Spatial separation of closely-spaced users in measured massive multi-user MIMO channels

Fully-synchronous measurements of a massive multi-user multiple-input multiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users located close to each other in line-of-sight (LOS) propagation conditions. The system...

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Bibliographic Details
Published in:2015 IEEE International Conference on Communications (ICC) pp. 1441 - 1446
Main Authors: Flordelis, Jose, Xiang Gao, Dahman, Ghassan, Rusek, Fredrik, Edfors, Ove, Tufvesson, Fredrik
Format: Conference Proceeding
Language:English
Published: IEEE 01.06.2015
Subjects:
Antenna arrays
Antenna measurements
Arrays
large-scale MIMO
linear precoder
massive MIMO
MIMO
MIMO channel measurements
MU-MIMO
multi-user multiple-input multiple-output systems
Ports (Computers)
Rayleigh channels
singular value spread
spatial separation
sum-rate
sum-rate capacity
ISSN:1550-3607
Online Access:Get full text
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Summary:Fully-synchronous measurements of a massive multi-user multiple-input multiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users located close to each other in line-of-sight (LOS) propagation conditions. The system consists of a base-station (BS) antenna array equipped with 64 dual-polarized antenna elements (128 ports) arranged in a cylindrical configuration, and eight single-antenna users. The users are confined to a five-meter diameter circle and move randomly at pedestrian speeds. The BS antenna array is located on top of a 20 m tall building and has LOS to the users. We examine user separability by studying singular value spread of the MU-MIMO channel matrix for several subsets of BS antenna array ports, along with sum-rate capacity and achievable sum-rates with both zero-forcing and matched-filtering linear precoders. We also analyze the performance of the user with the lowest rate. Finally, a comparison between the performance offered by the massive MIMO system and that of a conventional MU-MIMO system is provided. To the best of our knowledge, this is the first report of fully-synchronous dynamic measurements of a massive MIMO system. Our investigation shows that even users located close to each other in LOS propagation conditions can be spatially separated in a massive MIMO system.
ISSN:1550-3607
DOI:10.1109/ICC.2015.7248526