185 research outputs found
State-of-the-art assessment of 5G mmWave communications
Deliverable D2.1 del proyecto 5GWirelessMain objective of the European 5Gwireless project, which is part of the H2020 Marie Slodowska-
Curie ITN (Innovative Training Networks) program resides in the training and involvement of young
researchers in the elaboration of future mobile communication networks, focusing on innovative
wireless technologies, heterogeneous network architectures, new topologies (including ultra-dense
deployments), and appropriate tools. The present Document D2.1 is the first deliverable of Work-
Package 2 (WP2) that is specifically devoted to the modeling of the millimeter-wave (mmWave)
propagation channels, and development of appropriate mmWave beamforming and signal
processing techniques. Deliver D2.1 gives a state-of-the-art on the mmWave channel measurement,
characterization and modeling; existing antenna array technologies, channel estimation and
precoding algorithms; proposed deployment and networking techniques; some performance
studies; as well as a review on the evaluation and analysis toolsPostprint (published version
Massive MIMO transmission techniques
Next generation of mobile communication systems must support astounding data traffic increases, higher data rates and lower latency, among other requirements. These requirements should be met while assuring energy efficiency for mobile devices and base stations.
Several technologies are being proposed for 5G, but a consensus begins to emerge. Most likely, the future core 5G technologies will include massive MIMO (Multiple Input Multiple Output) and beamforming schemes operating in the millimeter wave spectrum. As soon as the millimeter wave propagation difficulties are overcome, the full potential of massive MIMO structures can be tapped.
The present work proposes a new transmission system with bi-dimensional antenna arrays working at millimeter wave frequencies, where the multiple antenna configurations can be used to obtain very high gain and directive transmission in point to point communications. A combination of beamforming with a constellation shaping scheme is proposed, that enables good user isolation and protection against eavesdropping, while simultaneously assuring power efficient amplification of multi-level constellations
BeamSec: A Practical mmWave Physical Layer Security Scheme Against Strong Adversaries
The high directionality of millimeter-wave (mmWave) communication systems has
proven effective in reducing the attack surface against eavesdropping, thus
improving the physical layer security. However, even with highly directional
beams, the system is still exposed to eavesdropping against adversaries located
within the main lobe. In this paper, we propose \acrshort{BSec}, a solution to
protect the users even from adversaries located in the main lobe. The key
feature of BeamSec are: (i) Operating without the knowledge of eavesdropper's
location/channel; (ii) Robustness against colluding eavesdropping attack and
(iii) Standard compatibility, which we prove using experiments via our IEEE
802.11ad/ay-compatible 60 GHz phased-array testbed. Methodologically, BeamSec
first identifies uncorrelated and diverse beam-pairs between the transmitter
and receiver by analyzing signal characteristics available through
standard-compliant procedures. Next, it encodes the information jointly over
all selected beam-pairs to minimize information leakage. We study two methods
for allocating transmission time among different beams, namely uniform
allocation (no knowledge of the wireless channel) and optimal allocation for
maximization of the secrecy rate (with partial knowledge of the wireless
channel). Our experiments show that \acrshort{BSec} outperforms the benchmark
schemes against single and colluding eavesdroppers and enhances the secrecy
rate by 79.8% over a random paths selection benchmark
A survey on hybrid beamforming techniques in 5G : architecture and system model perspectives
The increasing wireless data traffic demands have driven the need to explore suitable spectrum regions for meeting the projected requirements. In the light of this, millimeter wave (mmWave) communication has received considerable attention from the research community. Typically, in fifth generation (5G) wireless networks, mmWave massive multiple-input multiple-output (MIMO) communications is realized by the hybrid transceivers which combine high dimensional analog phase shifters and power amplifiers with lower-dimensional digital signal processing units. This hybrid beamforming design reduces the cost and power consumption which is aligned with an energy-efficient design vision of 5G. In this paper, we track the progress in hybrid beamforming for massive MIMO communications in the context of system models of the hybrid transceivers' structures, the digital and analog beamforming matrices with the possible antenna configuration scenarios and the hybrid beamforming in heterogeneous wireless networks. We extend the scope of the discussion by including resource management issues in hybrid beamforming. We explore the suitability of hybrid beamforming methods, both, existing and proposed till first quarter of 2017, and identify the exciting future challenges in this domain
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