Anass Benjebbour’s research while affiliated with NTT DOCOMO and other places

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Publications (83)

Outdoor Experiments on Long-Range and Mobile Communications Using 39-GHz Band for 5G and Beyond
  • Article

February 2019

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45 Reads

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4 Citations

IEICE Transactions on Communications

Masashi Iwabuchi

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Anass Benjebbour

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Terufumi Takada

This paper presents results of outdoor experiments conducted in the 39-GHz band. In particular, assuming mobile communications such as the fifth generation mobile communications (5G) and beyond, we focus on achieving 1 Gbit/s or greater throughput at transmission distances exceeding 1 km in the experiments. In order to enhance the data rate and capacity, the use of higher frequency bands above 6 GHz for mobile communications is a new and important technical challenge for 5G and beyond. To extend further the benefits of higher frequency bands to various scenarios, it is important to enable higher frequency bands to basically match the coverage levels of existing low frequency bands. Moreover, mobility is important in mobile communications. Therefore, we assume the 39-GHz band as a candidate frequency for 5G and beyond and prepare experimental equipment that utilizes lens antenna and beam tracking technologies. In the experiments, we achieve the throughput values of 2.14 Gbit/s at the transmission distance of 1850 m and 1.58 Gbit/s at 20-km/h mobility. Furthermore, we show the possibility of achieving high throughput even under non-line-of-sight conditions. These experimental results contribute to clarifying the potential for the 39-GHz band to support gigabit-per-second class data rates while still providing coverage and supporting mobility over a coverage area with distance greater than 1 km.

Experimental Trials on Non-Orthogonal Multiple Access

January 2019

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89 Reads

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7 Citations

Anass Benjebbour

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Keisuke Saito

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Non-orthogonal multiple access (NOMA) is a novel multi-user multiplexing scheme, which overlaps the radio resources of multiple users in an non-orthogonal manner in order to improve spectral efficiency. NOMA is able to contribute to the improvement of the trade-off between system capacity and user fairness by assigning different power ratios to the multiplexed users depending on their relative channel quality. In this chapter, we focus on downlink NOMA and its combination with open-loop SU-MIMO and assess its performance under realistic conditions. In particular, we introduce the results of the experimental trials we conducted in both indoor and outdoor environments using two users served by 2 ×\times 2 open-loop single-user (SU)-MIMO.

5G Experimental Trials for Ultra-Reliable and Low Latency Communications Using New Frame Structure

August 2018

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56 Reads

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7 Citations

IEICE Transactions on Communications

Masashi Iwabuchi

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Anass Benjebbour

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Terufumi Takada

The fifth generation mobile communications (5G) systems will need to support the ultra-reliable and low-latency communications (URLLC) to enable future mission-critical applications, e.g., self-driving cars and remote control. With the aim of verifying the feasibility of URLLC related 5G requirements in real environments, field trials of URLLC using a new frame structure are conducted in Yokohama, Japan. In this paper, we present the trial results and investigate the impact of the new frame structure and retransmission method on the URLLC performance. To reduce the userplane latency and improve the packet success probability, a wider subcarrier spacing, self-contained frame structure, and acknowledgement/negative acknowledgement-less (ACK/NACK-less) retransmission are adopted. We verify the feasibility of URLLC in actual field tests using our prototype test-bed while implementing these techniques. The results show that for the packet size of 32 bytes the URLLC related requirements defined by the 3GPP are satisfied even at low signal-to-noise ratios or at non-line-of-sight transmission.

Citations (71)

... Therefore, some issues remain regarding the use of these bands. The typical examples are smaller coverage areas caused by significant pathloss and multiple-input-multiple-output (MIMO) stream reduction due to less scattering [5]. ...

Reference:

User-Driven Relay Beamforming for mmWave Massive Analog-Relay MIMO
Outdoor Experiments on Long-Range and Mobile Communications Using 39-GHz Band for 5G and Beyond
  • Citing Article

  • February 2019

IEICE Transactions on Communications

Masashi Iwabuchi

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Anass Benjebbour

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[...]

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Terufumi Takada

... They use an optimization algorithm that calculates the minimum mean square error with the least standard deviation to form the best fit. Ref [57][58][59]63] proposed a ray tracing simulation technique to model path loss at 28 GHz. Kamboh, et al. [64] carried out a 3D ray-tracing at 60 GHz mm-Wave using a simulation model developed in MATLAB. ...

Reference:

Deterministic 5G mmWave Large-Scale 3D Path Loss Model for Lagos Island, Nigeria
5G System Evaluation Tool
  • Citing Conference Paper

  • August 2018

Koshiro Kitao

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Anass Benjebbour

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Tetsuro Imai

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Yukihiko Okumura

... Current research directions investigate the combination of innovative technologies such as NOMA and massive MIMO, which are crucial to increasing spectral efficiency. For example, Benjebbour et al. and Alberto et al. outlined, in [1] and [2], the potential of combining NOMA and MIMO, highlighting their crucial roles in addressing exponential growth in traffic and the number of connected devices. ...

