Title :
Wireless OFDM-OQAM with a Small Number of Subcarriers
Author :
Garbo, Giovanni ; Mangione, Stefano ; Maniscalco, Vincenzo
Author_Institution :
Univ. degli Studi di Palermo, Palermo
fDate :
March 31 2008-April 3 2008
Abstract :
Orthogonal frequency division multiplexing based on offset quadrature amplitude modulation (OFDM-OQAM) is a multicarrier signaling technique which trades off robustness for spectral efficiency when compared to conventional OFDM with a cyclic prefix. In this paper, a novel matrix model for passband OFDM-OQAM signaling with a small number of subcarriers over a multipath frequency selective fading channel is presented. Specifically, in OFDM-OQAM a frequency selective channel is divided into many smaller but still frequency selective overlapping channels, so approximating the frequency response of a subchannel by the channel frequency response sampled at the subcarrier frequency may be inadequate. Channel effects may be better characterized if the frequency response of each subchannel is represented as a Taylor expansion at the subcarrier frequency. Simulation results show how the matrix model implemented by means of this approximation is a suitable model for OFDM-OQAM with a small number of subcarriers.
Keywords :
OFDM modulation; fading channels; frequency response; multipath channels; quadrature amplitude modulation; spectral analysis; wireless sensor networks; Taylor expansion; channel frequency response; matrix model; multicarrier modulation; multicarrier signaling; multipath frequency selective fading channel; offset quadrature amplitude modulation; orthogonal frequency division multiplexing; passband signaling; spectral efficiency; subcarrier frequency; wireless OFDM-OQAM; Chirp modulation; Communications Society; Fading; Frequency conversion; Frequency response; Interchannel interference; OFDM; Passband; Quadrature amplitude modulation; Taylor series;
Conference_Titel :
Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1997-5
DOI :
10.1109/WCNC.2008.38