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A limited feedback scheme based on spatially correlated channels for coordinated multipoint systems

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A limited feedback scheme based on spatially correlated channels for coordinated multipoint systems

dc.contributor.author	Domene, Fernando
dc.contributor.author	Piñero, Gema
dc.contributor.author	Botella Mascarell, Carmen
dc.contributor.author	González, Alberto
dc.date.accessioned	2021-09-02T14:29:06Z
dc.date.available	2021-09-02T14:29:06Z
dc.date.issued	2012
dc.identifier.citation	Domene, Fernando Piñero, Gema Botella Mascarell, Carmen González, Alberto 2012 A limited feedback scheme based on spatially correlated channels for coordinated multipoint systems Eurasip Journal On Wireless Communications And Networking 2012 176 1 15
dc.identifier.uri	https://hdl.handle.net/10550/80206
dc.description.abstract	High spectral efficiency can be achieved in the downlink of multi-antenna coordinated multi-point systems provided that the multiuser interference is appropriately managed at the transmitter side. For this sake, downlink channel information needs to be sent back by the users, thus reducing the rate available at the uplink channel. The amount and type of feedback information required has been extensively studied and many limited feedback schemes have been proposed lately. A common pattern to all of them is that achieving low rates of feedback information is possible at the cost of increasing complexity at the user side and, sometimes, assuming that some statistics of the channel are known. In this article, we propose a simple and versatile limited feedback scheme that exploits the spatial correlation at each multi-antenna base station (BS) without requiring any previous statistical information of the channel and without adding significant computational complexity. It is based on the separate quantization of the channel impulse response modulus and phase and it shows better mean square error performance than the standard scheme based on quantization of real and imaginary parts. In order to evaluate the performance of the downlink regarding multiuser interference management, different precoding techniques at the BSs, such as zero-forcing (ZF), Tomlinson-Harashima precoding (THP) and lattice reduction Tomlinson- Harashima precoding (LRTHP), have been evaluated. Simulations results show that LRTHP and THP present a higher robustness than ZF precoding against channel quantization errors but at the cost of a higher complexity at the BS. Regarding sum-capacity and bit error rate performances, our versatile scheme achieves better results than the standard one in the medium and high SNR regime, that is, in the region where quantization errors are dominant against noise, for the same feedback cost measured in bits per user.
dc.language.iso	eng
dc.relation.ispartof	Eurasip Journal On Wireless Communications And Networking, 2012, vol. 2012, num. 176, p. 1-15
dc.subject	Telecomunicació
dc.subject	Comunicació i tecnologia
dc.title	A limited feedback scheme based on spatially correlated channels for coordinated multipoint systems
dc.type	journal article	es_ES
dc.date.updated	2021-09-02T14:29:06Z
dc.identifier.doi	10.1186/1687-1499-2012-176
dc.identifier.idgrec	083981
dc.rights.accessRights	open access	es_ES