A low-complexity unequal error protection of H.264/AVC video using adaptive hierarchical QAM

Fac. of Eng., Multimedia Univ.
IEEE Transactions on Consumer Electronics (Impact Factor: 1.05). 12/2006; 52(4):1153 - 1158. DOI: 10.1109/TCE.2006.273127
Source: IEEE Xplore


In this paper, a low-complexity unequal error protection (UEP) of H.264/AVC coded video using adaptive hierarchical quadrature amplitude modulation (HQAM), which takes into consideration the non-uniformly distributed importance of intracoded frame (I-frame) and predictive coded frame (P-frame) is proposed. Simulation results show that in terms of average peak signal-to-noise ratio (average PSNR), our proposed (EEP) scheme outperforms the equal error protection (EEP) by up to 5 dB

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Available from: Ryoichi Komiya, May 28, 2013
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    • "The major contributions on UEP aided layered video streaming techniques are summarized in Table I. In [68], [72], [80], [105], UEP schemes conceived for video transmission using hierarchical quadrature amplitude modulation (HQAM) were investigated, which considered the unequal importance of the different layers in SVC, as well as the unequal importance of both the intra-coded frames (I-frame) and of the predicted frames (P-frame). Specifically, the video bits of different importance were mapped to the different-integrity bits of the modulation constellation points of HQAM. "
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    ABSTRACT: Layered video coding creates multiple layers of unequal importance, which enables us to progressively refine the reconstructed video quality. When the base layer (BL) is corrupted or lost during transmission, the enhancement layers (ELs) must be dropped, regardless whether they are perfectly decoded or not, which implies that the transmission power assigned to the ELs is wasted. For the sake of combating this problem, the class of inter-layer forward error correction (IL-FEC) solutions, also referred to as layer-aware FEC (LA-FEC),1has been proposed for layered video transmissions, which jointly encode the BL and the ELs, thereby protecting the BL using the ELs. This tutorial aims for inspiring further research on IL-FEC/LA-FEC techniques, with special emphasis on the family of soft-decoded bit-level IL- FEC schemes.
    Full-text · Article · Apr 2015 · IEEE Communications Surveys & Tutorials
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    • "In [22], our co-author studied asymmetric 8-PSK for adaptive transmission strategies in mobile ad hoc networks. In [23], a low complexity UEP scheme using hierarchical QAM was discussed for H.264 video transmission. In [4], our coauthors demonstrated H.264 video quality improvement by using asymmetric 8-PSK modulation over Raleigh fading channels. "
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    ABSTRACT: We investigate the rate-compatible punctured convolutional (RCPC) codes concatenated with hierarchical QAM for designing a cross-layer unequal error protection scheme for H.264 coded sequences. We first divide the H.264 encoded video slices into three priority classes based on their relative importance. We investigate the system constraints and propose an optimization formulation to compute the optimal parameters of the proposed system for the given source significance information. An upper bound to the significance-weighted bit error rate in the proposed system is derived as a function of system parameters, including the code rate and geometry of the constellation. An example is given with design rules for H.264 video communications and 3.5-4 dB PSNR improvement over existing RCPC based techniques for AWGN wireless channels is shown through simulations.
    Preview · Article · Mar 2013 · Journal of Information Processing Systems
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    • "At the physical layer, UEP is achieved by using Forward Error Correction codes with different coderates and hierarchical modulation where each mapped symbol is represented by the Most Significant Bit (MSB) and the Least Significant Bit (LSB), thus creating unequal error protection at bit level [5]. In [6], Chang et al. used hierarchical QAM in UEP for robust transmission of H.264/AVC video data and another hierarchical modulation was also proposed in terrestrial video broadcasting [7]. The transmission of H.264 video data was done by applying Trellis-Coded Modulation (TCM) and hierarchical QAM in [8]. "
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    ABSTRACT: In this paper, it is proposed to design and implement a physical layer Unequal Error Protection (UEP) scheme based on convolutional codes and asymmetric 8PSK modulation. This scheme is combined with the UEP schemes at the application layer that is, multi-level unequal importance of compressed H.264/AVC video data. The proposed scheme takes the prioritized H.264 video data and encodes them with equal code rate convolutional codes as well as maps them to the asymmetric 8PSK constellation. In the mapping process, the Most Significant Bit (MSB) is given to the highest importance of the H.264 video data whilst the Least Significant Bit (LSB) is mapped to the lowest importance of the video. It is shown through simulation results that this proposed UEP scheme outperform the Equal Error Protection (EEP) scheme employing equal convolutional codes and symmetric 8PSK modulation. A 7 dB coding gain in PSNR is obtained with an overall rate of ½ over the uncoded modulation, both at a value of beta =0.48 and CNR = 18dB.
    Preview · Conference Paper · Jan 2011
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