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Letteratura scientifica selezionata sul tema "Correlation and ldpc"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 8 febbraio 2022

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Articoli di riviste sul tema "Correlation and ldpc"

1

Fang, Yong, e Jechang Jeong. "Correlation parameter estimation for LDPC-based slepian-wolf coding". IEEE Communications Letters 13, n. 1 (gennaio 2009): 37–39. http://dx.doi.org/10.1109/lcomm.2009.081247.

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2

Oh, Ryanggeun, Hiuk Jae Shim e Byeungwoo Jeon. "Fast LDPC Decoding using Bit Plane Correlation in Wyner-Ziv Video Coding". Journal of the Institute of Electronics and Information Engineers 51, n. 4 (25 aprile 2014): 160–72. http://dx.doi.org/10.5573/ieie.2014.51.4.160.

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3

Garcia-Frias, J., e Wei Zhong. "LDPC codes for compression of multi-terminal sources with hidden Markov correlation". IEEE Communications Letters 7, n. 3 (marzo 2003): 115–17. http://dx.doi.org/10.1109/lcomm.2003.810001.

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4

Hu, Li Shuang, Ming Shan Liu, Yuan Zhou e Yang Sun. "Hybrid Decoding Algorithm for LDPC Codes with Circles". Advanced Materials Research 271-273 (luglio 2011): 258–63. http://dx.doi.org/10.4028/www.scientific.net/amr.271-273.258.

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At present, Low-Density Parity-Check (LDPC) codes widely used in many fields of communications have the best performance of all the Error Correcting Codes (ECC). This paper mainly studies the decoding algorithms of LDPC. It proposes an improved algorithm which is named Check-Variable nodes Hybrid(CVH) algorithm on the basis of the existing algorithms. The CVH algorithm can reduce the computational complexity during the check-node update while overcome with the correlation between the variable-node news in a code with circles. As well as, comparing with the original algorithms the performance of the new one saves 0.1 and 0.3 dB than Log-likelihood Ratios (LLR) Belief Propagation (BP) and BP - based algorithms under Additive White Gaussian Noise (AWGN) channel when the Bit Error Rate (BER) falls to through the simulation. This point shows that this algorithm can increase the decoding performance and reduce the error rate effectively.

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5

Xiaowei Jin, A. W. Eckford e T. E. Fuja. "Ldpc codes for non-coherent block fading channels with correlation: analysis and design". IEEE Transactions on Communications 56, n. 1 (gennaio 2008): 70–80. http://dx.doi.org/10.1109/tcomm.2008.050087.

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6

Bacci, Giacomo, Marco Della Maggiora e Marco Luise. "Iterative Channel Estimation for Nonbinary LDPC-Coded OFDM Signals". ISRN Signal Processing 2011 (14 aprile 2011): 1–8. http://dx.doi.org/10.5402/2011/254597.

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This work deals with the issue of channel estimation in the context of non-binary LDPC-coded OFDM systems over doubly selective multipath channels. In particular, we show how to derive an iterative Wiener-filter-based estimation method using both time and frequency channel correlation and considering the particular characteristics of the channel code. The proposed algorithm can use either soft information or hard decisions fed back by the decoder to refine the channel estimation, so as to improve the system performance at the expense of an increased receiver complexity. Simulation results under typical working conditions are presented to compare the performance of the proposed method with respect to classical techniques.

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7

Yuan, Ye, Liji Wu, Yijun Yang e Xiangmin Zhang. "A Novel Multiple-Bits Collision Attack Based on Double Detection with Error-Tolerant Mechanism". Security and Communication Networks 2018 (5 giugno 2018): 1–13. http://dx.doi.org/10.1155/2018/2483619.

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Side-channel collision attacks are more powerful than traditional side-channel attack without knowing the leakage model or establishing the model. Most attack strategies proposed previously need quantities of power traces with high computational complexity and are sensitive to mistakes, which restricts the attack efficiency seriously. In this paper, we propose a multiple-bits side-channel collision attack based on double distance voting detection (DDVD) and also an improved version, involving the error-tolerant mechanism, which can find all 120 relations among 16 key bytes when applied to AES (Advanced Encryption Standard) algorithm. In addition, we compare our collision detection method called DDVD with the Euclidean distance and the correlation-enhanced collision method under different intensity of noise, which indicates that our detection technique performs better in the circumstances of noise. Furthermore, 4-bit model of our collision detection method is proven to be optimal in theory and in practice. Meanwhile the corresponding practical attack experiments are also performed on a hardware implementation of AES-128 on FPGA board successfully. Results show that our strategy needs less computation time but more traces than LDPC method and the online time for our strategy is about 90% less than CECA and 96% less than BCA with 90% success rate.

