International Journal of Informatics and Communication Technology (IJ-ICT)
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Web-based Geographic Information System Design of Rabies Spread in Bali
Get PDFRabies is still a serious threat in the province of Bali. Because of that Bali need a good management system service that can process data and information to support the government to make decision for preventing rabies outbreak. Nowadays, data management still uses spreadsheet technology that oriented to attribute data. Geographic Information System (GIS) is a system that has the ability to process, analysis the process and analyzes spatial data or data with geographic coordinates. This article will discuss the implementation of GIS that show the spread of rabies in the province of Bali by using GeoServer as the Open Geospatial Consortium (OGC) standards-compliant server to provide geospatial data via web services. These GIS application, supported by PostGIS database as storage and processing of spatial data and OpenLayers as an interface. This application can support government for making priority decision to focus on areas which has the most high of rabies outbreak.DOI: http://dx.doi.org/10.11591/ij-ict.v1i1.58
Uplink and Downlink of LTE-Release 10 in Cellular Communications
Get PDFIn LTE-Advanced, orthogonal frequency division multiple access (OFDMA) has been selected as the multiple access scheme for downlink and single-carrier frequency division multiple access (SC-FDMA) for uplink. OFDM is an attractive modulation technique in a cellular environment to combat frequency selective fading channels with a relatively low- complexity receiver. However, OFDM requires an expensive and inherently inefficient power amplifier in the transmitter due to the high peak-to-average power ratio (PAPR) of the multicarrier signal. This paper, presents the main components of LTE-Advanced including the all the details of Uplink (SC-FDMA) and Downlink (OFDMA). Also this paper clarifies the main reasons of using SC-FDMA in uplink and using OFDMA in downlink only, in order to obtain flexible mobile communication technology.DOI: http://dx.doi.org/10.11591/ij-ict.v1i1.55
Analysis Quality of Service from Internet Protocol Television (IPTV) Service
Get PDFIPTV was convergency product between broadcasting, telecommunication and information technology because gave multimedia service such TV broadcasting, video, audio, text, and data that transmitted by using IP protocol. IPTV service had better quality than conventional TV, such as voice over internet protocol (VoIP), data (internet), and video on demand (VoD). This research had purpose to analyze QoS (delay, jitter, MOS and throughput) from IPTV service such as VoIP, internet (HTTP, FTP), and IPTV in the simulation. The QoS resulted from simulation will be compared with standard ITU-T. The result showed bandwidth requirement for downlink and uplink from the services for VoIP 50 kbps, internet 54 kbps, and the IPTV service 6.5 Mbps. The QoS result showed that used bandwidth less than 15 Mbps, resulted jitter and delay that can not tolerated or QoS more than 250 ms and MOS less than 2. The QoS resulted from queue method had applied on the node DSLAM with bandwidth 8 Mbps, only can decreased the value of delay and jitter as 50% - 65% at VoIP and internet services. PQ method became one of the queue method that can be optimalizing of QoS eventhough only decreased the jitter 10%.DOI: http://dx.doi.org/10.11591/ij-ict.v1i2.59
Reduction Techniques of Peak-to-Average Power Ratio in MC-CDMA Systems
Get PDFThe high peak-to-average power ratio (PAPR) is one of the main disadvantages of multicarrier code division multiple access (MC-CDMA) system. To reduce the PAPR of multicarrier CDMA signals, a lot of studies have been focused on the power characteristics of spreading sequences. This paper presents the main techniques to reduce the PAPR in MC-CDMA like Amplitude Clipping and Filtering, Coding, Selective Mapping, The adaptive predistortion technique and DFT Spreading. Then a comparison of all these techniques is done in order to clarify the main advantages and disadvantages of each technique.DOI: http://dx.doi.org/10.11591/ij-ict.v1i2.55