ESTIMATION OF THE IMPULSE RESPONSE OF COMMUNICATION CHANNEL WITH MEMORY FOR THE OFDM SYSTEM

2020 ◽  
Author(s):  
В.Г. КАРТАШЕВСКИЙ ◽  
К.С. СЛИПЕНЧУК
Keyword(s):  
Impulse Response ◽  
Regularization Method ◽  
Communication Channel ◽  
Communication Channels ◽  
Ofdm System ◽  
Wise Decision ◽  
Transmitted Signal ◽  
With Memory ◽  
Ofdm Signals ◽  
Selection Of

Рассмотрена проблема оценивания методом регуляризации импульсной характеристики канала связи с памятью при приеме сигналов OFDM с использованием алгоритма «прием в целом с поэлементным принятием решений». Предлагаются варианты новых структур потока OFDM-символов с исключением защитных интервалов и включением испытательной комбинации (ИК)в структуру передаваемого сигнала при наличии памяти в каналах связи; для быстроизменяющихся каналов предлагается частая вставка ИК. Подбор ИК позволяет улучшить показатели качества оценивания импульсных характеристик методом регуляризации при наличии памяти в каналах связи. The problem of estimating the impulse response of the communication channel with memory when receiving OFDM signals using the "reception in general with element-wise decision-making" (RGEWDM) algorithm by the regularization method is considered. Variants of new structures of a stream of OFDM symbols are proposed with the exclusion of guard intervals and the inclusion of a test combination (TC) in the structure of the transmitted signal in the presence of memory in the communication channels; for rapidly changing channels frequent insertion of TC is proposed. The selection of TCs allows improving the quality indicators of impulse response estimation by the regularization method in the presence of memory in communication channels.

Communication and Teleworking: A Study of Communication Channel Satisfaction, Personality, and Job Satisfaction for Teleworking Employees

2015 ◽  
Vol 55 (1) ◽  
pp. 44-68 ◽  
Author(s):  
Stephanie A. Smith ◽  
Alyssa Patmos ◽  
Margaret J. Pitts
Keyword(s):  
Job Satisfaction ◽  
Communication Channel ◽  
Online Survey ◽  
Communication Channels ◽  
Personality Types ◽  
Video Communication ◽  
Communication Satisfaction ◽  
Moderating Effects ◽  
The Relationship ◽  
Practical Implications

This study examines teleworkers’ job satisfaction related to the use of and satisfaction with a variety of communication channels and workers’ personality type. U.S. teleworkers ( N = 384) completed an online survey and self-reported on dimensions of communication channel satisfaction, job satisfaction, and personality. Results indicated that extraversion, openness, agreeableness, and conscientiousness are positively correlated with job satisfaction. Additionally, significant moderating effects were found for the relationship between openness and phone and video communication, and agreeableness and phone communication on job satisfaction. Findings from this study yield important practical implications for organizations including suggestions for optimizing communication satisfaction for employees of differing personality types and recommendations to help organizations effectively hire and retain teleworkers.

The Weight of Fear of Violence in Household Budgets

2021 ◽  
pp. 073401682110383
Author(s):  
Bruno Truzzi ◽  
Marcelo Justus ◽  
Henrique C. Kawamura ◽  
Thomas V. Conti
Keyword(s):  
Instrumental Variables ◽  
Regularization Method ◽  
Household Level ◽  
Household Spending ◽  
Goods And Services ◽  
Level Ii ◽  
The Stability ◽  
The Relationship ◽  
Selection Of

This article investigates the relationship between the perception of violence and the spending on security goods and services in households. Individual microdata from a random national survey on family budget carried out in Brazil in 2008-2009 were used for modeling the household spending using two instrumental variables. The stability of results was checked by applying the Lasso-Gaussian regularization method in the selection of the statistically significant variables. Positive relationships were found between household spending on security goods and services and (i) the fear of insecurity at the household level, (ii) the neighbors’ spending on security, and (iii) the registered criminality, but no evidence was found on the relationship between the role of police on household spending on security goods and services.

Digging deep? Digging more? A research on the influence of corporate CSR theme consistency strategy

2018 ◽  
Vol 1 (1) ◽  
pp. 76-93 ◽  
Author(s):  
Yang Zhang ◽  
Xuhui Wang ◽  
Yingying Shen
Keyword(s):  
Communication Channel ◽  
Information Dissemination ◽  
Focal Point ◽  
Social Programs ◽  
Business Practices ◽  
Content Type ◽  
Moderation Effect ◽  
Corporate Social ◽  
And Behavior ◽  
Selection Of

PurposeAs the focal point of both academic studies and business practices, the theme strategy of corporate social responsibility (CSR) arouses wide attention. However, extant studies concentrate more on the selection of the theme of CSR activities, such as the fitness between CSR activities and the core business, thus largely neglecting the consistency of the theme. The purpose of this paper is to determine whether the enterprise should adopt a consistent theme strategy or should participate in different social programs, and how do customers response to the lack of studies in different theme-consistent strategies.Design/methodology/approachIn this paper, two progressive experiments are performed. The purpose of study 1 is to examine the influence of theme consistency on consumers’ CSR association and how consumers’ attribution to corporation motivation mediates such impacts. The purpose for study 2 is to examine whether information dissemination channels and cooperation with public organization could affect the influence of theme consistency strategy.FindingsThe significant influences of theme consistency on consumer CSR association was demonstrated, and consumer’s perceived motivation of CSR was found to play the mediation role. Moreover, the moderation effect of the communication channel of CSR information was found to be important to strengthen the influence of the theme-consistent strategy.Originality/valueThis paper not only demonstrates the influence of theme consistency, but also explains how theme consistency influences consumers’ attitude and behavior. It enriches the study on the antecedent variables of consumers’ attribution to corporate motivation.

