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The advent of various real-time multimedia applications in high-speed networks creates a need for quality of service (QoS) based multicast routing. Two important QoS constraints are the bandwidth constraint and the end-to-end delay constraint. The QoS based multicast routing problem is a known NP-complete problem that depends on (1) bounded end-to-end delay and link bandwidth along the paths from...
To combat the effect of intersymbol interference caused by frequency selectivity of fading channel in space time coding schemes, two main methods are employed, i.e. multichannel equalization and orthogonal frequency division multiplexing. The complexity of the multichannel equalization method restricts its use widely. Orthogonal frequency division multiplexing (OFDM) converts the frequency selective...
In dual-frame video coding, both encoder and decoder store a short-term reference (STR) and a long-term reference (LTR) frame for motion compensation. In past work, LTR frames at regular intervals were assigned higher quality than the other frames to improve overall video quality. In this letter, we present a method of LTR frame selection using simulated annealing, and we show that PSNR is improved...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
The authors propose an efficient vector quantization scheme and a novel linear predictive coding (LPC) analysis scheme, both of which exploit interframe correlation in the successive spectrum envelope of speech signals. The first quantization scheme proposed is a multistage vector quantization of line spectrum pair (LSP) parameters with a partially adaptive codebook (MSVQ-AC). The second algorithm...
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