Title :
Pilot based synchronization in OFDM systems using maximum likelihood estimation
Author_Institution :
Appl. Res. Group, Satyam Comput. Services Limited, Bangalore, India
Abstract :
Orthogonal frequency division multiplexing (OFDM) based communication systems are very efficient in combating inter-symbol interference (ISI) in frequency-selective channels. However, carrier frequency offset (CFO) severely affects system performance by destroying the orthogonality between the OFDM subcarriers. In this paper, we estimate the CFO in a block OFDM system using maximum-likelihood estimation (MLE) and pilot subcarriers. Through simulations, we then show the deleterious effect of the CFO on the bit error rate (BER) and subsequently, the performance improvement after CFO compensation.
Keywords :
OFDM modulation; channel estimation; error statistics; intersymbol interference; maximum likelihood estimation; synchronisation; BER; OFDM systems; bit error rate; carrier frequency offset; frequency-selective channels; intersymbol interference; maximum likelihood estimation; orthogonal frequency division multiplexing; pilot based synchronization; Bit error rate; Fading; Frequency estimation; Frequency synchronization; Intersymbol interference; Maximum likelihood estimation; OFDM; Quadrature amplitude modulation; System performance; Wireless LAN;
Conference_Titel :
Networks, 2005. Jointly held with the 2005 IEEE 7th Malaysia International Conference on Communication., 2005 13th IEEE International Conference on
Print_ISBN :
1-4244-0000-7
DOI :
10.1109/ICON.2005.1635573
