Multiple Description Coding for Closed Loop Systems over Erasure Channels

In this paper, we consider robust source coding in closed-loop systems. In particular, we consider a (possibly) unstable LTI system, which is to be stabilized via a network. The network has random delays and erasures on the data-rate limited (digital) forward channel between the encoder (controller)...

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Vydáno v:2013 Data Compression Conference s. 311 - 320
Hlavní autoři: Ostergaard, J., Quevedo, D. E.
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.03.2013
Témata:
Decoding
Delays
Encoding
Joints
Markov jump linear systems
Multiple Description Coding
Out of order
Quantization
Quantization (signal)
stability
Vectors
ISBN:9781467360371, 1467360376
ISSN:1068-0314
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Abstract In this paper, we consider robust source coding in closed-loop systems. In particular, we consider a (possibly) unstable LTI system, which is to be stabilized via a network. The network has random delays and erasures on the data-rate limited (digital) forward channel between the encoder (controller) and the decoder (plant). The feedback channel from the decoder to the encoder is assumed noiseless. Since the forward channel is digital, we need to employ quantization. We combine two techniques to enhance the reliability of the system. First, in order to guarantee that the system remains stable during packet dropouts and delays, we transmit quantized control vectors containing current control values for the decoder as well as future predicted control values. Second, we utilize multiple description coding based on forward error correction codes to further aid in the robustness towards packet erasures. In particular, we transmit M redundant packets, which are constructed such that when receiving any J packets, the current control signal as well as J-1 future control signals can be reliably reconstructed at the decoder. We prove stability subject to quantization constraints, random dropouts, and delays by showing that the system can be cast as a Markov jump linear system.
AbstractList In this paper, we consider robust source coding in closed-loop systems. In particular, we consider a (possibly) unstable LTI system, which is to be stabilized via a network. The network has random delays and erasures on the data-rate limited (digital) forward channel between the encoder (controller) and the decoder (plant). The feedback channel from the decoder to the encoder is assumed noiseless. Since the forward channel is digital, we need to employ quantization. We combine two techniques to enhance the reliability of the system. First, in order to guarantee that the system remains stable during packet dropouts and delays, we transmit quantized control vectors containing current control values for the decoder as well as future predicted control values. Second, we utilize multiple description coding based on forward error correction codes to further aid in the robustness towards packet erasures. In particular, we transmit M redundant packets, which are constructed such that when receiving any J packets, the current control signal as well as J-1 future control signals can be reliably reconstructed at the decoder. We prove stability subject to quantization constraints, random dropouts, and delays by showing that the system can be cast as a Markov jump linear system.
Author Ostergaard, J.
Quevedo, D. E.
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  givenname: D. E.
  surname: Quevedo
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  email: dquevedo@ieee.org
  organization: Sch. of Electr. Eng. & Comput. Sci., Univ. of Newcastle, Newcastle, NSW, Australia
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Snippet In this paper, we consider robust source coding in closed-loop systems. In particular, we consider a (possibly) unstable LTI system, which is to be stabilized...
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StartPage 311
SubjectTerms Decoding
Delays
Encoding
Joints
Markov jump linear systems
Multiple Description Coding
Out of order
Quantization
Quantization (signal)
stability
Vectors
Title Multiple Description Coding for Closed Loop Systems over Erasure Channels
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