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The goal of this paper is to present an innovative QoS solution of managing resources by knowing the service requests and the network context in a unified network architecture. Considering the nowadays technical solutions and the holistic vision of the future network of information, this solution is proposing a cognitive QoS model of self-managing resources by using the network virtualization concept...
The IEEE 802.11 legacy standard could not offer QoS support for time-critical applications. Considerable research efforts on medium access control (MAC) layer have been carried out important enhancements on improving QoS for IEEE 802.11 device implemented standard. Among them, IEEE 802.11e standard is the QoS enhanced proposed by the IEEE. The contention based channel access method called enhanced...
Our evaluation is performed in the context of a study of adaptive radio techniques, in the attempt to improve link availability and transmission quality of BWA (broadband wireless access) systems, and to achieve an efficient use of radio resources. As part of an evaluation of coexistence issues in the under-11 GHz bands, we have analysed several adaptive techniques currently in use in IEEE 802.16...
Our analysis is performed in the context of a study of adaptive radio techniques, in the attempt to improve link availability and transmission quality of broadband wireless systems, and to achieve an efficient use of radio resources. We have implemented and analysed the IEEE 802.16 a WirelessMAN-SCa PHY. The paper is focused on the BER performance of the 802.16 a FEC (forward error correction) block...
In this paper we present a novel method for silence/unvoiced/voiced (SUV) classification of speech signals. The well-known algorithm for locating endpoints in an utterance, based on zero-crossing rate and energy, was our starting point. We added a few supplementary decision criteria to it and we tested it using features like Teager energy and entropy. The experiments that we performed showed that...
For the next generation technologies, mobility is more than a necessity, it's a requirement. Actual developed architectures dedicate a special attention to this aspect. Considering that, this paper analyzes the aspect reflecting the network capability, named mobility. We test and verify the mobile nodes availability to roam in different scenarios, for computer networks and cellular networks. All simulations...
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