Showing papers by "Seung-Jean Kim published in 2003"
15 Sep 2003
TL;DR: In this paper, the authors define a rate maximization power allocation game in a frequency selective Gaus-Sian interference channel, after assuming a suboptimal but pragmatic multi-user coding scheme, and provide a sufficient condition for the convergence of the distributed algorithm.
Abstract: This paper defines a rate maximization power allocation game in a frequency selective Gaus- sian interference channel, after assuming a suboptimal but pragmatic multi-user coding scheme. We show that the Nash equilibrium always exists in this game. We consider a distributed power allocation scheme (l, Section IV.), and provide a sufficient condition for the convergence of the distributed algorithm. The condi- tion for the convergence is also a sufficient condition under which the Nash equilibrium is unique. I. PROBLEM FORMULATION
176 citations
06 Apr 2003
TL;DR: A new pitch tracking method based on a time delay estimation technique and an adaptive frame length iteration stage is described, avoiding inaccuracies that could come from pitch doubling and jitter.
Abstract: We describe a new pitch tracking method based on a time delay estimation technique and we incorporate an adaptive frame length iteration stage. Given two frames of voiced speech and the time delay between them, we run a linear regression on the unwrapped phase of the quotient of the spectrum of both frames. A weighted linear regression allows us to avoid the effect of phases corrupted by spectral leakage and noise. Iterations adapting the frame length allow us to have better time resolution, less spectral leakage and more noise robustness, avoiding inaccuracies that could come from pitch doubling and jitter.
2 citations