CCL Winter Camp 2014Daikura Ski Resort, Minami Aizu, Fukushima Mar. 5-6, 2014 |
Venue & Time
Day one: Skiing ActivitiesDay two: Workshop ProgramOpening By Prof. Anh T. Pham Approximation sum of random variables and its application in wireless communications By Pham Van Thanh
Abstract: Relay and
diversity techniques have been attracted much attention
in wireless communications. In such kind of systems,
received signal at the destination normally is the
summation of transmitted signals on each sub-channel.
For each kind of wireless networks, the sub-channel is
characterized by a specific random distribution.
Therefore, study on the sum of random variables is
necessary to investigate the performance of overall
system. In my presentation, we will introduce some
approximation methods for sum of random variables and
its applications in wireless communications. By Le Thai Hung Abstract: Advertisement is a crucial factor in business models of Internet video streaming. So far, most methods for advertisement insertion are implemented at a provider or a proxy inside the networks. In this paper, we present an approach for client-based advertisement insertion in HTTP streaming, which has become a new trend in multimedia delivery nowadays. The advantages of our approach include 1) client’s unawareness of advertisement media, 2) flexibility in inserting and personalizing advertisements, and 3) smooth transition between content and advertisement. Background subtraction and its application By Vo Tuan Dung Abtract: Background subtraction aims to isolate objects from the rest of the image which isn’t of interest; the reason for doing this should be obvious. For example, in video security, the camera mostly has no interest in boring background, which doesn’t change by time. What is of interest is when people or vehicles enter the scene and we want to segment those events from background. In addition, background subtraction also serves for separating parts of objects such as face, hands... from one person. In this work, I will study several background subtraction models and implement these methods in the context of hand segmentation. High efficiency MIMO VLC with spatial multiplexing gain By Tran Ngoc Anh Abstract: It is expected that LED lighting will be widely employed in lighting technology due to environmental and commercial advantages. Additionally, LEDs can also be used as a transmitter for data transmission this technology is referred to as Visible light communications (VLC). Especially, in typical indoor scenarios, e.g. office or home, VLC is expected as a strong contender to WiFi for home networking and a reliable successor in case of the use of WiFi is concerned. However, VLC have to overcome several challenges including limited bandwidth and applicable modulation schemes. Utilizing multiple input multiple output (MIMO) system is one promising approach to achieve high data rate connection. Two well-known MIMO techniques Spatial multiplexing (SMP) and Spatial modulation (SM) that offer the multiplexing gain becomes attractive research topic in several recent years. In my research, I will apply SM and SMP into an indoor VLC system in diffused environment. The system performance will be compared to realizing the benefit of two schemes over classical MIMO techniques Repetition code (RC). Design and Performance Evaluation of VLC Indoor Positioning System using Optical Orthogonal Codes By Sari Yamaguchi Abstract: Indoor positioning system has become popular in recent years. Visible light communication identification is a system that gets positioning information from LED lights. It is expected to use indoor environment, where GPS is unavailable. Our proposal is to design the VLC based indoor positioning system by using Optical Orthogonal Codes (OOC). The simulation room is considered the big area like major stations and airports. Finally, we evaluate that performance. An evaluation of bitrate adaptation methods for HTTP Live Streaming By Nguyen Van Duc
Abstract: In recent
years, HTTP streaming has been quick adopted by major
vendors and providers. Along with that, many adaptation
methods have been proposed. We will provide an
evaluation of such methods in context of live video
streaming. The evaluation is carried out not only in
terms of bitrate and buffer behaviors but also in terms
of the perceptual impact to end users. By Vu Trong Bach Abstract: In this paper, we analytically investigate the performance of selective relay FSO systems employing DF scheme and QAM taking into account of the fading effect caused by the atmospheric turbulence. The lognormal distribution is used to model the fading channel. The closed-form of system symbol-error rate (SER) is analytically derived, and the numerical results quantitatively highlight the impact of the number of relays, turbulence strengths and QAM signaling on the average SER improvement of the selective relay FSO systems. We also verify the theoretical analysis by Monte-Carlo simulation and a good agreement between the analytical and simulation results is confirmed. Cross-Layer Design and Analysis for FSO Links using Automatic Repeat Request and Adaptive Modulation/Coding Schemes By Vuong Viet Mai Abstract: This presentation introduces a framework for cross-layer management of data transmissions in free-space optical (FSO) systems over atmospheric turbulence channels, in which link layer automatic repeat request (ARQ) and physical layer adaptive modulation and coding (AMC) are integrated to improve the system’s spectral efficiency. The system performance is analytically studied in terms of average frame-error rate and average spectral efficiency, for which we derive closed-form expressions. In numerical results, we show how the proposed scheme significantly outperforms a conventional one, and discuss cross-layer designs for parameters’ selection in both physical layer and link layer to optimise the system performance over different atmospheric turbulence conditions. Bandwidth sharing for multiple streaming clients in home networks By Bui Duy Huong
Abstract: A few years
ago, we use a computer or IPTV for watching video at
home. Nowadays, any smart devices can also download and
display video from the Internet. So, a house's Internet
access link should Receive Diversity in Multihop Free-space Optical Communications By Luong Anh Duy
Abstract: In this
paper, we propose the use of spatial receive diversity
in multihop terrestrial free-space optical Simulation and performance theoretical analysis of OOK optical communication system using APD receiver By Abdoulaye Niang Abstract: For this project, using OOK optical communication model to simulate analysis the performance of the optical signal when an APD receiver is used. It was seem that the performance of such systems is affected by BER rate, however using APD receiver could improve the performance and optimised it by an appropriate selection of APD average gain. Optical Amplify-and-Forward Multihop WDM/FSO for All-Optical Access Networks By Trinh Viet Phuc Abstract: Multihop free space optical (FSO) system using optical amplify-and-forward (OAF) relaying technique combined with wavelength division multiplexing (WDM) is proposed for all-optical access networks. The proposed system can provide a low cost, flexible and high-bandwidth access network for multiple users. To investigate the system performance, we consider a special case of dual-hop WDM-FSO system taking into account the effects of all noises, interchannel crosstalks, as well as path loss and geometric spreading of optical beam over atmospheric turbulence channels. In addition, pulse position modulation (PPM) is employed for improving the overall performance. Our results show that OAF technique combined with PPM scheme can be a good solution for mitigating the effect of atmospheric turbulence. Moreover, the required amplifier gain corresponding to a specific value of BER, transmission distance, and turbulence strength is also quantitatively discussed. Closing + photo session: 12:00~12:15PM 12:30PM: Lunch at the Ski Resort |