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Multi-User Non-Coherent Detection for Downlink MIMO Communication

Current cellular technologies are based on the concept of coherent communication, in which the channel matrix used for demodulation is estimated via reference or pilot signals. Coherent systems, however, involve a significant increase of the signalling overhead, especially when the number of transmi...

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Published in:	IEEE signal processing letters 2014-10, Vol.21 (10), p.1225-1229
Main Authors:	Roger, Sandra, Calabuig, Daniel, Cabrejas, Jorge, Monserrat, Jose F.
Format:	Article
Language:	English
Subjects:	Channels Coherence Complexity theory Covariance matrices Demodulation Detectors Downlink Encoding Gain Mathematical models MIMO Multi-user detection non-coherent MIMO communication Pilots Receivers Signal processing space-time coding Time multiplexing
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creator	Roger, Sandra Calabuig, Daniel Cabrejas, Jorge Monserrat, Jose F.
description	Current cellular technologies are based on the concept of coherent communication, in which the channel matrix used for demodulation is estimated via reference or pilot signals. Coherent systems, however, involve a significant increase of the signalling overhead, especially when the number of transmission points is increased or when the mobile channel changes rapidly, which motivates the use of non-coherent techniques. This letter extends the use of non-coherent communications to a multi-user (MU) multiple-input multiple-output (MIMO) framework by combining superposition coding with a reduced-complexity detection method. Numerical results confirm that our scheme achieves higher user rates than non-coherent MU transmission based on time multiplexing. In addition to the well-known sum-rate gain of MU systems, an extra performance gain given by downlink non-coherent MU communication is shown and qualitatively justified.
doi_str_mv	10.1109/LSP.2014.2330854
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subjects	Channels Coherence Complexity theory Covariance matrices Demodulation Detectors Downlink Encoding Gain Mathematical models MIMO Multi-user detection non-coherent MIMO communication Pilots Receivers Signal processing space-time coding Time multiplexing
title	Multi-User Non-Coherent Detection for Downlink MIMO Communication
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