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Flexible Symmetric Multiple Description Lattice Vector Quantizer With - Descriptions | IEEE Journals & Magazine | IEEE Xplore

Flexible Symmetric Multiple Description Lattice Vector Quantizer With L\geq 3 Descriptions

Publisher: IEEE

Abstract:

In the previous work on multiple description lattice vector quantizers (MDLVQs) with L ≥ 3 descriptions, once the central and side lattice codebooks are fixed, the decodi...View more

Abstract:

In the previous work on multiple description lattice vector quantizers (MDLVQs) with L ≥ 3 descriptions, once the central and side lattice codebooks are fixed, the decoding quality is determined for all numbers k of received descriptions. Therefore, it is not possible to achieve tradeoffs between the quality of reconstruction for different values of k, 1 k ≤ L - 1. This paper proposes a flexible MDLVQ capable of overcoming the above drawback. For this, a different reconstruction method is employed and a heuristic index assignment (IA) algorithm, which uses L - 2 parameters to control the distortions for 2 k ≤ L - 1, is developed. Experimental results show that the proposed MDLVQ, in addition to achieving the desired tradeoffs, significantly outperforms the classic MD scheme based on unequal erasure protection. The second contribution of this paper is a structured IA for the case of L = 3 and the derivation of the corresponding expressions of the distortions at high resolution. The proposed IA has a simple mechanism for controlling the tradeoff between the reconstruction quality for k = 1, 2. The IA is able to achieve a wide range of distortion values, while keeping the product of the distortions for k = 1, 2 the same as in the prior work.
Published in: IEEE Transactions on Communications ( Volume: 62, Issue: 12, December 2014)
Page(s): 4281 - 4292
Date of Publication: 06 November 2014

ISSN Information:

Publisher: IEEE

I. Introduction

A MULTIPLE description (MD) coder consists of encoders for some , each encoder generating a separate description of the signal. Each description is sent to the destination over a separate channel, which either transmits the whole description correctly or breaks down. The decoder is able to reconstruct the source to some quality from any subset of received descriptions, while the fidelity of the reconstruction generally increases with the number of received descriptions.

References

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