Performance evaluation of Wi‐Fi and WiMAX over OFDM physical layer

Abstract

Orthogonal frequency division multiplexing (OFDM) is an alternative technology that is constrained to keep up with the increasingly high data transmission rate due to its robustness against selective frequency fading and its resistance to intersymbol interference (ISI). This paper aims to study and optimize its performance, namely, its probability of communication failure and signal-tointerference-plus-noise ratio (SINR) metrics. The mathematical tool used to perform OFDM evaluation and analysis is the Fourier transform and its properties. The obtained results of those equations led to the demonstration of the probability of communication outage and to notice that the cutoff time occurs after the 10th iteration for values of λ less than or equal to 1. It could also be checked that this period is small if λ exceeds 1 by considering the sensitivity factor. Moreover, for the obtained results, in terms of bit error rate (BER) and SINR, the influence of the modulation on the error vector magnitude (EVM) shows the sensitivity factor Ω presents a key role in the transmission chain.

Exploiting WiMAX for covert transmission of secret data over fading channel

“…Fittingly, discrete wavelet transform (DWT) is employed as opposed to fast Fourier transform (FFT) in the OFDM system . Wang et al compared the performances of FFT‐OFDM and DWT‐OFDM in power line communication and reveled that DWT‐OFDM perform better compared with FFT‐OFDM, whereas the supremacy of DWT over FFT in visible light communication is investigated by Zhou et al Papa Ndiaga Ba et al presents the performance of the optimal 802.11a and the IEEE 802.16e over the OFDM physical layer. The outcomes attained on this study reveal the value of the new generation mobile network of Wi‐Fi and WiMAX.…”