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Thi Hue, Nguyen, e Nguyen Hoang Tung. "Study about Doping Ion La3+ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater". Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4893835.

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Lanthanum has been doped onto the surface of the natural Pyrolusite for simultaneous removal of phosphate and fluoride in aqueous solution. The adsorbent characterization of the materials was observed by the SEM, BET, and XRD techniques. The dynamics and isotherms models of fluoride and phosphate adsorption, with respect to pH, pHPZC, adsorbent dose, and effect of coexisting ions, were studied. The results showed that lanthanum doped Pyrolusite ore (LDPO) relatively highly adsorbed amount of phosphate and fluoride from aqueous solution. Phosphate and fluoride removal efficiencies of LDPO are approximately 97% and 95%, respectively. Pseudo-first order for kinetic studies of phosphate and fluoride removal of the LDPO was observed with high correlations for fluoride but weak correlations for phosphate. However, pseudo-second order for kinetic studies was high correlation for both phosphate and fluoride. The phosphate and fluoride adsorption capacities of the LDPO significantly decreased with the existence of coions (sulfate, chloride, and nitrate) in the aqueous solution.

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Ignatavičius, Gytautas, Alius Ulevičius, Vaidotas Valskys, Lina Galinskaitė, Peter E. Busher e Giedrius Trakimas. "Lunar Phases and Wildlife–Vehicle Collisions: Application of the Lunar Disk Percentage Method". Animals 11, n. 3 (22 marzo 2021): 908. http://dx.doi.org/10.3390/ani11030908.

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We investigated the relationship between lunar illumination based on the percentage of the visible lunar disk (LDP) and the frequency of wildlife–vehicle collisions (WVCs) in Lithuania. We analyzed WVC frequency during ten 10% LDP intervals to more precisely reflect the relationship between LDP and WVC. The 10% LDP interval approach showed a significant trend of increasing WVC frequencies with an increasing LDP at night. We also examined the correlation between the daily numbers of WVCs and LDP for different months and seasons. The relationship seemed to be stronger at night and during the late autumn–winter months, particularly in December, suggesting the importance of lunar illumination on WVCs. There was a weak positive correlation between LDP and overall daily number of WVCs (rs = 0.091; p < 0.001) and between LDP and night WVCs (rs = 0.104; p < 0.001). We found significant positive correlations for winter (December–February) (rs = 0.118; p = 0.012) and autumn (August–November) (rs = 0.127; p = 0.007). Our study suggests that the LDP interval approach may provide more possibilities for the evaluation and quantification of WVCs and lunar light relationships than the traditional lunar phase approach.

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Osegbe, Ifeyinwa, Martin Ugonabo, Chinwe Chukwuka, Ijeoma Meka e Nnamdi Nwosu. "Comparison of calculated versus directly-measured low-density lipoprotein-cholesterol: An evaluation of ten formulas for an HIV-positive population in Sub-Saharan Africa". Journal of Laboratory Physicians 9, n. 02 (aprile 2017): 111–15. http://dx.doi.org/10.4103/0974-2727.199632.

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Abstract BACKGROUND: Low-density lipoprotein cholesterol (LDLC) is a modifiable risk factor for atherosclerotic cardiovascular disease, therefore needs to be assessed and monitored. Direct homogeneous assays and various formulas exist to determine LDLC. We aimed to compare the directly measured LDL (dLDLC) with ten formulas for estimating LDLC. MATERIALS AND METHODS: This was a 2-year retrospective study of fasting lipid profile results obtained from HIV-positive patients attending an outpatient clinic at the University of Nigeria Teaching Hospital, Enugu, Nigeria, using homogeneous direct assays. Estimated LDLC was determined using ten formulas. Pearson’s correlation, Bland–Altman plots, and linear regression were performed. Statistical significance was P < 0.05. RESULTS: Three thousand four hundred and eighty-two lipid results with mean ± standard deviation (SD) dLDLC of 2.1 ± 1.1 mmol/L were included in this study. There was a strong, positive correlation between Friedewald’s LDLC and dLDLC n = 3412, r = 0.84, P < 0.001, but linear regression demonstrated a proportional bias P = 0.005. Ahmadi’s equation showed the worst correlation n = 3482, r = 0.35, P < 0.001, but when applied to samples with triglyceride (TG) <1.13 mmol/L (100 mg/dl), the correlation showed a strong, positive relationship n = 1395, r = 0.80, P < 0.001, and no proportional bias P = 0.86. Teerankanchana’s equation was the only formula that showed no difference between its LDLC and dLDLC (n = 3482, P = 0.056). It also demonstrated strong, positive correlation (n = 3482, r = 0.84, P < 0.001) and had a mean difference ± SD of −0.68 ± 0.63. CONCLUSION: Teerankanchana’s formula showed good correlation and minimal bias with dLDLC at all TG levels. Moreover, linear regression showed no difference in the two. It seems to be the most suitable formula for estimating LDLC in our HIV-positive population.

