scholarly journals Millimetre wave 3-D channel modelling for next generation 5G networks

2022 ◽  
Vol 6 (1) ◽  
pp. 29-42
Author(s):  
Latih Saba'neh ◽  
◽  
Obada Al-Khatib ◽  
Keyword(s):  
Channel Model ◽  
Mimo System ◽  
Wave Spectrum ◽  
Mimo Channel ◽  
Propagation Path ◽  
Line Of Sight ◽  
Atmospheric Effects ◽  
New York University ◽  
Millimetre Wave ◽  
Wave Channel

<abstract><p>Millimetre wave (mm-wave) spectrum (30-300GHz) is a key enabling technology in the advent of 5G. However, an accurate model for the mm-wave channel is yet to be developed as the existing 4G-LTE channel models (frequency below 6 GHz) exhibit different propagation attributes. In this paper, a spatial statistical channel model (SSCM) is considered that estimates the characteristics of the channel in the 28, 60, and 73 GHz bands. The SSCM is used to mathematically approximate the propagation path loss in different environments, namely, Urban-Macro, Urban-Micro, and Rural-Macro, under Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) conditions. The New York University (NYU) channel simulator is utilised to evaluate the channel model under various conditions including atmospheric effects, distance, and frequency. Moreover, a MIMO system has been evaluated under mm-wave propagation. The main results show that the 60 GHz band has the highest attenuation compared to the 28 and 73 GHz bands. The results also show that increasing the number of antennas is proportional to the condition number and the rank of the MIMO channel matrix.</p></abstract>

scholarly journals Three-Dimensional MIMO Channel Model with High-Mobility Wireless Communication Systems Using Leaky Coaxial Cable in Rectangular Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Kai Zhang ◽  
Fangqi Zhang ◽  
Guoxin Zheng ◽  
Lei Cang
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Channel Model ◽  
Mimo System ◽  
Three Dimensional ◽  
High Mobility ◽  
Coaxial Cable ◽  
Mimo Channel ◽  
Wireless Communication Systems ◽  
Rectangular Tunnel

With the rapid development of high-mobility wireless communication systems, e.g., high-speed train (HST) and metro wireless communication systems, more and more attention has been paid to the wireless communication technology in tunnel-like scenarios. In this paper, we propose a three-dimensional (3D) nonstationary multiple-input multiple-output (MIMO) channel model with high-mobility wireless communication systems using leaky coaxial cable (LCX) inside a rectangular tunnel over the 1.8 GHz band. Taking into account single-bounce scattering under line-of-sight (LoS) and non-line-of-sight (NLoS) propagations condition, the analytical expressions of the channel impulse response (CIR) and temporal correlation function (T-CF) are derived. In the proposed channel model, it is assumed that a large number of scatterers are randomly distributed on the sidewall of the tunnel and the roof of the tunnel. We analyze the impact of various model parameters, including LCX spacing, time separation, movement velocity of Rx, and K-factor, on the T-CF of the MIMO channel model. For HST, the results of some further studies on the maximum speed of 360 km/h are given. By comparing the T-CF between the dipole MIMO system and the LCX-MIMO system, we can see that the performance of the LCX-MIMO system is better than that of the dipole MIMO system.

Scattered Propagation MIMO Channel Model for Non-Line-of-Sight Ultraviolet Optical Transmission

2017 ◽  
Vol 29 (21) ◽  
pp. 1907-1910 ◽  
Author(s):  
Heng Qin ◽  
Yong Zuo ◽  
Feiyu Li ◽  
Risheng Cong ◽  
Lingchao Meng ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Channel Model ◽  
Mimo Channel ◽  
Line Of Sight ◽  
Non Line Of Sight

scholarly journals A non-stationary relay-based 3D MIMO channel model with time-variant path gains for human activity recognition in indoor environments

2021 ◽  
Author(s):  
Rym Hicheri ◽  
Ahmed Abdelgawwad ◽  
Mathias Pätzold
Keyword(s):  
Doppler Shift ◽  
Channel Model ◽  
Mimo System ◽  
The Body ◽  
Mimo Channel ◽  
Indoor Environments ◽  
Indoor Space ◽  
Received Power ◽  
Rf Signal ◽  
The Impact

