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We investigate noise reduction (NR) for speech signals for automatic speech recognition (ASR). We compare four transform based noise reduction algorithms according to their influence on ASR performance. These include frequency domain based algorithms using the discrete Fourier transform (DFT), the fast chirp transform (FCT), and the discrete wavelet transform (DWT), as well as a lattice filter based...
In this paper we conduct a delay analysis of IEEE 802.16 wireless metropolitan area network. In particular, we address the overall message delay, which consists of the reservation and scheduling components. Unicast polling is used for bandwidth reservation and round-robin scheduling is applied at the base station. A discrete-time analytical model is developed with general independent and identically...
In this paper we present the delay analysis of IEEE 802.16 broadband wireless access network. We assume that the system operates in point-to-multipoint mode with TDD/TDMA scheme. The developed analytical model is used to evaluate the delay-load characteristic. It considers the overall delay including both the contention-free reservation and the scheduling delay and establishes a precise upper bound...
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