Experimental Trials of 5G Ultra High-Density Distributed Antenna Systems

Kumagai, Shinya; Minowa, Morihiko; Okuyama, Toru; Mashino, Jun; Suyama, Satoshi; Okumura, Yukihiko; Kobayashi, T.; Oyama, Teppei; Chiyoshi, Akiyama; Masafumi, Tsutsui; Jitsukawa, Daisuke; Seyama, Takashi; Dateki, Takashi; Seki, Hiroyuki

doi:10.1109/vtcfall.2019.8891604

Cited by 4 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A great deal of research about cell free massive MIMO including relevant technologies such as coordinated Multi Point (CoMP) and distributed MIMO has been conducted extensively [12], [13]. In addition, some demonstration trials and the product development, which deploys a large number of distributed antennas in a closed area such as an indoor scenario, has been conducted [14]- [16]. On the other hand, in order to deploy this technology to construct a wide service area in reality, there are still technical issues to be solved.…”

Section: Introductionmentioning

confidence: 99%

A Survey on Research Activities for Deploying Cell Free Massive MIMO towards Beyond 5G

Yamazaki

Kishi

Konishi

2022

IEICE Trans. Commun.

View full text Add to dashboard Cite

5G service has been launched in various countries, and research for the beyond 5G is already underway actively around the world. In beyond 5G, it is expected to expand the various capabilities of communication technologies to cover further wide use cases from 5G. As a candidate elemental technology, cell free massive MIMO has been widely researched and shown its potential to enhance the capabilities from various aspects. However, for deploying this technology in reality, there are still many technical issues such as a cost of distributing antenna and installing fronthaul, and also the scalability aspects. This paper surveys research trends of cell free massive MIMO, especially focusing on the deployment challenges with an introduction to our specific related research activities including some numerical examples.

show abstract

Section: Introductionmentioning

confidence: 99%

A Survey on Research Activities for Deploying Cell Free Massive MIMO towards Beyond 5G

Yamazaki

Kishi

Konishi

2022

IEICE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…The main conclusion is that distributed MIMO has a better performance when compared with concentrated MIMO in cases of low mobility (5 km/h) and a similar performance in cases of high mobility (40 km/h). In [22], and using a similar experimental set-up as the one described in [21], a study is presented in the same frequency band, but now in an indoor environment. In this case, a significant increase in throughput is demonstrated when a distributed MIMO configuration is employed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Concentrated versus Distributed Massive MIMO in an Indoor Cell at 3.5 GHz

et al. 2021

View full text Add to dashboard Cite

This paper presents a measurement-based comparison between distributed and concentrated massive multiple-input multiple-output (MIMO) systems, which are called D-mMIMO and C-mMIMO systems, in an indoor environment considering a 400 MHz bandwidth centered at 3.5 GHz. In both cases, we have considered an array of 64 antennas in the base station and eight simultaneously active users. The work focuses on the characterization of both schemes in the up-link, considering the analysis of the sum capacity, the total spectral efficiency (SE) achievable by using the zero forcing (ZF) combining method, as well as the user fairness. The effect of the power imbalance between the different transmitters or user terminal (UT) locations, and thus, the benefits of performing an adequate power control are also investigated. The differences between the C-mMIMO and D-mMIMO channel performances are explained through the observation of the structure of their respective measured channel matrices through parameters such as the condition number or the power imbalance between the channels established by each UT. The channel measurements have been performed in the frequency domain, emulating a massive MIMO system in the framework of a time-domain duplex orthogonal frequency multiple access network (TDD-OFDM-MIMO). The characterization of the MIMO channel is based on the virtual array technique for both C-mMIMO and D-mMIMO systems. The deployment of the C-mMIMO and D-MIMO systems, as well as the distribution of users in the measurement environment, has been arranged as realistically as possible, avoiding the movement of people or machines.

show abstract

28 GHz Distributed-MIMO Comprehensive Antenna Calibration for 5G Indoor Spatial Division Multiplex

Tawa

Kuwabara

Maruta

et al. 2021

2021 IEEE MTT-S International Microwave Symposium (IMS)

View full text Add to dashboard Cite

Experimental Trials of 5G Ultra High-Density Distributed Antenna Systems

Cited by 4 publications

References 5 publications

A Survey on Research Activities for Deploying Cell Free Massive MIMO towards Beyond 5G

A Survey on Research Activities for Deploying Cell Free Massive MIMO towards Beyond 5G

Experimental Analysis of Concentrated versus Distributed Massive MIMO in an Indoor Cell at 3.5 GHz

28 GHz Distributed-MIMO Comprehensive Antenna Calibration for 5G Indoor Spatial Division Multiplex

Contact Info

Product

Resources

About