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Turbo Receivers for Single User MIMO LTE-A Uplink

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Turbo Receivers for Single User MIMO LTE-A Uplink Turbo Receivers for Single User MIMO LTE-A Uplink Gilberto Berardinelli (1), Carles Navarro Mancho´n (1), Luc Deneire (1)(2)(3), Troels B.Sørensen (1), Preben Mogensen (1), Kari Pajukoski (4) (1) Department of Electronic Systems, Aalborg University, Denmark Email: [email protected] (2) Universite´ de Nice, Sophia Antipolis (3) Centre National de la Recherche Scientifique I3S,UMR 6070, France (4) Nokia-Siemens Networks, Oulu, Finland Abstract—The paper deals with turbo detection techniques for Single User Multiple-Input-Multiple-Output (SU MIMO) antenna schemes. The context is on the uplink of the upcoming Long Term Evolution - Advanced (LTE-A) systems. Iterative approaches based on Parallel Interference Cancellation (PIC) and Successive Interference Cancellation (SIC) are investigated, and a low-complexity solution allowing to combine interstream interference cancellation and noise enhancement reduction is proposed. Performance is evaluated for Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier Frequency Division Multiplexing (SC-FDM) as candidate uplink modulation schemes for LTE-A. Simulation results show that, in a 2x2 antenna configuration, the turbo processing allows a consistent improvement of the link performance, being SC-FDM the one having higher relative gain with respect to linear detection. The turbo receiver’s impact is however much reduced for both modulation schemes in a 2x4 configuration, due to the higher diversity gain provided by the additional receive antennas. Index Terms—LTE-A, MIMO, OFDM, SC-FDM, turbo re- ceiver, PIC, SIC I. INTRODUCTION The 3rd Generation Partnership Project (3GPP) is currently specifying the system requirements for the upcoming Long Term Evolution - Advanced (LTE-A) systems, aiming at target peak data rates of 1 Gbits/s in local areas and 100 Mbit/s in wide areas. While in the previous Release 8 [1] only single transmit antenna schemes have been standardized for the

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