Advanced Engineering Research

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Authors: Sophonwit Somchai, Jirun Potinakkha, Nararat Ruangchaijatupon, V. Prasertchareonsuk, M. Leeprakobboon, J. Jongudomkan, Setthapong Malisuwan, Apirat Siritaratiwat
Abstract: This paper shows the feasibility analysis of the 4th generation (4G) telecommunication system on 800-900 MHz spectrum. It applies the Long-Term Evolution (LTE) wireless communication and makes a feasibility design of cell site placement. An academic community is selected as a studied site because the high usage of advanced communication technologies. Due to the variety of population density, age, and gender, Khon Kaen University is chosen. This paper also suggests the model for cell site installation and cell site positions in Khon Kaen University area.
Authors: Kunagorn Kunavut
Abstract: Due to the physical constraint in offshore territory, cell placement to the certain location is not always possible. Because it requires high telecommunication tower or tall building/platform to avoid the curvation of the earth in order to communicate with the distant Customer Premises Equipment (CPE) terminals. Hence, applying the concept of cellular network design to cover all service area in offshore territory without outage area or coverage gap is very difficult to be achieved. Hence, the typical frequency reuse with omni-directional cells in cellular networks is not much practical in this area. In addition, using omni-directional cells can incur lower capacity and shorter transmission range compared to the sectored cells. In this work, efficient frequency reuse is considered in only sectored cells. With proper network design in terms of transmission direction and power, it can guarantee that there is much fewer or possibly no interference among sectors or cells.
Authors: Adisak Pattanajakr, Apirat Siritaratiwat, Anan Kruesubthaworn
Abstract: This paper presents distribution and automation radio broadcasting organization that is operated by international radio stations such as Voice of America (VOA) using the control center that must rely on the cost of the electrical and electronic instruments and the operation and must be very high dependency computer technology that is relative to clock and must be done regularly to ensure the accuracy. The changing schedule of automation radio broadcasting controlled by programmable logic controller, PLC [1] and the master clock [2] is time in second is required to execute the PLC program for every changing of the schedule program. The ideology of silence of sound signal (Audio Mute) is used when each program ends instead using the master clock to execute the PLC program for changing the schedule radio program. The application of audio mute for changing new schedule when each program ends can be compared with the using the master clock controlling the PLC will be also minimum deviation of the time that will impact on automation radio broadcasting.
Authors: Puttipong Sornplaeng, Poompat Saengudomlert, Lunchakorn Wuttisittikulkij
Abstract: We consider the problem of routing and rate assignment with p-cycle protection for mixed line rate (MLR) networks that are limited by transmission reaches. The problem is formulated mathematically as integer linear programming (ILP) problems under two different assumptions. First, we consider using each p-cycle to protect working lightpaths at common fixed line rate, and refers to this case as the fixed cycle rate (FCR) approach. We then perform comparative study between the FCR approach and the mixed cycle rate (MCR) approach, which is the second case and allows each p-cycle to protect working lightpaths with various rates. The objective of each ILP problem is to minimize the overall cost function, which consists of transponder operating cost, as primary costs and p-cycle operating costs, as secondary costs. Number results show that the MCR approach yields lower cost and is more efficient as the traffic increase when compared the FCR approach. In addition, we compare the use of MLR networks to the use of single line rate (SLR) networks to verify that MLR networks yield lower costs.
Authors: Sarun Duangsuwan, Sathaporn Promwong
Abstract: The constant modulus algorithm (CMA) is an unsupervised adaptive filter that achieves interference cancellation in multiple input multiple output (MIMO) communication systems. This paper studies the performance weighted of CMA algorithm based on the measuring data of MIMO channel. By analyzing both the asymptotic mean square error (MSE) and bit error rate (BER) of the efficient weighted channel of the CMA algorithm, also simulation and measurement results are compared with a different of the antenna orientation. Experimental results demonstrate that the CMA algorithm can reduce the MSE and BER at 2.45 GHz for wireless RFID system very well.
Authors: Raghuraman Selvaraju, Muhammad Ramlee Kamarudin, Mohsen Khalily, Mohd Haizal Jamaluddin, Jamal Nasir
Abstract: A Multi Input Multi Output (MIMO) Rectangular Dielectric Resonator Antenna (RDRA) for 1.8 GHz Long Term Evolution (LTE) applications is investigated and presented. The antenna consisting of two rectangular dielectric resonator elements, both resonators are fed by microstrip feed line is etched on FR4 substrate. The simulated impedance bandwidth for port1 and port2 is 26.38% (1.6176-2.1093 GHz) and 26.80% (1.6146-2.1143GHz) respectively for |S11| ≤ -6dB, which can operate on LTE band 1-4,9,10,35-37 and 39. The gain of the MIMO RDRA is 3.2 dBi and 3.1 dBi at 1.8 GHz for port 1and port 2, respectively. The S-parameters, isolation, gain, and MIMO performance such as correlation coefficient and diversity gain of the presented RDR Antenna have been studied.
Authors: Amira Abd Rohim, Muhammad Ramlee Kamarudin, M.T. Ali
Abstract: A microstrip patch antenna for RFID reader is presented in this paper. It operates within the RFID international UHF band (902-928MHz) which the center frequency is at 915MHz with 15dB of return loss value. The frequency ranges also cover the RFID UHF band for Malaysia (912-923MHz). The main objective for this antenna is to implement it in the RFID reader for an auto payment application. Some results have been shown between CST Microwave Studio, HFSS and the measurement. Good agreement is achieved for the used in the RFID UHF band.
Authors: Siti Nor Hafizah Sa’don, Muhammad Ramlee Kamarudin
Abstract: The characteristics of transparent antenna for indoor television reception are investigated. It operates at Ultra High Frequency (UHF) band. The proposed antenna was made from silver coated polyester film (AgHT-4), the transparent conductive material and it is attached on a layer of glass substrate at both sides. The overall antenna length and width is at 150 mm x 50 mm. It has not fully ground plane and fed by a 50 Ω feedline. The meander line is designed at the feedline to broader the bandwidth. The simulated bandwidth obtained is 505.37 MHz to 802.45 MHz at level -6 dB. The rough impedance bandwidth is 297.08 MHz or 45.43 %. All the radiation patterns over the UHF band show bi-directional for E-plane and omni-directional at H-plane. The maximum gain obtained is 1.88 dBi.
Authors: Nakhon Muangboonma, Nattakan Puttarak, Phisan Kaewprapha
Abstract: The multicast wireless network, where a source needs to deliver packets of data to a set of destination through a group of relays over a network topology, is degraded by a limited bandwidth and capacity regime. Network throughput can be improved using network coding. However, the network coding might or might not be helpful to increase throughput due to an unpredictable network topology. In this paper, we propose an adaptive network coding-routing (ANCR) algorithm to automatically select whether a packet can construct a network code at a relay node before forwarding to destination or not based on the minor of network graphs. If there is no an appropriate packet, the relay will forward a data packet using routing protocol. The results show that this technique can significantly improve both throughput and timeslot usage. The throughput gain at a bottleneck relay node is increased by 35%, while the timeslot usage is decreased for more than 30%.

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