scholarly journals Power Amplification Efficient Transmitter Structures for Massive MIMO with SC-FDE Schemes: A Promising Combination for 5G Systems?

2018 ◽  
Vol 27 (1) ◽  
pp. 221-233 ◽  
Author(s):  
P. Montezuma ◽  
A. Ferreira ◽  
R. Dinis ◽  
M. Beko
Keyword(s):  
Massive Mimo ◽  
Power Amplification ◽  
5G Systems

Performance analysis of various massive MIMO detection algorithms in 5G Wireless technologies

2019 ◽  
Vol 10 ◽  
Author(s):  
Shihab Jimaa ◽  
Jawahir Al-Ali
Keyword(s):  
Massive Mimo ◽  
Spectrum Efficiency ◽  
System Capacity ◽  
Network Coverage ◽  
Mimo Detection ◽  
Infinity Norm ◽  
Detection Algorithms ◽  
Alternating Direction ◽  
5G Systems ◽  
Efficient Power

Background: The 5G will lead to a great transformation in the mobile telecommunications sector. Objective: The huge challenges being faced by wireless communications such as the increased number of users have given a chance for 5G systems to be developed and considered as an alternative solution. The 5G technology will provide a higher data rate, reduced latency, more efficient power than the previous generations, higher system capacity, and more connected devices. Method: It will offer new different technologies and enhanced versions of the existing ones, as well as new features. 5G systems are going to use massive MIMO (mMIMO), which is a promising technology in the development of these systems. Furthermore, mMIMO will increase the wireless spectrum efficiency and improve the network coverage. Result: In this paper we present a brief survey on 5G and its technologies, discuss the mMIMO technology with its features and advantages, review the mMIMO capacity and energy efficiency and also presents the recent beamforming techniques. Conclusion: Finally, simulation of adopting different mMIMO detection algorithms are presented, which shows the alternating direction method of multipliers (ADMM)-based infinity-norm (ADMIN) detector has the best performance.

scholarly journals Characterisation of Indoor Massive MIMO Channels Using Ray-Tracing: A Case Study in the 3.2–4.0 GHz 5G Band

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1250
Author(s):  
Luis Valle ◽  
Jesús R. Pérez ◽  
Rafael P. Torres
Keyword(s):  
Ray Tracing ◽  
Massive Mimo ◽  
Base Station ◽  
Ofdm System ◽  
Mimo Channels ◽  
5G Systems ◽  
Target Environment ◽  
Temporal Dispersion ◽  
Measurement Campaigns

In this paper, research results on the applicability of ray-tracing (RT) techniques to model massive MIMO (MaMi) channels are presented and discussed. The main goal is to show the possibilities that site-specific models based on rigorous RT techniques, along with measurement campaigns considered for verification or calibration purposes where appropriate, can contribute to the development and deployment of 5G systems and beyond using the MaMi technique. For this purpose, starting from the measurements and verification of the simulator in a symmetric, rectangular and accessible scenario used as the testbed, the analysis of a specific case involving channel characterisation in a large, difficult access and measurement scenario was carried out using the simulation tool. Both the measurement system and the simulations emulated the up-link in an indoor cell in the framework of a MaMi-TDD-OFDM system, considering that the base station was equipped with an array consisting of 10 × 10 antennas. The comparison of the simulations with the measurements in the testbed environment allowed us to affirm that the accuracy of the simulator was high, both for determining the parameters of temporal dispersion and frequency selectivity, and for assessing the expected capacity in a specific environment. The subsequent analysis of the target environment showed the high capacities that a MaMi system can achieve in indoor picocells with a relatively high number of simultaneously active users.

scholarly journals Massive MIMO Systems for 5G Communications

2021 ◽  
Author(s):  
Sinan A. Khwandah ◽  
John P. Cosmas ◽  
Pavlos I. Lazaridis ◽  
Zaharias D. Zaharis ◽  
Ioannis P. Chochliouros
Keyword(s):  
Spectral Efficiency ◽  
Massive Mimo ◽  
Degrees Of Freedom ◽  
Mimo Systems ◽  
Radio System ◽  
Potential System ◽  
5G Systems ◽  
3D Beamforming ◽  
Mimo Technology ◽  
Simultaneous Transmission

AbstractMassive MIMO will improve the performance of future 5G systems in terms of data rate and spectral efficiency, while accommodating a large number of users. Furthermore, it allows for 3D beamforming in order to provide more degrees of freedom and increase the number of high-throughput users. Massive MIMO is expected to provide more advantages compared to other solutions in terms of energy and spectral efficiency. This will be achieved by focusing the radiation towards the direction of the intended users, thus implementing simultaneous transmission to many users while keeping interference low. It can boost the capacity compared to a conventional antenna solution, resulting in a spectral efficiency up to 50 times greater than that provided by actual 4G technology. However, to take full advantage of this technology and to overcome the challenges of implementation in a real environment, a complicated radio system is required. The purpose of this work is to present the MIMO technology evolution and challenges in a simple introductory way and investigate potential system enhancements.

scholarly journals Compression-Based LMMSE Channel Estimation With Adaptive Sparsity for Massive MIMO in 5G Systems

2019 ◽  
Vol 13 (4) ◽  
pp. 3847-3857 ◽  
Author(s):  
Lijun Ge ◽  
Yue Zhang ◽  
Gaojie Chen ◽  
Jun Tong
Keyword(s):  
Channel Estimation ◽  
Massive Mimo ◽  
5G Systems
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