Title :
Modified orthogonal pilot scheme for Carrier Frequency Offset estimation in 2×2 MIMO system
Author :
Promsuwanna, N. ; Uthansakul, P. ; Uthansakul, M.
Author_Institution :
Sch. of Telecommun. Eng., Suranaree Univ. of Technol., Nakhonratchasima, Thailand
Abstract :
The emerging of OFDM technique applied on MIMO systems to improve signal quality and capacity has recently gained a lot of attention. The Carrier Frequency Offset (CFO) due to time-varying fading channel is the main cause of the loss of orthogonality among OFDM subcarriers which is linked to inter-carrier interference (ICI). Hence, it is necessary to precisely estimate and compensate the CFO. Especially for data-aid transmission, CFO also has to be correctly estimated in order to track the channel and frequency synchronization. In this paper, we present the new pilot scheme which reduces the effect of data-interference to pilot tone by modifying the orthogonal pilot pattern. The results show that our proposed scheme provides better system performance by reducing the variance of CFO error.
Keywords :
MIMO communication; OFDM modulation; channel estimation; fading channels; intercarrier interference; synchronisation; time-varying channels; CFO error; MIMO system; OFDM subcarriers; carrier frequency offset estimation; channel track; data-aid transmission; data-interference; frequency synchronization; intercarrier interference; modified orthogonal pilot scheme; orthogonality loss; signal capacity; signal quality; system performance; time-varying fading channel; Channel estimation; Estimation; Frequency estimation; MIMO; OFDM; Receiving antennas; Transmitting antennas; CFO; MIMO; OFDM; channel estimation; orthogonal pilot;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
