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Continuous technology scaling makes NAND flash cells much denser. As a result, NAND flash is becoming more prone to various interference errors. Due to the hardware circuit design mechanisms of NAND flash, retention errors have been recognized as the most dominant errors, which affect the data reliability and flash lifetime. Furthermore, after experiencing a large number of programm/erase (P/E) cycles,...
In Wireless Sensor Networks energy (WSN) resources are limited. Most of the energy in a WSN is consumed in communication between the sensor nodes. Packet size is one of the important parameter of the wireless communication. Larger packets have low energy consumption per bit. However larger packets are less reliable. This paper studies packet size optimization in a WSN based on energy throughput and...
Recently, Digital Video Broadcasting (DVB) has evolved to improve the spectrum efficiency of current multimedia communications. This paper summarizes the main features and presents the error performance for the second generation of satellite DVB (DVB-S2) utilizing an upgraded MATLAB simulation model. In addition, the paper makes a validation of the developed simulation model by comparing between model...
Compressive Sensing (CS) provides a solid theoretical framework for sparse signal recovery. In this work, we concentrate on recovering the foreground object which can be represented as a sparse vector using wavelets. The method revolves around the CS framework by judiciously using the complex field BCH codes and the syndrome as measurements to achieve our goal of robust background subtraction using...
The evaluation of error correction code (ECC) for NAND flash memory is increasingly complicated by the increasing bit error rate in memory. The concept of error-free information capacity is proposed to evaluate the performance ECC of NAND flash memory. The new method simultaneously considers the capacity and reliability of NAND flash memory. Low-density parity-check (LDPC) codes with a medium code...
The present day video coding standards such as MPEG and H.264 are mainly used for broadcast applications, where the encoder is more complex than the decoder. However, for applications such as low power surveillance networks and wireless video cameras, where there is a dearth of hardware at the encoder, the encoder needs to be simpler, but the decoder can be complex. Distributed Video Coding (DVC)...
The design of multi-Gbps LDPC decoder has become a hot topic in recent years as the demand of transformation towards 5G. An energy efficient 18Gbps LDPC decoder based on LDPC ASIP with half layer paralleled architecture is proposed. The feasibility of the design is proven by its demonstrator silicon in 28nm CMOS technology, with a record energy efficiency of 18.4 pJ/decoded bit and area efficiency...
We construct 2D codewords by using 2D finite field Fourier transform. The components of the codeword in the transformed domain are from an extension field GF(2m) and are linked by a conjugacy constraint. We provide encoding and decoding schemes in the transformed domain.
The soft-decision decoding methods for maximum-transition-run (MTR) codes have been considered extensively, in order to enable a wider implementation of MTR codes in magnetic recording systems. The approaches, named as the min-max in LC and the max-log MAP in LC have been proposed, emerging as reasonable solutions for MTR codes. Both methods force the soft-values propagation through the Boolean logic...
A class of rate-compatible (RC) quasi-cycle low-density parity-check (QC-LDPC) codes that have linear encodable complexity and low error floor is presented. To ensure linear encoding complexity, a lower triangular (LT) form for the parity part of the mother parity-check matrix is designed. By the designed LT form, a recursive encoding strategy is proposed. This encoding strategy can achieve linear...
Cooperative communication is a bright technology to acquire diversity gain in wireless terminals by sharing their antennas. With the fixed amplify-and-forward (AF) mode, relay node always helps to relay the data of the source node with unchanged transmission power. Judging from the power efficiency, it is obviously not optimal, particularly when channel states are quite good. An adaptive AF mode is...
In this paper, a new Slepian-Wolf codec was constructed with spatially coupled Low-Density Parity-Check Convolutional (SP-LDPCC) codes. The approach is based on considering the correlation as a virtual binary erasure channel (BEC) and Binary-Input Additive White Gaussian Noise (BIAWGN)channel and applying the syndrome concept. The system is focusing on the compression of a equal-probable memory less...
Digital Subscriber Line (DSL) network access is subject to error bursts, which, for interactive video, can introduce unacceptable latencies if video packets need to be resent. If the video packets are protected against errors with Forward Error Correction (FEC) calculation of the application-layer channel codes themselves may also introduce additional latency. This paper proposes Low-Density Generator...
We present forward error correction systems based on a low-complexity LDPC decoding algorithm and randomly-structured LDPC codes. Simulation and ASIC synthesis results show throughput and net coding gain sufficient for long-haul applications, with greatly reduced energy consumption.
One serious challenge for flash memories is data reliability. In this work, we present the content-replication codeword problem, and it leads to our proposed joint decoder. We focus on joint decoding algorithms and study their theoretical decoding performances. The proposed scheme is novel for flash memories, and we show their reliability can be enhanced by increasing the diversity of error-correcting...
The focus of this article is on low-complexity capacity-achieving coding schemes for write-once memory (WOM) systems. The construction is based on spatially-coupled compound LDGM/LDPC codes. Both noiseless systems and systems with read errors are considered. Compound LDGM/LDPC codes are known to achieve capacity under MAP decoding for the closely related Gelfand-Pinsker problem and their coset decomposition...
In this paper, we introduce a new family of codes named as systematic spatially-coupled accumulate repeat accumulate SC-ARA codes based on chain of interconnected proto-graphs over the binary erasure channels (BEC). It has been observed that Spatially-coupled low density parity check (SC-LDPC) codes are able to approach the capacity universally across the binary-input memoryless (BMS) channels. A...
Memory is an important part of any digital circuit in which data is stored and retrieved. Technology scaling, lower operating voltages and high integration densities leads for failures in the reliability of memories. The main problem is Single Event Upsets (SEUs) that alters the memories from its normal way of functioning. This paper presents design and implementation of Majority Logic (ML) detecting/decoding...
While inheriting from RAID-6 codes protecting data against two simultaneous disk failures, XOR-based RAID-6 codes are low computational complexity due to only using exclusive-or operations to encode and decode, and are extensively studied and employed in practical. But the potential parallelism of these codes have not yet been sufficiently explored. In this paper, we observe that for XOR-based RAID-6...
Transmitted reference pulse cluster (TRPC) structure was proposed as an improved transmitted reference (TR) signaling for low date-rate ultra-wideband (UWB) communications. In the uncoded case, TRPC outperforms the conventional TR and non-coherent pulse position modulation (NC-PPM) signaling schemes. Moreover, it overcomes the implementation problem of the long delay line inherent in the conventional...
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