FEATURES OF THE OFTDM-TECHNOLOGY OF DATA TRANSMISSION

Abstract

The features of OFDM/QAM and OFDM/OQAM (OFTDM) modulation, their strengths and
weaknesses and areas of their practical application are considered. The basic approaches and methods used
in digital communication systems to suppress the intersymbol and interchannel interference in terms of
additive interference are presented. A development and application of OFTDM information transfer
technology based on generalized orthogonal basis of Weyl-Heisenberg that minimizes the level of mutual
influence of subcarrier channels both in frequency and in the time domain are offered. In calculations the
discrete Hartley transform is used instead of the discrete Fourier transform.
The study showed that the use of OFTDM technology instead of OFDM technology in channels with
variable time division allows to:
– increase the spectral and energy efficiency of system by organizing intersymbol time consolidations.
Another advantage is the good location of base functions in the frequency domain. Spectrum of OFTDM
symbol has rapidly falling tails so low external bandpass emission, which significantly reduces requirements
for filtering the output signal transmitter and reduces the required number of protective "zero" subcarriers
within the frequency domain. Freed subcarriers can be used for the transmission of useful information;
– significantly reduce external bandpass emission, and thereby to ease the requirements for output filter
of the transmitter and for the protective interval within frequency domain. Another advantage is the system
stability (robustness) to intersymbol and interchannel interference within each OFTDM character.
Obtained results showed that OFTDM technology with the Hartley transformation core can speed up
data transmission rate twice and reduce the number of hardware multipliers and adders in the modulator
and demodulator.

Author Biography

Андрій Едуардович Брянський, Odessa National Polytechnic University

Assistant of the Department of radio and telecommunication systems, Odesa National Polytechnic University

Published
2017-05-10
How to Cite
Брянський, А. (2017). FEATURES OF THE OFTDM-TECHNOLOGY OF DATA TRANSMISSION. Electrotechnic and Computer Systems, (25(101), 324-331. https://doi.org/10.15276/eltecs.25.101.2017.38
Section
Computer Systems, Networks and their Components