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Showing 1 to 20 of 59 for “"LDPC"”.
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A sampling technique based on LDPC codes
… To simulate this process in practice, an LDPC code is introduced. Its parity check values are uniformly randomly generated, and can be regarded as the index. Then we look for the most likely sequence that satisfies all the parity checks, and it will be proved that this sequence is a …
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Error Floor Analysis of Quasi-Cyclic LDPC and Spatially Coupled-LDPC Codes and Construction of Codes with Low Error Floor
… design and analysis of low-density parity-check (LDPC) codes in general and spatially coupled (SC) LDPC codes, in particular. At first, we analyze the error floor performance of finite-length protograph-based spatially coupled LDPC codes in terms of their design parameters. We conduct a …
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Mobile Banking Security Using GPS and LDPC Codes
… mobile devices, and low density parity codes (LDPC). The approach is to determine a user's daily locations, set them as trusted locations, and use LDPC codes not only to obscure this data from attackers, but to help in correcting inaccurate GPS readings. The conclusions, based on thorough …
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Importance sampling for LDPC codes and turbo-coded CDMA
Low-density parity-check (LDPC) codes have shown capacity-approaching performance with soft iterative decoding algorithms. Simulating LDPC codes at very low error rates normally takes an unacceptably long time. We consider importance sampling (IS) schemes for the error rate estimation of LDPC …
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Prime-sized multilevel flash memory with non-binary LDPC
… We design binary and non-binary Quasi-Cyclic LDPC codes and implement Belief Propagation decoders for them.
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LP/SDP hierarchy lower bounds for decoding random LDPC codes
Random (dv, dc)-regular LDPC codes (where each variable is involved in d, parity checks and each parity check involves d, variables) are well-known to achieve the Shannon capacity of the binary symmetric channel (for sufficiently large dv, and dc,) under exponential time decoding. However, …
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Sphere detection and LDPC decoding algorithms and architectures for wireless systems
… per transmit antenna has been also proposed. The LDPC decoding based on layered belief propagation is used for outer decoding. The block-structured LDPC codes are utilized. These codes have error-correcting abilities close to excellent fully random codes, and also they support modular decoders …
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The Analysis of Error Floor and Graphical Structure of LDPC Codes
… for counting them in the Tanner graph of LDPC codes, one for Tanner graphs of general LDPC codes, and one tailored for Tanner graphs of practically important quasi cyclic (QC) protograph LDPC codes.We show that for sparse graphs, the proposed algorithms significantly outperform the …
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Novel irregular LDPC codes and their application to iterative detection of MIMO systems
Low-density parity-check (LDPC) codes are among the best performing error correction codes currently known. For higher performing irregular LDPC codes, degree distributions have been found which produce codes with optimum performance in the infinite block length case. Significant performance …
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Single and joint iterative decoding for higher order modulation schemes
… in particular, low-density parity-check (LDPC) codes, iterative decoding on Tanner graphs, and their application on joint iterative receivers based on the turbo principle, previously proposed. The construction of random LDPC codes that fulfil certain desirable characteristics, such as …
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VLSI Architectures for Iterative Channel Decoders
Decoder architectures for LDPC codes introduce another complexity dimension related to the on-chip interconnect bottleneck of LDPC decoders. A new parameterized-core-based design methodology targeted for scalable and programmable LDPC decoders is proposed. The methodology solves the problems of …
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Trapping Sets of Iterative Decoders for Quantum and Classical Low-Density Parity-Check Codes
… the presence of noise. Low-density parity-check (LDPC) codes have been one of the most popular error correction candidates in modern communication and data storage systems. Similarly, their quantum analogues, quantum LDPC codes are being actively pursued as excellent prospects for error correction …
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On performance analysis and implementation issues of iterative decoding for graph based codes
… these long codes are low-density parity-check (LDPC) code and product code, which render brilliant performance. In this work, iterative decoding algorithms for LDPC code and product code are studied in the context of belief propagation. A large part of this work concerns LDPC code. First the …
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Unequal Error Protection Raptor Codes
… which is usually a Low Density Parity Check (LDPC) code. Existing UEP Raptor codes apply the UEP property on the Luby transform (LT) code part of Raptor codes. This approach lowers the bit erasure rate (BER) of the more important bits (MIB) of the data decoded by the LT part of the decoder of …
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Field-programmable gate-array (FPGA) implementation of low-density parity-check (LDPC) decoder in digital video broadcasting - second generation satellite (DVB-S2)
In recent years, LDPC codes are gaining a lot of attention among researchers. Its near-Shannon performance combined with its highly parallel architecture and lesser complexity compared to Turbo-codes has made LDPC codes one of the most popular forward error correction (FEC) codes in most of the …
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On the construction of some capacity-approaching coding schemes
… scheme is based on low-density parity-check (LDPC) codes. We first demonstrate that we can translate threshold values of an LDPC code between channels accurately using a simple mapping. We develop some models for density evolution from this observation, namely erasure-channel, …
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Low-density parity-check codes : construction and implementation.
Low-density parity-check (LDPC) codes have been shown to have good error correcting performance approaching Shannon’s limit. Good error correcting performance enables efficient and reliable communication. However, a LDPC code decoding algorithm needs to be executed efficiently to meet cost, time, …
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Optimization of a Coded-Modulation System with Shaped Constellation
… keying (APSK) and low-density parity check (LDPC) coding. Such a combination is typical of modern satellite communications, such as the system used by the DVB-S2 standard.;The system implementation requires that a subset of the bits at the output of the LDPC encoder are passed through a …
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