Unequal Error Protection in Image Transmission Based on LDPC Codes

Zhang, Yuling; Li, Xia; Yang, Hongyong

doi:10.14257/ijsip.2016.9.3.01

Cited by 8 publications

(12 citation statements)

References 8 publications

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“…The study outcome is testified using PSNR to find it better than existing system. A recent study by Zhang et al [8] have used uneven LDPC codes to make the image transmission much error resistive. Considering AWGN channel, the study outcome was testified using Bit Error Rate (BER).…”

Section: A Low-density Parity Check (Ldpc)mentioning

confidence: 99%

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

Gururaj¹,

Sadashivappa²

2017

ijacsa

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Abstract-Usage of image as data (or signal) is quite frequent in majority of the user-centric application. However, transmission of image over non-concrete communication medium like air is still vulnerable due to inherent weakness of wireless communication e.g. interference, noise, scattering, fading, security etc. Wireless image transmission has yet unsolved problems when it comes to error resiliency. In this paper, we have reviewed the significant research contribution published in last 5 years associated with wireless image transmission, channel coding mechanism, and investigated the scale of effectiveness in the techniques based on advantages and limitations. We also extracted a significant research gap, which requires immediate attention. Hence, we propose our future direction of work with an indicative architectural design in order to address the problems identified in research gap from existing literatures. This paper is meant to brief about the existing system and practical approaches to solve such problems.

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Section: A Low-density Parity Check (Ldpc)mentioning

confidence: 99%

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

Gururaj¹,

Sadashivappa²

2017

ijacsa

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“…In [12], UEP was used with schemes such as Optimized Scaling Factor (OSF) and Failed Check Nodes (FCN) to enhance the overall error performance. In [13], a scheme was introduced whereby UEP was performed by mapping the more important bits of an image to the variable nodes with higher degrees in irregular LDPC codes. After performing LDPC encoding, the parity check bits were mapped onto a spectrally efficient 16-QAM constellation and systematic bits were mapped onto a power efficient QAM constellation.…”

Section: Introductionmentioning

confidence: 99%

“…After performing LDPC encoding, the parity check bits were mapped onto a spectrally efficient 16-QAM constellation and systematic bits were mapped onto a power efficient QAM constellation. The scheme provided significant performance gains [13]. Additionally, in a NB-LDPC coded modulation system, the authors of [14] employed an UEP scheme based on the principle of bit reliability.…”

Section: Introductionmentioning

confidence: 99%

An unequal error protection scheme for non-binary LDPC using statistical QAM and prioritized mapping

Indoonundon

Pawan

2018

Serb J Electr Eng

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Low Density Parity Check (LDPC) codes are among the most popular channel codes used nowadays because of their ability to achieve near channel capacity performances. However, with the ever-increasing demand for reliable transmission of data at higher data rates, there is a need to narrow down the gap between the performance of LDPC codes and the channel capacity. LDPC codes and Quadrature Amplitude Modulation (QAM) have been widely deployed in wireless communication standards such as the IEEE 802.11n and Digital Video Broadcasting-Second Generation Terrestrial (DVB-T2). Recently, several Unequal Error Protection (UEP) schemes have been used to enhance the performance of LDPC codes. In this paper an UEP scheme is proposed for Non-Binary LDPC codes with QAM. The scheme uses the statistical distribution of the source symbols to obtain a more efficient statistical QAM constellation. Additionally, it uses the degree distribution of the nodes of the LDPC codeword to achieve prioritized QAM mapping. Simulations revealed that the proposed scheme can provide E b /N 0 gains of up to 0.78 dB and 1.24 dB with 16-QAM and 64-QAM respectively in the range BER≤10-2 .

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“…The same UEP principle was applied to IEEE 802.11n LDPC codes along with a modified hybrid ARQ scheme in [11]. An interesting scheme in [12] performed UEP by mapping more important bits of an image to variable nodes with higher degrees in irregular LDPC codes. After LDPC encoding the systematic bits were mapped onto a power efficient QAM constellation and the parity check bits onto a spectrally efficient 16-QAM constellation.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Statistical and Prioritised Unequal Error Protection Scheme for IEEE 802.11n LDPC Codes

Fowdur

Indoonundon

2017

Int. j. electr. comput. eng. syst. (Online)

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The combination of powerful error correcting codes such as (LDPC) codes and Quadrature Amplitude Modulation (QAM) has been widely deployed in wireless communication standards such as the IEEE 802.11n and DVB-T2. Recently, several Unequal Error Protection schemes which exploit non-uniform degree distribution of bit nodes in irregular LDPC codes have been proposed. In parallel, schemes that exploit the inherent UEP characteristics of the QAM constellation have also been developed. In this paper, a hybrid UEP scheme is proposed for LDPC codes with QAM. The scheme uses statistical distribution of source symbols to map the systematic bits of the LDPC encoded symbols to the QAM constellation. Essentially, systematic symbols having highest probabilities of occurrence are mapped onto the low power region of the QAM constellation and those with a low probability of occurrence are mapped onto the high power region. The decrease in overall transmission power allows for an increased spacing between the QAM constellation points. Additionally, the scheme uses the distribution of the bit node degree of the LDPC code-word to map the parity bits having the highest degree onto prioritised QAM constellation points. Simulations with the IEEE 802.11n LDPC codes revealed that the proposed scheme can provide gains of up to 0.91 dB in Eb/No compared with other UEP schemes for a range of Bit Error Rate (BER) values

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Unequal Error Protection in Image Transmission Based on LDPC Codes

Abstract: Abstract

Cited by 8 publications

References 8 publications

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

An unequal error protection scheme for non-binary LDPC using statistical QAM and prioritized mapping

A Hybrid Statistical and Prioritised Unequal Error Protection Scheme for IEEE 802.11n LDPC Codes

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