Fractal Antenna Systems with Chiral Metamaterials Substrates for MIMO Systems

2022 ◽  
pp. 329-345
Author(s):  
Veronika S. Beliaeva ◽  
Dmitriy S. Klyuev ◽  
Anatoly M. Neshcheret ◽  
Alexander A. Potapov ◽  
Yulia V. Sokolova
Keyword(s):  
Mimo Systems ◽  
Fractal Antenna ◽  
Chiral Metamaterials ◽  
Antenna Systems

Repetition Coding and Equal Power Allocation Scheme for JPEG Image Transmission over MIMO Systems

2016 ◽  
Vol 8 (3) ◽  
pp. 10-19
Author(s):  
Mujeeb Ahmed
Keyword(s):  
Power Allocation ◽  
Mimo Systems ◽  
Spatial Multiplexing ◽  
Quality Data ◽  
Smart Devices ◽  
Allocation Scheme ◽  
Repetition Coding ◽  
Equal Power Allocation ◽  
Equal Power ◽  
Antenna Systems

Multiple transmit and receive antenna systems have improved the reliability as well as data rate in a wireless communication system. Such advanced wireless architectures have empowered smart devices to fulfill the demand of multimedia content. Image is a major user generated content in wide range of applications, hence reliable transmission of image is an important research problem. New transmission and coding schemes that explore advantages of multiple antenna systems matched with source statistics have been developed. Based on a similar idea, an equal power allocation scheme for transmission of compressed images over multiple-input multiple-output (MIMO) systems employing partial repetition coding is proposed. The JPEG compression algorithm divides image into different quality layers. The proposed system repeats transmission of high quality data from more than one antenna as compared to the lower quality data which is transmitted using one antenna at most, in a particular time slot. A heuristic spatial multiplexing scheme is also proposed to optimally divide the bit stream chunks for transmission. Extensive simulations have shown that equal power allocation and repetition coding scheme is better as compared to reference schemes.

scholarly journals Practical and Simple Wireless Channel Models for Use in Multipolarized Antenna Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
KwangHyun Jeon ◽  
Xin Su ◽  
Bing Hui ◽  
KyungHi Chang
Keyword(s):  
Channel Model ◽  
Mimo Systems ◽  
Wireless Channel ◽  
Spatial Multiplexing ◽  
Channel Models ◽  
Data Rates ◽  
Outdoor Environments ◽  
Wireless Channel Models ◽  
2D And 3D ◽  
Antenna Systems

The next-generation wireless systems are expected to support data rates of more than 100 Mbps in outdoor environments. In order to support such large payloads, a polarized antenna may be employed as one of the candidate technologies. Recently, the third generation partnership standards bodies (3GPP/3GPP2) have defined a cross-polarized channel model in SCM-E for MIMO systems; however, this model is quite complex since it considers a great many channel-related parameters. Furthermore, the SCM-E channel model combines the channel coefficients of all the polarization links into one complex output, making it impossible to exploit the MIMO spatial multiplexing or diversity gains in the case of employing polarized antenna at transmitter and receiver side. In this paper, we present practical and simple 2D and 3D multipolarized multipath channel models, which take into account both the cross-polarization discrimination (XPD) and the Rician factor. After verifying the proposed channel models, the BER and PER performances and throughput using the EGC and MRC combining techniques are evaluated in multipolarized antenna systems.

Microstrip and Fractal Antennas Based on Chiral Metamaterials in MIMO Systems

2020 ◽  
pp. 295-306
Author(s):  
Dmitriy S. Klyuev ◽  
Anatoly M. Neshcheret ◽  
Oleg V. Osipov ◽  
Alexander A. Potapov ◽  
Julia V. Sokolova
Keyword(s):  
Mimo Systems ◽  
Chiral Metamaterials ◽  
Fractal Antennas

Compact 2x2 and 4x4 MIMO Antenna Systems for 5G Automotive Applications

2021 ◽  
Vol 36 (6) ◽  
pp. 762-778
Author(s):  
Mohamed Khalifa ◽  
Ahmad Yacoub ◽  
Daniel Aloi
Keyword(s):  
Mimo Systems ◽  
Ground Plane ◽  
Multiple Input Multiple Output ◽  
Compact Structure ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Passive Isolation ◽  
The Individual ◽  
Antenna Systems

In this paper, three Vehicular multiple-input multiple-output (MIMO) 5G antenna systems have been constructed from using a newly developed 5G cellular branched Monopole element are presented. The MIMO systems operates in the 5G frequency bands (617MHz- 5GHz) with a compact structure that allows for up to four elements to be integrated in the same Sharkfin. The 3 configurations of MIMO systems have been simulated using HFSS, measured on a 1-meter ground plane (GND), then measured on a vehicle roof and the individual antenna parameters in terms of reflection coefficient and efficiency have captured. The MIMO antenna systems performance in terms of passive isolation, combined radiation pattern, envelope correlation coefficient (ECC), and diversity gain (DG) have been reported and discussed.

scholarly journals Research of antenna complexes using chiral metamaterials and fractal geometry of radiators for MIMO systems

2021 ◽  
Vol 23 (4) ◽  
pp. 97-110
Author(s):  
Andrey N. Bespalov ◽  
Alexander L. Buzov ◽  
Dmitry S. Klyuev ◽  
Anatoly M. Neshcheret
Keyword(s):  
Spectral Efficiency ◽  
Fractal Geometry ◽  
Software Package ◽  
Mimo Systems ◽  
Mutual Influence ◽  
Fractal Structures ◽  
Chiral Metamaterials ◽  
Sierpinski Triangle ◽  
Electrodynamic Modeling ◽  
Complete Matrix

