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Bounding the Rate Region of Vector Gaussian Multiple Descriptions with Individual and Central Receivers
KTH, School of Electrical Engineering (EES), Sound and Image Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Sound and Image Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Sound and Image Processing.
2010 (English)In: Data Compression Conference Proceedings, 2010, 13-19 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we study the rate region of the vector Gaussian multipledescription problem with individual and central quadratic distortion con-straints. In particular, we derive an outer bound to the rate region of theL-description problem. The bound is obtained by lower bounding a weightedsum rate for each supporting hyperplane of the rate region. The key ideais to introduce at most L-1 auxiliary random variables and further imposeupon the variables a Markov structure according to the ordering of the de-scription weights. This makes it possible to greatly simplify the derivationof the outer bound. In the scalar Gaussian case, the complete rate regionis fully characterized by showing that the outer bound is tight. In this case,the optimal weighted sum rate for each supporting hyperplane is obtained bysolving a single maximization problem. This contrasts with existing results,which require solving a min-max optimization problem.

Place, publisher, year, edition, pages
2010. 13-19 p.
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-24221DOI: 10.1109/DCC.2010.9Scopus ID: 2-s2.0-77952716951OAI: oai:DiVA.org:kth-24221DiVA: diva2:345505
Conference
Data Compression Conference, DCC 2010; Snowbird, UT; 24 March 2010 through 26 March 2010
Note

QC20100830

Available from: 2010-08-25 Created: 2010-08-25 Last updated: 2013-04-11Bibliographically approved
In thesis
1. Robust Multimedia Communications over Packet Networks
Open this publication in new window or tab >>Robust Multimedia Communications over Packet Networks
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Multimedia communications over packet networks, and in particular the voice over IP (VoIP) application, have become an integral part of society. However, the unreliable and heterogeneous nature of packet networks has led to a best-effort delivery of services. Delay, limitation of bandwidth, and packet-loss rate all affect the quality of service (QoS). In this thesis, we address two important network impairments in the design of robust multimedia communication systems: packet delay-variation and packet-loss.

Paper A considers the mitigation of the effect of packet delay-variation for audio communications by introducing a buffer at the receiver side. A new adaptive playout scheduling approach is proposed to control the buffering length, or, equivalently, the packet playout deadlines, in response to varying network conditions. A Wiener process is used to model the fluctuation of the buffering length without any playout adjustment. The playout scheduling problem is then reformulated as a stochastic impulse control problem by taking the playout adjustment as the control signal. The proposed approach is shown to be the optimal solution to the new control problem. It is demonstrated experimentally that the proposed approach provides improved perceived conversional quality.

Papers B, C and D address the packet-loss issue. Paper B focuses on the design of a low-complexity packet-loss concealment (PLC) method that is compatible with existing speech codecs for VoIP application. The new method is rigorously motivated based on the autoregressive (AR) speech model and the minimum mean squared error (MMSE) criterion. The effect of model estimation error on the prediction of the missing speech segment is also considered and an upper bound for the prediction error is derived. Both the theoretical and experimental results provide insight in the performance of the heuristically designed PLC methods. On the other hand, Paper C and D consider an active packet-loss-resilient coding scheme, namely multiple description coding (MDC). In general, MDC can be used for the transmission of any media data. Paper C derives a simple and accurate approximation of the rate-distortion lower bound of a particular multiple- description scenario and then demonstrates that the performance loss of some practical MD systems can be evaluated easily with the new approximation. Paper D studies the performance limit of a vector Gaussian multiple description scenario. An outer bound to the rate-distortion region is derived, and the outer bound is tight when the problem specializes to the scalar Gaussian case.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. xii, 37 p.
Series
Trita-EE, ISSN 1653-5146 ; 2010:036
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-24223 (URN)
Public defence
2010-08-30, Salongen, KTHB, Osquars backe 25, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC20100830Available from: 2010-08-30 Created: 2010-08-25 Last updated: 2010-08-31Bibliographically approved

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