Comparison of Orthogonal Transforms for OFDM Communication System

Electronics and Electrical Engineering 2011
Artūrs Āboltiņš

Classical orthogonal frequency division (OFDM) employs fast Fourier transform (FFT) for elimination of inter-symbol interference (ISI) and expansion of time support of the transmitted signals. However FFT could not always be optimal in terms bit error ratio (BER) due channel variations, Doppler Effect, nonlinearities and high peak-to-average power ratio of the signal. Aim of this publication is to experimentally compare different orthogonal transforms and outline impact of these transforms on BER of the communication system with noisy, frequency selective and nonlinear communication channels. Simulation results of OFDM communication systems with equalization and no transform, with FFT, Hadamard and Generalized nonsinusoidal orthogonal transforms are presented. Ill. 5, bibl. 9, tabl. 1 (in English; abstracts in English and Lithuanian).

Keywords
Discrete Fourier transforms, signals, interference, nonlinerities, transforms, simulation, adaptive equalizers
DOI
10.5755/j01.eee.111.5.361
Hyperlink
http://www.eejournal.ktu.lt/index.php/elt/article/view/361

Āboltiņš, A. Comparison of Orthogonal Transforms for OFDM Communication System. Electronics and Electrical Engineering, 2011, Vol.111, No.5, pp.77-80. ISSN 1392-1215. e-ISSN 2029-5731. Available from: doi:10.5755/j01.eee.111.5.361

Publication language
English (en)