Performance of IEEE 802.11n LDPC codes with modified reliability based hybrid ARQ and Unequal Error Protection

Fowdur, Tulsi Pawan; Furzun, B.N.

doi:10.1109/eurocon.2015.7313674

Cited by 5 publications

(7 citation statements)

References 11 publications

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“…Reordering of the bits can now be performed such that the highest priority bits are given maximum protection by placing them on prioritised constellation points as explained next [10], [11].…”

Section: Fig 2 16-qam Constellation Diagrammentioning

confidence: 99%

“…For example, in the upper right minor quadrant, the 2 nd and 5 th bits are 00 for all four points. Hence, by placing two highest priority parity bits to the 1 st and 4 th positions, if the receiver correctly detects the major quadrant of the received symbol, these two parity bits will be correctly detected [10], [11]. After the reordering process, for the Hybrid 1 scheme, the systematic bits are modulated using S-QAM and , (5) where, d i is the distance from the symbol i to the origin in the constellation diagram, p i is the probability of QAM symbol i, M is the QAM order.…”

Section: Fig 2 16-qam Constellation Diagrammentioning

confidence: 99%

“…In [10], the authors extended the work of [9] with joint source channel decoding for LTE Turbo codes. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Fig 2 16-qam Constellation Diagrammentioning

confidence: 99%

Section: Fig 2 16-qam Constellation Diagrammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…In [10], the authors extended the work of [9] with joint source channel decoding for LTE Turbo codes. The same UEP principle was applied to IEEE 802.11n LDPC codes along with a modified hybrid ARQ scheme in [11]. In [12], UEP was used with schemes such as Optimized Scaling Factor (OSF) and Failed Check Nodes (FCN) to enhance the overall error performance.…”

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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“…Low‐density parity check (LDPC) codes were proposed by Gallager [1] in 1962 and reintroduced by Mackay and Neal [2] in 1996. They are one of the best error correcting codes that can achieve near Shannon limit performance, have low decoding complexity [3, 4] and have been used in many communication standards, such as DVB‐S2, IEEE 802.16 [5].…”

Section: Introductionmentioning

confidence: 99%

Improved min‐sum algorithm based on density evolution for low‐density parity check codes

Wang

Cao

et al. 2017

IET Communications

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Performance of IEEE 802.11n LDPC codes with modified reliability based hybrid ARQ and Unequal Error Protection

Cited by 5 publications

References 11 publications

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

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

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

Improved min‐sum algorithm based on density evolution for low‐density parity check codes

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