Beamforming techniques for massive MIMO systems in 5G: overview, classification, and trends for future research

E Ali, M Ismail, R Nordin, NF Abdulah - Frontiers of Information …, 2017 - Springer
Massive multiple-input multiple-output (MIMO) systems combined with beamforming
antenna array technologies are expected to play a key role in next-generation wireless …

Optimal pilot design in massive MIMO systems based on channel estimation

S Ni, J Zhao, Y Gong - IET Communications, 2017 - Wiley Online Library
The performance of multicell massive multiple‐input multiple‐output (MIMO) systems is
heavily affected by pilot contamination. This study considers the problem of pilot …

Low-complexity semiblind channel estimation in massive MU-MIMO systems

CY Wu, WJ Huang, WH Chung - IEEE Transactions on …, 2017 - ieeexplore.ieee.org
Massive multi-user multiple-input multiple-output (MU-MIMO) systems are a promising
solution for achieving high throughput and robust transmission in next generation mobile …

[PDF][PDF] Design of orthogonal uplink pilot sequences for TDD massive MIMO under pilot contamination

S Ali, Z Chen, F Yin - Journal of Communications, 2017 - academia.edu
Massive MIMO has been acknowledged as a promising technology to counter the demand
for higher data capacity for wireless networks in 2020 and beyond. However, each Base …

Partial overlapped time-shifted pilots for massive MIMO systems

W Chang, YK Hua, SF Liao - IEEE Communications Letters, 2017 - ieeexplore.ieee.org
This letter proposes a partial-time-shifted pilot scheme to find a better tradeoff between the
user accommodation and orthogonality of pilots for the massive multiple-input multiple …

Massive MIMO with quasi orthogonal pilots: A flexible solution for TDD systems

HN Qureshi, IH Naqvi, M Uppal - 2017 IEEE 86th Vehicular …, 2017 - ieeexplore.ieee.org
This paper presents novel results for Massive MIMO time division duplex (TDD) system
where the beam-forming vector in the down-link makes use of MMSE channel estimates with …

Iterative interference cancellation based channel estimation for multi-cell massive MIMO systems

X Chen, C Cheng, X Lu, J Gong - 2017 23rd Asia-Pacific …, 2017 - ieeexplore.ieee.org
Massive MIMO technique is expected to greatly improve spectrum efficiency as well as
energy efficiency of a communication system. However, to obtain the benefits, the system …