scholarly journals Performance of BER with Different Diversity Techniques for Millimeter-Wave Communication System

2019 ◽  
Vol 8 (6S4) ◽  
pp. 1149-1152 ◽  
Keyword(s):  
Antenna Arrays ◽  
Communication System ◽  
Mimo Systems ◽  
Multipath Propagation ◽  
Line Of Sight ◽  
60 Ghz ◽  
Diversity Techniques ◽  
Single Output ◽  
Single Input ◽  
Diversity Technique

In a communications system, a diversity technique is used to enhance the reliability of a message signal by using at least two channels with different characteristics. In this paper, all four possible scenarios are considered: Single-input and singleoutput (SISO), single input and multi-output (SIMO), multipleinput and single-output (MISO), Multiple-input and multiple output (MIMO) systems. Antenna arrays will be used to reduce BER and improve the performance of the system using array gain in the line of sight channel for 60 GHz frequency in an indoor scenario. Single input and single output are investigated before analysis of multiple inputs and multiple output channel in the line of sight (LOS) and multipath propagation. MATLAB simulation has been performed using BPSK modulation. The comparative studies show that the performance of the MIMO diversity technique is more reliable in terms of BER to improve the performance and efficiency of the communication system.

Experimental evaluation of line-of-sight multiple input multiple output (MIMO) transmission for sub-6 GHz carrier frequencies

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Darko Cvetkovski ◽  
Thomas Schlegel ◽  
Eckhard Grass
Keyword(s):  
Mimo Systems ◽  
Multipath Propagation ◽  
Multiple Input Multiple Output ◽  
Mimo Channel ◽  
Line Of Sight ◽  
Wave Band ◽  
60 Ghz ◽  
Multiplexing Gain ◽  
Single Carrier ◽  
Outdoor Environments

Abstract For the next generation wireless networks, backhaul links with data rates of several Gbit/s are required. Line-of-Sight-MIMO with optimally arranged antennas can exploit the full multiplexing gain of orthogonal MIMO streams to achieve high throughput, as shown in recent works utilizing the 60 GHz mm wave band. In contrast, conventional MIMO systems operating at sub-6 GHz carrier frequencies, as utilized in modern WLAN networks, rely on rich scattering channels to enable reliable transmissions. In this work, we explore the feasibility of applying the LoS-MIMO concept to wireless single-carrier links operating at sub-6 GHz frequencies. For this, we investigate the sub-6 GHz LoS-MIMO channel in a 4 × 4 MIMO configuration by performing measurements in an anechoic chamber and an outdoor backhaul-like environment. In addition, different adaptive equalizers are evaluated. The results show, that the LoS-MIMO concept holds for sub-6 GHz frequencies both in pure LoS and in outdoor environments. It provides high multiplexing gain; however, the multipath propagation limits the potential performance of the equalizers in terms of achievable BER.

scholarly journals High Throughput Line-of-Sight MIMO Systems for Next Generation Backhaul Applications

Frequenz ◽  
2017 ◽  
Vol 71 (9-10) ◽  
pp. 389-398
Author(s):  
Xiaohang Song ◽  
Darko Cvetkovski ◽  
Tim Hälsig ◽  
Wolfgang Rave ◽  
Gerhard Fettweis ◽  
...  
Keyword(s):  
High Throughput ◽  
Mimo Systems ◽  
Next Generation Networks ◽  
Line Of Sight ◽  
60 Ghz ◽  
Channel Measurements ◽  
Next Generation ◽  
Wireless Backhaul ◽  
Baseband Processing ◽  
Theoretical Foundations

Abstract The evolution to ultra-dense next generation networks requires a massive increase in throughput and deployment flexibility. Therefore, novel wireless backhaul solutions that can support these demands are needed. In this work we present an approach for a millimeter wave line-of-sight MIMO backhaul design, targeting transmission rates in the order of 100 Gbit/s. We provide theoretical foundations for the concept showcasing its potential, which are confirmed through channel measurements. Furthermore, we provide insights into the system design with respect to antenna array setup, baseband processing, synchronization, and channel equalization. Implementation in a 60 GHz demonstrator setup proves the feasibility of the system concept for high throughput backhauling in next generation networks.

