Subspace Projection and Noncoherent Equalization in Multi-User Massive MIMO Systems
Conference: SCC 2015 - 10th International ITG Conference on Systems, Communications and Coding
02/02/2015 - 02/05/2015 at Hamburg, Germany
Proceedings: SCC 2015
Pages: 6Language: englishTyp: PDF
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Authors:
Fischer, Robert F. H. (Institut für Nachrichtentechnik, Universität Ulm, Ulm, Germany)
Stierstorfer, Clemens (Lehrstuhl für Informationsübertragung, Universität Erlangen-Nürnberg, Erlangen, Germany)
Mueller, Ralf R. (Lehrstuhl für Digitale Übertragung, Universität Erlangen-Nürnberg, Erlangen, Germany)
Abstract:
In this paper, noncoherent multi-user detection schemes in multi-user massive MIMO systems utilizing subspace projection are presented. We analyze the effects of such a projection in the noncoherent setting, in particular the interaction with the subsequent decision-feedback differential detection (DFDD) over the temporal dimensions and the noncoherent approach to decision-feedback equalization (nDFE) over the users. Based on an analysis of the statistics of the interference terms in autocorrelation-based noncoherent receivers, the receive processing is optimized. It is shown that the DFDD/nDFE scheme with prior subspace projection has a performance very close to that of coherent reception with perfect channel knowledge.