Interference alignment for degrees of freedom improvement in 3-relay half-duplex systems

Seongho Park, Youngchai Ko, Kihong Park, Mohamed-Slim Alouini

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In a half-duplex relaying, the capacity pre-log factor is a major drawback in spectral efficiency. This paper proposes a linear precoding scheme and an alternate relaying protocol in a dual-hop half-duplex system where three relays help the communication between the source and the destination. In our proposed scheme, we consider a phase incoherent method in relays in which the source alternately transmits message signals to the different relays. In addition, we propose a linear interference alignment scheme which can eliminate the inter-relay interference resulted from the phase incoherence of relaying. Based on our analysis of degrees of freedom and our simulation results, we show that our proposed scheme achieves additional degrees of freedom compared to the conventional half-duplex relaying. © 2011 IEEE.
Original languageEnglish (US)
Title of host publication2011 8th International Conference on Information, Communications & Signal Processing
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Print)9781457700309
StatePublished - Dec 2011


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