the sum throughput is maximized. To this end, the relay has to be equipped with two buffers for storage of the information received from the two users. Numerical results show that the proposed protocol significantly outperforms the existing protocols.

Original languageEnglish
Title of host publicationIEEE ICC 2014 - Wireless Communications Symposium
EditorsAbbas Jamalipour
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages7
ISBN (Electronic)9781479920037
ISBN (Print)9781479920051
Publication statusPublished - 2014
Externally publishedYes
EventIEEE International Conference on Communications 2014: Communications: Centrepoint of the Digital Economy - Sydney, Australia
Duration: 10 Jun 201414 Jun 2014 (IEEE Conference Proceedings)


ConferenceIEEE International Conference on Communications 2014
Abbreviated titleICC 2014
OtherIEEE International Conference on Communications, ICC 2014, Sydney, Australia.

The ICC is a flagship conference of the IEEE Communications Society and represents one of the largest gatherings of researchers and industry professionals in the field of communications in the world. This year’s conference is no exception and brings together more than 1500 delegates from around the globe to discuss the latest advances in this vibrant and constantly evolving field.
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