Analysis of a New Scheme Mitigating the Impact of Inter-Carrier Interference on OFDM Communication Systems

2006 ◽  
Author(s):  
Zhao Li ◽  
Zhang Ping
Keyword(s):  
Communication Systems ◽  
The Impact

The Effect of Information Technology on Fluidity of Contemporary Architectural Space

2019 ◽  
Vol 7 (1) ◽  
pp. 62-72
Author(s):  
Shatha Abbas Hassan ◽  
Noor Ali Aljorani
Keyword(s):  
Information Technology ◽  
Communication Systems ◽  
Research Problem ◽  
Architectural Space ◽  
Human Thought ◽  
Technological Developments ◽  
Ease Of Access ◽  
The Impact ◽  
Role Of Information

The increasing importance of the information revolution and terms such as ‘speed’, ‘disorientation’, and ‘changing the concept of distance’, has provided us with tools that had not been previously available. Technological developments are moving toward Fluidity, which was previously unknown and cannot be understood through modern tools. With acceleration of the rhythm in the age we live in and the clarity of the role of information technology in our lives, as also the ease of access to information, has helped us to overcome many difficulties. Technology in all its forms has had a clear impact on all areas of daily life, and it has a clear impact on human thought in general, and the architectural space in particular, where the architecture moves from narrow spaces and is limited to new spaces known as the ‘breadth’, and forms of unlimited and stability to spaces characterized with fluidity. The research problem (the lack of clarity of knowledge about the impact of vast information flow associated with the technology of the age in the occurrence of liquidity in contemporary architectural space) is presented here. The research aims at defining fluidity and clarifying the effect of information technology on the changing characteristics of architectural space from solidity to fluidity. The research follows the analytical approach in tracking the concept of fluidity in physics and sociology to define this concept and then to explain the effect of Information Technology (IT) to achieve the fluidity of contemporary architectural space, leading to an analysis of the Skidmore, Owings and Merrill (SOM) architectural model. The research concludes that information technology achieves fluidity through various tools (communication systems, computers, automation, and artificial intelligence). It has changed the characteristics of contemporary architectural space and made it behave like an organism, through using smart material.

scholarly journals Influence of Aircraft Power Electronics Processing on Backup VHF Radio Systems

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 777
Author(s):  
Jan Leuchter ◽  
Radim Bloudicek ◽  
Jan Boril ◽  
Josef Bajer ◽  
Erik Blasch
Keyword(s):  
Power Electronics ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Intermediate Frequency ◽  
Radio Communication ◽  
Very High Frequency ◽  
Switching Power ◽  
Radio Systems ◽  
The Impact

The paper describes the influence of power electronics, energy processing, and emergency radio systems (ERS) immunity testing on onboard aircraft equipment and ground stations providing air traffic services. The implementation of next-generation power electronics introduces potential hazards for the safety and reliability of aircraft systems, especially the interferences from power electronics with high-power processing. The paper focuses on clearly identifying, experimentally verifying, and quantifiably measuring the effects of power electronics processing using switching modes versus the electromagnetic compatibility (EMC) of emergency radio systems with electromagnetic interference (EMI). EMI can be very critical when switching power radios utilize backup receivers, which are used as aircraft backup systems or airport last-resort systems. The switching power electronics process produces interfering electromagnetic energy to create problems with onboard aircraft radios or instrument landing system (ILS) avionics services. Analyses demonstrate significant threats and risks resulting from interferences between radio and power electronics in airborne systems. Results demonstrate the impact of interferences on intermediate-frequency processing, namely, for very high frequency (VHF) radios. The paper also describes the methodology of testing radio immunity against both weak and strong signals in accordance with recent aviation standards and guidance for military radio communication systems in the VHF band.

scholarly journals Numerical Evaluation of the Effect of Geometric Tolerances on the High-Frequency Performance of Graphene Field-Effect Transistors

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3121
Author(s):  
Monica La Mura ◽  
Patrizia Lamberti ◽  
Vincenzo Tucci
Keyword(s):  
High Frequency ◽  
Communication Systems ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Field Effect Transistors ◽  
Channel Length ◽  
Geometrical Parameters ◽  
Effect Transistor ◽  
Rf Performance ◽  
The Impact

The interest in graphene-based electronics is due to graphene’s great carrier mobility, atomic thickness, resistance to radiation, and tolerance to extreme temperatures. These characteristics enable the development of extremely miniaturized high-performing electronic devices for next-generation radiofrequency (RF) communication systems. The main building block of graphene-based electronics is the graphene-field effect transistor (GFET). An important issue hindering the diffusion of GFET-based circuits on a commercial level is the repeatability of the fabrication process, which affects the uncertainty of both the device geometry and the graphene quality. Concerning the GFET geometrical parameters, it is well known that the channel length is the main factor that determines the high-frequency limitations of a field-effect transistor, and is therefore the parameter that should be better controlled during the fabrication. Nevertheless, other parameters are affected by a fabrication-related tolerance; to understand to which extent an increase of the accuracy of the GFET layout patterning process steps can improve the performance uniformity, their impact on the GFET performance variability should be considered and compared to that of the channel length. In this work, we assess the impact of the fabrication-related tolerances of GFET-base amplifier geometrical parameters on the RF performance, in terms of the amplifier transit frequency and maximum oscillation frequency, by using a design-of-experiments approach.

