Mohammad Sigit Arifianto

Wireless transmission using universal software radio peripheral

Software-Defined Radio (SDR) is a technique using software to make the radio functions hardware independent. SDR is starting to be the basis of advanced wireless communication systems such as Joint Tactical Radio System (JTRS). More interestingly, the adoption of SDR technology by JTRS program is followed by military satellite communications programs. In the development of the SDR implementation, GNU Radio emerged as an open source tool that provides functions to support SDR. Later, Universal Software Radio Peripheral (USRP) was developed as a low cost, high-speed SDR platform. USRP in conjunction with GNU Radio is a very powerful tool to develop SDR based wireless communication system. This paper discusses the employment of GNU Radio and USRP for developing software based wireless transmission system. Furthermore, retransmission scheme, buffering and Leaky Bucket Algorithm are implemented to solve the transmission error and environment interference problems found during the implementation.

Queue Management for Network Coding in Ad Hoc Networks

Network Coding has been proven to be a method that will increase the throughput of network. Network coding will perform an XOR operation in the intermediate nodes to improve the throughput of the network. The simulation of network coding in AODV to search for the route to destination will be conducted in MATLAB. This paper introduces the development of simulation to illustrate the performance of network coding in wireless ad hoc network. The simulation will calculate the transmit packet time according to the size of the packet. Lastly, average network throughput performance between AODV network without network coding and network with network coding is shown and compared.

Mobile ad hoc network and mobile IP for future mobile telemedicine system

This paper discusses the design of mobile telemedicine for delivering medical health care services in remote areas under the Tele-emergency Project. The system design uses mobile Internet protocol version 6 (MIPv6) combined with rapidly deployable network based on mobile ad-hoc network (MANET) and IEEE 802.11 wireless LAN (WLAN) technology. The result of our preliminary simulation for the project, which is the simulation of VoIP traffic over MANET, is also presented here. The projects primary objective is to create a prototype of mobile telemedicine system including hardware and software that can be rapidly deployed in remote areas or in disaster situation where telecommunication infrastructures are lacking or destroyed

Multistage Image Clustering and Segmentation with Normalised Cuts

Normalised cuts algorithm requires massive similarity measurement computation for image segmentation. Since a digital camera at present has the capability to produce high resolution image, it will be inevitably that resizing image into suitable resolution at which the algorithm can perform image segmentation with minimal burden. While retaining the important features in the images, natural images are likely to be restricted for resizing them into a particular smaller resolution. Dividing an image into equal size of regions (named as image cells) for the segmentation is proposed here to solve the problem of missing important features when the image resolution is overly reduced. Gradually, the locally segmented clusters from the image cells are taken for second stage segmentation to merge them up globally. In this paper, experimental results using the mentioned method are shown. Experiment shows that it is capable to produce reasonable segmented clusters based on the proposed approach.

Telecardiology for e-Diagnosis and e-Learning in Rural Area of Sabah, Malaysia: A Novel Approach for Cardiac Services in Rural Medicine

Telecardiology is a newer alternative modality for providing effective cardiac care from a variable distances by utilizing information and information and communication technology. The cardiovascular diseases in rural population of Malaysia including Sabah are a leading cause of death. The scarcity of specialists, leads to delayed treatment, irregular follow up and ineffective monitoring. We aim to improve the cardiac care by telecardiology services. These services will be based on hybrid approach consisting of frequent tele consultations along with infrequent real regular follow up visits by physicians to evaluate clinical as well as diagnostic parameters. It will not only help us for early diagnosis, constant monitoring and quick remedial support, but will also prove to be cost effective alternative. These objectives were targeted. First, is to reduce the healthcare cost, followed by effective evaluation of tele cardiac tools (tele stethoscope and ECG) at variable distances and database for medical education. This novel approach will not only bridge the gap between rural and main hospitals, but will also provide the sense of security and emotional support amongst the patients.

