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Big data storage demands larger cluster. The increasing size of the cluster may lead to failures of larger number of nodes. To provide reliable big data storage, replications are not cost-effective and does not provide a robust solution to prevent data loss. Traditional erasure codes applied in the RAID system such as Reed-Solomon (R-S) based solutions have limitations in providing high reliability...
Error-Control Coding (ECC) now plays an important role in wireless transceivers because it helps to increase link reliability and lower required transmit power. One popular problem of ECC implementation is the trade-off between high coding-gain and decoder's complexity. In this paper, we propose a serial concatenated ECC solution which is a combination of truncated-iteration layered-decoding LDPC...
DVB-T2 (Digital Video Broadcasting Terrestrial Second Generation) standard is mainly intended to fix-reception service. Nevertheless, it is possible that some of enthusiastic users attempt to receive it in mobile environment. Therefore, formulating a technique for improving the reception quality is necessary, and exploring the received signal properties will be useful to do it. This paper presents...
Multithreshold decoder (MTD) is the simplest type of majority decoder that decodes self-orthogonal codes. Low computational complexity and simple decoding hardware implementation of multithreshold decoders allow using them in high speed communication systems and data storage systems that require decoding information at speeds above 1 Gbit/s. A high-speed software binary multithreshold decoder using...
A joint decoding strategy is proposed to reduce the time consumption of non-binary LDPC (NB-LDPC) decoding process. This strategy is based on the retention error characteristics of Multi-Level Cell (MLC) NAND flash memories. The raw bit error rate is estimated by an empirical formula of retention error increasing model. With the bit flip patterns caused by retention errors in a MLC NAND flash cell,...
Spin-transfer torque random access memory (STT-RAM) has emerged as a promising nonvolatile memory technology for its fast speed, small footprint and zero standby power. However, the unique and unusual high asymmetric error rates at different memory bit operations, which are proved to be far beyond the efficiency of common error correction codes (ECCs), greatly hinder its applications. In this work,...
This paper introduces a new family of rank metric codes: the Low Rank Parity Check Codes (LRPC) for which we propose an efficient probabilistic LRPC decoding algorithm concatenated with convolutional code associated with an interleaver. The main idea of decoding LRPC codes is based on calculations of vector spaces over a finite field F(q). This family of codes can be seen as the equivalent of classical...
In this paper we study the design of LDPC decoding scheme for very high throughput optical communications for a full self-seeded optical architecture dedicated to cloud radio access network (C-RAN). The objective of this paper is to demonstrate the potentiality of Bit Flipping (BF) algorithms. It is shown that the Gradient Descent Bit Flipping (GDBF) algorithm with a little improvement is suitable...
The three-phase process of achieving secret sharing over a wiretap channel are, respectively, advantage distillation, information reconciliation, and privacy amplification. In this paper, we first generalize the extended orthogonal space time block codes (EO-STBCs). Then, based on the generalized EO-STBCs (GEO-STBCs) and the feedback bits from the legitimate receiver, we propose a new advantage distillation...
This paper proposes a dual-clock based solution for QC-LDPC partially parallel flooded decoders. It aims at reducing memory and routing overhead, while maintaining a high degree of parallelism at processing node level. We take advantage of the high memory working frequencies with respect to the processing units, and use two clock domains: a high frequency for memory and the barrel shifter based routing...
Physical layer network coding (PNC) with channel coding is a strategy that applies error correction at the relay nodes of a relay system to improve data communication reliability of the whole relay system. So far, channel coded PNC schemes have been studied for two-way relay systems, but have not been systematically proposed for general multiple-way relay systems. In this paper, joint channel coding...
Based on the lower density parity check matrices in approximate lower triangular form allowed by the IEEE P802.11n/D1.04 (Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications) standards, LabVIEW FPGA programming language was used in this study to construct an encoder with a contract advantageous in the implementation of the hardware circuit that can generate codewords...
This paper evaluates the rate loss of fixed-length spatially-coupled low-density parity-check (SC-LDPC) code compared to the asymptotic performance of such code. In previous works, SC-LDPC with sufficient length of codeword shows excellent asymptotic performance and attracts a lot of attentions. However, when the length of codeword is limited, the performance of SC-LDPC code with limited codeword-length...
In this paper we study blind recovery methods for identifying the parameters of a convolutional code from an intercepted bitstream. It is assumed that the interceptor has no prior knowledge about the encoder and the recorded bitstream is noisy. The goal is to obtain the following parameters of convolutional code (i) number of inputs (ii) number of outputs (iii) constraint length of the convolutional...
In this work, reliable and secure transmission over generic-Gaussian wiretap channel model is investigated. An Adaptive Granular Hybrid Automatic Repeat reQuest (AG-HARQ) protocol is proposed which tries to minimize the required rate for successful decoding by the legitimate parties while amplifying the privacy by minimizing the information leakage to a wiretapper. In the case of LDPC decoding failure...
Memory is an integral and important component in most of the digital circuits. It is basically used for storing and retrieving data in many electronic circuits. In recent days, the soft errors affecting digital circuits have become the biggest challenge for memory applications. As technology is scaling down, the effect of single error upsets (SEUs) on memories further increased the concern on their...
Channel coding for the next generation communication system needs to support higher data throughput and transmission rate. Due to the inherent parallel feature, low density parity check (LDPC) codes comply with the target. In this paper, we propose a complete channel coding scheme based on structured LDPC codes. In our design, the correlation among different parity check matrices for different code...
Forward Error Correction codes are required to remove errors such as noise, crosstalk etc that transpire in communication channel. In this paper, we propose a concatenated (Single Parity Check, BCH and Low Density Parity Check) coding method to remove the errors and improve the efficiency of the system. Simulation results shows that Single Parity Check method along with BCH and Low Density Parity...
The multiple input multiple output (MIMO) technology combined with orthogonal frequency division multiplexing (OFDM) is a dominant air interface technology for 4G and 5G wireless communication technologies. In this paper we proposed a new threshold based soft partial parallel interference canceller for MIMO-OFDM system. The MIMO detector based on the hybrid use of soft minimum mean square error (MMSE)...
Differential pulse-position modulation (DPPM) shows significant power and bandwidth efficiency in wireless optical communications and does not need symbol synchronization, but suffers from serious insertion/deletion errors if the low-complexity symbol-by-symbol detection is used. In this paper, the DPPM transmission scheme combining the watermark with the low-density parity-check (LDPC) code is proposed...
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