A5036316054- graph theory and CDMA systems
- Coding theory and cryptography
- Optical Wireless Communication Technologies
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Wireless Communication Networks Research
- PAPR reduction in OFDM
- Radio Wave Propagation Studies
- Advanced Wireless Communication Techniques
- Adaptive optics and wavefront sensing
- Graph Labeling and Dimension Problems
- Antenna Design and Optimization
- Network Security and Intrusion Detection
- Advanced optical system design
- Image and Signal Denoising Methods
- Energy Harvesting in Wireless Networks
- Satellite Communication Systems
- Powder Metallurgy Techniques and Materials
- Advanced Wireless Communication Technologies
- Multiple Myeloma Research and Treatments
- Electromagnetic Compatibility and Measurements
- Software-Defined Networks and 5G
- Antenna Design and Analysis
- Digital Filter Design and Implementation
Universiti Malaysia Perlis
2015-2024
Manado State University
2019
Universiti Putra Malaysia
2010-2014
In this paper, we present a single photodiode detection (SPD) technique for spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems. The proposed eliminates both phase-induced intensity noise (PIIN) and interference (MAI) in the domain. Analytical results show that 35 simultaneous users transmitting at data rate of 622 Mbps, bit-error (BER) = 1.4x10^-28 SPD is much better compared to 9.3x10^-6 9.6x10^-3 modified-AND as well AND techniques, respectively. Moreover,...
In this paper, we present, several aspects of unipolar optical code-division multiple access (OCDMA) codes, focusing on the flexible in-phase cross-correlation code algorithm and its potential for future networks. We briefly present a new class namely Flexible Cross Correlation (FCC) Spectral-Amplitude Coding (SAC) OCDMA approaches. The main coding properties are reviewed. FCC provides simple tridiagonal matrix constructions compared to other SAC-OCDMA codes such as MDW, MQC MFH codes. This...
VLC (or visible light communication) has grown in popularity recent years. For next-generation communication system upgrades, dependable data transmission is essential. As the number of users increases, so does need for consistent, rapid, and minimally delayed delivery. However, as more consumers demanded higher speeds, errors also increased. The error correction code minimizes overall system's to mitigate this effect. This study examines a design architecture (VLC) that incorporates forward...
Anechoic chambers signal absorption capability is directly correlated to its performance. One of the main components in enabling design and material used designing absorbers. Two types are pyramidal wedge-shaped ones. In this work, truncated wedge absorbers for anechoic chamber application have been designed operate effectively microwave frequencies from 1 - 10 GHz. The were simulated using a fusion carbon-based with different features coating thickness improve their performance significant...
A new family of spectral/spatial spectral amplitude-coding (SAC) optical code division multiple access (OCDMA) scheme using Modified Double Weight (MDW) is developed. The codes are derived from with good cross correlation. This proposed system can suppress the phase-induced intensity noise (PIIN) by multiuser interference (MUI) cancellation property. 2-D OCDMA MDW offer a much larger capacity compare to 1-D Code.
Cleaning-in-place (CIP) of pink guava puree (PGP) fouling deposits is not well known compared to dairy which established. Lab-scale cleaning test rig has been used investigate the performance PGP deposits. Removal mechanism during alkaline-based were investigated using NaOH concentrations (1.0 wt% -2.0 wt%), temperatures (35 - 70 °C) and fluid velocities (0.6-1.5m/s) over a range Reynolds number (Re= 4x104 1.8x105). Cleaning rate was quantified by measuring remaining area at sample holder...
This paper is to provide the preliminary result and activities of a research program at UNIMAP on rain attenuation in Perlis region. The project uses LaserBit product; model LB-2500 LB-5000 which can maximum reach 2500 m 5000 with wavelength 785 nm laser power 70 mW. will utilize four existing measured data compared calculated determine validity precipitation deepen consequence intensity. As additional unwavering measurement. Optisys software has been used simulate predict possibility result.
This paper investigates the performance of direct detection technique for zero cross correlation code in Optical Code Division Multiple Access (OCDMA) which is a better to reduce Multi Interference (MAI). MAI main reason degradation optical CDMA especially when large numbers users are involved. The implementation whereby only pair decoder and detector required as opposed with two pairs AND subtraction technique. OptiSystem Ver.7 has been used simulation on system's performance. It possible...
Abstract Inter-satellite communication is one of the revolutionary techniques that can be used to transmit high speed date between satellites. However, space turbulences such as transmitting pointing errors play a significant role while designing inter-satellite systems. Those cause shutdown link due increase attenuation during data transmission through link. The present work aims develop an integrated system incorporating alternate mark inversion (AMI), wavelength division multiplexing...
Two-dimensional Optical Code Division Multiple Access (2-D OCDMA) has gained great interest among researchers in optical communication systems. This work is aimed to present an alternative way of formulating the spectral/spatial incoherent two-dimensional Extended Enhanced Double Weight Extended-EDW) code. code proposed suppress phase induced intensity noise (PIIN) by using multiple access interference (MAI) cancellation property. The numerical analysis shows that 2-D EDW a better...
The RF communication has suffered from the interference and excessive latency issues. It is required a separated setup for transmission reception of waves. To overcome this problem, VLC system chosen technique due to high bandwidth immunity electromagnetic sources. In project, Optisystem Software version 15 been study perfomances in directed LOS. performance results will be displayed on BER analyser simulation that done iterating continuously order get acceptable results. result indicates...
In this paper we propose a Zero Cross-correlation (ZCC) code in Optical Code Division Multiple Access (OCDMA) CDMA system based on amplitude spectral encoding of low-cost broadband sources such as Light Emitting Diode (LED). We also study how the sliced spectrum LED can be used cost-effective light source ZCC code. Our requires only standard optical elements and simple direct-detection receivers. show that for number weight = 4, up to 100 users transmit asynchronously with an average bit...
Dense wavelength division multiplexing system is a for coupling and transmitting the optical signals at different through single fiber. Such technology important in order to increase capacity communication meet growing demands of bandwidth. However, there are some limiting factors related data rate this system. These can be linear or nonlinear. Theoretically, nonlinearities fiber arise as number channel, transmission length, input power level increase. In project, objective focused towards...