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Improved coding-Theoretic and Subspace-Based Decoding Algorithms for a Wider Class of DCT and DST Codes

IEEE TRANSACTIONS ON SIGNAL PROCESSING 2010年第2期58卷 695-708页

作者： Kumar, A. Anil Makur, Anamitra Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore

The decoding of a class of discrete cosine transform (DCT) and discrete sine transform (DST) codes that are maximum distance separable codes (MDS) is considered in this paper. These class of codes are considered for error correction over real fields. All the existing algebraic decoding algorithms are capable of decoding only a subclass of these codes [which can be characterized into the Bose-Chaudhuri-Hocquenghem (BCH) form], and fails to decode the remaining even though they are MDS. In this paper, we propose a new generic algorithm along the lines of coding theoretic and subspace methods to decode the entire class of MDS DCT and DST codes. The proposed subspace approaches are similar to popular ESPRIT and MUSIC algorithms. The proposed algorithms also perform significantly better than the existing algorithms on the BCH-like subclass. A perturbation analysis is also presented to study the effect of various parameters on the error localization due to the quantization noise. Simulation results are presented to demonstrate the capability of proposed algorithms to decode the entire class and to perform significantly better on the BCH-like subclass than the existing algorithm under the influence of quantization noise.

关键词： channel coding discrete cosine transform (DCT) codes error correction coding joint source-channel coding subspace algorithms

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Slepian-Wolf coding over broadcast channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2006年第4期52卷 1469-1482页

作者： Tuncel, E Univ Calif Riverside Dept Elect Engn Riverside CA 92521 USA

We discuss reliable transmission of a discrete memoryless source over a discrete memoryless broadcast channel, where each receiver has side information (of arbitrary quality) about the source unknown to the sender. When there are K = 2 receivers, the optimum coding strategy using separate and stand-alone source and channel codes is to build two independent binning structures and send bin indices using degraded message sets through the channel, yielding a full characterization of achievable rates. However, as we show with an example, generalization of this technique to multiple binning schemes does not fully resolve the K > 2 case. joint source-channel coding, on the other hand, allows for a much simpler strategy (i.e., with no explicit binning) yielding a successful single-letter characterization of achievable rates for any K > 2. This characterization, which utilizes a trivial outer bound to the capacity region of general broadcast channels, is in terms of marginal source and channel distributions rather than a joint source-channel distribution. This contrasts with existing results for other multiterminal scenarios and implies that optimal schemes achieve "operational separation." On the other hand, it is shown with an example that an optimal joint source-channel coding strategy is strictly advantageous over the combination of stand-alone source and channel codes, and thus "informational separation" does not hold.

关键词： broadcast channels common information degraded message sets joint source-channel coding multiterminal separation theorem Slepian-Wolf

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Zero-Delay Hybrid Digital-Analog coding Under Energy Constraints

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IEEE COMMUNICATIONS LETTERS 2024年第2期28卷 263-267页

作者： Xu, Lu Chen, Xuechen Deng, Xiaoheng Cent South Univ Sch Comp Sci & Engn Changsha 410075 Peoples R China

This letter proposes a coding scheme for transmitting a Gaussian source with energy constraints in zero source delay scenario. While previous studies focused on the achievable minimum distortion with an infinite number of channel symbols, we also consider the robustness to finite symbols. The constructed scheme is based on the hybrid digital-analog (HDA) coding method, which encodes the quantized value of the source and the quantization error using a large number of channel symbols in total. Theoretical analysis reveals that our scheme achieves the optimal exponent and the same polynomial decay as in the existing work. Experimental results validate the performance gains of our scheme over the cutting-edge ones.

关键词： Hybrid digital-analog coding zero-delay energy-distortion tradeoff joint source-channel coding Gaussian channel

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Multiple-Description coding by Dithered Delta-Sigma Quantization

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IEEE TRANSACTIONS ON INFORMATION THEORY 2009年第10期55卷 4661-4675页

作者： Ostergaard, Jan Zamir, Ram Aalborg Univ Dept Elect Syst Aalborg Denmark Tel Aviv Univ Dept Elect Engn Syst IL-69978 Tel Aviv Israel

We address the connection between the multiple-description (MD) problem and Delta-Sigma quantization. The inherent redundancy due to oversampling in Delta-Sigma quantization, and the simple linear-additive noise model resulting from dithered lattice quantization, allow us to construct a symmetric and time-invariant MD coding scheme. We show that the use of a noise-shaping filter makes it possible to trade off central distortion for side distortion. Asymptotically, as the dimension of the lattice vector quantizer and order of the noise-shaping filter approach infinity, the entropy rate of the dithered Delta-Sigma quantization scheme approaches the symmetric two-channel MD rate-distortion function for a memoryless Gaussian source and mean square error (MSE) fidelity criterion, at any side-to-central distortion ratio and any resolution. In the optimal scheme, the infinite-order noise-shaping filter must be minimum phase and have a piecewise flat power spectrum with a single jump discontinuity. An important advantage of the proposed design is that it is symmetric in rate and distortion by construction, so the coding rates of the descriptions are identical and there is therefore no need for source splitting.

关键词： Delta-Sigma modulation dithered lattice quantization entropy coding joint source-channel coding multiple-description (MD) coding vector quantization

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Packet-by-packet adaptive scheme for video coding and transmission over wireless IP networks using rate-compatible punctured turbo (RCPT) codes

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WIRELESS PERSONAL COMMUNICATIONS 2007年第4期43卷 1675-1687页

作者： Pei, Yong Arnbetkar, Viraj S. Wright State Univ Dept Comp Sci & Engn Dayton OH 45435 USA

In this paper, we consider real-time video coding and transmission over packet-switched wireless IP networks, such as WLAN, using RCPT codes and joint source-channel coding (JSCC) with concentration on a packet-by-packet adaptive scheme. We present a systematic design methodology to enable the applicability of JSCC techniques. The performance of H.263+ video coding and transmission over wireless channel modeled as slow Rician fading channels using this approach is studied. Results indicate that a packet-by-packet adaptive RCPT-JSCC approach is of significant advantage for real-time video applications and leads to more acceptable video delivery quality over interference-limited and time-varying wireless networks.

