Title :
Carrier Frequency Offset Compensation with Successive Cancellation in Uplink OFDMA Systems
Author :
Yücek, Tevfik ; Arslan, Hüseyin
Author_Institution :
Univ. of South Florida, Tampa
fDate :
10/1/2007 12:00:00 AM
Abstract :
Similar to OFDM systems, OFDMA systems also suffer from frequency mismatches between the receiver and the transmitter. However, the fact that each uplink user has a different frequency offset makes the compensation more challenging than that of OFDM systems. This letter proposes successive interference cancellation (SIC) for compensating the frequency offset in the uplink OFDMA systems. A decorrelator is used to remove the inter-carrier interference (ICI) within a user´s signal and successive cancellation is applied to mitigate the multi access interference (MAI) arising due to the frequency difference among uplink users. The proposed algorithm is shown to eliminate the interference and has a manageable complexity.
Keywords :
OFDM modulation; frequency division multiple access; interference suppression; radio links; radiofrequency interference; carrier frequency offset compensation; decorrelator; multi access interference; successive cancellation; uplink OFDMA system; Discrete Fourier transforms; Frequency domain analysis; Frequency estimation; Frequency synchronization; Interference cancellation; Multiple access interference; OFDM; Signal processing; Signal processing algorithms; Silicon carbide;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2007.060273