Binary Genetic Algorithm Assisted Multiuser Detector for STBC MC-CDMA

In this paper we investigate the performance of multiuser detector (MUD) for space time block coded (STBC) multi-carrier code-division multiple-access (MC-CDMA) using binary genetic algorithm (GA). Optimum detection for CDMA based systems, including STBC MC-CDMA, using conventional MUD has a high computational complexity. For K number of users for instance, the computational complexity grows exponentially with K. Although suboptimum detection methods with less complexity are available, they are less powerful than MUD. To achieve the optimality of MUD while avoiding the computational complexity, we propose the use of binary genetic algorithm in the detector. For the evaluation, we simulated STBC MC-CDMA system over a frequency selective rayleigh fading channel. The receiver employs the binary genetic algorithm assisted MUD. For the purpose of comparison, STBC MC-CDMA receiver using equal gain combining (EGC) was simulated as well. The simulation result shows that the system under investigation performed better than STBC MC-CDMA using EGC.

The Smart Tele-emergency Project: a mobile telemedicine unit based on Mobile IPv6 and mobile ad-hoc network for Sabah areas

The paper proposes a mobile telemedicine system delivering medical health care services in Sabah areas under the Smart Tele-emergency Project. The system uses Mobile Internet Protocol version 6 (MIPv6) combined with a rapidly deployable network based on mobile ad-hoc network (MANET) and IEEE 802.11 wireless LAN (WLAN) technology. The primary objective of the Smart project is to create a prototype mobile telemedicine system, including hardware and software, that can be rapidly deployed in rural areas or in disaster conditions where telecommunication infrastructures are lacking or destroyed. We propose the integration of MIPv6, MANET and WLAN to provide telemedicine. This project is currently under refinement for simulation and implementation. The project is funded by IRPA (RM 445,000.00) for three years.

STBC MC - CDMA with Genetic Algorithm Based MUD for Wireless Multimedia Communications

Optimum detection for a direct sequence code-division multiple-access (DS-CDMA) system using conventional MUD is known to have a high computational complexity. For K number of users for instance, the computational complexity grows exponentially with K. The impact of this complexity problem is more serious for the more complicated variants of CDMA such as space time block coded (STBC) multi-carrier code-division multiple-access (MC-CDMA), since the processing of the received signal in this system requires more complex methods than that of DS- CDMA. Although suboptimum detection methods with less complexity are available, they are less powerful than MUD. To achieve the optimality of MUD while avoiding the computational complexity, we designed a binary genetic algorithm based MUD. For the evaluation, we simulated STBC MC-CDMA system over a frequency selective rayleigh fading channel. For the purpose of comparison, STBC MC-CDMA receiver using equal gain combining (EGC) was simulated as well. All systems were given an image input, whereby the received images shows that the system of interest has significantly better quality while maintaining reasonable computational complexity.

On the Development of Pervasive Computing Application in Telemedicine System

This paper describes the development of pervasive computing application implemented in Smart Tele-medicine System as part of the researches done in University Malaysia Sabah in order to deliver medical assistance to victims in hazardous situations and residents in the rural areas of Sabah. Issues discussed including Smart Tele-medicine System; software architecture and hardware architecture of the system; Bluetooth framework for the system and portlet development. Pervasive computing devices tend to be small and tiny is choosen in this research. In a tele-medicine environment smart devices are connected to the servers by employing Bluetooth wireless connection. Bluetooth is chosen for its convenience and mobility offered to users. It is low cost, low power consumption as well as secured. As device with WEME application installed detects the availability of Bluetooth transmission, it will attempt to build a PPP connection with request for WAS servlet which contains location information, which WAS will respond with a servlet containing the location information to the requesting WEME through which the users in the hospital emvironment can have all the facilities regarding their queries.

Investigations of the Use of PosEye for Position Measurements

The PosEye system is basically a position measurement system which takes images of the reference. The infra-red LEDs which emits IR lights is captured by the CCD and is used as the reference. In this system the absolute positioning and orientation were made with the help of a PosEye. The PosEye is normally fixed on a robot arm or the object which requires orientation of its own position in correspondence to its reference points in the working area. This paper discusses general ideas about reference markers, set-up procedures, and issues behind the sensor. This mainly includes the principles of PosEye sensor, basics of vision and cameras. The paper details the experiments in which results were obtained through the PosEye system with the help of electronics and PosEye camera. In the experimental setup, the connection of PosEye with the electronic application is presented, the usage of PosEye and the robot control system communication with the PosEye system using coordinate system. The working of the PosEye system is observed by taking images on the reference plate and finding the co-ordinates (x, y, z). The manipulation of the obtained images to the robot for a movement is also studied.