scholarly journals MMSE-NP-RISIC-Based Channel Equalization for MIMO-SC-FDE Troposcatter Communication Systems

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Zedong Xie ◽  
Xihong Chen ◽  
Xiaopeng Liu ◽  
Yu Zhao
Keyword(s):  
Interference Cancellation ◽  
Communication Systems ◽  
Intersymbol Interference ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Channel Equalization ◽  
Single Input Single Output ◽  
Single Carrier ◽  
Single Output ◽  
The Impact

The impact of intersymbol interference (ISI) on single-carrier frequency-domain equalization with multiple input multiple output (MIMO-SC-FDE) troposcatter communication systems is severe. Most of the channel equalization methods fail to solve it completely. In this paper, given the disadvantages of the noise-predictive (NP) MMSE-based and the residual intersymbol interference cancellation (RISIC) equalization in the single input single output (SISO) system, we focus on the combination of both equalization schemes mentioned above. After extending both of them into MIMO system for the first time, we introduce a novel MMSE-NP-RISIC equalization method for MIMO-SC-FDE troposcatter communication systems. Analysis and simulation results validate the performance of the proposed method in time-varying frequency-selective troposcatter channel at an acceptable computational complexity cost.

scholarly journals Vehicle-to-Vehicle Radio Channel Characteristics for Congestion Scenario in Dense Urban Region at 5.9 GHz

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Yishui Shui ◽  
Fang Li ◽  
Junyi Yu ◽  
Wei Chen ◽  
Changzhen Li ◽  
...  
Keyword(s):  
Communication Systems ◽  
Radio Channel ◽  
Average Power ◽  
Urban Region ◽  
Doppler Spectrum ◽  
Small Scale ◽  
Power Delay Profile ◽  
Car Following ◽  
Vehicle To Vehicle ◽  
The Impact

This paper reports the results of a car-following measurement of the wireless propagation channel at 5.9 GHz on a seriously congested urban road in Wuhan, China. The small-scale amplitude-fading distribution was determined to be a Ricean distribution using the Akaike information criterion. This result shows that this car-following scenario can be regarded as a line-of-sight radio channel. Moreover, the statistical K-factor features follow a Gaussian distribution. According to the power delay profile and average power delay profile, we found that street buildings in this dense urban environment contributed to very strong reflection phenomena. The impact of a powerful reflection is analyzed through path loss, delay, and Doppler spreads in the channel statistical properties. In the frequency domain, we observe a U-shape delay-Doppler spectrum that proved that the dense urban scenario consists of scattering channels. All these results are summarized in tabular form that will be useful in the modeling of vehicle-to-vehicle wireless communication systems.

The Impact of Information Technology (IT) on Assessing the Quality of Notifications Based on Standard No. 2420 in the Public Sector in Kuwait

2021 ◽  
Vol 13 (8) ◽  
pp. 88
Author(s):  
Bader H. O. Alshammari ◽  
Sulieman Hussien Albeshtawi
Keyword(s):  
Information Technology ◽  
Statistical Analysis ◽  
Public Sector ◽  
Communication Systems ◽  
Internal Audit ◽  
The Public ◽  
Several Variables ◽  
The Impact ◽  
Public Bodies

The researcher aimed to explore impact of information technology (IT) on assessing the quality of notifications based on standard No. 2420 in the public sector in Kuwait. He aimed to explore the impact of several variables - like: computers & software, communication systems, and IT users’ skills – on the quality of notifications based on standard No. 2420 in the public sector in Kuwait. The population consists from all the internal audit departments in ministries and public bodies in Kuwait. The researcher has chosen a conveyance sample consisting from 200 individuals. He distributed questionnaire forms to them. 167 questionnaire forms were retrieved. They are valid for statistical analysis. The researcher found that information technology (IT) has a significant impact on assessing the quality of notifications based on standard No. 2420 in the public sector in Kuwait.

scholarly journals Optical Quantum Memory and its Applications in Quantum Communication Systems

2020 ◽  
Vol 125 ◽  
Author(s):  
Lijun Ma ◽  
Oliver Slattery ◽  
Xiao Tang
Keyword(s):  
Communication Systems ◽  
Quantum Systems ◽  
Quantum Memory ◽  
Research Progress ◽  
Quantum Communications ◽  
Quantum Repeater ◽  
Quantum Networks ◽  
And Performance ◽  
The Impact ◽  
Photon Source

