Title :
Improved joint carrier and sampling frequency offset estimation scheme for OFDM systems
Author :
Lei, Wen ; Cheng, Weiming ; Sun, Liming
Author_Institution :
Dept. of Multimedia Commun., Chinese Acad. of Sci., Beijing, China
Abstract :
We present an improved joint carrier and sampling frequency offset estimation (JCSFOE) scheme for OFDM systems. With adaptive weighted carrier frequency offset estimation and compensation, this improved JCSFOE scheme reduces the sensitivity of sampling frequency offset estimation to the intercarrier interference (ICI) caused by carrier frequency offset. Moreover, by carefully combining estimates from several OFDM preambles, more accurate sampling frequency offset estimation is achieved. Effects of sampling frequency offset and frequency selective fading on the improved JCSFOE scheme are analyzed. Simulation results show that the proposed scheme significantly improves the system performance compared with existing methods.
Keywords :
OFDM modulation; adaptive estimation; fading channels; frequency estimation; multipath channels; radiofrequency interference; signal sampling; time-varying channels; ICI; OFDM systems; carrier frequency offset estimation; fading channels; frequency selective fading; intercarrier interference; joint carrier-sampling frequency offset estimation; multipath channels; time varying channels; AWGN; Degradation; Fading; Frequency estimation; Interference; OFDM; Sampling methods; Sun; System performance; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE
Print_ISBN :
0-7803-7974-8
DOI :
10.1109/GLOCOM.2003.1258648
