This book covers the principles of modeling and simulation of nonlinear distortion in wireless communication systems with MATLAB® simulations and techniquesIn this book, the author describes the ...principles of modeling and simulation of nonlinear distortion in single and multichannel wireless communication systems using both deterministic and stochastic signals. Models and simulation methods of nonlinear amplifiers explain in detail how to analyze and evaluate the performance of data communication links under nonlinear amplification. The book addresses the analysis of nonlinear systems with stochastic inputs and establishes the performance metrics of communication systems with regard to nonlinearity. In addition, the author also discusses the problem of how to embed models of distortion in system-level simulators such as MATLAB®and MATLAB Simulink®and provides practical techniques that professionals can use on their own projects. Finally, the book explores simulation and programming issues and provides a comprehensive reference of simulation tools for nonlinearity in wireless communication systems.Key Features:Covers the theory, models and simulation tools needed for understanding nonlinearity and nonlinear distortion in wireless systemsPresents simulation and modeling techniques for nonlinear distortion in wireless channels using MATLAB®Uses random process theory to develop simulation tools for predicting nonlinear system performance with real-world wireless communication signalsFocuses on simulation examples of real-world communication systems under nonlinearityIncludes an accompanying website containing MATLAB® codeThis book will be an invaluable reference for researchers, RF engineers, and communication system engineers working in the field. Graduate students and professors undertaking related courses will also find the book of interest.
An increased sense of job performance and better job satisfaction can be achieved by receiving social support. In order to fulfil this purpose, this study aimed to determine the relationship between ...social support on the one hand and job performance and job satisfaction on the other hand for the Jordanian insurance industry employees. Survey data were gathered from 269 employees from the Jordanian insurance industry. The PLS 3.0 software was used to process data using the structural equation modelling method. The study’s findings revealed that all social support factors were positively and significantly related to job performance and job satisfaction, including manager support, peer support, friends support, and others’ support. Hence, job performance and job satisfaction in the Jordanian insurance industry can be predicted by studying the existence of social support. The study’s findings concluded that the higher the social support, the higher the job performance and job satisfaction.
This paper aims to study the performance of support vector machine (SVM) classification in detecting asthma attacks in a wireless remote monitoring scenario. The effect of wireless channels on ...decision making of the SVM classifier is studied in order to determine the channel conditions under which transmission is not recommended from a clinical point of view. The simulation results show that the performance of the SVM classification algorithm in detecting asthma attacks is highly influenced by the mobility of the user where Doppler effects are manifested. The results also show that SVM classifiers outperform other methods used for classification of cough signals such as the hidden markov model (HMM) based classifier specially when wireless channel impairments are considered.
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FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBMB, UL, UM, UPUK
The objective of this study is to identify the competencies required to achieve success in the transition from higher education to the labour market based on the perceptions of employers. This paper ...analyses the assessments made by a group of engineering company employers. An item-battery of 20 competencies was grouped into 3 dimensions by using factor analysis. Subsequently, respondents' scores were also clustered into three groups and characterised through contingency tables. The competencies demanded by employers were grouped into business and finance, problem-solving and strategic planning. Significant differences were found between responses from employers working in medium and small companies, who placed more importance on competencies related to problem-solving and strategic planning, and employers in big companies, who were more concerned about the difficulties of finding well-trained graduates. The findings from this paper have important implications for research in the areas of higher education and organisations that usually employ graduate engineers.
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A formulation of the noise-to-power ratio (NPR) using the orthogonalization of the nonlinear model is performed. The analysis (coupled with simulations) is used to study the applicability of the NPR ...as a measure of in-band nonlinear distortion in wide band code division multiple access (WCDMA) systems. Simulated NPR of WCDMA signals is compared to that of narrow band Gaussian noise (NBGN) where it is shown that NPR using NBGN overestimates in-band distortion of WCDMA signals.
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Nonlinear amplification in wireless systems results in in-band distortion which degrades system performance. The effect of nonlinear distortion is more severe in multiple-input multiple-output (MIMO) ...systems because signal encoding at the transmitter (such as transmitter precoding in singular value decomposition (SVD)-based MIMO) results in signals with higher peak-to-average ratio (PAPR) than single-input single-output (SISO) systems. In this paper, the effect of nonlinear amplification on the performance of a MIMO system is analyzed. The performance analysis is based on relating in-band distortion to system BER of a M-QAM modulated signals transmitted over a MIMO Rayleigh fading channel. It is shown that transmitter precoding results in increased in-band distortion and hence, increased system BER over the case when no precoding is used. The results presented in this paper can be used to derive limit of nonlinearity which allow energy efficient MIMO systems.
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