MU-MIMO in LTE Systems

Jonathan Duplicy, Biljana Badic, Rajarajan Balraj, Rizwan Ghaffar, Peter Horvath, Florian Kaltenberger, Raymond Knopp, Istvan Z. Kovacs, Hung Tuan Nguyen, Deepaknath Tandur, Guillaume Vivier

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A relatively recent idea of extending the benefits of MIMO systems to multi-user scenarios seems promising in the context of achieving high data rates envisioned for future cellular standards after 3G (3rd Generation). Although substantial
research has been done on the theoretical front, recent focus is on making Multi-User Multiple-Input Multiple-Output (MUMIMO) practically realizable. This article presents an overview of the different MU-MIMO schemes included / being studied in 3GPP standardization; from LTE (Long Term Evolution) to LTE-Advanced. MU-MIMO system concepts and implementation aspects have been studied here. Various low-complexity receiver architectures are investigated and their performance assessed through link-level simulations. Appealing performance offered by low-complexity interference aware (IA) receivers is notably emphasized. Furthermore, system level simulations for LTE
Release 8 are provided. Interestingly, it is shown that MU-MIMO only offers marginal performance gains with respect to singleuser MIMO. This arises from the limited MU-MIMO features included in Release 8 and calls for improved schemes for the upcoming releases.
Original languageEnglish
JournalEURASIP Journal on Wireless Communications and Networking
Publication statusPublished - 2011

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