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Polar Code is a new efficient coding technology, it is the first channel coding method that can be strictly proven to achieve channel capacity. Polar code as a highperformance error correction code technology, its huge application potential has also cause a strong concer among 5G standardization of communications research and development institutions and academic word. In the case of channel combining...
We experimentally demonstrate a vector-mode-division-multiplexing (VMDM) system based on opticalfrequency comb (OFC) over 80cm free space optical (FSO) link. The 228 Gbit/s data transmission has been achieved by using two basic vector modes over 20 wavelengths with direct detection orthogonal frequency division multiplexing (DD-OFDM) signal. The result shows that this VMDM system should be a good...
A C-band broadband polarization reconfigurable antenna array is introduced to enhance the spectrum efficiency and transmission capacity. This antenna array provides four kinds of polarization switching modes, including horizontal-polarization, vertical-polarization, left circularly-polarization and right circularly-polarization. Simulation results are presented and discussed, the performance verify...
We present a simple method to minimize the gain roll-off of the Rotman lens antenna with wide scans. Phase gradient transmission lines are used to neutralize a precipitous drop in the power efficiency of Rotman lens when the scan angle increases. To validate the proposed method, a Rotman lens antenna at X band with 8 beam ports and 9 array ports are designed and simulated. The results show that the...
In this paper, a novel single-pole-double-throw (SPDT) switch based on the ring structure is proposed, which can be applied in the multi-beam antenna arrays system. Different from the conventional SPDT switch, its reliability can be enhanced further for it does not involve any state of total reflection. Moreover, it can also perform as a power divider under the proper bias voltage.
The antenna structure generating orbital angular momentum (OAM) beam with small divergence angle is described in this paper. Luneberg lens, always used to generate high gain beam, is utilized in this structure to focus the OAM beam generated by the source. Luneberg lens is discretized into layers. With simulations, the OAM beam's divergence angle with 19 degree is successfully decreased to 5 degree,...
Sphere decoding (SD) is an efficient algorithm for Multiple-input Multiple-output (MIMO) digital communications. It has been showed to achieve near Maximum Likelihood (ML) performance with low complexity. However, the complexity of conventional SD algorithm is high under the specific environment. The performance and the computation complexity of SD algorithm is highly dependent on the initial choice...
In this paper, a T-shaped feed structure is presented that enhances the performance of a polarization diversity antenna. It is a four-port network that consists of two input ports and two output ports. The −10 dB relative impedance bandwidth is 6.64 GHz from 2.31GHz to 8.95 GHz, i.e., 117.9% and the isolation is at least 29.7 dB within the same band. Furthermore, the insertion loss is less than 0...
Based on the features and limitations of maritime communication in the associated areas, this paper focuses on the key technology of wide-band communication network at sea under E-navigation framework. New methods and strategies to realize wide-band communication as well as some issues to be tackled for ensuring its development had been addressed. Especially, the WiMAX (Worldwide Interoperability...
This work aims to build pixel-to-pixel correspondences between images from the same visual class but with different geometries and visual similarities. This task is particularly challenging because (i) their visual content is similar only on the high-level structure, and (ii) background clutters keep bringing in noises. To address these problems, this paper proposes an object-aware method to estimate...
We consider three kinds of minimum single source shortest path tree expansion problems. Given an undirected connected graph G = (V, E; w, c, b; s) with n vertexes, m edges and a positive constant H, w(e) is the length of edge e, c(e) is the capacity of edge e, b(e) is the unit cost to increase the capacity of edge e, H is a given capacity restriction value and s is a fixed vertex of G. For every edge...
Sphere decoding(SD)is an efficient algorithm which has been proposed in Multiple input Multiple output (MIMO) digital communication. Sphere decoding algorithm is based on the rule of maximum likelihood decoding algorithm, But SD algorithm does not like ML algorithm to retrieve all of the lattice. However, SD in some environment complexity is very high. The complexity of the SD is controlled by radius...
Affected by the special geographical environment and climate factors, some cities waterlogging occurred frequently, causing serious economic losses and social impacts. Because of certain topographic factors, once the heavy rain coming suddenly in the city, many of the major streets will be flooded by the water, how to better prevent the occurrence of waterlogging, or predict the depth of waterlogging...
Medical Big Data (MBD) is all concerned with the medical related bio-informatics data. The importance of medical investigations for disease identification and complications highly depend upon the quality data. This scientific era is the age of digital imaging and information processing. For every individual the medical record is collection of important data. Due to the smart telecommunication technology...
The brain-inspired spiking neurons are more biologically plausible and computationally powerful than traditional rate-based artificial neurons. Most of the existing spiking neuron based applications assume noise-free condition for learning and testing. However, noise widely exists in the network of spiking neurons and the neural response can be significantly disturbed by different types of noise....
With a similar capability of processing spikes as biological neural systems, networks of spiking neurons are expected to achieve a performance similar to that of living brains. In recent days, many great achievements have been made in spiking neuron models and its learning algorithm. We build an integrated model using spiking neural networks (SNNs), which performs phase encoding method and delay learning-based...
In this paper, we propose a new color image encryption and compression algorithm based on the DNA complementary rule and the Chinese remainder theorem, which combines the DNA complementary rule with quantum chaotic map. We use quantum chaotic map and DNA complementary rule to shuffle the color image and obtain the shuffled image, then Chinese remainder theorem from number theory is utilized to diffuse...
Wavelet analysis is the perfect combination of pure mathematics, applied mathematics and engineering technology which inherits and develops Fourier analysis and has been widely used. This paper mainly introduces the generation and development of wavelet analysis, discusses the characteristics of several commonly used wavelet functions, introduces the application of wavelet analysis in big data and...
Medical Big Data (MBD) is the most critical form of information. MBD over a colossal Wireless Network (WN) is a sophisticated area of concern. Every day WN is becoming more dense and complicated. The MBD can be saved to wireless network after applying suitable Wavelet Compression. The quality of MBD is the most important factor; which means efficient and reliable transmission. Wavelet Compression...
Finding the key nodes of the network is one of the most important applications in Community Detection. This paper combined Centrality, Cluster Coefficient and PageRank ideas, establish the measurement system of key nodes and according to the Kendal correlation coefficient of each index to modify the measurement system. Finally, using the Fagin algorithm to carry on the key nodes of the multidimensional...
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