How will we rate telecommunications system performance?

Wolf, Stephen; Dvorak, Charles A.; Kubichek, Robert F.; South, C.R.; Schaphorst, Richard; Voran, S.

doi:10.1109/35.99258

Cited by 15 publications

(3 citation statements)

References 5 publications

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“…Perceptual speech quality measurements have been studied in the past. Both subjective and objective measurements are available [44]. Subjective measurements are obtained from a group of people who rate the quality of the speech after listening to the original and received speech.…”

Section: Measures After Speech or Videomentioning

confidence: 99%

Real-Time Measurements for Adaptive and Cognitive Radio Systems

Arslan

Yarkan

2009

J Wireless Com Network

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Adaptive and cognitive radios (CR) have been becoming popular for optimizing mobile radio system transmission and reception. One of the most important elements of the adaptive radio and CR concepts is the ability to measure, sense, learn about, and be aware of parameters related to the radio channel characteristics, availability of spectrum and power, interference and noise temperature, operational environment of radio, user requirements and applications, available networks and infrastructures, local policies, other operating restrictions, and so on. This paper discusses some of the important measurement parameters for enabling adaptive radio and CR systems along with their relationships and impacts on the performance including relevant challenges.

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Section: Measures After Speech or Videomentioning

confidence: 99%

Real-Time Measurements for Adaptive and Cognitive Radio Systems

Arslan

Yarkan

2009

J Wireless Com Network

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“…Furthermore the packetisation and compression of signals introduce non-lineanties into the system which may display unexpected interac-tions when interconnected with other networks. Such interconnections and the deregulation of the telecommunications market place are the root cause of the quality risk [2] and dictate more accurate live assessment.…”

Section: Introductionmentioning

confidence: 99%

Letter: Optimal echo path modelling using chaotic modulated speech

Milner

Elmirghani

Cryan

1996

Trans Emerging Tel Tech

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Abstract.A novel modulating scheme is presented that allows optimal echo path modelling using. real time least mean square (LMS) system identification techniques. The systems of interest are usually based on a class of digital adaptive filters (DAFs). The modelling convergence rate derived from the optimal Wiener weights defines the performance criterion. A novel chaotic based modulation regime utilising the logistic mapping is exploited to whiten the speech power spectral density (PSD) whilst preserving the signal bandwidth requirements. The whitened signal optimises the convergence rate and allows adaptation times to be calculated without a-priori knowledge of the speech signal's second order statistics. Software simulations are reported for an ensemble of conversational speech realisations and it is shown that the described modulation scheme significantly improves the convergence rate and guarantees optimal modelling independent of the input speech signal statistics. Furthermore, the noise whitened input signal circumvents controllsupervisory problems usually associated with uncoded speech inputs.

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“…Often, there is no practical way for describing these components in a uniform manner. As a result, the simulation of various aspects of ATM networks in one single model will be a very challenging task [3].…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of an object-oriented ATM network simulator

Chen

Lin

Chen

Proceedings of MASCOTS '96 - 4th International Workshop on Modeling, Analysis and Simulation of Computer and Telecommunication

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Asynchronous Transfer Mode flw) is considered to be the ground on which B-ISDN is to be built. Understanding an ATM network before it is built is a challenging task as one must consider the design of the switch architecture, call processing, and signal processing subsystems at the same time. These components, already posing challenge for individual analysis, interact in complex ways. Libra is an object-oriented simulator developed for simulation and fast prototyping of A W networks. It is designed and implemented to address the diverse issues encountered in the simulation of any large-scale ATM network.In this paper, we discuss the unique features of Libra that makes it feasible for simulation of A W networks and present the design and implementation issues of such a simulator. An example is also given to illustrate the application of Libra.

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How will we rate telecommunications system performance?

Cited by 15 publications

References 5 publications

Real-Time Measurements for Adaptive and Cognitive Radio Systems

Real-Time Measurements for Adaptive and Cognitive Radio Systems

Letter: Optimal echo path modelling using chaotic modulated speech

Design and implementation of an object-oriented ATM network simulator

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