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Più fonti

Tesi sul tema "Correlation and ldpc"

1

Noorkami, Maneli. "Two sides of one tapestry : efficient implementation of the wavelet cryptosystem and a fast correlation attack via LDPC codes". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13848.

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shahen, mohamed. "Development of a Nakajima test and its potential variants setup on thin flexible LDPE film and Aluminum foil". Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19007.

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The thesis aimed to identify fracture strain for multiaxial loading for laminate material of Al and LDPE that is mostly used in the food packing technology specially in liquid packaging industry. These materials are thin and flexible which make it difficult to handle and test it. The investigation was through applying new Nakajima test setup on such a material by designing a custom setup and 3D printing the Nakajima setup prototype to be able to use it in this study. DIC technique was used to get the results from the Nakajima test and the software used to apply the DIC technique is GOM correlate. As a validation for measurement from such a technique, a tensile test has been done and measured strains were compared with those from the specimen from the Nakajima that has smallest width as it was close to a uniaxial loading. One more validation technique was by creating a FE-model using (Abaqus software) for the biaxial loading and comparing it to the biaxial loading results that obtained from the DIC analysis.

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MADDALA, PRANAY RAJ REDDY. "Investigation of Polymer packaging films behavior subjected to tension and tearing". Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15002.

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The course of polymer film functioning has been a crucial concern in the advent of packaging technology. The thesis project aims towards obtaining an understanding of mechanical properties for a class of these materials, namely LDPE and PET. A constitutive understanding of this behavior in the case of LDPE is acquired through incorporating a plastic stress strain relationship in an iterative approach with focus put on the sensitivity of a few parameters by following a simple linear curve-fit technique in a way that the global as well as the local response are predictable. FE-models also developed in this way are validated with experimental data. An inverse analysis testing validity or usefulness of DIC technique in identifying a material model is done and some discussions are drawn towards this area. A relative numerical study with respect to experimentally obtained global response for tearing of these polymers is done through use of a similar material model developed from tensile tests and the challenges faced in this area have been addressed.

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Pulicherla, Yashpal Surendhar Goud, e Ramkiran Kesana. "Experimental and Numerical Study of Orthotropic Materials". Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15710.

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In current enterprises, simulations are being utilized to lessen the cost of product advancement. Along this line, there is an awesome enthusiasm for enhancing precision and accuracy of simulations. For an accurate and reliable simulation, it is essential to use an accurate material model and provide it with accurate material information. In exhibit industries, orthotropic materials are being simulated utilizing isotropic material model, as orthotropic material model requires more material data which is not promptly accessible. This proposal intends to test and identify orthotropic materials and simulate them using orthotropic material model in ABAQUS. Materials utilized as a part of this proposal are Aluminium, LDPE, PET. Required material data was gotten by performing Uni-directional tensile tests, DIC, and an algorithm we developed in light of Inverses method. To get highly accurate material data from DIC, a few kinds of patterns were examined, and a superior pattern was resolved for camera configuration being utilized.

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5

Mare, Karel Petrus. "On the performance gain of STFC-LDPC concatenated coding scheme for MIMO-WiMAX". Diss., 2009. http://hdl.handle.net/2263/29915.

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In mobile communications, using multiple transmit and receive antennas has shown considerable improvement over single antenna systems. The performance increase can be characterized by more reliable throughput obtained through diversity and the higher achievable data rate through spatial multiplexing. The combination of multiple-input multiple-output (MIMO) wireless technology with the IEEE 802.16e-2005 (WiMAX) standard has been recognized as one of the most promising technologies with the advent of next generation broadband wireless communications. The dissertation introduces a performance evaluation of modern multi-antenna coding techniques on a MIMO-WiMAX platform developed to be capable of simulating space-selective, time-selective and frequency-selective fading conditions, which are known as triply-selective fading conditions. A new concatenated space-time-frequency low-density parity check (LDPC) code is proposed for high performance MIMO systems, where it is shown that the newly defined coding technique outperforms a more conventional approach by concatenating space-time blocks with LDPC codes. The analysis of the coding techniques in realistic mobile environments, as well as the proposed STFC-LDPC code, can form a set of newly defined codes, complementing the current coding schemes defined in the WiMAX standard.
Dissertation (MEng)--University of Pretoria, 2009.
Electrical, Electronic and Computer Engineering
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Capitoli di libri sul tema "Correlation and ldpc"

1

Noorkami, Maneli, e Faramarz Fekri. "A Fast Correlation Attack via Unequal Error Correcting LDPC Codes". In Topics in Cryptology – CT-RSA 2004, 54–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-24660-2_5.

