Gaussian HDA coding with bandwidth expansion and side information at the decoder

Koken, Erman; Tuncel, Ertem

doi:10.1109/isit.2013.6620178

Cited by 6 publications

(8 citation statements)

References 9 publications

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“…HDA-WZ-BE was previously proposed in [1] and was compared to a previously known robust coding scheme, i.e., Common Description Scheme [4], in terms of a maximum distortion loss metric.…”

Section: A Hda-wz-costa-be (κ > 1)mentioning

confidence: 99%

“…In [8], Tian and Shamai posed the problem of finding the tradeoff between D + and D − , while keeping D optimum as in (1). They subsequently showed in [9] that remarkably, (1), (2), and (3), or (1), (4), and (5) can be achieved simultaneously for bandwidth expansion factors that are integers or unit fractions, respectively.…”

Section: Introduction Notation and Problem Definitionmentioning

confidence: 99%

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On robustness of hybrid digital analog source-channel coding with bandwidth mismatch

Koken

Tuncel

2014

2014 IEEE International Symposium on Information Theory

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The problem of lossy transmission of a Gaussian source over an AWGN bandwidth-mismatched broadcast channel with three receivers is addressed. The tradeoff between the distortion levels at the good and the bad receivers is tackled when the distortion at the median receiver is required to be optimal. The problem was proposed by Tian and Shamai [8], who subsequently found in [9] remarkable achievability results for bandwidth expansion ratios κ which are integers or unit fractions, i.e., κ = 2, 1/3, 1/5, etc. Their result is extended here to all κ ≥ 2 and κ ≤ 1/2 by generalizing the hybrid digital/analog (HDA) scheme of [10] to the case of bandwidth mismatch. Finally, novel schemes are proposed for 1/2 ≤ κ < 1 and 1 < κ ≤ 2 achieving nontrivial tradeoffs.

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“…HDA-WZ-BE was previously proposed in [1] and was compared to a previously known robust coding scheme, i.e., Common Description Scheme [4], in terms of a maximum distortion loss metric.…”

Section: A Hda-wz-costa-be (κ > 1)mentioning

confidence: 99%

Section: Introduction Notation and Problem Definitionmentioning

confidence: 99%

On robustness of hybrid digital analog source-channel coding with bandwidth mismatch

Koken

Tuncel

2014

2014 IEEE International Symposium on Information Theory

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“…Recently, the joint source channel coding problem has also been considered in [24] and [25]. In [24], the distortion exponent for separate source and channel coding is derived when the side information sequence has two states, the side information average gain does not increase with the SNR, and the channel has Rayleigh fading.…”

Section: Introductionmentioning

confidence: 99%

“…In [24], the distortion exponent for separate source and channel coding is derived when the side information sequence has two states, the side information average gain does not increase with the SNR, and the channel has Rayleigh fading. In [25], HDA and joint decoding schemes are considered, and their performance is studied using the distortion loss, which quantifies the loss with respect to a fully informed encoder that perfectly knows the channels and side information states.…”

Section: Introductionmentioning

confidence: 99%

Joint Source-Channel Coding With Time-Varying Channel and Side-Information

Aguerri

Gündüz

2016

IEEE Trans. Inform. Theory

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Abstract-Transmission of a Gaussian source over a timevarying Gaussian channel is studied in the presence of timevarying correlated side information at the receiver. A block fading model is considered for both the channel and the side information, whose states are assumed to be known only at the receiver. The optimality of separate source and channel coding in terms of average end-to-end distortion is shown when the channel is static while the side information state follows a discrete or a continuous and quasiconcave distribution. When both the channel and side information states are time-varying, separate source and channel coding is suboptimal in general. A partially informed encoder lower bound is studied by providing the channel state information to the encoder. Several achievable transmission schemes are proposed based on uncoded transmission, separate source and channel coding, joint decoding as well as hybrid digital-analog transmission. Uncoded transmission is shown to be optimal for a class of continuous and quasiconcave side information state distributions, while the channel gain may have an arbitrary distribution. To the best of our knowledge, this is the first example in which the uncoded transmission achieves the optimal performance thanks to the time-varying nature of the states, while it is suboptimal in the static version of the same problem. Then, the optimal distortion exponent, that quantifies the exponential decay rate of the expected distortion in the high SNR regime, is characterized for Nakagami distributed channel and side information states, and it is shown to be achieved by hybrid digital-analog and joint decoding schemes in certain cases, illustrating the suboptimality of pure digital or analog transmission in general.Index Terms-Distortion exponent, joint source-channel coding, fading channel and side information, side information diversity, uncoded transmission, hybrid digital-analog transmission, joint decoding.

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“…A family of hybrid digital-analog (HDA) schemes are introduced in [12]- [14] to overcome the threshold and the levelling-off effects. In [15]- [17], HDA schemes are proposed for broadcast channels and Wyner-Ziv systems.…”

Section: Introductionmentioning

confidence: 99%

Source-Channel Coding for Fading Channels With Correlated Interference

Saleh

Chan

Alajaji

2014

IEEE Trans. Commun.

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We consider the problem of sending a Gaussian source over a fading channel with Gaussian interference known to the transmitter. We study joint source-channel coding schemes for the case of unequal bandwidth between the source and the channel and when the source and the interference are correlated. An outer bound on the system's distortion is first derived by assuming additional information at the decoder side. We then propose layered coding schemes based on proper combination of power splitting, bandwidth splitting, Wyner-Ziv and hybrid coding. More precisely, a hybrid layer, that uses the source and the interference, is concatenated (superimposed) with a purely digital layer to achieve bandwidth expansion (reduction). The achievable (square error) distortion region of these schemes under matched and mismatched noise levels is then analyzed. Numerical results show that the proposed schemes perform close to the best derived bound and to be resilient to channel noise mismatch. As an application of the proposed schemes, we derive both inner and outer bounds on the source-channel-state distortion region for the fading channel with correlated interference; the receiver, in this case, aims to jointly estimate both the source signal as well as the channel-state (interference).

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Gaussian HDA coding with bandwidth expansion and side information at the decoder

Cited by 6 publications

References 9 publications

On robustness of hybrid digital analog source-channel coding with bandwidth mismatch

On robustness of hybrid digital analog source-channel coding with bandwidth mismatch

Joint Source-Channel Coding With Time-Varying Channel and Side-Information

Source-Channel Coding for Fading Channels With Correlated Interference

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