Nenad Mijatovic - Academia.edu (original) (raw)
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Papers by Nenad Mijatovic
European Journal of Engineering Education, 2012
This paper describes a teaching method used in an electrical machines course, where the students ... more This paper describes a teaching method used in an electrical machines course, where the students learn about electrical machines by designing them. The aim of the course is not to teach design, albeit this is a side product, but rather to teach the fundamentals and the function of electrical machines through design. The teaching method is evaluated by a student questionnaire, designed to measure the quality and effectiveness of the teaching method. The results of the questionnaire conclusively show that this method labelled ‘learning through design’ is a very effective way of teaching a components-based course. This teaching method can easily be generalised and used in other courses.
ABSTRACT A quality of service (QoS) assessment methodology for cellular communication networks is... more ABSTRACT A quality of service (QoS) assessment methodology for cellular communication networks is described. The methodology is based on the data collected through drive testing; it is focused on the end user perception of service quality and it is independent of access technologies implemented by the cellular networks. QoS assessment for both the circuit switched and packet switched side of the network is discussed. The end goal of the proposed methodology is QoS comparison between cellular networks implementing different cellular technologies. Illustrative examples based on live network measurements are used in support of the presented methodology.
Received signal level (RSL) measurements are frequently used to verify coverage and ensure qualit... more Received signal level (RSL) measurements are frequently used to verify coverage and ensure quality of service in cellular communication networks. To accomplish these tasks, it is of the utmost importance that these measurements are reliable and repeatable. This paper presents a repeatability study conducted on a series of RSL measurements in the GSM 1900MHz frequency band. The measurements were collected with three different drive-test systems used in common engineering practice. Data obtained from the tests are analyzed using statistical tools and the extent of the RSL measurement repeatability is determined. The analysis provides a quantitative assessment of the RSL dependence on random changes in the propagation environment. Data analysis demonstrates a significant repeatability difference between the measurement systems
Propagation model tuning is a fundamental part of everyday GSM cellular engineering practice. The... more Propagation model tuning is a fundamental part of everyday GSM cellular engineering practice. The model tuning is usually accomplished through elaborate and costly tests based on CW measurements. This paper evaluates alternatives to CW testing where measurements are collected using GSM scanners and GSM high dynamic range receivers. The results of the analysis reveal that GSM receivers provide a viable alternative for CW tests in many practical situations. On the other hand, use of GSM scanners is affected by the co-channel and adjacent channel interference and therefore it is limited to cases of relatively low frequency reuse.
The received signal level (RSL) is one of the fundamental measurements performed in cellular syst... more The received signal level (RSL) is one of the fundamental measurements performed in cellular system operation and maintenance. Network RF optimization, coverage verification, and quality of service estimation rely on RSL measurements collected from the field using one of commercially available drive testing systems. This paper presents a comparative study of a series of RSL measurements in the GSM 1900 MHz frequency band. The measurements were collected with three different drive test systems used in common engineering practice. Data analysis shows significant difference between the measurement systems. The differences were observed both in the size of the area from which the measurements may be collected as well as in the actual measured values. Computer simulation and theoretical analysis were used to verify the result of the measurements and extrapolate their validity to a set of more general cases.
European Journal of Engineering Education, 2012
This paper describes a teaching method used in an electrical machines course, where the students ... more This paper describes a teaching method used in an electrical machines course, where the students learn about electrical machines by designing them. The aim of the course is not to teach design, albeit this is a side product, but rather to teach the fundamentals and the function of electrical machines through design. The teaching method is evaluated by a student questionnaire, designed to measure the quality and effectiveness of the teaching method. The results of the questionnaire conclusively show that this method labelled ‘learning through design’ is a very effective way of teaching a components-based course. This teaching method can easily be generalised and used in other courses.
ABSTRACT A quality of service (QoS) assessment methodology for cellular communication networks is... more ABSTRACT A quality of service (QoS) assessment methodology for cellular communication networks is described. The methodology is based on the data collected through drive testing; it is focused on the end user perception of service quality and it is independent of access technologies implemented by the cellular networks. QoS assessment for both the circuit switched and packet switched side of the network is discussed. The end goal of the proposed methodology is QoS comparison between cellular networks implementing different cellular technologies. Illustrative examples based on live network measurements are used in support of the presented methodology.
Received signal level (RSL) measurements are frequently used to verify coverage and ensure qualit... more Received signal level (RSL) measurements are frequently used to verify coverage and ensure quality of service in cellular communication networks. To accomplish these tasks, it is of the utmost importance that these measurements are reliable and repeatable. This paper presents a repeatability study conducted on a series of RSL measurements in the GSM 1900MHz frequency band. The measurements were collected with three different drive-test systems used in common engineering practice. Data obtained from the tests are analyzed using statistical tools and the extent of the RSL measurement repeatability is determined. The analysis provides a quantitative assessment of the RSL dependence on random changes in the propagation environment. Data analysis demonstrates a significant repeatability difference between the measurement systems
Propagation model tuning is a fundamental part of everyday GSM cellular engineering practice. The... more Propagation model tuning is a fundamental part of everyday GSM cellular engineering practice. The model tuning is usually accomplished through elaborate and costly tests based on CW measurements. This paper evaluates alternatives to CW testing where measurements are collected using GSM scanners and GSM high dynamic range receivers. The results of the analysis reveal that GSM receivers provide a viable alternative for CW tests in many practical situations. On the other hand, use of GSM scanners is affected by the co-channel and adjacent channel interference and therefore it is limited to cases of relatively low frequency reuse.
The received signal level (RSL) is one of the fundamental measurements performed in cellular syst... more The received signal level (RSL) is one of the fundamental measurements performed in cellular system operation and maintenance. Network RF optimization, coverage verification, and quality of service estimation rely on RSL measurements collected from the field using one of commercially available drive testing systems. This paper presents a comparative study of a series of RSL measurements in the GSM 1900 MHz frequency band. The measurements were collected with three different drive test systems used in common engineering practice. Data analysis shows significant difference between the measurement systems. The differences were observed both in the size of the area from which the measurements may be collected as well as in the actual measured values. Computer simulation and theoretical analysis were used to verify the result of the measurements and extrapolate their validity to a set of more general cases.