Reference:

Efficient Resource Allocation in 5G Massive MIMO-NOMA Networks: Comparative Analysis of SINR-Aware Power Allocation and Spatial Correlation-Based Clustering
Combination of NOMA and MIMO: Concept and Experimental Trials
  • Citing Conference Paper

  • June 2018

Anass Benjebbour

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... NOMA scheme uses non-orthogonal resource allocation that allows controllable interference with the adequate increase in receiver complexity. NOMA authorizes various users to employ frequency and time resources (Benjebbour et al., 2019). NOMA is a multiple-user access scheme different from current OMA schemes. ...

Reference:

NOMA and future 5G & B5G wireless networks: A paradigm
Experimental Trials on Non-Orthogonal Multiple Access
  • Citing Chapter

  • January 2019

Anass Benjebbour

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Keisuke Saito

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... The end-to-end latency estimation for spacecraft automation and sensor based communication was found 5 ms in a TDMA protocol [30]. 5G URLLC has been investigated in [31] for real-time application, which is a newer frame structure, well beyond the LTE-advanced frame that can use URLLC latency. This seems to have a reliability requirement for different packet sizes evaluated in a different modulation technique. ...

Reference:

Cluster-Based Transmission Diversity Optimization in Ultra Reliable Low Latency Communication
5G Experimental Trials for Ultra-Reliable and Low Latency Communications Using New Frame Structure
  • Citing Article

  • August 2018

IEICE Transactions on Communications

Masashi Iwabuchi

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Anass Benjebbour

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[...]

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Terufumi Takada

... In contrast to the extensive theoretical analysis, there exist only a handful of actual trialing efforts using 5G connectivity to support the functions and operation of automated vehicles in general (e.g., [10], [11]) and especially of remote driving applications (e.g., [12]- [14]). Specifically, the works [10] and [11] consider basic functions of automated driving and evaluate the achieved coverage, mobility, latency, and packet loss, respectively, after experimentation and trialing in real 5G sites. ...

Reference:

Teleoperated Support for Remote Driving over 5G Mobile Communications
Evaluation of Coverage and Mobility for URLLC via Outdoor Experimental Trials
  • Citing Conference Paper

  • June 2018

Masashi Iwabuchi

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Anass Benjebbour

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Yang Cui

... Channel estimation using training is covered in III Section, IV section of the paper provides channel estimation using DFT, Simulation results covered in V section, and VI section brings the conclusion of the paper. Fig. 1 shows the Multi-Carrier system, the employment of spatial diversity or spatial multiplexing techniques is made possible by using several transmitters at the transmitting and reception [14,15]. ...

Reference:

An Evaluation of Channel Estimation Methods for MIMO-OFDM System
Field Trials on Spectral Efficiency Improvement in Massive MIMO Systems
  • Citing Conference Paper

  • June 2018

Jian Wang

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Aixiang Jin

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Dai Shi

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Anass Benjebbour

... As such, all users except the one with the weakest channel gain will need to apply SIC for decoding. Although SIC has been implemented in smartphone size devices [260], it is too complex for simple IoT devices. As a result, although some papers propose downlink NOMA for IoT users [261][262][263][264][265], due to the SIC complexity, practically it is hard to justify more than one IoT device in each group of NOMA. ...

Reference:

Cellular, Wide-Area, and Non-Terrestrial IoT: A Survey on 5G Advances and the Road Towards 6G
Outdoor Experimental Trials of Advanced Downlink NOMA Using Smartphone-Sized Devices
  • Citing Conference Paper

  • June 2018

Anass Benjebbour

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Yukihiko Okumura

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I-Kang Fu

... Next-generation networks will utilize millimeter-wave (mmWave) frequencies, which are abundant and can deliver ultra-high throughput. Experimental trials have demonstrated that mmWave can perform long-range communications in line-of-sight (LoS) scenarios [8]. The mmWave is expected to play a vital role and become essential in 6G, along with new spectrum bands such as terahertz (THz) and free space optics (FSO). ...

Reference:

Customized Millimeter Wave Channel Model for Enhancement of Next-Generation UAV-Aided Internet of Things Networks
Outdoor Experimental Trials of Long Range Mobile Communications Using 39 GHz
  • Citing Conference Paper

  • June 2018

Anass Benjebbour

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Masashi Iwabuchi

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Terufumi Takada

... In addition, in order to improve system performances towards 5GE, BS has to communicate with several MSs by suppressing interference among the MSs with digital precoding at a baseband unit (BBU). Although initial 5G services around 2020 employ the analog BF in the mmW bands, hybrid BF [3], [9] and fully digital BF [10], [11] will be introduced to 5GE, because these BF schemes can adopt the digital precoding. When we consider the BS cooperation technologies with digital precoding to improve system performances, joint transmission using two BSs has been proposed [12]. ...

Reference:

Base Station Cooperation Technologies Using 28 GHz-Band Digital Beamforming in High-Mobility Environments
Ultra-high-throughput massive MIMO field-trial over radio computing architecture with peak spectrum efficiency of 79.82 bps/Hz
  • Citing Conference Paper
  • Full-text available

  • October 2017

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Yuanquan Wang

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Bojie Li

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