Efficient utilization of rateless LDPC codes for satellite broadcasting services

Zhang, Meixiang; Li, Chunxiao; Kim, Soo‐Young

doi:10.1109/wcsp.2016.7752491

Cited by 6 publications

(12 citation statements)

References 12 publications

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“…A hard decision decoding method was originally utilized for rateless codes, because they were first proposed for erasure channels. Recently, soft iterative decoding algorithms were applied to rateless codes in order to use them in wireless systems where a large amount of coding gain was required to combat harsh channel conditions [6,10]. Since the encoding process of a rateless code is performed over a graph, an iterative decoding method based on belief propagation could easily be adopted.…”

Section: Rateless Codesmentioning

confidence: 99%

“…Due to this strong advantage of rateless codes, evolved multimedia broadcast multicast services (eMBMS) introduced in the third-generation partnership project (3GPP) adopted forward error correction (FEC) schemes with rateless codes in the application layer [3]. Satellite systems are an effective means of providing MBMS, and thus utilizations of rateless codes have been considered to provide efficient satellite broadcasting services [4][5][6][7]. For example, in order to overcome the heterogeneity of the receivers and reduce the number of retransmissions, the packet level FEC scheme using LT codes was incorporated in a satellite data broadcasting system in [4].…”

Section: Introductionmentioning

confidence: 99%

“…For example, in order to overcome the heterogeneity of the receivers and reduce the number of retransmissions, the packet level FEC scheme using LT codes was incorporated in a satellite data broadcasting system in [4]. In addition, raptor codes were investigated in combination with the digital video broadcasting via satellite (DVB-S) specification, which is one of the most popular standards for broadcasting satellite services (BSS) [5,6]. A cross-layer design of LT codes and LDPC codes was attempted for satellite multimedia broadcasting and multi-cast services, and the optimum parameters were designed to improve throughput performance for satellite multimedia transmission [7].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason they cannot be directly applied to HARQ schemes which require rate-compatible FEC schemes to process incremental redundancy operations. In this regard, combining a rateless code with the existing LDPC code can be a solution [6].…”

Section: Introductionmentioning

confidence: 99%

“…We especially focus on compensating rain fading in satellite systems by utilizing efficient soft iterative decoding algorithms for the proposed rateless coded schemes. The first proposal is to use rateless codes in the PHY layer to accomplish Type-II HARQ, by applying an efficient parallel soft iterative decoding algorithm to the rateless LDPC coded scheme proposed in [6]. We present the detailed equations and flowchart for the proposed algorithm and demonstrate the performance over a rain fading channel in the satellite system.…”

Section: Introductionmentioning

confidence: 99%

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Soft Iterative Decoding Algorithms for Rateless Codes in Satellite Systems

2019

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The satellite system is one of the most efficient means for broadcasting due to its wide service coverage as well as the fact that it can provide high data rate services by using high frequency bands. However, there are a number of problems in the satellite system, such as a long round trip delay (RTD) and heterogeneity of the channel conditions of the earth stations. Even though utilizing adaptive coding and modulation (ACM) is almost mandatory for the satellite systems using high frequency bands due to the serious rain fading, the long RTD makes it difficult to quickly respond to channel quality information, resulting in a decrease in the efficiency of ACM. A high heterogeneity of earth stations caused by a wide service coverage also makes it difficult to apply a uniform transmission mode, and thus satellite systems require receiver-dependent transmission modes. A rateless code can be an effective means to compensate for these disadvantages of satellite systems compared to terrestrial wireless systems. This paper presents soft iterative decoding algorithms for efficient application of rateless codes in satellite systems and demonstrates that rateless codes can be effectively used for hybrid automatic repeat request schemes.

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Section: Rateless Codesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft Iterative Decoding Algorithms for Rateless Codes in Satellite Systems

2019

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Rateless codes with adaptive parity allocation for satellite systems

Chan

Kim

2020

Satell Commun Network

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In this paper, we propose efficient parity allocation schemes when rateless codes are used in satellite communication systems in conjunction with an adaptive coding and modulation (ACM) scheme. ACM schemes are widely used in modern satellite communication systems to maintain the required error rate performance under channel impairment (such as rain fading observed in high-frequency bands). The performance enhancement of ACM can be achieved by providing a good channel prediction and mode allocation method. In the case of a channel prediction or allocation error, rateless codes can be used as an effective means of retransmission to compensate for the performance degradation. After investigating the performance behaviour of rateless codes combined with ACM, we derive a mathematical formula to find the optimum parity length of the rateless code to be retransmitted to satisfy the target performance requirements.Simulation results described in this paper show that the proposed method can be used to enhance the error performance as well as spectral efficiency. INTRODUCTIONFrequency bands are scarce and expensive resources in satellite systems, and thus efficient spectrum utilization is critical. Adaptive allocation of various resources such as coding and modulation modes with power margins, called an adaptive coding and modulation (ACM) scheme, has been considered as one method to enhance the efficiency of spectrum utilization. ACM schemes in satellite communication systems are powerful means of compensating for rain fading, which severely degrades the performance of systems operating in a high-frequency band. Even though high power margins can guarantee a good communication link, a large power margin of course requires expensive hardware at satellite earth stations and high power consumption at user terminals, thus further increasing service charges. 1Low-density parity check (LDPC) code is a linear forward error correction (FEC) coding scheme. LDPC codes are known to provide capacity limiting performance by virtue of a soft iterative decoding process at the receiver. For this reason, they were designated as FEC schemes in many modern communication and broadcasting standards, such as digital video broadcasting via satellite -2nd generation (DVB-S2) and its extension (DVB-S2X). 2,3 LDPC codes with various code rates are defined in the DVB-S2(X), and they can be applied to the ACM scheme in combination with M-ary amplitude and phase shift keying (APSK) modulation schemes.Good ACM performance requires accurate channel prediction and optimum mode allocation schemes. Prediction and allocation errors can be efficiently compensated if the ACM scheme in the physical layer properly interacts with its counterpart in the upper layer. The hybrid automatic repeat request (HARQ) scheme was considered as an efficient method to eliminate the problem of the prediction and allocation errors. The HARQ is a combination of an FEC scheme with the original ARQ scheme, and the FEC scheme used in HARQ should have its own rate compatibilities.H...

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Physical layer rateless codes for the SATCOM on‐the‐move system with blockage

Dai

Zhao

Zhang

et al. 2020

Satell Commun Network

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Physical layer rateless codes are employed to mitigate the link-blockage in satellite communication on-the-move (SOTM) systems. Both nonsystematic raptor (NR) codes and systematic raptor (SR) codes are investigated, where the blockagechannel is modelled as an additive white Gaussian noise-contaminated binary erasure channel (AWGN-BEC). The asymptotic performance of NR codes is obtained by extrinsic information transfer (EXIT) method, and it is proved theoretically that NR codes have capacity-approaching performance on this channel. A modified EXIT method is proposed to analyze the asymptotic performance of SR codes since the channel outputs not only continuous message but also discrete message. Due to the poor performance of existing SR codes on blockage-channels, the degree distributions are optimized and the resulting codes show much better performance. Moreover, the raptor codes are compared with hybrid automatic repeat request (HARQ) schemes in satellite communication systems.

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Efficient utilization of rateless LDPC codes for satellite broadcasting services

Cited by 6 publications

References 12 publications

Soft Iterative Decoding Algorithms for Rateless Codes in Satellite Systems

Soft Iterative Decoding Algorithms for Rateless Codes in Satellite Systems

Rateless codes with adaptive parity allocation for satellite systems

Physical layer rateless codes for the SATCOM on‐the‐move system with blockage

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