Over-Complete Mapping Aided, Soft-Bit Assisted Iterative Unequal Error Protection H.264 Joint Source and Channel Decoding

Nasruminallah,; El‐Hajjar, Mohammed; Othman, Noor Shamsiah; Quang, A.P.; Hanzo, Lajos

doi:10.1109/vetecf.2008.161

Cited by 13 publications

(7 citation statements)

References 12 publications

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“…Note that we always make the overall code-rate of all partitions to be the same for all the arrangements of Table I. Moreover, the intra-frame coded information carried by the type B partition is more important than the inter-frame coded information of the type C partition [16], [21]. Hence stronger protection was arranged for the type B partition than for the type C partition in the UEP1 related regimes.…”

Section: Simulation Resultsmentioning

confidence: 99%

Inter-layer FEC decoded multi-layer video streaming

Huo

Zuo

Maunder

et al. 2012

2012 IEEE Global Communications Conference (GLOBECOM)

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Abstract-Layered video coding creates multiple layers of unequal importance, where the enhancement layers will be affected when the base layer is corrupted. In this treatise, a novel inter-layer FEC scheme is investigated, where the information of the base layer 1 is incorporated into the systematic bits of the enhancement layers with the aid of an exclusive-OR operation. When the base layer can be recovered independently, the soft information of the enhancement layers can be deduced by flipping the sign of the check information received. In this case, the protection strength of the enhancement layer is unaffected and no extra protection bits are required. Otherwise, the inter-layer FEC decoding philosophy related to the base layer and the enhancement layer will be activated to assist in decoding the base layer, where the protection of the enhancement layer is additionally exploited to protect the base layer. Data partitioning based experiments show that our proposed scheme outperforms the traditional unequal error protection FEC aided transmission system by about 1.8 dB of channel SNR or 7.7 dB of PSNR at an acceptable complexity.

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Section: Simulation Resultsmentioning

confidence: 99%

Inter-layer FEC decoded multi-layer video streaming

Huo

Zuo

Maunder

et al. 2012

2012 IEEE Global Communications Conference (GLOBECOM)

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“…An iterative-source-and-channel-decoding-aided irregular convolutional coded videophone scheme using reversible variablelength codes and the maximum a posteriori (MAP) [19] detection algorithm was proposed in [20]. The performance analysis of soft-bit-assisted iterative JSCD was presented in [21], where differential-space-time-spreading-aided spherepacking modulation was invoked, which dispensed with channel estimation and provided both spatio-temporal diversity and multiuser support. Furthermore, a joint source-channel decoding method based on the MAP algorithm was proposed by Wang and Yu [22].…”

Section: Exit-chart Optimized Short Block Codes For Iterative Joint Smentioning

confidence: 99%

EXIT-Chart Optimized Short Block Codes for Iterative Joint Source and Channel Decoding in H.264 Video Telephony

Nasruminallah

Hanzo

2009

IEEE Trans. Veh. Technol.

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Abstract-In this paper, we propose a family of short block codes (SBCs) designed for guaranteed convergence in soft-bitassisted iterative joint source and channel decoding, which facilitate improved iterative soft-bit source decoding (SBSD) and channel decoding. Data-partitioned (DP) H.264 source-coded video is used to evaluate the performance of our system using SBCassisted SBSD, in conjunction with recursive systematic convolution (RSC) codes for transmission over correlated narrow-band Rayleigh fading channels. The effect of different SBC schemes having diverse minimum Hamming distances d H,min and code rates on the attainable system performance is demonstrated, when using iterative SBSD and channel decoding, while keeping the overall bit rate budget constant by appropriately partitioning the total available bit rate budget between the source and channel codecs to improve the overall bit error rate (BER) performance and to enhance the objective video quality expressed in terms of peak signal-to-noise ratio (PSNR).1 EXtrinsic Information Transfer (EXIT) charts were used to analyze the attainable system performance. Explicitly, our experimental results show that the proposed error protection scheme using rate-1/3 SBCs having d H,min = 6 outperforms the identical-rate SBCs having d H,min = 3 by about 2.25 dB at the PSNR degradation point of 1 dB. Additionally, an E b /N 0 gain of 9 dB was achieved, compared with the rate-5/6 SBC having d H,min = 2 and an identical overall code rate. Furthermore, an E b /N 0 gain of 25 dB is attained at the PSNR degradation point of 1 dB while using iterative soft-bit source and channel decoding with the aid of rate-1/3 SBCs relative to the identical-rate benchmarker. . However, only moderate residual redundancy is left in the sourcecoded bit stream when using advanced state-of-the-art coding techniques. Therefore, we propose to deliberately impose additional redundancy on the source-coded bit stream with the aid of the novel class of SBCs proposed. In our experimental setup, the H.264/AVC video codec [13] is used to encode the input video sequence and generate the source-coded bit stream. The H.264/AVC codec employs heterogeneous variable length coding and predictive coding techniques to achieve high compression efficiency, which makes the compressed bit stream susceptible to transmission errors [1]. A single bit error in the coded stream may corrupt the decoding of numerous future codewords. Moreover, due to predictive coding, the effects of channel errors may affect the neighboring video blocks due to error propagation. Therefore, the transmission of compressed video over wireless systems is a challenging task. Various errorresilient schemes have been proposed in [1] to alleviate these problems, but the price paid is potential reduction in the achievable compression efficiency and increase in computational complexity. An iterative joint source-channel decoding procedure inspired by the concept of serial concatenated codes was presented in [14]. A symbol-based soft-input a post...

