Antenna Deployment of 5G Ultra High-Density Distributed Massive MIMO by Low-SHF-Band Indoor and Outdoor Experiments

Okuyama, Toru; Suyama, Satoshi; Mashino, Jun; Okumura, Yukihiko; Shiizaki, Kotaro; Chiyoshi, Akiyama; Masafumi, Tsutsui; Seki, Hiroyuki; Minowa, Morihiko

doi:10.1109/vtcfall.2017.8288005

Cited by 9 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to localized Massive MIMO (abovementioned typical Massive MIMO), distributed Massive MIMO technology is being studied by the low-SHF-band experimental trial in collaboration with Fujitsu [24]- [26]. Performance comparison between the localized Massive MIMO and the distributed Massive MIMO were made [25], [26], and the distributed Massive MIMO can achieve higher area spectral efficiency than the distributed Massive MIMO.…”

Section: Overview Of Recent 5g Experimental Trialsmentioning

confidence: 99%

“…For example, in the low SHF bands, Massive MIMO can employ a fully digital architecture using a digital BF algorithm. This is because the signal bandwidth of 100-200 MHz is narrower than that of several hundred MHz in the high SHF bands or 1-2 GHz in the EHF bands and the number of antenna elements such as almost 100 antenna elements is smaller than several hundred antenna elements in the high SHF and EHF bands [8]- [26]. On the other hand, in the high SHF and EHF bands, analog BF algorithms or hybrid BF algorithms, which are combined analog BF with digital precoding, have been studied due to implementation issues [27]- [42].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

Okumura

Suyama

Mashino

et al. 2019

IEICE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

In order to cope with recent growth of mobile data traffic and emerging various services, world-wide system trials for the fifthgeneration (5G) mobile communication system that dramatically extends capability of the fourth-generation mobile communication system are being performed to launch its commercial service in 2020. In addition, research and development of new radio access technologies for 5G evolution and beyond 5G systems are beginning to be made all over the world. This paper introduces our recent activities on 5G transmission experiments that aim to validate Massive MIMO technologies using higher frequency bands such as SHF/EHF bands, that is, 5G experimental trials. Recent results of 5G system trials to create new services and applications in 5G era in cooperation with partners in vertical industries are also introduced.

show abstract

Section: Overview Of Recent 5g Experimental Trialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

Okumura

Suyama

Mashino

et al. 2019

IEICE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this case, the work is more focused on the proposal of new user scheduling algorithms than on the comparison of distributed versus collocated antenna configurations. In [21], an outdoor field experiment at 4.65 GHz of a distributed MIMO system is presented using sub-arrays of 2 × 2 antennas that are deployed on the terrace of a building in four positions 37 m apart. The total throughput is compared to that obtained with a concentrated MIMO system of 4 × 4 antennas.…”

Section: Introductionmentioning

confidence: 99%

“…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

“…Although there are many publications on the field trials in the low super-high-frequency (SHF) band, which is the potential candidate frequency band for early commercial services of 5G, [2], [3] focused on the high rank MIMO of a single user equipment (UE), and [4] addressed the throughput performance with fixed TRXs at BS. Some studies, such as [5] and [6], have been made on the performance of coherent joint transmission (JT). In the coherent JT, the antennas used in the beamforming are not colocated but correspond to the locations of APs, and data is transmitted from these noncolocated antennas.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Downlink Multi-User Massive MIMO with Configurable Active Antenna System and Inter Access Point Coordination in Low-SHF-Band

Jiang¹,

Yamazaki²,

Hayata³

et al. 2019

IEICE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

Massive multiple input and multiple output (Massive MIMO) is a key technique to achieve high system capacity and user data rate for the fifth generation (5G) radio access network (RAN). To implement Massive MIMO in 5G, how much Massive MIMO meets our expectation with various user equipment (UEs) in different environments should be carefully addressed. We focused on using Massive MIMO in the low super-high-frequency (SHF) band, which is expected to be used for 5G commercial bands relatively soon. We previously developed a prototype low-SHF-band centralized-RAN Massive MIMO system that has a flexible active antenna system (AAS)-unit configuration and facilitates advanced radio coordination features, such as coordinated beamforming (CB) coordinated multi-point (CoMP). In this study, we conduct field trials to evaluate downlink (DL) multiuser (MU)-MIMO performance by using our prototype system in outdoor and indoor environments. The results indicate that about 96% of the maximum total DL system throughput can be achieved with 1 AAS unit outdoors and 2 AAS units indoors. We also investigate channel capacity based on the real propagation channel estimation data measured by the prototype system. Compared with without-CB mode, the channel capacity of with-CB mode increases by a maximum of 80% and 104%, respectively, when the location of UEs are randomly selected in the outdoor and indoor environments. Furthermore, the results from the field trial of with-CB mode with eight UEs indicate that the total DL system throughput and user data rate can be significantly improved.

show abstract

Antenna Deployment of 5G Ultra High-Density Distributed Massive MIMO by Low-SHF-Band Indoor and Outdoor Experiments

Cited by 9 publications

References 10 publications

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

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

Performance Evaluation of Downlink Multi-User Massive MIMO with Configurable Active Antenna System and Inter Access Point Coordination in Low-SHF-Band

Contact Info

Product

Resources

About