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Zainul Abadin, A. F. M.
- Downlink Scheduling in Long Term Evolution
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Affiliations
1 Department of Information and Communication Engineering, Pabna University of Science & Technology, IN
1 Department of Information and Communication Engineering, Pabna University of Science & Technology, IN
Source
International Journal of Engineering Research, Vol 4, No 6 (2015), Pagination: 277-281Abstract
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.- Methodology to Achieve Enhanced Data Transmission Rate using Li-Fi in VLC Technology
Abstract Views :101 |
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Authors
Affiliations
1 Dept. of Information and Communication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
1 Dept. of Information and Communication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
Source
International Journal of Engineering Research, Vol 3, No 12 (2014), Pagination: 803-806Abstract
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.- Performance Evaluation of a Space Time Trellis Coded MIMO-OFDM Wireless Communication System
Abstract Views :108 |
PDF Views:0
Authors
Affiliations
1 Department of Information and Communication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
2 Department of Electronic and Telecommunication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
1 Department of Information and Communication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
2 Department of Electronic and Telecommunication Engineering, Pabna University of Science & Technology, Pabna-6600, BD
Source
International Journal of Scientific Engineering and Technology, Vol 2, No 12 (2013), Pagination: 1229-1233Abstract
In wireless communication systems, popularly known as MIMO (Multiple-Input Multiple-Output) technology, the use of multiple antennas at the transmitter and receiver has rapidly gained in popularity over the past decade due to its powerful performance-enhancing capabilities. This research incorporates a comprehensive BER simulation study undertaken on the effectiveness of a Space-Time Trellis Coded multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) communication system. The STTC encoded MIMO-OFDM Communication system under present study has integrated two digital modulation schemes (QAM, QPSK) over fading (Rayleigh and Rician) and Additive White Gaussian Noise (AWGN) channels for two transmitting and two receiving antennas. Minimum Mean-Square-Error (MMSE) channel equalization algorithm has been implemented here. Computer simulations are performed with synthetically generated data from audio signal and the results on bit error rate (BER) reveals that the MIMO-OFDM system with STTC coding under QAM modulation technique is highly effective to combat inherent interferences under Rayleigh, Rician fading and Additive White Gaussian Noise (AWGN) channels. It is projected from the study that the retrieving performance of the communication system degrades with the lowering of the signal to noise ratio (SNR).Keywords
Space–Time Trellis Coding (STTC), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), Minimum Mean-Square-Error (MMSE) Channel Equalization, Additive White Gaussian Noise (AWGN), PCM Encoder.- PWM Based Android Controlled Wheelchair
Abstract Views :237 |
PDF Views:112
Authors
Affiliations
1 Department of Information and Communication Engineering, Pabna University of Science and Technology, Pabna, BD
1 Department of Information and Communication Engineering, Pabna University of Science and Technology, Pabna, BD
Source
AIRCC's International Journal of Computer Science and Information Technology, Vol 10, No 2 (2018), Pagination: 57-64Abstract
Most of the physically disable individual satisfies their movement through motorized wheelchair. The scenario is unusual for the disables of developing countries because of their economic conditions. Moreover traditional powered wheelchair is not comfortable to all segments of the disable society because of their complexity. Several researchers have used sophisticated technologies to operate wheelchair such as voice controlled, head gesture controlled, remote controlled wheelchair for providing better flexibility. For being sophisticated technology Android is being used in mobile, TV or in smart watches.An app with mitigating required controlling facilities is implemented here that may provide a flexible movement of the certain disable community. This paper focuses on the system of PWM based Android Controlled Wheelchair.Keywords
Wheelchair, Microcontroller, Android Phone, Bluetooth, Assistive Technologies and PWM.References
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