Abstract
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.
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.
| Original language | English |
|---|---|
| Title of host publication | 2015 IEEE International Conference on Communications (ICC) |
| Publisher | IEEE - Institute of Electrical and Electronics Engineers Inc. |
| Pages | 1441-1446 |
| Publication status | Published - 2015 |
| Event | IEEE International Conference on Communications, ICC 2015 - London, U.K., London, United Kingdom Duration: 2015 Jun 8 → 2015 Jun 12 |
Conference
| Conference | IEEE International Conference on Communications, ICC 2015 |
|---|---|
| Country/Territory | United Kingdom |
| City | London |
| Period | 2015/06/08 → 2015/06/12 |
Subject classification (UKÄ)
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- multi-user multiple-input multiple-output systems
- MU-MIMO
- massive MIMO
- large-scale MIMO
- MIMO channel measurements
- spatial separation
- singular value spread
- sum-rate capacity
- sum-rate
- linear precoder