DocumentCode :
2459089
Title :
A Comparison between Coded OFDM/OQAM and CP-OFDM Modulations over Multipath Channels
Author :
Ndo, Gaëtan ; Siohan, Pierre ; Hamon, Marie-Hélène
Author_Institution :
Orange Labs., France Telecom, Cesson Sevigne, France
fYear :
2010
fDate :
6-9 Sept. 2010
Firstpage :
1
Lastpage :
5
Abstract :
Power Line Communications (PLC) are usually subject to severe degradations, partly due to the channel time dispersion. OFDM is a widely used multicarrier modulation scheme (MCM) for such frequency selective channels, because of the simplicity of the required equalization, and also because of its robustness toward Inter Symbol Interference (ISI), thanks to Cyclic Prefix (CP) insertion. However, other MCM schemes such as OFDM/OQAMcan sometimes be preferred to OFDM, for specific reasons, e.g. time or frequency localization. But, unlike CP-OFDM, OFDM/OQAM exhibits extra ISI and Inter-Carrier Interference (ICI) terms. This paper provides a comparison between both modulation schemes, including coding, for transmission cases where these interference terms cannot be neglected. An accurate Log-Likelihood Ratio calculation is derived for OFDM/OQAM in the case of a transmission through a PLC channel being also impaired by an impulsive noise. Simulation results are reported for a double binary turbo code considering two different block lengths.
Keywords :
OFDM modulation; carrier transmission on power lines; cyclic codes; intercarrier interference; multipath channels; quadrature amplitude modulation; CP-OFDM modulation; coded OFDM/OQAM; cyclic prefix insertion; frequency selective channel; intercarrier interference; intersymbol interference; log likelihood ratio calculation; multicarrier modulation; multipath channel; power line communications; Bit error rate; Interference; Modulation; Noise; OFDM; Prototypes; Time frequency analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd
Conference_Location :
Ottawa, ON
ISSN :
1090-3038
Print_ISBN :
978-1-4244-3573-9
Electronic_ISBN :
1090-3038
Type :
conf
DOI :
10.1109/VETECF.2010.5594211
Filename :
5594211
Link To Document :
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