Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Chou, Hong-Fu; Sham, Chiu-Wing

doi:10.1109/isocc.2017.8368811

Cited by 3 publications

(8 citation statements)

References 49 publications

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“…To recover the order of each binary on the decoding side, the de-interleaver is applied. In [89], the proposed regular interleaver and de-interleaver are shown in Fig. 6 with the assumption of semantic importance having a higher occurrence probability on the even position using the signal processing technique or semantic model.…”

Section: Jscc Layered Decoding Algorithmmentioning

confidence: 99%

Joint Source-Channel Coding System for 6G Communication: Design, Prototype and Future Directions

Zhong,

Sham,

et al. 2024

IEEE Access

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The emergence of the AI era signifies a shift in the future landscape of global communication networks, wherein robots are expected to play a more prominent role compared to humans. The establishment of a novel paradigm for the development of next-generation 6G communication is of utmost importance for semantics task-oriented empowered communications. The goal of semantic communication lies in the integration of collaborative efforts between the intelligence of the transmission source and the joint design of source coding and channel coding. This characteristic represents a significant benefit of joint source-channel coding (JSCC), as it enables the generation of source alphabets with diverse lengths and achieves a code rate of unity. Therefore, we leverage not only quasi-cyclic (QC) characteristics to facilitate the utilization of flexible structural hardware design but also Unequal Error Protection (UEP) to ensure the recovery of semantic importance. In this study, the feasibility of using a semantic encoder/decoder that is aware of UEP can be explored based on the existing JSCC system. This approach is aimed at protecting the significance of semantic task-oriented information. Additionally, the deployment of a JSCC system can be facilitated by employing QC-Low-Density Parity-Check (LDPC) codes on a reconfigurable device. The QC-LDPC layered decoding technique, which has been specifically optimized for hardware parallelism and tailored for channel decoding applications, can be suitably adapted to accommodate the JSCC system. The performance of the proposed system is evaluated by conducting BER measurements using both floating-point and 6-bit quantization. This is done to assess the extent of performance deterioration in a fair manner. The fixedpoint system is synthesized and subsequently used as a semantic feature transmission and reception system across a noisy channel, with the aim of presenting a prototype for semantic communications. This study concludes with some insights and potential research avenues for the JSCC prototype in the context of future communication.

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Section: Jscc Layered Decoding Algorithmmentioning

confidence: 99%

Joint Source-Channel Coding System for 6G Communication: Design, Prototype and Future Directions

Zhong,

Sham,

et al. 2024

IEEE Access

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“…, where n k and m k denote as the number of variable node degree k and of the check node degree k respectively. In [6], they illustrated a novel RLL flipped system to apply UEP LDPC code for resolving flipping error. It is worth mentioning that the channel equalizer and LDPC decoder combine to provide iterative decoding by computing the soft channel value.…”

Section: Uep Ldpc Coded System With Rll Constraint Using Deliberate F...mentioning

confidence: 99%

“…Chou et al [6] have proposed the allocation and unequal protection technique for a UEP LDPC coded system that includes an RLL constraint. They have shown the ability This approach is able to evaluate the node distribution without 102 the limitations of the girth property and the hamming distance.…”

Section: Performance Analysis Using the Proposed Density Evolutionmentioning

confidence: 99%

“…Furthermore, differential evolution [8] for the global optimum distribution is applied to implement the optimization approach. In this study, we exploited the analytic approach to provide an evaluation for an RLL flipped system described in [6]. This letter is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

“…In Section II, the UEP LDPC code is introduced in the sense of an irregular-LDPC code approach, together with an iterative decoding method that does not include an RLL encoder recording scheme with PLM based on the RLL flipped system described in [6]. In Section III, we derive the DE approach for the RLL flipped system in order to explain the results presented in [6]. The performance evaluation using the proposed DE together with the simulation results over optical recording channel are presented.…”

Section: Introductionmentioning

confidence: 99%

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An Optimization Approach for an RLL-Constrained LDPC Coded Recording System Using Deliberate Flipping

Chou

Sham

2018

IEEE Commun. Lett.

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For a recording system that has a run-length-limited 1 (RLL) constraint, this approach imposes the hard error by 2 flipping bits before recording. A high error coding rate limits 3 the correcting capability of the RLL bit error. Since iterative 4 decoding does not include the estimation technique, it has the 5 potential capability of solving the hard error bits within several 6 iterations compared to an LDPC coded system. In this letter, 7 we implement density evolution and the differential evolution 8 approach to provide a performance evaluation of unequal error 9 protection LDPC code to investigate the optimal LDPC code 10 distribution for an RLL flipped system. 11 Index Terms-Parity check codes, iterative decoding, partial 12 response channels, error correction codes. 13 been applied for timing recovery as well as for alleviating 16 inter-symbol interference (ISI). To achieve a high code rate 17 a recording system can be improved by alleviating the RLL 18 encoder that causes the rate loss within the system. Therefore, 19 the idea is to deliberately flip [3], [4] some bits of the 20 LDPC codeword to meet the RLL constraint on the write 21 side, and than use the error-correcting capability of the LDPC 22 code to remove the flipped bits on the read side. However, 23 the reading side of the recording system simultaneously suffers 24 from AWGN noise and flipping errors from the RLL insertion. 25 Chou et al. [5] provide an interesting approach to detecting the 26 location of the RLL flipping bit. This approach relies on the 27 proposed detection technique to correct any flipping errors, but 28 the decoding complexity of the system is increased though the 29 need to check each code bits. Rather than expanding on the 30 detection approach in [5], Chou et al. [6] have followed the 31 unequal error protection (UEP) design criterions to propose a 32 decoding scheme, where they have exploited the UEP LDPC 33 code by means of regular interleaver to confine the occurrence 34 of flipping errors to a section of the codeword. Well-design 35 LDPC codes and with higher code rate were compared to 36 demonstrate the merit of the proposed system. However, 37 the authors did not investigate a clear method of determining 38 the optimum LDPC code for the proposed system. Density 39 evolution [7] (DE) is a general method for determining the 40 capacity of LDPC codes. This method refers to the evolution 41 of the probability density functions (pdfs) of the messages 42

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A New Technique for Incorporating RLL Properties into 5G LDPC Codes Without Additional Redundancy

Farkas

Rakús

Palenik

2021

Wireless Pers Commun

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Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Cited by 3 publications

References 49 publications

Joint Source-Channel Coding System for 6G Communication: Design, Prototype and Future Directions

Joint Source-Channel Coding System for 6G Communication: Design, Prototype and Future Directions

An Optimization Approach for an RLL-Constrained LDPC Coded Recording System Using Deliberate Flipping

A New Technique for Incorporating RLL Properties into 5G LDPC Codes Without Additional Redundancy

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