1. Statistical Approach for the Analysis of ETP-Model of SIMO-OFDM Transmission System in Multi-path Environment with Delay Spread Exceeding the Guard Interval
Yoshio Karasawa, Fellow IEICE
Abstract-Equivalent Transmission Path (ETP) model can be described as a technique for easily obtaining bit error rate (BER) characteristics due to the Inter-Symbol Interference (ISI) that is generated in Rayleigh fading or Nakagami-Rice fading environment . The ETP model has been developed for the analysis of OFDM digital transmission characteristics in which the delay spread of the multipath waves exceeds the guard interval . In this paper, a statistical approach for the development of ETP model along with SIMO-MRC (Maximal Ratio Combining) has been carried out in the Rayleigh fading environment.
Keywords- OFDM, SIMO, ETP-Model, Maximal Ratio Combining.
2. The H and F proteins of CAM-70 Measles virus Vaccine strain plays advantageous role to efficient entry into CEF.
Luna Bhatta Sharma 1,2*,
Department of Virology, Osaka City University Medical School, 1-4-3 Asahimachi, Abeno-ku, Osaka, Osaka 545-8585,Japan1;
Department of microbiology, Kathmandu College of Science and technology,Kalimati,Kathmandu,Nepal2.
Abstract— The CAM-70 measles virus (MV) vaccine strain is currently used for vaccination against measles and has been obtained from the Tanabe strain by adaptation in chicken embryonic fibroblast cells. The impairment of fusion-inducing ability of the CAM-70 hemagglutinin (H) and Fusion protein in both CD46- and the signaling lymphocyte activation molecule (SLAM)-expressing cells as well as an important role of CAM-70 matrix protein gene in adaptation to CEF at the early stage of the virus replication cycle has been examined in our previous study.CEF Cells does not express both the CD46 and SLAM as an receptors for viral glycoproteins. Therefore, the role of both H and F protein of CAM70 for efficient entry into CEF were examined. Different recombinant MVs possessing H and F and M genes derived from the CAM-70 strain were generated by replacing the individual genes of wild-type MV IC323 with the corresponding genes of the CAM-70 strain, singly or in combination. Their entry, replication, transcription and protein accumulation were examined in CEF. Our results demonstrated that MV needs to adapt to CEF at the entry steps and that the CAM-70 Hemagglutinin and Fusion protein gene plays an important role for efficient entry in CEF. The F and H proteins derived from the CAM-70 strain appear to utilize the unidentified entry pathway on CEF more efficiently than wild-type F and H proteins.
Keywords— MV vaccine strain, CEF cells, Hemagglutinin protein, Transcription, Growth kinetics.
3. Multiple Sensor Integration Within A Microcontroller Chip
Abstract- Just as human beings acquire information about their environment through their senses and process such information using their brain, electronic systems perform such functions by means of sensors and processing digital devices such as microcontrollers (μC) or microprocessors (μP). Nowadays, such small but smart devices have become essential in many fields (industrial, automobiles, aircraft, medical devices, consumer electronics, home appliances, etc.) so that it is hard to imagine a society without them.Multiple sensor integration within the controller is a rapidly evolving research area and requires interdisciplinary knowledge in control theory, signal processing, artificial intelligence, probability and statistics, etc. The advantages gained through the use of redundant, complementary, or timelier information in a system can provide more reliable and accurate information. This hypothetical study provides an overview of current sensor technologies and describes the paradigm of multi sensor integration techniques. Applications of multi sensor fusion in robotics, biomedical system, equipment monitoring, remote sensing, and transportation system are also discussed.
4. Performance evaluation of MIMO based WiMAX system
Abstract— In mobile communication system signals transmitted by a mobile station are reflected and scattered by the surrounding objects. Hence, the signals travel multiple paths, of different lengths and attenuations, before arriving at the base station. This phenomenon is well known as multipath propagation. Multipath propagation results in fading problem, which sets a bottleneck for achieving a very high data rate in Broadband Wireless Access (BWA) systems. Antenna diversity techniques have been proposed in the literatures to combat multipath fading problem. In this regard, Multiple-Input Multiple-Output (MIMO) techniques are considered to be essential for BWA systems like the IEEE 802.16e, which is popularly known as mobile WiMAX systems. Mobile WiMAX systems define the physical (PHY) layer and Medium Access Control (MAC) layer for mobile and portable BWA systems. In this paper, the performances of MIMO based WiMax system have been investigated. The simulation results presented in this paper show that the system performances, in terms of throughput and Bit Error Rate (BER), of WiMAX system can be improved significantly by using MIMO technique.
