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Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
The presence of background noise degrades the quality of speech signal. The speech quality of the VoIP system can be improved by reducing the background noise, codec distortion and various network impairments such as packet loss, delay and jitter. The work in this paper proposes the Interpolated Finite Impulse Response filter (IFIR) based scheme for reduction of noise. The IFIR filter would be applied...
In voice over internet protocol (VoIP) system, the speech signal is degraded when passed through the network layers. The speech signal is processed through best effort policy based IP network, which include delay, packet loss and jitter network problems. The quality of VoIP speech signal can be improved by filtering the degraded VoIP speech signal through multirate filters. The work in this paper...
The transmission of Voice over Internet protocol requires signal processing for reliable & efficient performance over the computer and the communication platform. Speech quality, as perceived by the users of VoIP telephony, is critically important to the update of the service. Signal quality is degraded by network layer problems including delay, jitter and packet loss. The work presented in this...
Because of its wide bandgap, silicon carbide is attractive for applications in harsh environments, especially high temperature applications. Thermal generation currents are negligible in SiC, even at high temperatures, and the intrinsic temperature of SiC is above 900??C. As a result, the upper temperature of SiC devices is limited by the stability of the associated metallurgy or dielectrics, rather...
In the design of wireless networking protocols and systems, simulation has become the primary form of initial validation and performance evaluation. Hence, ensuring the realism of simulators and simulation methods is fundamental for simulated results to be interpretable. In this paper, we provide a simulation framework for infrastructure wireless network traffic that allows researchers to use publicly...
Track maintenance policies have traditionally been looked on as engineering led decisions. Maintenance actions have been typically based on use of exceedence thresholds each measurement is compared against a preset threshold such that if it exceeds the threshold then maintenance is done. This paper make two significant contribution one explaining various track geometry parameters in UK rail industry...
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