Papers by Rozeha A. Rashid
テレビホワイトスペースを利用した直交周波数分割多重化(OFDM)に基づくビデオ伝送【Powered by NICT】
IEEE Conference Proceedings, 2017
There is a growing emphasis on generic skills as a determinant for a graduate employability. Gene... more There is a growing emphasis on generic skills as a determinant for a graduate employability. Generic skills include among others; analytical reasoning, problem solving, intellectual curiousity and teamwork skills. These latent traits, or referred to as attributes, shall be embedded in the course development to ensure the expected learning outcomes is achieved. Thus, it enhances the employability of graduates who possessed such traits. SEE 3512-Electromagnetic Field Theory (EMT-1) utilized active learning, a type of outcome based education method (OBE), in their course delivery. OBE offers a new perspective to improve students' learning process as compared to the traditional teaching and learning method. It shifts the learning responsibility to the students; hence more active participation from the students in the attempt to develop the required generic skills. This called for a method of measurement to gauge the expected learning outcomes from the students. A Table of Test Specification is developed to meet the objectivity and specificity of the required generic skills conducted through the course assessment to achieve the set quality assurance (QA). Item Characteristic Curve Analysis in the form of difficulty index and discrimination index are used to provide a better measure of students' qualitative achievements. The analysis can serve as a model to establish the students' pre-requisite employability traits to be developed and the construct validity of an examination paper in assessing the said aspects.
Digital Signal Processing, 2017
Compressed Sensing (CS) is challenged by the computational complexity associated with signal reco... more Compressed Sensing (CS) is challenged by the computational complexity associated with signal recovery, especially in applications that involve recovering high-dimensional signals. We present an efficient mechanism based on divide-and-conquer principle for accelerating CS signal recovery with minimal impact on recovery quality. In principle, the proposed mechanism is applicable to any CS recovery algorithm, and achieves linear scaling between recovery time and sensed signal dimension in most cases. In addition to analytic performance guarantees, several numerical experiments were performed to verify the performance of the proposed mechanism. A sample result reports average recovery time improvement by a factor above 50 for recovering a 128 × 128 test image. This mechanism contributes to reducing recovery time, power consumption and the hardware cost required for CS signal recovery.
Machine Learning Bill Prediction for IoT-based Utility Management System
Robust and Fast Algorithm Design for Efficient Wi-Fi Fingerprinting Based Indoor Positioning Systems
Journal of King Saud University - Computer and Information Sciences, Aug 1, 2023
eprints.utm.my
Traffic control and resource management are complex issues in wireless asynchronous transfer mode... more Traffic control and resource management are complex issues in wireless asynchronous transfer mode (WATM) due to broad range quality-of-services (QoS), limited bandwidth spectrum and susceptibility to error. In WATM, traffic control is essential in order to protect the network ...
TelG Mote: a green wireless sensor node platform for smart home and ambient assisted living
Journal of Electronic Science and Technology, 2016
The wireless sensor network (WSN) consists of sensor nodes that interact with each other to colle... more The wireless sensor network (WSN) consists of sensor nodes that interact with each other to collectively monitor environmental or physical conditions at different locations for the intended users. One of its potential deployments is in the form of smart home and ambient assisted living (SHAAL) to measure patients or elderly physiological signals, control home appliances, and monitor home. This paper focuses on the development of a wireless sensor node platform for SHAAL application over WSN which complies with the IEEE 802.15.4 standard and operates in 2.4 GHz ISM (industrial, scientific, and medical) band. The initial stage of SHAAL application development is the design of the wireless sensor node named TelG mote. The main features of TelG mote contributing to the green communications include low power consumption, wearable, flexible, user-friendly, and small sizes. It is then embedded with a self-built operating system named WiseOS to support customized operation. The node can achieve a packet reception rate (PRR) above 80 for a distance of up to 8 m. The designed TelG mote is also comparable with the existing wireless sensor nodes available in the market.
