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Cooperative MIMO OFDM system based on Amplify and Forward Relay: Evaluation of ZF-SIC and MMSE-SIC equalization

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Rahman M. , Alam S. , Islam S. , Samy A. A. , Islam N. A.

2018

tom R. 94, nr 9

75--79

In the world of wireless communication, cooperative communication is a modern and unprecedented approach which enables wireless nodes to transfer the information in a cooperative manner and finally to reach the destination without least possible deterioration. Orthogonal frequency division multiplexing (OFDM) can provide high data rate and better performance and a combination of OFDM and cooperative communication may push a wireless network forward to its next generation with enhanced reliability and efficiency. In this work, we develop a mathematical model for cooperative multiple input multiple output (MIMO) OFDM system. Results are achieved in the study to evaluate and compare bit error rate (BER) for different detection schemes. Based on the results it can be mentioned that the performance of cooperative MIMO-OFDM with space time block code (STBC) under amplify and forward (AF) relay for the MMSE-SIC detection scheme was found very satisfactory with improved signal to noise ratio (SNR).

W artykule przedstawiono model matematyczny kooperacyjnej komunikacji bezprzewodowej wiele wejść, wiele wyjść (MIMO) z multipleksingiem i ortogonalnym podziałem częstotliwości (OFDM). Określono współczynnik BER (bit error rate) dla różnych metod detekcji. Najlepsze parametry otrzymano dla systemu STBC (space time block code).

Personal hygiene assessment among different university students of Dhaka, Bangladesh: a step towards the prevention of COVID-19 pandemic

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Rahman S. , Alam S. , Wafa U. S. , Gofur M. W. , Rashid I. , Islam S. , Mehedi A. A.

World Scientific News

2020

tom 147

Characterization of phosphorus in fresh and composted manures of different Livestock

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Faridullah F. , Hafeez S. , Ahmed T. , Alam S. , Naz A. , Shah W. , Khalid S.

Polish Journal of Environmental Studies

2018

tom 27

nr 2

The characterization of phosphorous (P) from animal manure is important for sustainable nutrient management. P fractions in fresh and composted animal manure was compared for the release of phosphorous fraction to determine heavy metals (Fe, Zn, Mn, Ni, and Hg). Composted and fresh animal manure were collected from four different sources: buffalo (BF), cow (CW), goat (GT), and poultry (PL). The P fraction was determined by using the Hadley sequential fractionation method. The P was step-wise fractionated into water-soluble extracted P (H₂O-P), plant available (NaHCO₃-P), Al associated (NaOH-P), and Ca associated (HCl-P). The overall P fractions extracted by reagents varied in the order HCl > NaOH > NaHCO₃ > H₂O. The metal concentration varied as follows: Fe > Hg > Mn > Zn > Ni. The highest P content was found in composted PL manure whereas the minimum was observed in fresh PL. Consequently, the composed animal manure could be an economical P source to be used as fertilizer.

Spectroscopic characterization of the interactions of bovine serum albumin with medicinally important metal ions: platinum (IV), iridium (III) and iron (II)

86%

Alhazmi H. A. , Bratty M. A. , Meraya A. M. , Najmi A. , Alam S. , Javed S. A. , Ahsan W.

tom 68

nr 1