scholarly journals Patterns of Patients’ Interactions With a Health Care Organization and Their Impacts on Health Quality Measurements: Protocol for a Retrospective Cohort Study (Preprint)

2018 ◽  
Author(s):  
Arriel Benis ◽  
Nissim Harel ◽  
Refael Barak Barkan ◽  
Einav Srulovici ◽  
Calanit Key
Keyword(s):  
Health Care ◽  
Data Analysis ◽  
Communication Channel ◽  
Clustering Algorithm ◽  
Health Care Organizations ◽  
Health Care Organization ◽  
Communication Channels ◽  
Care Organization ◽  
Care Providers ◽  
Different Types

BACKGROUND Data collected by health care organizations consist of medical information and documentation of interactions with patients through different communication channels. This enables the health care organization to measure various features of its performance such as activity, efficiency, adherence to a treatment, and different quality indicators. This information can be linked to sociodemographic, clinical, and communication data with the health care providers and administrative teams. Analyzing all these measurements together may provide insights into the different types of patient behaviors or more accurately to the different types of interactions patients have with the health care organizations. OBJECTIVE The primary aim of this study is to characterize usage profiles of the available communication channels with the health care organization. The main objective is to suggest new ways to encourage the usage of the most appropriate communication channel based on the patient’s profile. The first hypothesis is that the patient’s follow-up and clinical outcomes are influenced by the patient’s preferred communication channels with the health care organization. The second hypothesis is that the adoption of newly introduced communication channels between the patient and the health care organization is influenced by the patient’s sociodemographic or clinical profile. The third hypothesis is that the introduction of a new communication channel influences the usage of existing communication channels. METHODS All relevant data will be extracted from the Clalit Health Services data warehouse, the largest health care management organization in Israel. Data analysis process will use data mining approach as a process of discovering new knowledge and dealing with processing data extracted with statistical methods, machine learning algorithms, and information visualization tools. More specifically, we will mainly use the k-means clustering algorithm for discretization purposes and patients’ profile building, a hierarchical clustering algorithm, and heat maps for generating a visualization of the different communication profiles. In addition, patients’ interviews will be conducted to complement the information drawn from the data analysis phase with the aim of suggesting ways to optimize existing communication flows. RESULTS The project was funded in 2016. Data analysis is currently under way and the results are expected to be submitted for publication in 2019. Identification of patient profiles will allow the health care organization to improve its accessibility to patients and their engagement, which in turn will achieve a better treatment adherence, quality of care, and patient experience. CONCLUSIONS Defining solutions to increase patient accessibility to health care organization by matching the communication channels to the patient’s profile and to change the health care organization’s communication with the patient to a highly proactive one will increase the patient’s engagement according to his or her profile. INTERNATIONAL REGISTERED REPOR RR1-10.2196/10734

Adoption of Social Media as Communication Channels in Government Agencies

2018 ◽  
pp. 773-807
Author(s):  
Reemiah Alotaibi ◽  
Muthu Ramachandran ◽  
Ah-Lian Kor ◽  
Amin Hosseinian-Far
Keyword(s):  
Social Media ◽  
Communication Channel ◽  
Communication Channels ◽  
Extensive Literature ◽  
Public Agencies ◽  
Wide Range ◽  
Level Of Use ◽  
The World ◽  
The Government ◽  
Use Of Social Media

Social media has become an integral part of many people's lives around the world. The main use of this communication channel is to connect with social circles. It is also widely used for commercial and business purposes. Governments are also keen to use social media as an alternative to the traditional communication channels. Nonetheless, when the level of use of social media in the government is compared to other fields, a clear gap becomes apparent. This chapter investigates the adoption of social media as a communication channel between citizens, public agencies and government departments; and considers a wide range of factors that affect the issue from the perspective of public agencies. This chapter presents an extensive literature review and proposes a framework that organises the critical factors that affect public agencies' efforts while implementing social media. We also provide a list of hypotheses to validate and evaluate the significance of these factors.

Generalized Trapezoidal Companding Technique for PAPR Reduction in OFDM Systems

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Saruti Gupta ◽  
Ashish Goel
Keyword(s):  
Bit Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Average Power ◽  
Frequency Division ◽  
Performance Parameters ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Ofdm Signal ◽  
Specific Degree ◽  
Ofdm Signals

Abstract The main drawback in the performance of the Orthogonal Frequency Division Multiplexing (OFDM) system is the higher Peak-to-Average Power Ratio (PAPR) of the OFDM signals at the transmitter side. Companding is a well-known technique useful for reducing PAPR in the OFDM signal. This paper proposes a new nonlinear companding scheme that transforms the magnitude of Rayleigh distributed OFDM signal of specific degree into trapezoidal distribution. Additional design parameter is used in the proposed companding scheme to make the companding function more flexible. In the designed OFDM system the companding function has more degree of freedom which improves the PAPR and bit error rate (BER) parameters of the designed system. It has been demonstrated that the designed companding scheme provides more flexibility to accomplish an optimum trade-off between the performance parameters PAPR and BER of the designed OFDM system.

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