Sparse code multiple access (SCMA) is a promising technique for enabling massive connectivity and high spectrum efficiency in future machine-type communication networks. However, its performance crucially depends on well-designed multi-dimensional codebooks. In this paper, we propose novel progressive codebook optimization scheme that can achieve near-optimal over downlink fading channels. By examining the pair-wise error probability (PEP), first derive symbol rate (SER) of sparse channels,...

In this letter, the codebook design criteria for uplink Rician fading channels are explored. The probability distribution of weighted sums random variables from each frequency resource is derived based on independent non-central circular complex Gaussian variable. Then, considering pairwise error probability, key performance indicators multidimensional constellations A sub-optimal optimization approach deployed to generate an enhanced various scenarios. Finally, numerical results provided...

Bottom-hole differential pressure is one of the most important factors that affects drilling penetration rate. The purpose article to study effect bottom-hole on vertical stress field. On basis mechanical analysis rock, fluid-solid coupling model with established under axisymmetry condition and solved by using a numerical method. comparison distribution borehole wall between theoretical solution performed verify feasibility rationality model. Then state whole rock break carried out. results...

As the most important source rocks in eastern Junggar Basin, middle Permian Pingdiquan (P2p) have attracted increasing attention after discovery of tight oil Shazhang uplift. The P2p are widely distributed (up to 7546 km2) and an elevated thickness Basin. To explore resource 113 core samples from 34 exploration wells were analysed geochemically re-examined for their organic matter abundance, type thermal maturity, hydrocarbon potential sedimentary environment. Geochemical analysis results...

As a code-domain non-orthogonal multiple access technique, sparse code (SCMA) is considered as promising technique for future wireless Internet of Things (IoT) networks. The minimum Euclidean distance (MED) and product (MPD) have been highlighted the key performance indicators codebook in additive gaussian white noise (AWGN) downlink Rayleigh channels respectively. In this paper, based on mother codebook, novel design scheme proposed to achieve better error both AWGN channels. problem...

In this paper, an improved LT code with a reverse coding framework is designed to reduce the error floor caused by low-degree information nodes. For proposed scheme, well-designed threshold used mark nodes whose degrees are less than threshold, and these will be coded reversely connect enough candidate check To design optimal firstly, degree distribution of deduced. Then, parameter extrinsic gain-loss-ratio (GLR) evaluate convergence behavior code. Finally, 'slow increase region' GLR set,...

Sparse code multiple access (SCMA) is a promising technique for enabling massive connectivity and high spectrum efficiency in future machine-type communication networks. However, its performance crucially depends on well-designed multi-dimensional codebooks. In this paper, we propose novel progressive codebook optimization scheme that can achieve near-optimal over downlink fading channels. By examining the pair-wise error probability (PEP), first derive symbol rate (SER) of sparse channels,...

With the development of economy, requirement energy saving and emission reduction green shipping industry is becoming higher higher. Application photovoltaic power generation important to reduce pollution emissions from ships. The application system on ship still in stage, so there are many problems worth studying. In this paper, based grid-connected system, optimal allocation various sources optimization efficiency were studied. According different demands working conditions, improvement...

Intelligent safety supervision is an intelligent management technology based on BIM, Internet of things, big data, artificial intelligence and other technologies. The reliability traditional monitoring system relatively low in the case large amount data complex analysis, which easy to cause channel congestion affect transmission efficiency. In this paper, through real-time collection, analysis processing key regulatory elements such as human, machine, material, law environment construction...

The joint between all plains in unit sheet aluminum curtain wall which is hanged on main body architecture plugboard combination. change of ambient temperature and wind load generates the expansion joints, are performance index required gas water tightness, among walls suspension members. Thus obtained value very important to guide wall’s installation. Here, an assemble structure model has firstly been established, changing law joints also under kinds work conditions based previous ANSYS...

Power grid operation and maintenance decision-making reform is an important part of power system reform. With the construction massive historical quasi real-time data management platform, also advancing. However, in face explosion, business level logic become disorganized redundant. Based on actual situation Shenzhen Supply Bureau, sg-erp center composed structured center, unstructured GIS center. unprecedented growth application data, can improve promote The experimental results show that...

Sparse code division multiple access (SCMA), as a new radio technology in 5G, can be modulated by Orthogonal frequency multiplexing (OFDM) to improve the link quality of Single-user. In this paper, codebook design method based on resources is proposed case Single-user SCMA-OFDM. Due complexity optimizing codebook, constellations are converted real domain for optimization. The problem, however, still quadratic constrained programming (QCQP) optimization which hard find global Optimal...

This paper focuses on greenhouse gas emissions of new energy ships by investigating efficiency the using solar photovoltaic system. According to operating characteristics diesel generator set, a novel model engine was established, where system included analyze efficiency. In order evaluate feasibility and availability proposed model, experimental data acquired from testing, in real-world large ro-ro ship, collected compared with output. The fuel consumption without use used ship’s comparison...

To avoid the excessive activity (wear and tear) of propulsion system in Dynamic Positioning, Kalman filter is proposed to remove disturbance caused by noise high-frequency motion ship estimate low-frequency including position heading information for a specific model this paper. Simulation results indicate that estimation Positioning valid.

As a promising non-orthogonal multiple access scheme, sparse code (SCMA) can support massive connections in the 5th generation communication system. However, previous works on SCMA mainly focus regular factor graph matrix, which only applies to connectivity same scenario. In this paper, taking channel states of multi-users each frequency into consideration, codebook is designed with an irregular matrix. The superimposed constellations are without overlapped points, thus codebooks constructed...

Abstract During the operation of power system, there is a certain loss when electrical energy transmitting through line, The losses in line are usually dominated by active network losses. current research mainly uses reactive optimization to reduce system. Traditional optimized for static time, and state equipment does not change, which meaningless actual engineering.A full-text model established purpose reducing loss. QPSO algorithm used dynamically optimize load place different periods...

The application of image processing technology and intelligent recognition in power equipment analysis is a new method to monitor the operation status equipment. Especially high voltage, dangerous harsh environment, it can obtain real time. At same time, this reduce workload dispatchers improve automation degree on-line monitoring. In paper, set methods for fault detection are proposed, which maximum inter class variance selection threshold, sequential similarity identification, frame...

Reducing the area and power dissipation of FSM circuit is significant importance for EDA technology. Many methods are adopted to achieve an effective fast transformation FSMs binary codes, including Genetic algorithm (GA) others. In this paper, we propose a GA based state assignment gain minimization consumption area. We modify traditional mutation be ordered operation, which also substitution crossover that guarantees every new individual owns better fitness than old one. test proposed with...

Steam assisted gravity drainage (SAGD) technology has been industrialized popularization and application in our country, according to the characteristics of Xing group I SAGD experimental zone liaohe oilfield, production stage injection-production parameters such as operating pressure, Sub - Cool control, steam injection rate, dryness, factor are studied selected.