Azlina Idris

Universiti Teknologi MARA | UiTM · Faculty of Electrical Engineering

In construction projects, safety is a big issue. There is not an effective option to overcome the situation. The safety of the public is jeopardized during the construction process. Some incidents happen when people fall from great heights and go unreported, resulting in death due to a lack of medical assistance. However, the numbers of deaths coul...

In the past, a password was required to identify someone. Passwords are becoming obsolete because they can be easily cracked and used to access accounts. Passwords have been replaced with biometrics because they offer more security and are more difficult to hack. Biometric facial recognition is widely employed in our environment. An individual can...

Energy efficiency is essential in mobile communication networks. High Peak-Average Power Ratio (PAPR) has been an inherent drawback of Orthogonal Frequency Division Multiplexing (OFDM) for decades. The peak value of power signals causes two serious problems where it reduces the power efficiency of Radio Frequency (RF) amplifier and increases the co...

The rising demand of 5G technology in the year 2020 has a priority to provide high-speed user capacity with minimum probability of error (noise interference) in wireless communication services. The 5G system model should deploy a unique channel coding technique so-called the enhancement asymmetric arithmetic coding (EAAC) to compress the data and g...

A compact 5G technology can be defined as a system which consist of high signal data transmission, maximizing frequency diversity and can combat noise interference. By theory, it is significantly to improve system’s performance in order to obtain better voice quality, tolerance to noise interference, excellent spectral efficiency, higher network ca...

WiMAX physical layer implemented Orthogonal Frequency Division Multiple Access (OFDMA) as one of the medium to conduct data transmission. OFDMA suffers from Intersymbol Interference (ISI) which can distort efficiency of the signal transmitted. ISI emerges in the system because of multipath. Basic Cascaded Least Square (CLS) with Decision Feedback E...

OFDMA is a multiuser of digital modulation technique used to increase wireless transmission rate. As a one of promising technique, OFDMA still suffer from a few types of interference especially ISI. ISI is an interference that occurs due to the multipath propagation and can distort signal efficiency. Upgraded Cascaded Least Square (CLS) with Decisi...

To date, Non-Orthogonal Multiple Access (NOMA) is the best and most compatible technique to support for the incoming Fifth Generation (5G). However, the NOMA performance is affected by noise, interference and poor signal strength during transmission. Channel coding is required to correct transmission errors due to error propagation, Therefore, chan...

span>One of the key issues for those involved in farming and greenhouse is the use of pesticides. In a recent headline, there has been an epidemic of insect infestation that has destroyed 211 hectares of rice plants. These concerns have led to the discussion of possible over-use of pesticides that are not just killing dangerous pests, but also othe...

With the rapid development of today’s communication technology, the need for a system capable to improve spectral efficiency, high data rates and at the same time can reduce inter-symbol interference (ISI) is necessary. Orthogonal Frequency Division Multiplexing (OFDM) meet all the requirements needed. However, the high peak to average power ratio...

span>This paper presents a design of 3D modeling of Multimode and Single Mode Fiber using SolidWorks. Fiber technology is essential that presents optical fiber is the fastest optical cable laid by Internet Service Providers in network communication. The current design of both fibers has less detail animation on technical specifications of light pro...

DVB-T2 (Digital Video Broadcasting-Second Generation Terrestrial) is one of the latest technical standards being developed by the DVB Project for DTT (Digital Terrestrial Television). It is also known as digital broadcasting trough terrestrial system since 2006 and is an extension of the DVB-T system as a second generation program to improve effici...

This paper proposes an enhance version of the dual parameter based cost function algorithm for time-varying environments. For ideal channel condition, the proposed cost function algorithm adaptively changes the transmission data rate according to traffic load condition. However, similar approach is not well-suited for time-varying environment. For...

Normally, cell-edged users in wireless networks experience a low Signal-to-Interference-Noise-Ratio (SINR). This problem results in low signal strength and causes a bad performance for the overall system. Moreover, the small cell capacity and cell coverage will occur at the cell-edge. To support high data services and applications, it is required a...

The rising demand of the future 5th generation (5G) wireless systems has led to the development of wireless communication technologies that can provide higher user capacity. Therefore, filtered orthogonal frequency division multiple access (F-OFDMA) was introduced to accommodate large number of users. F-OFDMA has the advantage over OFDM since it is...

This paper presents a research on electric power monitoring prototype mobile applications development on energy consumptions in a university campus. Electric power energy consumptions always are the issue of monitoring usage especially in a broad environment. University campus faces high used of electric power, thus crucial analysis on cause of the...

Filtered orthogonal frequency division multiplexing (F-OFDM) was introduced to overcome the high side lobes in the OFDM system. Filtering is implemented in the system to reduce the out-of-band emission (OOBE) for the spectrum utilization and to meet the diversified expectation of the upcoming 5G networks. The main drawback in the system is the high...

