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Classic OFDM Systems and Pulse Shaping OFDM/OQAM Systems
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.ORCID iD: 0000-0002-9709-0713
KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
2007 (English)Report (Other academic)
Abstract [en]

In this report, we provide a comparative study of state-of-the-art in Orthogonal Frequency Division Multiplexing (OFDM) techniques with orthonormal analysis and synthesis basis. Two main categories, OFDM/QAM which adopts base-band Quadrature Amplitude Modulation (QAM) and rectangular pulse shape, and OFDM/OQAM which uses baseband offset QAM and various pulse shapes, are intensively reviewed. OFDM/QAM can provide high data rate communication and effectively remove intersymbol interference (ISI) by employing guard interval, which costs a loss of spectral efficiency and increases power consumption. Meanwhile it remains very sensitive to frequency offset which causes inter-carrier interference (ICI). In order to achieve better spectral efficiency and reducing combined ISI/ICI, OFDM/OQAM using well designed pulses with proper Time Frequency Localization (TFL) is of great interest. Various prototype functions, such as rectangular, half cosine, Isotropic Orthogonal Transfer Algorithm (IOTA) function and Extended Gaussian Functions (EGF) are discussed and simulation results are provided to illustrate the TFL properties by the ambiguity function and the interference function.

Place, publisher, year, edition, pages
, TRITA-ICT/ECS R, ISSN 1653-7238 ; 07:01
Keyword [en]
OFDM, OQAM, IOTA, time-frequency localization
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-44796ISRN: KTH/ICT/ECS/R-07/01-SEOAI: diva2:451451
NGFDM - small project of Wireless@KTH
QC 20111026 A hard copy is available in ICT/ECS archive. Electronic copy is available on from: 2011-10-26 Created: 2011-10-25 Last updated: 2011-11-30Bibliographically approved

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