| Paper: | SPCOM-P3.3 | ||
| Session: | Joint Source/Channel Coding and Quantization | ||
| Time: | Wednesday, May 19, 09:30 - 11:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Joint Source-Channel Coding | ||
| Title: | ENTROPY CONSTRAINED MULTIPLE DESCRIPTION LATTICE VECTOR QUANTIZATION | ||
| Authors: | Jan Østergaard; Delft University of Technology | ||
| Jesper Jensen; Delft University of Technology | |||
| Richard Heusdens; Delft University of Technology | |||
| Abstract: | Recently, lattice vector quantizers (LVQ) capable of performing close to known information theoretic bounds were introduced in the area of multiple description coding (MDC). In this paper we derive analytical expressions for the central and side quantizers which minimize the expected distortion of an LVQ subject to entropy constraints on the side descriptions for given packet loss probabilities. We show that for certain packet loss probabilities, an optimal LVQ for single descriptions might not be optimal for multiple descriptions. Specifically, we show that the $Z^2$ lattice performs better than the $A_2$ lattice in some cases. Moreover, our results suggest a practical way of determining which lattice quantizers are optimal for given packet loss probabilities. | ||
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