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- 저자 : Salmanzadeh, Ali Mohammed (검색결과 2 건)
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A Modified Method Based on the Discrete Sliding Norm Transform to Reduce the PAPR in OFDM Systems
R. Salmanzadeh,Mozaffari Tazehkand 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1
Orthogonal frequency division multiplexing (OFDM) isa modulation technique that allows the transmission ofhigh data rates over wideband radio channels subject tofrequency selective fading by dividing the data into severalnarrowband and flat fading channels. OFDM has highspectral efficiency and channel robustness. However, amajor drawback of OFDM is that the peak-to-averagepower ratio (PAPR) of the transmitted signals is high,which causes nonlinear distortion in the received data andreduces the efficiency of the high power amplifier in thetransmitter. The most straightforward method to solvethis problem is to use a nonlinear mapping algorithm totransform the signal into a new signal that has a smallerPAPR. One of the latest nonlinear methods proposed toreduce the PAPR is the L2-by-3 algorithm, which is basedon the discrete sliding norm transform. In this paper, anew algorithm based on the L2-by-3 method is proposed. The proposed method is very simple and has a lowcomplexity analysis. Simulation results show that theproposed method performs better, has better powerspectral density, and is less sensitive to the modulationtype and number of subcarriers than L2-by-3.
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Dadfarnia, Shayessteh,Salmanzadeh, Ali Mohammed,Haji Shabani, Ali Mohammed Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.12
1,5-diphenylcarbazone was immobilized on sodium dodecyl sulfate coated alumina. The alumina particle was effectively used for collection of mercury(II) and methylmercury cations at sub-ppb level. The adsorbed mercury was eluted with l mol $L^{-1}$ of hydrobromic acid solution. The mercury(II) was then directly measured by cold vapor atomic absorption spectrometry utilizing tin (II) chloride where as the total mercury was determined after the oxidation of methylmercury into the inorganic mercury. The methylmercury concentration was calculated by the difference between the value of total mercury and mercury (II). Mercury (II) and methylmercury cations were completely recovered from water with a preconcentration factor of 100 (for 1 L solution.) Relative standard deviation at Hg L ${\mu}gL^{-1}$ level 1.7%(n=8) and the limit of detection was 0.11 ${\mu}gL^{-1}$. The procedure was applied to spring water, well water and seawater and accuracy was assessed through recovery experiments.
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