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Meso, Peter, e Nancy Duncan. "Can National Information Infrastructures Enhance Social Development in the Least Developed Countries? An Empirical Investigation". In Information Technology Management in Developing Countries, 23–51. IGI Global, 2002. http://dx.doi.org/10.4018/978-1-931777-03-2.ch002.

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The need for national information infrastructures (NII) in the world’s least developed countries (LDCs) tends to be overshadowed by the nation’s severe deficiencies in physical infrastructure. Consequently NII may be inadequately addressed by governments and supporting agencies in their plans for stimulating social growth. The example of Singapore’s TradeNet and other lesser-developed countries developing national, electronic information infrastructures, suggests that information technology infrastructure may enable an LDC to develop at a particularly advanced rate. This paper studies the relationship of information infrastructure and social development. It establishes a clear correlation between 1) levels of information infrastructure and social development, and 2) growth rates of information infrastructure and social development. The findings suggest that governments of LDCs may enhance their countries’ growth by developing strategic plans for NII development.

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Meso, Peter Nelson, e Nancy Bogucki Duncan. "Can National Information Infrastructures Enhance Social Development in the Least Developed Countries?" In Advances in Global Information Management, 207–26. IGI Global, 2002. http://dx.doi.org/10.4018/978-1-930708-43-3.ch014.

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The need for national information infrastructures (NII) in the world’s least developed countries (LDCs) tends to be overshadowed by the nation’s severe deficiencies in physical infrastructure. Consequently, NII may be inadequately addressed by governments and supporting agencies in their plans for stimulating social growth. The example of Singapore’s TradeNet and other less-developed countries developing national, electronic information infrastructures suggests that information technology infrastructure may enable an LDC to develop at a particularly advanced rate. This paper studies the relationship of information infrastructure and social development. It establishes a clear correlation between 1) levels of information infrastructure and social development, and 2) growth rates of information infrastructure and social development. The findings suggest that governments of LDCs may enhance their countries’ growth by developing strategic plans for NII development.

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Atti di convegni sul tema "Correlation and ldpc"

1

Xu, Jun, Dongming Wang, Jin Xu, Xiaomei Xu, LiGuang Li e Xiaohu You. "Construction of Structured LDPC Code Based on Correlation Limitation". In 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring). IEEE, 2016. http://dx.doi.org/10.1109/vtcspring.2016.7504175.

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2

Macris, N. "Correlation inequalities: a useful tool in the theory of LDPC codes". In Proceedings. International Symposium on Information Theory, 2005. ISIT 2005. IEEE, 2005. http://dx.doi.org/10.1109/isit.2005.1523772.

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3

Vaezi, Mojtaba, e Fabrice Labeau. "Improved modeling of the correlation between continuous-valued sources in LDPC-based DSC". In 2012 46th Asilomar Conference on Signals, Systems and Computers. IEEE, 2012. http://dx.doi.org/10.1109/acssc.2012.6489314.

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4

Luong, Huynh Van, Xin Huang e Soren Forchhammer. "Multiple LDPC decoding using bitplane correlation for Transform Domain Wyner-Ziv video coding". In ICASSP 2011 - 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2011. http://dx.doi.org/10.1109/icassp.2011.5946783.

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5

Li, Li, Xiao Hu e Rui Zeng. "Correlation channel modeling for practical Slepian-Wolf distributed video compression system using irregular LDPC codes". In International Symposium on Multispectral Image Processing and Pattern Recognition, a cura di Yongji Wang, Jun Li, Bangjun Lei e Jingyu Yang. SPIE, 2007. http://dx.doi.org/10.1117/12.774796.

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Adjudeanu, Irina, Jean-Yves Chouinard e Paul Fortier. "On the correlation between error weights and syndrome weights for belief propagation decoding of LDPC codes". In 2009 11th Canadian Workshop on Information Theory (CWIT). IEEE, 2009. http://dx.doi.org/10.1109/cwit.2009.5069516.

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7

Tavakoli, H. "Source and channel optimal rate LDPC code design for one sender in BE-MAC with source correlation". In 2014 7th International Symposium on Telecommunications (IST). IEEE, 2014. http://dx.doi.org/10.1109/istel.2014.7000771.

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