关键词： video transmission RTP-H.263+ RCPT codes joint source-channel coding Rician fading

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A Minimum Mean-Squared Error Relay for the Two-Way Relay channel with Network coding

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IEEE COMMUNICATIONS LETTERS 2009年第3期13卷 196-198页

作者： Park, Moonseo Kim, Seong-Lyun Ajou Univ Div Elect & Comp Engn Commun Syst Lab Suwon 443749 South Korea Yonsei Univ Sch Elect & Elect Engn Radio Resource Management & Optimizat Lab Seoul 120749 South Korea

In this letter, we consider the two-way relay channel (TWRC) employing network coding. In TWRC, a conventional relay first decodes symbols from each user and combines (network coding) them using, for example, the XOR (eXclusive OR) operation. However, it may be suboptimal for the relay to use this concatenated approach, when the channels are noisy and the cost criterion is source distortion. Instead, we propose a new relay scheme that generates network coded symbols by performing symbol estimation and network coding operation jointly, in order to minimize the source distortion at the users.

关键词： joint source-channel coding minimum mean-squared error estimation network coding two-way relay channel

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Rate and power allocation for layered transmission with superposition coding

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IEEE SIGNAL PROCESSING LETTERS 2007年第11期14卷 773-776页

作者： Etemadi, Farzad Jafarkhani, Hamid Univ Calif Irvine Ctr Pervasive Communicat & Comp Dept Elect Engn & Comp Sci Irvine CA 92697 USA

We consider layered transmission of a Gaussian source over a quasi-static fading channel. A broadcast strategy is used in which multiple layers of source data are superimposed, and each layer is allocated a different power and transmission rate. For a multiple-antenna system where either the transmitter or the receiver has a single antenna, we propose a low-complexity algorithm for minimizing the expected end-to-end distortion of the received signal. Numerical results for a Rayleigh fading channel are presented, and the performance gain over a time-sharing strategy is quantified. It is numerically shown that for a wide range of operating conditions, equal rate allocation is as good as unequal rate allocation.

关键词： joint source-channel coding resource allocation superposition coding

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source and channel coding for Homogeneous Sensor Networks with Partial Cooperation

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2009年第3期8卷 1113-1117页

作者： Simeone, O. New Jersey Inst Technol CWCSPR Newark NJ 07102 USA

A sensor networks in which two nodes communicate a remote measurement to an access point is investigated (CEO problem). The focus is on assessing the performance advantages of cooperative encoding strategies as enabled by out-of-band and finite-capacity communication links between the sensors. The analysis assumes Gaussian source and observation noises, a quadratic (MSE) distortion metric and homogeneous sensors. With rate-constrained links between each sensor and the access point, an achievable rate-distortion trade-off is derived that reduces to known rate-distortion characterizations in the cases without and with perfect cooperation. This result is then extended to a Gaussian multiple access channel scenario by deriving achievable distortions with separate or joint source-channel coding. It is concluded that, for both scenarios, even modest values of the capacity of the inter-sensor links enable the optimal performance with full sensor cooperation to be approached.

关键词： Wireless sensor networks CEO problem cooperative transmission joint source-channel coding

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On Robustness of Hybrid Digital Analog source-channel coding with Bandwidth Mismatch

On Robustness of Hybrid Digital Analog Source-Channel Coding...

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IEEE International Symposium on Information Theory (ISIT)

作者： Koeken, Erman Tuncel, Ertem Univ Calif Riverside Riverside CA 92521 USA

ISBN: (纸本)9781479951864

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 k which are integers or unit fractions, i.e., k = 2, 1/3, 1/5, etc. Their result is extended here to all k >= 2 and k <= 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 <= k < 1 and 1 < k <= 2 achieving nontrivial tradeoffs.

关键词： Bandwidth mismatch hybrid digital/analog coding joint source-channel coding robustness

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Multi-layered video transmission over wireless channels using an adaptive modulation and coding scheme

Multi-layered video transmission over wireless channels usin...

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International Conference on Image Processing (ICIP 2001)

作者： Pei, Y Modestino, JW Rensselaer Polytech Inst Ctr Image Proc Res Elect Comp & Syst Engn Dept Troy NY 12180 USA

ISBN: (纸本)0780367251

In this paper we describe a multi-layered video transport scheme for wireless channels capable of adapting to channel conditions in order to maximize end-to-end quality of service (QoS). This scheme combines a scalable H.263+ video source coder with unequal error protection (UEP) ac-cross layers. The UEP is achieved by employing different channel codes together with a multiresolution modulation approach to transport the different priority layers. Adaptivity to channel conditions is provided through use of joint source-channel coding (JSCC) which attempts to jointly optimize the source and channel coding rates together with the modulation parameters to obtain the maximum achievable end-to-end QoS for the prevailing channel conditions. Results indicate that this adaptive JSCC scheme employing scalable video encoding together with a multiresolution modulation/coding approach leads to significant improvement-, in delivered video quality for specified channel conditions. In particular, the approach results in considerably improved graceful degradation properties for decreasing channel SNR.

关键词： video transport unequal error protection scalable video coding joint source-channel coding MPSK adaptive modulation and coding

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