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Throughtput investigated of coexistence Wi-Fi and LTE-U
(2019-11-01)
Moungnoul, Phichet
;
A-Mapat, Narongchon
Implementation of the mobile network provider to improve the network performance and the resources optimization by implemented coexistence LTE-TDD, LTE-FDD network and Wi-Fi technology. The main interference is the adjacent cell interference (ACI) from coexisting network/technology, which affected to the network performance. This paper is investigated LTE/Wi-Fi technique in coexistence LTE-FDD/TDD. Results show the distance between 50-60 m and Wi-Fi access point should not over 12 given the best system. The throughput compared with normal case will describe in this paper.
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Comparative analysis of radio propagation models for LTE network on the sky train
(2019-04-29)
Dataesatu, Arif
;
Boonsrimuang, Pornpawit
;
Mori, Kazuo
;
Boonsrimuang, Pisit
The usage of smartphones and computer for the data communications have become a more integrated part of everyday life for a large majority of the population. One important mode of transportation is the sky train, and users increasingly expect to be able to communicate satisfyingly while traveling on the train: MRT (Mass Rapid Transit Authority of Thailand). However, the radio conditions inside a train are very complex. A possibly large number of users that use at the same time, moving at high speed and a special environment on elevated guideways (height 20 m) are created big challenges for the data communication in LTE network. The accuracy of the path loss model is a very important tool to design the coverage areas and improve the performance in LTE network. This paper that studies and improve the accuracy of the path loss model, which use to design the coverage area of the LTE network under the sky train environment. Normally the radio propagation models under the urban area are designed on the ground approximately 1-3 meters in height but are not suitable for the user in the sky train, which is 20 meters high. we propose the Ericsson urban model in the special environment as sky train by the new values for a0 from 36.2 to 47.2 and a1 from 30.2 to 14.2. The proposed new coefficient for Ericsson urban model shows the most accurate path loss under the sky train with the urban area. The filed measurement is used by the smartphone-based measurement for low cost and practical usage.
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Multiband Antenna for RF Energy Harvesting
(2018-07-02)
Nguyen, Ngan
;
Tuan, Ninh Nguyen
;
Nguyen, Quoc Cuong
;
Truong, Vu Bang Giang
;
Krairiksh, Monai
This paper presents a multi resonant bow-tie slot antenna for Rectifying Antenna in Ambient RF Energy Harvesting (RFEH). The proposed antenna operates at five frequencies 0.9 GHz, 1.8 GHz, 2.1 GHz, 2.45 GHz and 5.8 GHz corresponding with ambient RF sources in our environment bychanging the position and size of the air gap on the traditional bow-tie antenna as well as bow-tie antenna. A good agreement is observed between the simulation and measurement results. The proposedantenna is suitable for high efficiency RF energy harvesting system.
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Optimization of 4G LTE Network in Thailand
(2018-07-02)
Phutcharoen, Kanyanee
;
Promwong, Sathaporn
In this paper present how evaluate the results of optimization of fourth-generation long term evolution network in Thailand. The investigated area is North of Thailand. The power level of received reference signal in the selected area is measured by Nemo outdoor. The measurement results are used to optimization of empirical models for correct prediction of in long term evolution network. Comparison of the results obtained by empirical models before and after tuning is made.
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Optimization of 4G LTE Network in Thailand
(2018-07-02)
Phutcharoen, Kanyanee
;
Promwong, Sathaporn
In this paper present how evaluate the results of optimization of fourth-generation long term evolution network in Thailand. The investigated area is North of Thailand. The power level of received reference signal in the selected area is measured by Nemo outdoor. The measurement results are used to optimization of empirical models for correct prediction of in long term evolution network. Comparison of the results obtained by empirical models before and after tuning is made.
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The optimum ring ratio of 16-APSK in LTE uplink over nonlinear system
(2014-01-01)
Chayratsami, Pornpimon
;
Thuaykaew, Sorapong
Single Carrier Frequency Division Multiple Access (SC-FDMA) has been selected for use in the Long Term Evolution (LTE) uplink due to its lower Peak-to-Average Power Ratio (PAPR) relative to OFDMA The resultant lower PAPR results in fewer excursions into the amplifier's nonlinear region, where signal distortion can occur and results in degraded bit error rate (BER). The SC-FDMA scheme normally applies 16-ary Quadrature Amplitude Modulation (16-QAM), but amplitude phase shift keying (APSK) modulation has a lower PAPR than does 16-QAM, resulting in improved BER This paper investigates the constellation ring ratio of the 16-APSK modulation scheme and its effects on BER through its effects on the PAPR. Simulation results are used to conclude that a ring ratio that ranges from 2.5 to 3.5 delivers the best results and provides BER and PAPR improvement. © 2014 Global IT Research Institute (GIRI).

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