The implementation of OFDM transmitters typically consists of a discrete DFT matrix and a digital-to-analog (DAC) converter. Many existing results on the analysis of OFDM systems, e.g., spectral roll-off, are based on a convenient analog representation. In this paper, we show that the analog representation and the DFT-based OFDM transmitters are equivalent only in special cases. Using the analo...

The term electronegativity .was introduced by Linus Pauling, who characterized on the basis ofthermodynamic data from the energies of the single bonds. In present study, the Density Functional Theory(DFT) was used to calculate electronegativity of atoms. The base of calculation is similar to Pauling andMulliken methods. The results indicate that the largest value of electronegativity for Fluori...