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Message authentication that ensures a message is genuine and verifies the source of the sender is a key issue in vehicular ad hoc networks (VANETs). Because messages may provide life-critical traffic information or emergency messages transmitted by unfamiliar sources. Because the vehicle in a VANET transmits messages in real-time in a high-mobility(More)
In this paper, a robust voice activity detection (VAD) algorithm based on the perceptual wavelet packet transform (PWPT) is proposed. The first step of this new VAD algorithm is to make use of the PWPT to decompose the input speech into 17 critical subband signals. To enhance energy of voice frames and decay energy of unvoice frames, the voice activity(More)
Vehicular ad hoc networks (VANETs) have been the focus of considerable recent research, allowing vehicles to broadcast messages to other vehicles and inform drivers regarding immediate route changes that can improve driving efficiency or avoid accidents. Because vehicles communicate using wireless channels, malicious attacks may occur during the(More)
VANET is a vehicular ad hoc network. This is a part of mobile ad hoc network. VANETs also called as intelligent transportation system (ITS) in which vehicles communicate to provide timely information. Their aim is to provide security, information and management of network. Instead of their many advantages vehicular network is prone to various attacks. Like(More)
This paper proposed a fast algorithm for computing the line spectrum pairs (LSP) parameters that are widely used in speech coding systems. The first step of the proposed algorithm is to derive a quartic equation from the 1st derivative of the given 5-degree LSP polynomial. Then the approximate extremes of the 5-degree LSP polynomial can be found by applying(More)
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