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The goal of this paper is to provide analytical assessment that justifies the performance tendencies of practical encoding/decoding techniques for a binary data gathering wireless sensor network (WSN). The theoretical rate region of the WSN is approximately analyzed based on the Slepian-Wolf theorem. We also derive the bit error rate (BER) floor given the observation error probability by using the...
In this paper, we highlight the class of spatially coupled codes and discuss their applicability to long-haul and submarine optical communication systems. We first demonstrate how to optimize irregular spatially coupled LDPC codes for their use in optical communications with limited decoding hardware complexity and then present simulation results with an FPGA-based decoder where we show that very...
Endurance and retention are measured in 1Xnm Triple Level Cell (TLC) NAND and the flexible nLC scheme (flex-nLC) is proposed to improve reliability. This method enables the use of lowest-cost TLC NAND as is, in long term storage applications such as cold flash and digital archive: millennium memory, which have 20 and 1000 years retention, respectively.
Endurance and retention are measured in 1Xnm Triple Level Cell (TLC) NAND and the flexible nLC scheme (flex-nLC) is proposed to improve reliability. This method enables the use of lowest-cost TLC NAND as is, in long term storage applications such as cold flash and digital archive: millennium memory, which have 20 and 1000 years retention, respectively.
Recently, a new type of product-like codes, known as half-product codes, have been studied for OTN applications. Motivated by these codes, new classes of symmetry-invariant subproduct codes are proposed and investigated under iterative hard-decision decoding. A subset of the new class of quarter product codes has lower error floors than comparable half-product codes in terms of length, rate and performance.
The performance of the original successive cancellation decoder of short-length polar codes is inferior to that of the maximum-likelihood decoder. Existing sphere decoding algorithms of polar codes have a high computational complexity even for short lengths. This is because, when exploring the tree defined by the generator matrix of the code, existing algorithms employ loose branching conditions and...
Wireless communication is prone to partial packet due to the complex behavior of wireless signal propagation, especially in the dense-deployed wireless networks, where the interference signal is unavoidable. Such packet often contains a few errors, yet has to be retransmitted due to decoding failure. To avoid redundant transmission, partial packet recovery protocols are leveraged to identify and retransmit...
In this paper, a modified extrinsic information transfer (EXIT) chart analysis that takes into account the relation between mutual information (MI) and bit-error-rate (BER) is presented to study the convergence behavior of block Markov superposition transmission (BMST) of short codes (referred to as basic codes). We show that the threshold curve of BMST codes using an iterative sliding window decoding...
Energy consumption in sensor nodes and Link reliability are two of the major challenges in Wireless Sensor Networks (WSNs). The data exchanged between nodes and base station are vulnerable to corruption by errors induced by random noise, signal fading and other factors. In this regard, error control coding (ECC) is an efficient technique used to increase link reliability and to reduce the required...
Differential distributed space-time coding (DDSTC) has been proved to be suitable for wireless relay networks, since it can provide spatial diversity without the need for channel state information at neither the transmitter nor the receiver side. However, DDSTC suffers from significant error floor in fast-fading channel conditions with high Doppler frequencies due to rapid time variations. For this...
Wireless technology for communication, represents a permanent and evolutionary need in transport field, motivated by the improvement of the efficiency and safety of transports.
To increase areal density in bit-pattern media recording, space between bit islands must be reduced. This reason causes more severe of 2D interference composed from 2 type of interference: InterTrack Interference (ITI) that occurred by the islands in adjacent tracks and Inter-Symbol Interference (ISI) occurred by 2 adjacent islands in the same track. The 2D interference can generate either constructive...
Two-dimensional magnetic recording (TDMR) by shingled magnetic recording (SMR) draws attention as a next generation technology to increase recording densities in hard disk drive (HDD) [1]. TDMR exploits two-dimensional signal processing using the waveforms reproduced by array head from the intended and adjacent tracks to mitigate the impact of intertrack interference (ITI) [2]. However array head...
Bit-patterned media recording (BPMR), heat (or microwave) assisted magnetic recording (HAMR) and shingled writing (SW)/two-dimensional magnetic recording (TDMR) have been primed to further increase the areal density of magnetic recording beyond 1Tb/in2[1-3]. However, with the reduction of the track pitch, inter-track interference (ITI) becomes a major impairment for these magnetic recording systems...
Synchronization is the first operation in a digital base band receiver. The accuracy of the synchronizer shapes up the performance of the base band receiver. Synchronization is broadly divided into Carrier Frequency and Phase Synchronization, Symbol Timing and Frame Synchronization. If number of false detections in frame synchronization are high then large amount of power is wasted for processing...
Traditional encryption techniques require packet overhead, produce processing time delay, and suffer from severe quality of service deterioration due to fades and interference in wireless channels. These issues reduce the effective transmission data rate (throughput) considerably in wireless communications, where data rate with limited bandwidth is the main constraint. In this paper, performance evaluation...
Coded OFDM systems are generally employed to overcome the symbol recovery problem in uncoded OFDM systems that is caused due to loss of diversity in uncoded OFDM systems. In this paper, we extend our recent research work on low complexity post-coded OFDM (PC-OFDM) systems. We consider new spreading codes and detection algorithms for PC-OFDM in this paper. PC-OFDM systems introduce frequency diversity...
This paper considers the problem of improving the QoS of MPEG 2 video transmission over ADSL, which is an emerging technology that permits high bit rate transmission over subscriber lines. For this purpose, we propose to combine the use of the DP (Data Partitioning) MPEG 2 scalable mode and a modified coded DMT based ADSL modem that provides two different Bit Error Rates (BERs) for transmission: important...
Transmission efficiency is an interesting topic for data link layer developers. The overhead of protocols and coding should be reduced to a minimum. This maximizes a link throughput. This is especially important for high-speed networks, where a small degradation of efficiency will degrade the throughput by several Gbps. We describe a redundancy balancing algorithm for an adaptive hybrid automatic...
Differential matrix modulation is an attractive alternative for MIMO transmission since it does not require channel estimation at the receiver. Most proposals are based on unitary matrices. Assuming a receiver with relatively low complexity, we will show that the performance at higher bandwidth-efficiency can be improved by using non-unitary matrix constellations. We compare different non-unitary...
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