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“…A joint video and channel coding system employing an iteratively decoded serial concatenation of a Vector Quantisation (VQ) based video codec and a Trellis-Coded Modulation (TCM) scheme was proposed in [7]. The attainable performance improvements of Iterative Source Channel Decoding (ISCD) Scheme employing a specific bit-to-symbol mapping scheme were analysed in [10], in the context of H.264 encoded video signals transmission using UEP and Sphere Packing (SP) modulation aided Differential Space Time Spreading (DSTS) in a non-coherently detected, diversity-aided multiuser scenario. Furthermore, the performance analysis of diverse low-complexity Short Block Codes (SBCs) for the transmission of H.264 coded video stream over correlated narrowband Rayleigh fading channels was presented in [11].…”

Section: Motivation and Backgroundmentioning

confidence: 99%

Iterative Detection Aided H.264 Wireless Video Telephony Using Irregular Convolutional Codes

Nasruminallah

Maunder

Hanzo

2009

2009 IEEE 70th Vehicular Technology Conference Fall

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Abstract-In this paper we evaluate the performance of a DataPartitioned (DP) H.264 coded video transmission system using Unequal Error Protection (UEP) IrRegular Convolutional Codes (IRCC). Using UEP, perceptually more important bits are provided with more strong protection relative to less important bits. An iterative detection aided combination of IRCC and a rate-1 precoder was used to improve the overall BER performance and to enhance the objective video quality expressed in terms of Peak Signal-to-noise Ratio (PSNR). The effect of different error protection schemes on the attainable system performance is demonstrated, while keeping the overall bit-rate budget constant for the transmission of DP H.264 source coded video over correlated narrowband Rayleigh fading channels. In this paper we exploited the high design flexibility of IRCCs, which constitutes a family of different rate subcodes, while maintaining an excellent iterative decoding convergence performance. Additionally, due to the use of different-rate subcodes, IRCCs have the capability of providing UEP for the H.264 coded video stream. An EXIT chart matching procedure was used for the design of our specific IRCC. Additionally, EXIT charts were used for analysing the attainable system performance of various error protection schemes employed. Explicitly, our experimental results show that the proposed UEP scheme using IRCC outperforms its Equal Error Protection (EEP) counterpart employing regular convolutional codes by about 0.5 dB E b /N 0 at the PSNR degradation point of 1 dB. I. MOTIVATION AND BACKGROUNDMultimedia source coded information, such as speech, audio and video typically exhibit unequal sensitivity to channel errors [1,2]. Therefore, Unequal Error Protection (UEP) is used by exploiting the innate UEP capability of IrRegular Convolutional Codes (IRCCs) due to the employment of various constituent codes having different coding rates to ensure that the perceptually more important bits suffer from a lower number of channel errors. The construction of IRCCs was studied by Tuchler and and Hagenauer [3], where a family of different convolutional codes having various coderates were designed with the aid of EXIT charts for achieving an improved iterative decoding behaviour for a serially concatenated system. For wireless multimedia applications maintaining both a high compression efficiency as well as a high integrity, while communicating over heterogeneous communication networks is of primary importance. Therefore, to evaluate the performance of our proposed error protection schemes, we used the high-compression efficient and network-friendly H.264/AVC source codec [4], which employs various variable length coding and predictive coding techniques to achieve compression efficiency. However, these coding techniques make the compressed bit-stream more vulnerable to the effects of channel errors. Due to variable length coding a single bit error in the video stream may render the correct decoding of future code words impossible. Moreover, due to predic...

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Over-Complete Mapping Aided, Soft-Bit Assisted Iterative Unequal Error Protection H.264 Joint Source and Channel Decoding

Cited by 13 publications

References 12 publications

Inter-layer FEC decoded multi-layer video streaming

Inter-layer FEC decoded multi-layer video streaming

EXIT-Chart Optimized Short Block Codes for Iterative Joint Source and Channel Decoding in H.264 Video Telephony

Iterative Detection Aided H.264 Wireless Video Telephony Using Irregular Convolutional Codes

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