International Journal of Engineering Research

Md. Anwar Hossain ¹, A. F. M. Zainul Abadin ¹

Affiliations
1 Department of Information and Communication Engineering, Pabna University of Science & Technology, IN

Abstract

This is an investigated research article on resource block scheduling of Long Term Evolution (LTE). LTE is one of the evolutions of the Universal Mobile Telecommunication System (UMTS). It provides internet access to mobile users through smart phone, laptop and other android devices. LTE offers a high speed data and multimedia services. It supports data rates up to 100 Mbps in the downlink and 50 Mbps in the uplink transmission. Our research investigation was aim to the downlink scheduling. We have considered The Best CQI scheduling algorithm and the Round Robin scheduling algorithm. The implementation, analysis and comparison of these scheduling algorithms have been performed through MATLAB simulator. We have analyzed the impact of the scheduling schemes on the throughput and the fairness of both scheduling schemes. Here we have proposed a new scheduling algorithm that achieves a compromise between the throughput and the fairness. Orthogonal Frequency Division Multiplexing (OFDM) has been adopted as the downlink transmission scheme. We have considered the impact of the channel delay on the throughput. In addition, MIMO transceiver systems have been implemented to increase the throughput.

Keywords

Long Term Evolution (LTE), Universal Mobile Telecommunication System (UMTS), Best CQI, Round Robin, Orthogonal Frequency Division Multiplexing (OFDM), SISO, MIMO.

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Md. Shahadat Hossain ¹, Md. Samiul Islam ¹, A. F. M. Zainul Abadin ¹, Md. Anwar Hossain ¹

Affiliations
1 Dept. of Information and Communication Engineering, Pabna University of Science & Technology, Pabna-6600, BD

Abstract

Li-Fi (Light Fidelity or optical Wi-Fi) is the transmission of data using light waves by varying the light intensity faster than human eye can follow using Visible Light Communication (VLC) technology in free space. This is just like as "Data Through Illumination". VLC uses rapid pulses of light to transmit information wirelessly. VLC using LEDs is emerging as a key technology for a ubiquitous communication system, because LED has the advantages of fast switching, long life expectancy, being less expensive and being visible light that is safe for the human body. LEDs are different from the other kinds of lamps because they are semiconductors. This characteristic gives them the capability to switch-on and off within few nanoseconds or billionth of a second. Converted in terms of data rates, this corresponds to 1 Gbits/s or more. In order to compare, at best Wi-Fi can reach 100 Mbits/s data rates and so at least 10 times or more lower. Here we shows some new conceptual methods by which we can transmit data in parallel using VLC technology. If this application is put into use, we can use every bulb like a Wi-Fi hot spot to transmit the data with ultra-high speed such as more than 10 Gbits/s.

Keywords

Li-Fi, Visible Light Communication (VLC), Wi-Fi, LED, Radio & Light Spectrum.

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