Optical quantum memory is a device that can store the quantum state of photons and retrieve it on demand and with high fidelity. It is emerging as an essential device to enhance security, speed, scalability, and performance of many quantum systems used in communications, computing, metrology, and more. In this paper, we will specifically consider the impact of optical quantum memory on quantum communications systems. Following a general overview of the theoretical and experimental research progress in optical quantum memory, we will outline its role in quantum communications, including as a photon source, photon interference, quantum key distribution (QKD), quantum teleportation, quantum repeater, and quantum networks.

scholarly journals Framing stress and associated behaviours at work

2019 ◽  
Vol 26 (11) ◽  
pp. 2566-2580
Author(s):  
Paul Hampton ◽  
Ezekiel A. Chinyio ◽  
Silvia Riva
Keyword(s):  
Interpersonal Relationships ◽  
Communication Systems ◽  
Work Performance ◽  
Well Being ◽  
Psychological Services ◽  
Content Type ◽  
Work Related ◽  
Related Stress ◽  
Ethnographic Methodology ◽  
The Impact

Purpose The purpose of this paper is to understand more precisely the culture and interpersonal behaviours associated with stress. Design/methodology/approach The research was conducted using a qualitative approach through an ethnographic methodology in relation to three companies. The greater part of the data collection period was structured into observations that ranged between 2 and 4 hr per day, 1–3 days per week, for a period of six months. A total of ten sites were explored; and on each site, the observations involved activities by 5–20 people. Findings The results showed the pivotal importance of interpersonal relationships in coping with the uncertainty of working conditions, the coordination of teamwork and managing responsibilities and power interactions. It was found that the impact of stress is multifaceted, affecting the physical status, interpersonal relationships, work performance and emotional well-being of construction workers. The workers who were studied emphasised five sources of support that help moderate work-related stress: additional tools such as communication systems and software, a facilitated access to professional help (e.g. psychological services), organisational changes in leadership, provision of resources for the well-being of personnel (e.g. job training) and better teamwork. Practical implications The study underlines the importance of dedicated services for stress management and specific training-related abilities devoted to reinforcing positive person–organisation dynamics. In particular, the abilities should relate to managing the impact of stress in terms of physique, interpersonal relationships, work performance and emotional well-being. Originality/value This is one of the first studies to adopt a psychological perspective for understanding construction scenarios and phenomena and was conducted by a qualified psychologist.

scholarly journals Improvement in the Poverty Status of Ecological Migrants under the Urban Resettlement Model: An Empirical Study in China

2020 ◽  
Vol 12 (5) ◽  
pp. 2084 ◽  
Author(s):  
Shijie Guo ◽  
Guichang Liu ◽  
Qi Zhang ◽  
Fang Zhao ◽  
Guomin Ding
Keyword(s):  
Communication Systems ◽  
Multinomial Logistic Regression ◽  
Ecological Environment ◽  
Chinese Government ◽  
Observation Data ◽  
Exact Matching ◽  
Industrial Transformation ◽  
Promotion Effect ◽  
Basic Infrastructure ◽  
The Impact

As a major measure of ecological environment protection, ecological migration addresses the conflict between humans and the ecological environment. The Urban Resettlement Model is a prevalent resettlement model used by the Chinese government to try to alleviate poverty brought about by the ecological environment by promoting migration. This study initially explored the mechanism of influencing the livelihoods of relocated households in the Urban Resettlement Model by analyzing questionnaire data obtained from farmers in the resettlement area of Nangqian County. The coarsened exact matching (CEM) model was used to control the influence of confounding factors in the observation data. Next, a disordered multinomial logistic regression model was used to analyze the impact and effect of the Urban Resettlement Model on the livelihoods of the relocated non-agricultural farmers and poor relocated households. The results show that the Urban Resettlement Model has a significant promotion effect on the non-agricultural livelihoods of the relocated farmers. For all relocated households, the presence of medical facilities exhibited a significant promotion effect on the non-agricultural livelihoods of the relocated farmers. For poor relocated households, convenient transportation facilities facilitated the pursuit of non-agricultural livelihoods such as migrant work. However, industrial support, employment support, or training had no statistically significant effects on all relocated households or poor relocated households. The number of family laborers and communication costs were significant promoting influences for all relocated households and poor relocated households to engage in part-time and non-agricultural livelihoods. There was a certain impact of relocation time on livelihood choice for the relocated farmers, but there was no significant impact for poor relocated households. Based on these findings, the following suggestions are proposed. Supporting industries should be provided and industrial transformation and upgrading efforts should be strengthened during the application of the Urban Resettlement Model to create job opportunities for relocated people. Additionally, enhanced construction of basic infrastructure, including transportation, medical care, and communication systems is required. The results of this work should facilitate the effective improvement of administration of the ecological resettlement environmental protection policy system.

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