This article is devoted to the study of the possibilities of increasing spectral efficiency in MIMO systems by using antennas with substrates of biisotropic and bianisotropic chiral metamaterials and various types of fractal emitters, in particular, fractal structures in the form of a Sierpinski triangle, Koch and Gilbert curves, as well as a dipole triangular antenna of complex configuration FRM. The spectral efficiency was calculated by using one of the variations of the Shannon formula, which includes a complete matrix of Z-parameters. In turn, this matrix was determined using the software package of electrodynamic modeling. It is shown that the use of such antennas with the fractal geometry of the emitters located on chiral substrates reduces the mutual influence between the emitters, and, in turn, increases the spectral efficiency in several frequency ranges compared to traditional solutions.

scholarly journals Performance Analysis of Multiple Antenna Systems with New Capacity Improvement Algorithm for MIMO Based 4G/5G Systems

2021 ◽  
Author(s):  
Vinodh Kumar Minchula ◽  
Gottapu Sasibhushana Rao
Keyword(s):  
Performance Analysis ◽  
Power Allocation ◽  
Channel Capacity ◽  
Mimo Systems ◽  
Antenna Selection ◽  
Singular Values ◽  
Channel State ◽  
Transmission Strategy ◽  
Adaptive Power ◽  
Antenna Systems

For a time varying channel, the channel capacity is determined by the Channel State Information (CSI) or its fading distribution at a transmitter or receiver. If CSI is perfectly known at both the transmitter and receiver, then the transmitter can adapt to its optimal transmission strategy (i.e., optimal antenna selection by power allocation scheme) relative to its instantaneous channel state for capacity enhancement. In the case where the channel information is not available at the transmitter (No CSIT), the transmitted power has to be distributed equally (i.e., uniform power allocation) between the transmitting antennas to improve the channel capacity. The IWFA (Iterative water filling allocation) strategy therefore allocates power to those spatial channels with positive non-zero singular values i.e. good quality channels and discards the lower eigenmodes channels resulting in maximum capacity in MIMO systems for perfect CSIT. In this chapter, the performance analysis of Multi Antenna systems under ICSIT/ICSIR, Perfect CSIT, No CSIT channel conditions have been implemented and a novel adaptive power allocation algorithm (SVD-based IWFAA) is considered to improve the spectral efficiency of next generation wireless MIMO communication (4G–5G). The algorithm considered is more efficient at high noise levels (low SNRs) under Perfect CSIT conditions because the strongest channel eigenmodes are allocated more power.

Research on Fast Diversity and Multiplexing Selection Algorithm for Multi-Antenna Systems

2013 ◽  
Vol 380-384 ◽  
pp. 3970-3973
Author(s):  
Nuan Feng
Keyword(s):  
Mimo Systems ◽  
Transmission Rate ◽  
Antenna System ◽  
Spatial Multiplexing ◽  
Multiple Antenna ◽  
Selection Algorithm ◽  
Transmission Performance ◽  
Linear Receiver ◽  
Transmission Reliability ◽  
Antenna Systems

The multi-antenna systems employ both diversity and spatial multiplexing, which have a trade off relationship. This thesis is analyzing linear receiver with multiple antenna system of spatial multiplexing, on the premise of providing large information transmission rate and capacity and transmission reliability, giving a quick selection algorithm based on the BER guidelines diversity multiplexing mode. The algorithm is selecting diversity multiplexed mode by less complicated multi-antenna systems, at the same time, sending a small amount of information back to the sender, to achieve the full advantage of multi-antenna systems diversity and multiplexing. This algorithm can make full use of diversity multiplexing MIMO systems, having better transmission performance and low computational complexity.

scholarly journals FRACTAL ANTENNA – WIRELESS COMMUNICATION NEW BEGINNING BREAKTHROUGH IN DIGITAL ERA

2020 ◽  
Vol 4 (1) ◽  
pp. 01-06
Author(s):  
Anand Mohan ◽  
M Sundararajan
Keyword(s):  
Wireless Communication ◽  
Geometrical Shape ◽  
Surface Zone ◽  
Fractal Antenna ◽  
Multiband Antennas ◽  
Digital Era ◽  
New Beginning ◽  
Novel Traits ◽  
Comparative Structure ◽  
Antenna Systems

In this digital era, we are subject to cellular gadgets, there has been an expanding demand in antennas that are smaller, conformal, and broadband. Fractal antenna wire utilizes a self-comparative structure to expand the length of a material in an all-out surface zone. Fractal Antenna Systems creates and constructs the smaller, most astounding execution Wideband/multiband antennas on the planet. These antennas are regularly two to multiple times smaller than conventional aerials, while accomplishing remarkable recurrence inclusion and magnificent gains and power designs. Fractal Antenna’s items have been demonstrated in the toughest business, military, and government applications. Fractal antennas apparatuses depend on mind boggling rehashing geometrical shape shaving novel traits that make them particularly significant for broadcast communications and different remote needs. Their requirements are not well met by Traditional antennas apparatuses. Applications for fractal geometries in cell gadgets have turned out to be hotly debated issues of research in science and building due to buyer request.

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