AbstractExtensive research showed that the physiological response of human tissue to exposure to low-frequency electromagnetic fields is the induction of an electric current in the body segments. As a result, each segment of the human body behaves as a relay, which retransmits the radio-frequency (RF) signal. To investigate the impact of this phenomenon on the Doppler characteristics of the received RF signal, we introduce a new three-dimensional (3D) non-stationary channel model to describe the propagation phenomenon taking place in an indoor environment. Here, the indoor space is equipped with a multiple-input multiple-output (MIMO) system. A single person is moving in the indoor space and is modelled by a cluster of synchronized moving point scatterers, which behave as relays. We derive the time-variant (TV) channel transfer function (CTF) with TV path gains and TV path delays. The expression of the TV path gains is obtained from the instantaneous total received power at the receiver side. This TV total received power is expressed as the product of the TV power of the RF signal initially transmitted and received by a body segment and the TV received power of the redirected signal. These TV powers are determined according the free-space path-loss model. Also, a closed-form approximate solution to the spectrogram of the TVCTF is derived. Here, we analyse the effect of the motion of the person and the validity of the relay assumption on the spectrogram, the TV mean Doppler shift (MDS), and the TV Doppler shift (DS) of the TVCTF. Simulation results are presented to illustrate the proposed channel model.

scholarly journals IRS-Assisted UAV Communications with Imperfect Phase Compensation

2020 ◽  
Author(s):  
Arafat Al-Dweik ◽  
MOHAMMAD AHMAD Al-Jarrah ◽  
Emad Alsusa ◽  
Mohamed-Slim Alouini ◽  
Youssef Iraqi
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Channel Model ◽  
Phase Error ◽  
Propagation Path ◽  
Line Of Sight ◽  
Rician Fading ◽  
Phase Compensation ◽  
Communications Systems ◽  
Von Mises ◽  
Reflecting Surfaces

<div>This work presents a performance analysis on unmanned aerial vehicles (UAVs) assisted wireless</div><div>communications systems, where one of the UAVs supports intelligent reflecting surfaces (IRS). As the</div><div>estimation and compensation of the end-to-end phase for each propagation path is prone to errors, imperfect</div><div>phase compensation at the IRS is taken into consideration. The performance is derived in terms of symbol</div><div>error rate (SER) and outage probability, where the phase error is modeled using the von Mises distribution.</div><div>The air-to-air (A2A) channel for</div><div>each propagation path is modeled as a single dominant line-of-sight (LoS) component, and the results are</div><div>compared to the Rician channel model. The obtained results reveal that the considered A2A model can be</div><div>used to accurately represent the A2A channel with Rician fading.</div>

scholarly journals IRS-Assisted UAV Communications with Imperfect Phase Compensation

2020 ◽  
Author(s):  
Arafat Al-Dweik ◽  
MOHAMMAD AHMAD Al-Jarrah ◽  
Emad Alsusa ◽  
Mohamed-Slim Alouini ◽  
Youssef Iraqi
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Channel Model ◽  
Phase Error ◽  
Propagation Path ◽  
Line Of Sight ◽  
Rician Fading ◽  
Phase Compensation ◽  
Communications Systems ◽  
Von Mises ◽  
Reflecting Surfaces

<div>This work presents a performance analysis on unmanned aerial vehicles (UAVs) assisted wireless</div><div>communications systems, where one of the UAVs supports intelligent reflecting surfaces (IRS). As the</div><div>estimation and compensation of the end-to-end phase for each propagation path is prone to errors, imperfect</div><div>phase compensation at the IRS is taken into consideration. The performance is derived in terms of symbol</div><div>error rate (SER) and outage probability, where the phase error is modeled using the von Mises distribution.</div><div>The air-to-air (A2A) channel for</div><div>each propagation path is modeled as a single dominant line-of-sight (LoS) component, and the results are</div><div>compared to the Rician channel model. The obtained results reveal that the considered A2A model can be</div><div>used to accurately represent the A2A channel with Rician fading.</div>

scholarly journals User Effects on MIMO Performance: From an Antenna to a Link Perspective

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Shirook M. Ali ◽  
Amin Mobasher ◽  
Paul Lusina
Keyword(s):  
Channel Capacity ◽  
Channel Model ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Average Power ◽  
Cumulative Distribution ◽  
Mimo Channel ◽  
Power Transfer ◽  
Error Performance ◽  
Mimo Antenna