The growing demands for wireless communication services pose new challenges in the coming generation of cellular networks design. In Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) networks, ever-higher data rate and energy efficiency are required to meet the increasing demands in cellular traffic. This paper proposed an effic...

The multiple-input-multiple-output (MIMO) concept and orthogonal frequency division multiple access (OFDMA) combination has been perceived as the most auspicious system to attain high transmission data rate and mitigate inter-symbol interference (ISI). However, high peak-to-average power ratio (PAPR) in OFDMA causes non-linearity at the receiving...

The combination of MIMO and OFDM gives a very attractive option for high data rate communication in wireless communication system over frequency selective fading. However, MIMO-OFDM also inherent the PAPR problem from OFDM system. We proposed our SCS technique and modified SLM technique to be applied in diversity MIMO-OFDM system for PAPR and BER p...

High Peak-to-Average Power Ratio (PAPR) is known to be an unavoidable problem in Orthogonal Frequency Division Multiplexing (OFDM). In this paper, a modified Selective Mapping (SLM) to minimize the high PAPR in OFDM system with low computational complexity is proposed. This technique utilizes the Circulant Shift Codeword technique to the convention...

One of the challenges issue in Orthogonal Frequency Division Multiple Access (OFDMA) is the interference of the system, which is the inter-symbol interference (ISI) and inter-carrier interference (ICI) is being considered. So that, in this paper the interference alignment scheme together with the implementation of the Minimum Mean Square Error (MMS...

Orthogonal frequency division multiple access (OFDMA) become one of the modulation technique that significant to enhance wireless system performance. But in typical urban environment, data rate performance degrading due to the Inter symbol interference (ISI). Multipath propagation is one of the reasons that can cause ISI during transmission. In ord...

Energy efficiency is essential in mobile communication networks. High Peak-Average Power Ratio (PAPR) has been an inherent drawback of Orthogonal Frequency Division Multiplexing (OFDM) for decades. The peak value of power signals causes two serious problems where it reduces the power efficiency of Radio Frequency (RF) amplifier and increases the co...

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 subcarri...

Peak to Average Power Ratio (PAPR) has been known to be a common problem in Orthogonal Frequency Division Multiplexing (OFDM). The peak value of power signals has contributed to other problems, thus the implementation of OFDM system in many wireless applications has been growing slowly. There are many techniques being discussed to reduce the PAPR i...

Higher demand in rapid data transmission makes the wireless technology become more popular in this new modern era. However due to the many users that want to have access in the same time, it can cause congested traffic and affect the data rate. OFDMA modulation scheme with combination of MIMO will support high data signal and become one of the best...

Multiple Input Multiple Output (MIMO) system has been brought a great improvement in spectral efficiency and the system capacity by serving multiple users simultaneously. The mathematical model of downlink Multi-user MIMO system and its capacity has been presented as well as different precoded transmission schemes. It is to implementing the downlin...

Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in various high data rate wireless communications standards. The high peak-to-average power ratio (PAPR) has however been known to be a constant problem in OFDM systems. The high PAPR in the OFDM system has led to many problems such as signal distortion, energy spilling to the a...

Selective Mapping (SLM) is a well-known technique used in OFDM System to reduce high Peak-Average Power Ratio (PAPR). High PAPR occurred during signal processing which multiple data are converted into electromagnetic signal via Inverse Fast Fourier transform (IFFT) at the transmitter. Even though SLM technique has a potential to reduce high PAPR, i...

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 publish...

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 po...

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 syst...

MIMO-OFDMA (Multiple Input Multiple Output-Orthogonal Frequency Division Multiple Access) resource allocation is studied in this paper. The considered problem is to provide each user with more data rates in wireless communication system by using the suitable value of bandwidth. The objective of this research is to focus on how to improve the data r...

Channel estimation techniques for Multiple-input Multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) based on comb type pilot arrangement with least-square error (LSE) estimator was investigated with space-time-frequency (STF) diversity implementation. The frequency offset in OFDM effected its performance. This was mitigated with...

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...

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 o...

Orthogonal frequency division multiple access (OFDMA) is one of the modulation technique designed to have high speed data rate transmission in wireless communication system. Inter symbol interference (ISI) is a main cause that can reduce efficiency of the system due to multipath propagation. Different equalization of adaptive algorithm technique ha...

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...

The objective of this research is to propose a new data conjugate sub carrier mapping technique that combines ICI self cancellation method using data allocation in space-time-frequency block codes (STFBC) MIMO-OFDM system. It aims to achieve maximum diversity order and to compensate integrated effect of FO for ICI reduction in the system. Using the...

This paper highlights the simulation using cyclic codes in order to identify the effect of two types of noise which are additive white Gaussian noise and multipath Rayleigh fading to a communication system. The main objective is to know which communication channel is better, a communication channel with AWGN or a communication channel with multipat...