Title :
Low Complexity Blind Frequency Offset Estimation Based on Downsampling for OFDM Systems
Author :
Wang, Huiming ; Yin, Qinye ; Feng, Ang
Author_Institution :
Xi´´an Jiaotong Univ. Xian, Xian
Abstract :
A novel subspace-based blind carrier frequency offset (CFO) estimation approach for orthogonal frequency-division multiplexing (OFDM) systems is proposed. The key observation is that the CFO information is redundant in spectrum structure. By locating null carriers equispaced and remodeling the received blocks through downsampling, we compact parameter space and obtain a low complexity estimator with the performance of high-resolution. Analysis and simulations show the estimator is robust in both AWGN channel and frequency-selective channel.
Keywords :
AWGN channels; OFDM modulation; AWGN channel; OFDM systems; blind frequency offset estimation; carrier frequency offset; downsampling; frequency-selective channel; low complexity estimator; orthogonal frequency-division multiplexing; AWGN channels; Analytical models; Computational modeling; Frequency division multiplexing; Frequency estimation; Frequency response; Maximum likelihood estimation; OFDM; Robustness; Time domain analysis;
Conference_Titel :
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-1042-2
Electronic_ISBN :
978-1-4244-1043-9
DOI :
10.1109/GLOCOM.2007.536