scholarly journals Utilization of MIMO Concept for Optical Communication System under Fog Condition

2019 ◽  
Vol 17 (2) ◽  
pp. 130-135
Author(s):  
Farouk Shakir ◽  
Mazin Ali A. Ali ◽  
Firas Ameer
Keyword(s):  
Mimo Systems ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Cost Effective ◽  
Free Space Optical ◽  
Single Input Single Output ◽  
High Data ◽  
Single Output ◽  
Received Power ◽  
Single Input

Free-space optical (FSO) communication consider license free, high data rate, wide bandwidth and cost-effective. Multi-input Multi-output (MIMO) systems can be employed to reduce the attenuation by heavy fog and improve FSO channel capacity. In this paper a single-input single-output and multi–input multi-output examined to investigate the performance of these systems under heavy fog. A comparison is made in terms of received optical power, signal to noise ratio, and bit error rate (BER) using OptiSystem version 7.0. The signal reaches to link up to 1.7km, 1.55km, 1.5km, and 1.4km for 4Tx/4Rx, 3Tx/3Rx, 2Tx/2Rx, 1Tx/1Rxrespectively. The results showed that the quality of received power is enhancement by using up to four beams.

scholarly journals Implementation of 4x4 Mimo with Zigbee

2019 ◽  
pp. 147-152
Author(s):  
T. Monish ◽  
B. Rupekeshan ◽  
B. Rajamanikkam
Keyword(s):  
Wireless Communications ◽  
Smart Antenna ◽  
Multipath Propagation ◽  
Wireless Internet ◽  
Additional Signal ◽  
Multiple Outputs ◽  
Single Antenna ◽  
Single Output ◽  
Multipath Effects ◽  
Single Input

MIMO (multiple inputs, multiple outputs) is an antenna technology for wireless communications in which multiple antennas are used at both the source (transmitter) and the destination (receiver). The antennas at each end of the communications circuit are combined to minimize errors and optimize data speed. MIMO is one of several forms of smart antenna technology, the others being MISO (multiple inputs, single output) and SIMO (single input, multiple outputs). In conventional wireless communications, a single antenna is used at the source, and another single antenna is used at the destination. In some cases, this gives rise to problems with multipath effects. In digital communications systems such as wireless Internet, it can cause a reduction in data speed and an increase in the number of errors. The use of two or more antennas, along with the transmission of multiple signals (one for each antenna) at the source and the destination, eliminates the trouble caused by multipath wave propagation, and can even take advantage of this effect.This was only the first step as system then started to utilize the multipath propagation to advantage, turning the additional signal paths effectively be considered as additional channels to carry additional data.

scholarly journals Implementation of Hybrid Precoding for MIMO System Using Kalman Approach

2021 ◽  
Vol 9 (VII) ◽  
pp. 3380-3385
Author(s):  
Shamlet Divya
Keyword(s):  
Antenna Arrays ◽  
Mimo System ◽  
Multipath Propagation ◽  
Path Loss ◽  
Practical Method ◽  
Antenna System ◽  
Main Role ◽  
60 Ghz ◽  
Hardware Complexity ◽  
Hybrid Precoding

Multiple antenna system in communication is a main role to serve a multiple users at a time simultaneously in future wireless communication system. The MIMO specifically refers to practical method for sending and receiving the data more than one signal at a time over the same radio frequency channel by exploring the multipath propagation. MIMO is fundamentally a special form smart antenna system modified to enhance the performance of a data signal, such as Beamforming / Precoding and diversity. In millimeter wave 60 GHz band requires a large no of antenna arrays at two sides of transmitter and receiver terminals to beam forming gains, in a way to counteract the high path loss. There are many Precoding methods existing, like Zero Forcing (ZF) method, Branch and Bound (B&B) method and Hybrid method. In the form of fully digital method it’s not possible to do with more no of antenna arrays due to hardware complexity at such ranges, while coming to purely analog also suffers the bad performance circumstances. Hence we propose a Hybrid Precoding method in Digital/Analog in the multi user scenario based on the Kalman approach. To mainly reduce the errors between transmitted data to estimated data. Simulation results validates that immense improvement and better performance is achieved compared to existing precoding methods in terms of BER and spectral efficiency.

