Journal of Applied Engineering & Technology (JAET) <p>Journal of Applied Engineering &amp; Technology (JAET) is an international, bi-annual peer-reviewed, open access scientific journal that publishes <u>free of charge</u> manuscripts. JAET journal is based on the Open Journal System (OJS). JAET follows the Gold route open access model. JAET offers publications based on innovative applications, the development of new technologies and efficient solutions in various areas of engineering, computing, and technology. JAET publishes research papers with substantial results based on experimental, theoretical, and numerical work and review papers only to maintain the quality of the journal.</p> <p>JAET targets mainly researchers from Engineering, Technology, and Computer relevant fields as the audience. However, we also welcome individuals and groups from both academia and industry to publish their quality work with us.</p> <p>Print ISSN: 2523-6032</p> <p>Online ISSN: 2523-2924</p> Synergy Research Club (SMC-PVT) LTD. Pakistan en-US Journal of Applied Engineering & Technology (JAET) 2523-6032 Fast Multiplication Approach Using a Tree-Based Structure <p>This paper presents a technique for an efficient and faster integer number multiplication in the literature<br>using a tree-based structure. In the proposed method, both the generation of the partial products and the addition of<br>partial products are completed in the tree structure. The proposed multiplication approach has been designed in two<br>steps: Firstly, the partial products are generated in a tree-based structure; Secondly, diagonal partial products<br>additions have been done by the partial products residing in the diagonal partial product nodes to get a faster<br>multiplication result. The result analysis shows that the proposed multiplication algorithm outperforms the existing<br>techniques in the literature; e.g., the proposed 4×4 multiplication algorithm improves 50% on the worst case<br>running time complexity over the best known existing ones.</p> Md. Solaiman Mia Copyright (c) 2020 Journal of Applied Engineering & Technology (JAET) 2020-06-30 2020-06-30 4 1 1 10 Tunable Pulse Amplitude and Position Modulation Scheme <p>In optical communication applications, there are always trade offs between system performance and costs. Therefore, there is need to design a modulation technique to prevent this problem in terms of their power and bandwidth requirements. Basic technique such as On Off Keying (OOK), Pulse Amplitude Modulation (PAM) and Pulse Position Modulation (PPM) have been validated as suitable for the optical wireless channel. The method employ amplitude and position modulation technique, a guaranteed system performance can be secured, without compromising power and bandwidth. The example model will stabilize the Bit Error Rate (BER). However, a latest modulation technique which is combining L-level pulse-position modulation (L-PPM) and L-level pulse-width modulation (L-PWM) which have a relatively low bit error rate and improved power and bandwidth efficiencies is the better hybrid modulation compared to the Pulse Amplitude and Position Modulation. Extensive simulations using a Matlab will be carried out to validate this two technique.</p> Nur Hazwani Binti Ramlee Copyright (c) 2020 Journal of Applied Engineering & Technology (JAET) 2020-06-30 2020-06-30 4 1 11 19 Interior Wireless Channel Design and Performance Analysis <p>Infrared light for indoor wireless communications has received considerable attention recently. Unfortunately infrared are more susceptible to shadowing or noise source and have stringent alignment requirements. However, a reliable communication can be made possible by the design of transceiver, which in turn depends on designer’s knowledge on the propagation properties at infrared frequency and characterized infrared channel by measurements. The objective of this work, is to setup an indoor wireless infrared communication system, based on the Line of Sight (LOS) transmission link using a laser diode as the transmitter device and a photodiode as the receiver device. The main purpose of this setup is to determine the best channel characterization for an optical wireless communication by varying the parameters such as receiver bandwidth and transmission distance. This work is divided into two parts. The first part is to design and stimulate a transimpedance amplifier receiver with bandwidth adjustment capabilities using Multisim. The stimulation results shows that by varying the designed transimpedance amplifier receiver bandwidth, produces a cutoff frequency range between 10MHz to 100MHz while the gain remains at 15dB. Optsim is used to determine the eyediagram, bit error rate and the Q factor of the optical wireless system when the transmission distance is varied. The stimulated results shows that as the distance increase, the bit error rate decreased. The second part of this work is to setup the experimental system. The experimental measurement shows that the maximum transmission distance is 4m. As the distance increased, the transmitted signal becomes distorted due to ambient noise. The measured gain at 0m is -4.8dB, compared to the stimulated gain has a difference of 19.8dB.<br><br></p> Lim Jun M.F.L Abdullah Copyright (c) 2020 Journal of Applied Engineering & Technology (JAET) 2020-06-30 2020-06-30 4 1 20 28