Real-time communication systems based on taut strings

We consider buffered real-time communication over channels with time-dependent capacities which are known in advance. The real-time constraint is imposed in terms of limited transmission time between sender and receiver. For a network consisting of a single channel it is shown that there is a coding...

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Vydáno v:Journal of communications and networks Ročník 20; číslo 2; s. 207 - 218
Hlavní autoři: Setterqvist, Eric, Forchheimer, Robert
Médium: Journal Article
Jazyk:angličtina
Vydáno: Seoul Editorial Department of Journal of Communications and Networks 01.04.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
한국통신학회
Témata:
Buffers
Channel capacity
Channels
Coding
Communications systems
Distortion
Encoding
Real time
Real-time systems
Receivers
source coding
Strategy
Streaming media
Strings
taut string
Time dependence
전자/정보통신공학
source coding
Buffers
taut string
real-time systems
distortion
ISSN:1229-2370, 1976-5541, 1976-5541
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Popis
Shrnutí:We consider buffered real-time communication over channels with time-dependent capacities which are known in advance. The real-time constraint is imposed in terms of limited transmission time between sender and receiver. For a network consisting of a single channel it is shown that there is a coding rate strategy, geometrically characterized as a taut string, which minimizes the average distortion with respect to all convex distortion-rate functions. Utilizing the taut string characterization further, an algorithm that computes the optimal coding rate strategy is provided. We then consider more general networks with several connected channels in parallel or series with intermediate buffers. It is shown that also for these networks there is a coding rate strategy, geometrically characterized as a taut string, which minimizes the average distortion with respect to all convex distortion-rate functions. The optimal offline strategy provides a benchmark for the evaluation of different coding rate strategies. Further, it guides us in the construction of a simple but rather efficient strategy for channels in the online setting which alternates between a good and a bad state.
Bibliografie:ObjectType-Article-1
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ISSN:1229-2370
1976-5541
1976-5541
DOI:10.1109/JCN.2018.000027