We investigate in this paper the effects of the user's presence on the performance of a multiple-input multiple-output (MIMO) system in data and in voice usage scenarios. The investigation studies the user effects on the antenna performance and how these are incorporated into the MIMO channel and the link characteristics. The antennas and the user are deterministic. These are then integrated into the statistical 3GPP spatial channel model (SCM) for a typical macrocell propagation environment setting. The channel performance is analyzed based on the average channel capacity, the average power transfer, the correlation, and the cumulative distribution function of the channel capacity as well as the link throughout and the error performance. The mentioned channel and link properties are tied to the MIMO antenna properties that are represented in the mutual coupling between the antennas, the power loss, the total radiated power, the mean effective gain (MEG), as well as the efficiency with emphasis on how the user affects each. It was found that the presence of the user contributed to a loss of up to 50% in the average channel power transfer. The data position was found to be the lowest in terms of channel capacity performance. The voice position performance showed a large dependence on the user orientation with respect to the line of sight path while the data position showed less dependence on the user's orientation. We also discuss through the examined antenna and channel properties the importance of the channel multipath on the MIMO performance. In some scenarios, it was found that a well-conditioned channel can compensate for losses due to the presence of the user, improving the overall system performance. The presented investigation at the link level also discusses the user effects in different MIMO transmission schemes.

scholarly journals Field-Theoretical Investigations of the Influence of Mutual Coupling Effects on the Capacity of MIMO Wireless Links

2005 ◽  
Vol 3 ◽  
pp. 437-440
Author(s):  
H. Ndoumbè Mbonjo Mbonjo ◽  
G. Wu ◽  
V. Hansen
Keyword(s):  
Patch Antenna ◽  
Mutual Coupling ◽  
Channel Model ◽  
Mimo System ◽  
Dipole Antenna ◽  
Antenna System ◽  
Mimo Channel ◽  
Coupling Effects ◽  
Mimo Channels ◽  
Half Wavelength

Abstract. We present a MIMO channel model which takes into account mutual coupling effects at the receiver and transmitter array in order to assess the influence of mutual coupling effects on the capacity of MIMO channels. We evaluate the mutual impedances using a general approach based on the electric field integral equation (EFIE) and its implementation by the method of moments (MOM). We compute the capacity of a 2x2-MIMO system in a one path scenario for square half wavelength patch antenna elements and half wavelength dipole antenna elements. The capacity of the MIMO system with and without coupling increases compared to the single antenna transmission for the patch antenna elements. On the contrary for half wavelength dipole antenna elements we have found that the MIMO system degenerates to a one-transmitting, one-receiving antenna system due to mutual coupling.

Millimetre-wave spectrum of the Ar-CO complex: the K = 2 ← 1 and 3 ← 2 subbands

1997 ◽  
Vol 92 (2) ◽  
pp. 229-236 ◽  
Author(s):  
M. HEPP ◽  
R. GENDRIESCH ◽  
I. PAK ◽  
Y.A. KURITSYN ◽  
F. LEWEN ◽  
...  
Keyword(s):  
Wave Spectrum ◽  
Millimetre Wave

MIMO Systems in a Composite Fading and Generalized Noise Scenario: A Review

2020 ◽  
Vol 14 ◽  
Author(s):  
Keerti Tiwari
Keyword(s):  
System Performance ◽  
Performance Enhancement ◽  
Channel Model ◽  
Mimo Systems ◽  
Mimo System ◽  
Spatial Diversity ◽  
Spatial Multiplexing ◽  
Channel Models ◽  
Efficient System ◽  
Composite Channel

: Multiple-input multiple-output (MIMO) systems have been endorsed to enable future wireless communication requirements. The efficient system designing appeals an appropriate channel model, that considers all the dominating effects of wireless environment. Therefore, some complex or less analytically acquiescent composite channel models have been proposed typically for single-input single-output (SISO) systems. These models are explicitly employed for mobile applications, though, we need a specific study of a model for MIMO system which can deal with radar clutters and different indoor/outdoor and mobile communication environments. Subsequently, the performance enhancement of MIMO system is also required in such scenario. The system performance enhancement can be examined by low error rate and high capacity using spatial diversity and spatial multiplexing respectively. Furthermore, for a more feasible and practical system modeling, we require a generalized noise model along with a composite channel model. Thus, all the patents related to MIMO channel models are revised to achieve the near optimal system performance in real world scenario. This review paper offers the methods to improve MIMO system performance in less and severe fading as well as shadowing environment and focused on a composite Weibull-gamma fading model. The development is the collective effects of selecting the appropriate channel models, spatial multiplexing/detection and spatial diversity techniques both at the transmitter and the receivers in the presence of arbitrary noise.

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