Solar assisted system (SAS) for wireless sensor node
The deployment of Wireless Sensor Network (WSN) for autonomous long-term monitoring of the enviro... more The deployment of Wireless Sensor Network (WSN) for autonomous long-term monitoring of the environment has enabled applications in many diverse areas. However, WSN motes are typically powered by small batteries, which are finite energy sources and normally need periodic maintenance. Therefore, energy harvesting for WSN is a very promising solution for perpetual operations. In this paper, a solar-assisted system (SAS) for WSN is proposed. It is equipped with energy storage system to ensure uncorrupted power supply as well as a battery protection circuit to prolong the lifespan. In conclusion, WSN with SAS will have continuous and maintenance-free more operating time compared to conventional WSN.
Two-hop network design of LoRaWAN with a meta-heuristic optimization algorithm for improving downlinks
Journal of Intelligent and Fuzzy Systems, Jul 2, 2023
Low power wide area networks (LPWANs) are made to survive conditions of extensive installation. T... more Low power wide area networks (LPWANs) are made to survive conditions of extensive installation. Technological innovations, including Global Network Operator, Long Range Wide Area Network (LoRaWAN), Narrowband Internet of Things (NB-IoT), Weightless, Sigfox, etc., have adopted LPWANs. LoRaWAN is currently regarded to be one of the most cutting-edge and intriguing technology for the widespread implementation of the IoT. Although LoRaWAN offers the best features that make it fit with Internet - of - things specifications, there are still certain technical issues to overcome, such as link coordination, resource allocation and reliable transmission. In LoRaWAN, End-devices transmit randomized uplink frames to the gateways using un-slotted random-access protocol. This randomness with the restrictions placed on the gateways is a reason that leads to a considerable decline in network performance, in particular downlink frames. In this paper, we propose a new approach to increase Acknowledgement (ACK) messages throughput. The suggested method takes advantage of both class A and class B features to enhance and assist LoRaWAN’s reliability by ensuring that an ACK message is sent for every confirmed uplink while retaining the minimum energy level that is utilized by nodes.
IEEE802.11 interference management for wireless sensor node
Internet of Things (IoT) had undergone an increasing popularity due to its significant features t... more Internet of Things (IoT) had undergone an increasing popularity due to its significant features that is able to connect devices to the internet. As a result, Wi-FI enabled Wireless Sensor Node gain popularity as an implementation of IoT. To achieve satisfactory quality of service (QoS) for a Wi-FI enabled WSN system, an interference management is one of the most crucial operation. In this paper, a simple yet effective method of IEEE 802.11 interference management method at the physical (PHY) layer is introduced, where it effectively associates the node with the best available Access Point (AP) in the vicinity, ensuring a seamless connectivity to the internet. The selection of AP includes evaluating three criteria: link margin (LM) of APs, channel distance (CD) between adjacent APs, and the probability of detection (Pd) of APsThe results show that the algorithm is a promising solution by ensuring that the system is automatically connected to the best available AP and thus, reducing interference to the minimum.
A systematic literature review on downlink frames in LoRaWAN
Computers and Electrical Engineering
Prinsip kejuruteraan telekomunikasi
Telekomunikasi ialah proses penyampaian maklumat untuk jarak yang jauh, melebihi jarak yang boleh... more Telekomunikasi ialah proses penyampaian maklumat untuk jarak yang jauh, melebihi jarak yang boleh dicapai oleh suara manusia. Sejarah membuktikan manusia asalnya menyalurkan maklumat untuk jarak jauh melalui pelbagai kaedah primitif seperti menggunakan asap, bunyi atau surat sebagai perantara. Era sistem telekomunikasi moden tercetus apabila terciptanya telefon dan berkembang sehingga kepada komunikasi melalui internet. Sehubungan itu, buku ini meneroka prinsip asas sistem telekomunikasi yang merangkumi pemodulatan analog, digit dan kekunci. Konsep asas pemodulatan analog meliputi pemodulatan amplitud dan sudut, analisis isyarat dalam domain masa dan frekuensi, operasi litar penjana dan penerima, dan kesan hingar ke atas sistem pemodulatan. Perbincangan mengenai pemodulatan digit pula mencakupi teknik penukaran isyarat analog kepada digit seperti pemodulatan delta dan pemodulatan kod denyut yang melibatkan proses pensampelan, pengkuantuman dan pengekodan talian. Kaedah pemultipleksan dan pemodulatan kekunci isyarat digit turut disertakan untuk melengkapkan pengetahuan asas kejuruteraan telekomunikasi. Buku ini juga mengandungi contoh dan latihan di akhir setiap bab yang dapat membantu mengukuhkan kefahaman pembaca di samping mampu menjadi bahan rujukan bidang berkaitan.
