Applied Mechanics and Materials Vols. 513-517

Abstract: This paper presents a diversity-guided Particle swarm optimization (PSO) algorithm to resolve the Blind source separation (BSS) problem. Because the independent component analysis (ICA) approach, a popular method for the BSS problem, has a shortcoming of premature convergence during the optimization process, the proposed PSO algorithm aims to improve this issue by using the diversity calculation to avoid trapping in the local optima. In the experiment, the performance of the proposed PSO algorithm for the BSS problem has been investigated and the results are compared with the conventional PSO algorithm. It shows that the proposed PSO algorithm outperforms the conventional PSO algorithm.

Abstract: The sliding correlation acquisition technique, which is based on CAZAC sequences in OFDM time-domain multiple access, is proposed and verified. This technique takes advantage of the characteristics of good auto-correlation and cross-correlation characteristics of CAZAC sequences in time domain and achieves the purpose of multiple access discrimination by the different correlation peaks. Whats more, this technique can increase acquisition performance by multiple frames adding up in a receiver according to the receivers demand. The simulation in AWGN channel shows that the technique is feasible and effective in time-domain signal acquisition in OFDM system.

Abstract: This paper describes the use of configuration software MCGS as a platform to achieve the simulation data of transformation substation monitoring system and to achieve monitoring capabilities. It includes designing the interface of simulation system, creating the database, arranging the operation process, etc., and thus achieves the switching operation of substation system, failure demo, data display and record. The whole simulation system is convenient and simple to use, and can be applied to the practice of teaching and on-site training.

Abstract: In this paper, through the analysis of the redundant array of independent disks system (RAID), storage area network system (SAN), network storage system (NAS), based on RAID on the system FPGA is used to design a set of intelligent high speed disk storage protocol, through the test and analysis can meet the continuous data acquisition, the real-time data storage needs, in the software through providing high access speed increases memory buffer, large storage capacity and higher data security.

Abstract: In order to satisfy the requirement of reliability in the TD-LTE RF Conformance Testing Instrument, a method to achieve the trace of primitive of TD-LTE based on embedded system is imposed. According to the feature of the long term evolution (LTE) system, it highlights the details of primitive tracing through DMA and UART. The primitive is strongly real-time to achieve QoS in LTE. Verified multiple times this design achieves the primitive trace in LTE as well as meets the requirement of hardware platform in TD-LTE RF Conformance Testing Instrument.

Abstract: With 4G licenses issued in China, the RRM (Radio Resource Management) conformance test for TD-LTE system becomes a critical work. This paper will use TTCN-3 to achieve the corresponding test case in order to validate the protocol conformance in the measurement process of RRM in TD-LTE system. And it shows the method of implementation and generated GFT. The research work of this paper is supported by national science and technology major special "TD-LTE TTCN extension test set instrument development".

Abstract: Aiming at the complex and non-real-time in information exchange between the LTE PHY and MAC layer. Proposing a primitives interactive system solution which is based EMIF and The high-speed Ethernet interface.The management control information and the data information are sent separately by the EMIF and The EMAC interface,meeting the real-time needs of the project.The information is more accurate,efficient and better than using a single interface in this system for practice.

Abstract: In order for the RRM conformance of implementation in TD-LTE system idle_state, taking inter-frequency cell reselection procedure as the point of penetration, a new testing scheme is designed by developing testing and test control notation version 3(TTCN-3) test case to verify the RRM conformance. Furthermore, the test case is operated on the TTworkbench developed by German Testing tech. It also generates test execution flow chart to check the RRM conformance of idle_state functions.

Abstract: Social networks have been developed rapidly, especially for Facebook which is very popular with 10 billion users. It is a considerable significant job to build complex network similar to Facebook. There are many modeling methods of complex networks but which cant describe characteristics similar to Facebook. This paper provide a building method of complex networks with tunable clustering coefficient and community strength based on BA network model to imitate Facebook. The strategies of edge adding based on link-via-triangular, link-via-BA and link-via-type are used to build a complex network with tunable clustering coefficient and community strength. Under different parameters, statistical properties of the complex network model are analyzed. The differences and similarities are studied among complex network model proposed by this paper and real social network on Facebook. It is found that the network characteristics of the network model and real social network on Facebook are similar under some specific parameters. It is proved that the building method of complex networks is feasible.

Abstract: This paper mainly presents Access Point s (APs) performance according to 802.11g standard. Our study illustrates the performance of one AP, including its coverage performance, load-carrying properties and fairness. Performance analyses are evaluated by simulation for a dense wireless network. Our contribution is that the simulation and test results can be the basis offered to network operators.