Non-Orthogonal Access with Random Beamforming and Intra-Beam SIC for Cellular MIMO Downlink

We investigate non-orthogonal access with a successive interference canceller (SIC) in the cellular multiple-input multiple-output (MIMO) downlink for systems beyond LTE-Advanced. Taking into account the overhead for the downlink reference signaling for channel estimation at the user terminal in the...

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Bibliographic Details
Published in2013 IEEE 78th Vehicular Technology Conference (VTC Fall) pp. 1 - 5
Main Authors Higuchi, Kenichi, Kishiyama, Yoshihisa
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2013
Subjects
Array signal processing
Encoding
Interference
Receivers
Resource management
Silicon carbide
Throughput
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Summary:We investigate non-orthogonal access with a successive interference canceller (SIC) in the cellular multiple-input multiple-output (MIMO) downlink for systems beyond LTE-Advanced. Taking into account the overhead for the downlink reference signaling for channel estimation at the user terminal in the case of non-orthogonal multiuser multiplexing and the applicability of the SIC receiver in the MIMO downlink, we propose intra-beam superposition coding of a multiuser signal at the transmitter and the spatial filtering of inter-beam interference followed by the intra-beam SIC at the user terminal receiver. The intra-beam SIC cancels out the inter-user interference within a beam. Furthermore, the transmitter beamforming (precoding) matrix is controlled based on open loop-type random beamforming, which is very efficient in terms of the amount of feedback information from the user terminal. Simulation results show that the proposed non-orthogonal access scheme with random beamforming and the intra-beam SIC simultaneously achieves better sum and cell-edge user throughput compared to orthogonal access, which is assumed in LTE-Advanced.
ISSN:1090-3038
DOI:10.1109/VTCFall.2013.6692307