Distortion-Power Tradeoffs in Quasi-Stationary Source Transmission over Delay and Buffer Limited Block Fading Channels

Roghayeh Joda, Farshad Lahouti, Elza Erkip

Research output: Contribution to journalArticle

Abstract

This paper investigates distortion-power tradeoffs in transmission of quasi-stationary sources over delay and buffer limited block fading channels by studying encoder and decoder buffering techniques to smooth out the source and channel variations. Four source and channel coding schemes that consider buffer and power constraints are presented to minimize the reconstructed source distortion. The first one is a high performance scheme, which benefits from optimized source and channel rate adaptation. In the second scheme, the channel coding rate is fixed and optimized along with transmission power with respect to channel and source variations; hence this scheme enjoys simplicity of implementation. The two last schemes have fixed transmission power with optimized adaptive or fixed channel coding rate. For all the proposed schemes, closed form solutions for mean distortion, optimized rate, and power are provided and in the high SNR regime, the mean distortion exponent and the asymptotic mean power gains are derived. The proposed schemes with buffering exploit the diversity due to source and channel variations. Specifically, when the buffer size is limited, fixed channel rate adaptive power scheme outperforms an adaptive rate fixed power scheme. Furthermore, analytical and numerical results demonstrate that with limited buffer size, the system performance in terms of reconstructed signal SNR saturates as transmission power increases, suggesting that appropriate buffer size selection is important to achieve a desired reconstruction quality.

Original languageEnglish (US)
Article number7438926
Pages (from-to)4505-4520
Number of pages16
JournalIEEE Transactions on Wireless Communications
Volume15
Issue number7
DOIs
StatePublished - Jul 1 2016

Fingerprint

Fading Channels
Fading channels
Channel coding
Buffer
Trade-offs
Power transmission
Channel Coding
Rate Adaptation
Power Mean
Source Coding
Rate-distortion
Encoder
Closed-form Solution
System Performance
Simplicity
High Performance
Exponent
Minimise
Numerical Results

Keywords

  • Mean distortion
  • outage capacity
  • quasi-stationary source

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

Distortion-Power Tradeoffs in Quasi-Stationary Source Transmission over Delay and Buffer Limited Block Fading Channels. / Joda, Roghayeh; Lahouti, Farshad; Erkip, Elza.

In: IEEE Transactions on Wireless Communications, Vol. 15, No. 7, 7438926, 01.07.2016, p. 4505-4520.

Research output: Contribution to journalArticle

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