Index Terms— diversity, MIMO, multipath,WiMAX
5. Managed Services for Traditional Telecom Operator
Nepal Telecom, Strategic Planning Department, Head Office
Abstract— Since Eighties, a trend began for telecommunications network operators to outsource infrastructure as well as certain operational support to third party managed communications providers. Seeing the actual profitability in bringing a partnership with telecom and IT Managed Service Providers, the trend for adopting such trends have increased rapidly. In the past few years due to fast technological changes as well as demand for value added services, the managed service for content based value added service has also increased. This research provides insights into the current and future state of telecom managed services with a view into the anticipated marketplace.
Keywords—Managed Services; SLA; KPI; OPEX
6. Cloud Computing Technology:New Business for Telecom Operators
Pratima Pradhan†, Shyam S. Wagle‡
Nepal Telecom, Strategic Planning Department, Head Office
Abstract— Evolution of the internet has resulted with the evolution of the new kind of business model called cloud computing. Advantages of cloud computing are widely recognized as a viable way to reduce operational costs. It gives companies and individuals access to different kind of services without the need for the investment in traditional way, they pay only for the infrastructure and applications they use, for the time they use them. Most of the global telecom players are investing money in the cloud computing. These investment imply that cloud computing is the promising platform. In this article, it is trying to discuss what Telecom operators can do new business to be competitive with other IT solution providers on the market as cloud service providers. As most of the Telecom operators already have the infrastructure and centralized Data Center which gives them head start in this field, which it should use. For telecom operators who are at disadvantage stage in the Internet development, they should make use of its own users and resources, deploy their own cloud computing network according to the needs of the market and develop an appropriate business model to provide more information services, change from a Network provider to a information & service provider.
Keywords—Cloud Computing; Cloud Computing Models; Telecom Business; Cloud Securities
7. Traffic Grooming in Translucent Optical Networks Considering the Physical Layer Impairments
Suramya S. Dahal
Abstract— In WDM networks, traffic grooming has been used to increase the efficiency in utilizing high-capacity lightpaths. This research study investigates the problem of grooming sub-wavelength traffic streams into high capacity lightpaths in WDM based translucent optical networks. The considered translucent switching nodes are hybrids of transparent and opaque switching nodes and consist of both optical as well as electronic cores. An optical core can directly switch lightpaths from input ports to output ports, whereas an electronic core is capable of sub-wavelength traffic grooming, 3R regeneration and wavelength conversion. In addition, an electronic core contains electronic ports or O-E-O ports. Depending on the number of ports, only a limited number of lightpaths can be groomed, regenerated or wavelength converted. Distribution of these electronic ports in the network is vital for efficient performance. Thus, we develop an algorithm to distribute a fixed numbers of electronic ports throughout the network based on the topological structure and traffic information. With the distribution of the electronic ports in the network, integer linear programming (ILP) is implemented to optimally groom sub-wavelength traffic demands. Numerical results indicate significant advantages of distributing the electronic ports throughout the network compared to keeping them only at a small number.
Index Terms—3R, grooming, ILP, lightpaths, O-E-O, sub-wavelength, WDM.
8. MIMO Detections Schemes for Wireless Communications
Abstract— from comparative analysis of various detection methods, it is found that Maximum Likelihood has better performance however it has complexity issues with the number of transmitting antenna increased. Hence to mitigate such a problem low complexity detection algorithms such as zero forcing, minimum mean square error detection methods along with classical Successive Interference Cancellation (SIC) and vertical bell labs layered space time architecture are used to manage complexity. Among these detections algorithm, it is observed that vertical bell labs layered space time with minimum mean square error has optimal solution.
Index Terms— Bit Error Rate (BER), Multiple Input Multiple Output (MIMO), Zero Forcing (ZF), Minimum Mean Square Error (MMSE), Successive Interference Cancellation (SIC), Vertical Bell Labs Layered Space Time (VBLAST).