Analysis and synthesis of single-input-single-output Lurie type systems via H∞ mixed-sensitivity

2021 ◽  
pp. 014233122110259
Author(s):  
Rafael F Pinheiro ◽  
Diego Colón
Keyword(s):  
Absolute Stability ◽  
Mimo Systems ◽  
Type Systems ◽  
New Approach ◽  
Single Input Single Output ◽  
Single Output ◽  
Analysis And Synthesis ◽  
Single Input ◽  
Performance Problem ◽  
The Absolute

The goal of this paper is to present a different approach to the analysis of the absolute stability of Lurie type systems in the single-input-single-output (SISO) case using robust control theory. The proposed technique enables the design of controllers via [Formula: see text] mixed-sensitivity (S/KS/T), where, besides making the system absolutely stable, the performance problem can also be solved. In addition, it is also demonstrated that it is possible to make use of this new approach in time-delay Lurie type systems. Thus, through a new methodology, this work paves the way to the study of the absolute stability of multiple-inputs-multiple-outputs (MIMO) systems, aiming at a better generalization of the theory and enabling applications in other areas, such as neural networks. Examples, numerical simulations and application in Chua’s circuit are given to illustrate the results.

scholarly journals Space-Time-Color (STC) Scheme with Symbol-Hopping for Color Shift Keying (CSK)Modulation

2021 ◽  
Author(s):  
Leandro Ximenes ◽  
Rangel Arthur ◽  
igor Santos Cruz Rodrigues
Keyword(s):  
Mimo Systems ◽  
Communication Link ◽  
Visible Light Communications ◽  
Single Output ◽  
Multiple Input ◽  
Shift Keying ◽  
Single Input ◽  
Diversity Gains ◽  
Csk Constellation ◽  
Siso Systems

<div>This paper proposes a novel coding scheme for Visible Light Communications (VLC) systems using symbol mapping permutations on the color domain. The permutation is done through symbol-hopping over the points of an optimized 4-CSK constellation. This scheme provides diversity gains, promises robustness against monochromatic channel degradation, and increases the information security of the communication link. It can also be used in conjunction with Single-Input and Single-Output (SISO) systems, as well as in Multiple-Input and Multiple-Output (MIMO) systems. Monte Carlo computational simulations evaluate the performance of the proposed scheme over the conventional QuadLED (QLED) CSK system and other codes, showing superior coding and diversity gains over two direct competitors, under a Rician flat-fading channel.</div>

Comparative Study of Three Output-Error Multi-Input Multi-Output Identification Methods

2020 ◽  
Author(s):  
Renato A. L. de Andrade ◽  
Péricles R. Barros
Keyword(s):  
Least Squares ◽  
Mimo Systems ◽  
Single Input Single Output ◽  
Identification Methods ◽  
Output Error ◽  
Single Output ◽  
Regression Algorithms ◽  
Intrinsic Complexity ◽  
Order Of Magnitude ◽  
Single Input

Multi-input multi-output (MIMO) systems have been a major concern for decades. However, due to the intrinsic complexity raised by the process interactions and optimization issues, MIMO approaches have not been developed as extensively as the single-input single-output ones. Recently, nevertheless, several algorithms have been proposed to address this problem, most of them based on recursive algorithms and many dependent on the assumption that the transfer function denominator polynomials are the same for all subsystems. In this article, an iterative least-squares-based algorithm, a pseudolinear regression and a Gauss-Newton optimization-based algorithm are proposed to provide a continuous-time output-error multi-input single-output model by means of iterative strategies. The numerical simulations indicate the iterative least-squares-based and the pseudo-linear regression algorithms have similar performances and generate more accurate and precise estimates than the Gauss-Newton one, which presented averages and standard deviations of the parameters ranging from twice as large to one order of magnitude higher than those of the other two algorithms.

Sign in / Sign up

Export Citation Format

Share Document