Advanced Materials Research Vols. 989-994

Abstract: The video business has gradually become the main business of the network traffic, video traffic is Variable Bit Rate (VBR), which has nonlinear and sudden features, a single prediction model is not fit for describing those features, and prediction accuracy is not high. Because of wavelet analysis has advantages of multi-resolution and dealing with unexpectedness, and the neural network has better nonlinear fitting characteristics, in order to improve the prediction performance, the paper researched on the problem of VBR video traffic prediction based on neural networks, a novel prediction model AMWM is proposed, the model firstly introducing BP neural network to multi-fractal wavelet model, and designing prediction method, which introduced multi-fractal wavelet model to model VBR video traffic, and then applying BP neural network to forecast scale coefficient decomposed, and forecast multiplier using AR model, and predict traffic generated by wavelet reconstruction. Finally, the model is built and simulated. The experimental result shows that prediction performance based AMWM is better compared with multi-fractal wavelet model.

Abstract: In order to improve the network throughput and anti-jamming capability of UAV communications, physical layer network coding is applied in the UAV communications. Simulation results show that: the use of physical layer network coding can not only improve network throughput greatly, reduce the error rate of communication, but also enhance its anti-jamming capability,which satisfy UAVs’ requirements in modern warfare.

Abstract: The RAKE receiver has must been used in CDMA or 3G systems for its function to form the diversity reception of signals resulting from multi-path propagations. The basic condition for the implementation of RAKE receiver is that the spectrum spreading (SS) must be used in those systems. But that SS would not be existed in 4G system continuously, and OFDM and QAM would be used in that system instead. So the new method should be found to replace that SS code to separating those multi-path signals, making the RAKE receiver in 4G could be realized. This new method for the implementation of RAKE receiver in 4G System would be introduced in the paper, as well as the performance difference between those two kinds of Rake receiver.

Abstract: By analyzing mobile learning application mode of 4G network, combining with the technical characteristics of 4G network , a mobile learning system based on 4G was proposed. We described the architecture of system and found a solution to the flexibility question of multimedia service development in mobile learning.

Abstract: This paper presents the method of 3D human body data acquisition based on 3D scanning and the non-contact fit evaluation of clothing based on the distribution features of residual space between clothing and human body. A Kinect camera is employed to collect point cloud data. The points cloud is treated by Geomagic for noise reduction and surface reconstruction. By analyzing the residual space between clothing and human body, the fit distribution of scanned clothing can be achieved. The fit evaluation will make contributions to clothing design, online sales of clothing and virtual try-on.

Abstract: This paper presents a post-hoc analysis of telemetry data processing systems, introduces the design ideas and composition structure of the system, discussed in detail the design and implementation of key technologies demodulation processing module and the module frame involved. System to achieve a recording deal with post hoc analysis of telemetry data, to solve the current telemetry signal reception playback devices, high maintenance costs, has some economic benefits.

Abstract: The self-positioning for the nodes is the prerequisite for wireless sensor network to work, especially considering that the deployment of underwater node changes rapidly in position. Taking the issue of energy efficiency and prolong the network lifetime into account, the energy-efficient positioning technology of the underwater acoustic sensor network is studied in this paper .Brief introduction of the current node positioning technology is concluded in this paper too. Similarly to the overlapping ideological positioning algorithm FTPL we introduce RSSI but not for the ranging. Also discuss the inadequacies of our new algorithm, and the possible improvements. Simulation results show that the improved algorithm has good improvement in both the accuracy and the energy efficiency.

Abstract: With the development of communication technology, the increasing scale of power communication network is bigger and bigger. Based on the important significance of electric power communication network to establish an alarm information acquisition system is necessary. CORBA, as a distributed processing environment interconnect solutions in hardware and software, is widely used in the field of network management for its high versatility. In this paper we use real-time CORBA platform TAO as a network management platform to develop a kind of electric power communication network alarm acquisition system.

Abstract: The robustness of customer service system for telecommunications industry is researched. To overcome existing robustness defect of node failure in current network robust research model, node efficiency assessment of robustness is employed, generalized evolution theory is taken into, and changes process of telecommunications customer service systems is simulated. In analysis of conditions in different interference, robustness performance is presented. Simulation results show that the method considering the telecommunications industry to build robust customer service system is feasible and effective for large, complex networks, which has a good capability of computing power.

Abstract: For decades, symmetric cryptosystems, such as chaos-based ones, are designed for image encryption. In this paper, a novel public key scheme for image encryption is presented. Based on the improved elliptic curve cryptosystem and Arnold cat map, the novel scheme can offer high security while avoid exchange and distribution of secret keys. The experiments illustrate that the presented scheme is computationally less complex than the traditional asymmetric cryptosystems and suitable for large image encryption.