The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presented an enhanced of SINR based on serving and neighboring path loss to mitigate co-channel interference by using DSSS technique in LTE-Wi-Fi network. The proposed technique is the continuity from the earlier work which enhanced the DSSS with new coefficient: chip rate coefficient and radius fraction coefficient. The earlier works only consider its serving BS for path losses values...
Orthogonal frequency division multiple access (OFDMA) is broadly used in wireless communication system such as Mobile WiMAX and LTE. It is simply because of efficient usage of bandwidth, simple receiver and multiuser diversity. However, its major drawback is vulnerability to frequency offset (FO) which can wipe out the orthogonality of the subcarriers. This will lead to inter-carrier interference...
Finding the optimization of power allocation of subcarrier is always a challenge in MIMO-OFDMA schemes in order to maximize the capacity of the system. Resources allocation is process how set of network is decide in wireless system. This research is to study restriction of proportional rate and total power among user in MIMO-OFDMA scheme and the power allocation and capacity of subcarrier in the scheme...
In this rapidly modernizing era, haze or air pollution is one of the many serious global problems for the entire population in the world. Air pollutant index (API) reading increases as haze gets worse, affecting school and aircraft schedule on top of causing respiratory problem. However, there have been occasions in Malaysia where API level published by Department of Environment (DoE) does not change...
Peak to Average Power Ratio (PAPR) is known to be a traditional problem in Orthogonal Frequency Division Multiplexing (OFDM). The peak value of power signals bring to many other problems, thus the implementation of OFDM system in many wireless applications are growing slowly. There are many techniques have been discussed to reduce PAPR in OFDM systems and one of them is PAPR reduction through coding...
This paper presents the implementation of Alamouti's scheme on Polarizone's Field Programmable Gate Array (FPGA)-based software defined radio platform and also to conduct experiment with RF transmission. A 16-QAM encoder is implemented in this project successfully. The system manages to encode incoming data to Alamouti codes by performing baseband signal processing and schedule its timing according...
In the polling-based WiMAX network, the number of served mobile station (MSs) and number of polls (NOP) are the parameters that significantly affects the network performance. Both factors had an impact even on basic the service and arrival rate plays a role in the performance. In this paper, we present the performance analysis of throughput based on the Mobile Multi-hop Relay (MMR) WiMAX. We modelled...
Retailers and consumers alike will face a time when they are uncertainty about a particular product since product identity replication being abused everywhere since barcodes is the only way to determine the original details of a product which can easily be forged. However, the introduction of new technology in security enforcement for product which is RFID called Radio Frequency Identification that...
Worldwide Interoperability for Microwave Access or better known as WiMAX is an air-interface standard in accordance with the IEEE 802.16. Mobile WiMAX or IEEE 802.16e standard defines five different service classes which can be used to satisfy the VoIP QoS. In this study, different trajectory is applied to the MS with the encoder of G.711 and G.729 in order to identify which encoder gives the best...
MIMO-OFDM is known for its novelty and capability for higher data rate transmission and has been an effective multicarrier transmission technique over frequency selective channels. However, its vulnerability to frequency offset (FO), has wiped out the orthogonality of the subcarriers and lead to inter-carrier interference (ICI) which degrades the system performance. The system performance will also...
Multiple-input multiple-output (MIMO) technology and Orthogonal Frequency Division Multiplexing (OFDM) combinations provide robust to multipath delay and high data rates in wireless communication. The wireless connection of fast moving platforms leads to high demands for the applied transmission scheme. Therefore, a channel estimation technique using fast time-varying channel is proposed in this paper...
Video streaming is the real time delivery process of video to the user's media player services. In multimedia streaming technique, the user can access data while it is being transferred. To meet the demand of providing high-quality of video streaming, it is important to design suitable QoS model. Hence, in this project, we designed around streaming services using an Internet topology on expected video...
Channel estimation is a one of important technique to improve the performance of Orthogonal Frequency Division Multiplexing (OFDM), and the Decision-Directed (DD) channel estimation is focus on this paper because of the ability of decreasing bit error rate (BER) in the OFDM performance. Decision-Directed channel estimation based on least square error (LSE) was suggested, and it is conducted in the...
In the latest development of Orthogonal Frequency Division Multiplexing (OFDM) communication system, the system performance can be distracted by the frequency offsets (FOs) which can demolish the orthogonality of the subcarriers, increases the inter-carrier interference (ICI) and intensely deteriorate the system performance. As a result, Intercarrier Interference Self-Cancellation (ICI-SC) has been...
This research presents the TEC value based on location of the receivers in Malaysia. Many research group in several countries done their research in VRS concept, algorithm, performance, accuracy and method of transmitting the correction to the rover. This is because VRS has become most popular solution in network RTK which symbolizes the new stage of precise GPS positioning. The target is to calculate...
Tweek atmospherics are ELF/VLF pulse signals with frequency dispersion characteristics generate from lightning discharges and spread in the Earth-ionosphere waveguide mode. This study uses the electromagnetic wave approach describe as ELF (extremely low frequency) and VLF (very low frequency) which propagates sub-ionospherically among the earth and the lowest ionosphere. This paper presents the nighttime...
Nowadays the demand for cellular mobile phone has grown rapidly. If the cellular user population is increase there is a need to maximize the number of subscriber in the system. To achieve the goals of maximizing network capacity, hierarchical topology cell is being studied. In this hierarchical topology cell, femtocell is overlaid over the macrocell to handle overflow calls. Mobile subscriber is divided...
The research on observation of equatorial plasma bubbles (EPBs) ionospheric at peninsular Malaysia by using Malaysian Real Time Kinematic Global Positioning System Network (MyRTKnet). Plasma bubbles which usually occur during midnight. This determination is made for satellites in Peninsular Malaysia in the September period of 2007 at Universiti Utara Malaysia (UUMK) and Sungai Petani (SGPT). The important...
This paper to mitigate the Ionospheric Scintillation effect during solar flare happen on 7th June 2011. This scintillation data recorded by dual-frequency GPS Receiver, GPS ionospheric scintillation and TEC monitored (GISTM) at UKM, Malaysia (2.55°N, 101.46°E). Parameters on this study will focus on the amplitude scintillation in between 18:00 LT until 00:00 LT; 06:00 pm to 12:00 am. Observation showed...
This project emphasizes on the detection of the occurrence of ground Ultra Low Frequency (ULF) signal prior to earthquake events. In recent years, many publications have been published indicating that electromagnetic observations in low frequency ranges may be used as precursors to earthquakes. The ULF frequency band (0.001–10 Hz) is considered as the most promising frequency range in ground based...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.