OFDM-based schemes for next generation wireless systems

Kodheli, Oltjon (2016) OFDM-based schemes for next generation wireless systems. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria elettronica [LM-DM270]
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Abstract

The purpose of this study is to investigate two candidate waveforms for next generation wireless systems, filtered Orthogonal Frequency Division Multiplexing (f-OFDM) and Unified Filtered Multi-Carrier (UFMC). The evaluation is done based on the power spectral density analysis of the signal and performance measurements in synchronous and asynchronous transmission. In f-OFDM we implement a soft truncated filter with length 1/3 of OFDM symbol. In UFMC we use the Dolph-Chebyshev filter, limited to the length of zero padding (ZP). The simulation results demonstrates that both waveforms have a better spectral behaviour compared with conventional OFDM. However, the induced inter-symbol interference (ISI) caused by the filter in f-OFDM, and the inter-carrier interference (ICI) induced in UFMC due to cyclic prefix (CP) reduction , should be kept under control. In addition, in a synchronous transmission case with ideal parameters, f-OFDM and UFMC appear to have similar performance with OFDM. When carrier frequency offset (CFO) is imposed in the transmission, UFMC outperforms OFDM and f-OFDM.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Kodheli, Oltjon
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Curriculum: Electronics and communication science and technology
Ordinamento Cds
DM270
Parole chiave
OFDM,f-OFDM,UFMC,waveform,modulation,sub-carrier,spectrum,CFO,performance
Data di discussione della Tesi
7 Ottobre 2016
URI

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