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

Joda, Roghayeh and Lahouti, Farshad and Erkip, Elza (2016) Distortion-Power Trade-Offs in Quasi-Stationary Source Transmission over Delay and Buffer Limited Block Fading Channels. IEEE Transactions on Wireless Communications, 15 (7). pp. 4505-4520. ISSN 1536-1276. doi:10.1109/TWC.2016.2542129.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Joda, Roghayeh0000-0002-1273-8067
Lahouti, Farshad0000-0002-8729-873X
Erkip, Elza0000-0001-8718-8648
Additional Information:© 2016 IEEE. Manuscript received April 23, 2015; revised October 4, 2015 and January 26, 2016; accepted February 23, 2016. Date of publication March 22, 2016; date of current version July 8, 2016.
Subject Keywords:Mean distortion, outage capacity, quasi-stationary source
Issue or Number:7
Record Number:CaltechAUTHORS:20160915-135408691
Persistent URL:
Official Citation:R. Joda, F. Lahouti and E. Erkip, "Distortion-Power Tradeoffs in Quasi-Stationary Source Transmission Over Delay and Buffer Limited Block Fading Channels," in IEEE Transactions on Wireless Communications, vol. 15, no. 7, pp. 4505-4520, July 2016. doi: 10.1109/TWC.2016.2542129 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70379
Deposited By: Tony Diaz
Deposited On:22 Sep 2016 19:33
Last Modified:11 Nov 2021 04:28

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