Closed-form semi-blind receiver for MIMO relay systems using double Khatri-Rao space-time coding

Abstract : In this letter, we consider a one-way two-hop AF relaying scheme employing two independent Khatri-Rao space-time (KRST) codings at the source and relay nodes. The signals received at destination form a fourth-order tensor whose dimensions correspond to four signal diversities, and which satisfies a nested PARAFAC model. Exploiting this nested structure, we derive two matrix unfoldings expressed in terms of two Khatri-Rao products which are used to propose a closed-form semi-blind receiver allowing to jointly estimate the information symbols and the individual channels. A numerical analysis shows that this new receiver achieves a substantial computational complexity reduction over an iterative (ALS-based) semi-blind receiver, especially in presence of a great number of source and/or relay antennas.
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Contributor : Gérard Favier <>
Submitted on : Friday, May 6, 2016 - 12:54:20 AM
Last modification on : Monday, November 5, 2018 - 3:52:01 PM

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Leandro Ronchini Ximenes, Gérard Favier, André de Almeida. Closed-form semi-blind receiver for MIMO relay systems using double Khatri-Rao space-time coding. IEEE Signal Processing Letters, 2016, 23 (3), pp.316 - 320 ⟨10.1109/LSP.2016.2518699⟩. ⟨hal-01312376⟩

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