Optimizing distributed cooperative sensing performance using swarm intelligence
Communications in Computer and Information Science, 2011
... Rozeha A. Rashid, Yacub S. Baguda, N. Fisal, M. Adib Sarijari, SKS Yusof, SHS Ariffin, NMA La... more ... Rozeha A. Rashid, Yacub S. Baguda, N. Fisal, M. Adib Sarijari, SKS Yusof, SHS Ariffin, NMA Latiff, and Alias Mohd ... of different CUs [7]. Cooperative communication technology can considerably improve the sensing efficiency and reliability by facilitating the sharing of sensing ...
Spectrum utilization can be significantly improved by adopting cognitive radio (CR) technology. S... more Spectrum utilization can be significantly improved by adopting cognitive radio (CR) technology. Such radios are able to sense the spectral environment and use this information to opportunistically provide wireless links that meet the user communications requirements optimally. To achieve the goal of cognitive radio, it is a fundamental requirement that the cognitive user (CU) performs spectrum sensing to detect the presence of the primary user (PU) signal before a spectrum is accessed as to avoid harmful interference. Therefore, two probabilities are of interest; the probability of detection, P d and the probability of false alarm, P fa. In this paper, we investigate sensing performance implemented on real-time testbed of GNU Radio and USRP Software Defined Radio (SDR) communication platform operating at 2.48 GHz with a bandwidth of 4 MHz. Energy detector utilizing 1024 FFT bin is the sensing mechanism used in the experimental setup. The acquired experimental results of P d and P fa are duly analyzed and verified to be comparable to the curve of the theoretical framework for line-of-sight indoor environment. It is observed that at a target P fa of 5%, the optimal decision threshold for PU detection is-39 dB. The plot of measured number of samples needed for a desired P d for various received signal levels, representing various signal-to-noise (SNR) conditions, is also included. At SNR of 0 dB and a target Quality of Service (QoS) set at P d of 90%, it is found out that the required sensing time for our GNU Radio USRP based CR system is equal to 31.59ms.
Internet of Things (IoT) technology promotes remote data acquisition and device control across wi... more Internet of Things (IoT) technology promotes remote data acquisition and device control across wireless network infrastructure and is a catalyst for increasing internet-connected applications. This paper presents the development of an IoT based application for a guard touring system (GTS). A traditional GTS lacks real-time functionalities such as data upload, multitasking, summon features as well as competitive pricing. It is proven that the developed IoT based GTS, which consists of an Android application, web browser and cloud database, enables easy deployment and monitoring of guard’s patrolling activities. The performance analysis shows that the accuracy for Global Positioning System (GPS) location tracking has by default a 68% confidence level within a set geo-fencing radius of 25 meters while the end-to-end delay is about one minute over cellular and Wi-Fi networks from a test run within UTM campus.
Journal of Electrical and Computer Engineering, May 31, 2023
Tis project aims to investigate the best machine learning (ML) algorithm for classifying sounds o... more Tis project aims to investigate the best machine learning (ML) algorithm for classifying sounds originating from the environment that were considered noise pollution in smart cities. Sound collection was carried out using necessary sound capture tools, after which ML classifcation models were utilized for sound recognition. Additionally, noise pollution monitoring using Python was conducted to provide accurate results for sixteen diferent types of noise that were collected in sixteen cities in Malaysia. Te numbers on the diagonal represent the correctly classifed noises from the test set. Using these correlation matrices, the F1 score was calculated, and a comparison was performed for all models. Te best model was found to be random forest.
Supervisory mobile application for GuardExpert PRO security management system
5TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC, COMMUNICATION AND CONTROL ENGINEERING (ICEECC 2021)
Lightweight IOT Based Indoor Positioning for Guard Touring System
Lecture notes in electrical engineering, 2022
IoT Based Temperature Control for Smart Mosque
IOP Conference Series: Materials Science and Engineering, 2020
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Papers by Rozeha A. Rashid