Beamforming for multiuser massive MIMO systems: Digital versus hybrid analog-digital

Bogale, Tadilo Endeshaw; Le, Long Bao

doi:10.1109/glocom.2014.7037444

Cited by 175 publications

(142 citation statements)

References 17 publications

(28 reference statements)

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“…analog, digital and hybrid BF [26][27]. Hardware for analog BF is much simpler than that of digital BF, which equipped with a lot of RF chains, and ADC/DACs.…”

Section: System Trialsmentioning

confidence: 99%

Real Challenge of Mobile Networks Toward 5G — An Expectation for Antennas & Propagation —

Watanabe

2019

IEICE Trans. Commun.

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“…analog, digital and hybrid BF [26][27]. Hardware for analog BF is much simpler than that of digital BF, which equipped with a lot of RF chains, and ADC/DACs.…”

Section: System Trialsmentioning

confidence: 99%

Real Challenge of Mobile Networks Toward 5G — An Expectation for Antennas & Propagation —

Watanabe

2019

IEICE Trans. Commun.

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“…In fact, mmWave communications require to employ large-scale antennas at both transmitter and receiver sides to provide the sufficient antenna gain to offset the high attention in this frequency regime. Toward this end, development of cost-efficient hardware architecture together with suitably designed channel estimation, beamforming, as well as other communications and signal processing techniques require much further research [77][78][79][80][81][82][83]. The cost-efficient large-scale MIMO architecture where the number of RF chains is smaller than the number of antennas has been considered very potential for mmWave communications [79,80].…”

Section: Ultra-dense Wireless Network Exploiting Microwave and Mmwavmentioning

confidence: 99%

Enabling 5G mobile wireless technologies

Lau

Jorswieck

et al. 2015

J Wireless Com Network

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Research on 5G mobile wireless technologies has been very active in both academia and industry in the past few years. While there has been certain consensus on the overall requirements of 5G wireless systems (e.g., in data rate, network capacity, delay), various enabling wireless technologies have been considered and studied to achieve these performance targets. It has been quite clear, however, that there would be no single enabling technology that can achieve all diverse and even conflicting 5G requirements. In general, many fundamental changes and innovations to re-engineer the overall network architecture and algorithms in different layers and to exploit new system degrees of freedom would be needed for the future 5G wireless system. In particular, we may need to consider other potential waveform candidates that can overcome limitations of the orthogonal frequency multiple access (OFDM) waveform employed in the current 4G system, develop disruptive technologies to fulfill 5G rate and capacity requirements including network densification, employment of large-scale (massive) multiple input multiple output (MIMO), and exploitation of the millimeter wave (mmWave) spectrum to attain Gigabit communications. In addition, design tools from the computer networking domain including software defined networking, virtualization, and cloud computing are expected to play important roles in defining the more flexible, intelligent, and efficient 5G network architecture. This paper aims at describing key 5G enabling wireless mobile technologies and discussing their potentials and open research challenges. We also present how papers published in our special issue contribute to the developments of these disruptive 5G technologies.

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“…As a consequence, data streams have to be mapped to the individual antenna elements at the RUs. While for sub-6 GHz systems, this mapping can be performed in the digital domain using precoders, for mmWave, the performance and power consumption of ADC/DAC chains encourages a partially analog approach, using a so-called hybrid beamforming architecture [17].…”

Section: Large Antenna Arraysmentioning

confidence: 99%

5G transport network requirements for the next generation fronthaul interface

Bartelt

Vučić

Camps‐Mur

et al. 2017

J Wireless Com Network

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To meet the requirements of 5G mobile networks, several radio access technologies, such as millimeter wave communications and massive MIMO, are being proposed. In addition, cloud radio access network (C-RAN) architectures are considered instrumental to fully exploit the capabilities of future 5G RANs. However, RAN centralization imposes stringent requirements on the transport network, which today are addressed with purpose-specific and expensive fronthaul links. As the demands on future access networks rise, so will the challenges in the fronthaul and backhaul segments. It is hence of fundamental importance to consider the design of transport networks alongside the definition of future access technologies to avoid the transport becoming a bottleneck. Therefore, we analyze in this work the impact that future RAN technologies will have on the transport network and on the design of the next generation fronthaul interface. To understand the especially important impact of varying user traffic, we utilize measurements from a real-world 4G network and, taking target 5G performance figures into account, extrapolate its statistics to a 5G scenario. With this, we derive both per-cell and aggregated data rate requirements for 5G transport networks. In addition, we show that the effect of statistical multiplexing is an important factor to reduce transport network capacity requirements and costs. Based on our investigations, we provide guidelines for the development of the 5G transport network architecture.

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Beamforming for multiuser massive MIMO systems: Digital versus hybrid analog-digital

Cited by 175 publications

References 17 publications

Real Challenge of Mobile Networks Toward 5G — An Expectation for Antennas & Propagation —

Real Challenge of Mobile Networks Toward 5G — An Expectation for Antennas & Propagation —

Enabling 5G mobile wireless technologies

5G transport network requirements for the next generation fronthaul interface

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