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Compromise between Guarg Interval and Orthogonality in OFDM Transmission

B. M. Yassine, D. Fatima, and B. F. Tarik
University of Tlemcen, Department of Electrical and Electronic Engineering, Algeria
Abstract—Transmission of higher rates on frequency selective channels is nowadays a challenge. The multi-carrier modulations can made a good way to achieve the desired rates on this type of channels. Based on the simultaneous transmission of user data on a plurality of subcarriers modulated narrowband multiplexing, they allow, by increasing for each carrier symbol duration beyond the channel impulse response, to minimize IES. The frequency selective channel can thus be considered as non- selective for each of the sub -carriers. However, a major drawback was the spectra of different carriers that are necessarily disjoint, what caused decreased spectral efficiency. To reduce the frequency band occupied, the spectrum of sub-carriers must cover each other while trying to reduce or eliminate the interference between subcarriers. To compensate for this loss, optimization of the occupied band is introduced by a partial recovery of the spectra of different subcarriers. Conditions of orthogonally between the subcarriers has been demonstrated leading to possible recovery of their respective spectra.
 
Index Terms—ISI, ICI, FDM, OFDM, DFT, IFFI, FFT, CP, CS, ZF

Cite: B. M. Yassine, D. Fatima, and B. F. Tarik, "Compromise between Guarg Interval and Orthogonality in OFDM Transmission," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 2, pp. 129-133, April 2015. doi: 10.12720/ijeee.3.2.129-133
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