Title :
Frequency offset estimation with ambiguity of symbol timing offset for IEEE 802.16D OFDM system
Author :
Qi, Z.R. ; Zhang, H. ; Qiu, X. ; Chen, J.
Author_Institution :
Inst. of Microelectron., Chinese Acad. of Sci., Beijing, China
Abstract :
This paper presents a frequency synchronization scheme for OFDM mode in the IEEE 802.16d standard. Estimation range of fractional frequency offset (FFO) is derived based on the preamble structure. A novel algorithm with double sliding windows detection (DSWD) is proposed for integer frequency offset (IFO) estimation. The main idea behind this algorithm is to find the boundary of the data carriers and virtual carrers (VC) and calculate the energy ratio of the two consecutive sliding windows. Due to this feature, DSWD algorithm has the immunity to the ambiguity of symbol timing offset. Simulation results are assessed in terms of estimated frequency offset, probability of false alarm and bit-error-rate (BER) performance, which illustrate the efficiency of our proposed algorithm in the OFDM receiver.
Keywords :
IEEE standards; OFDM modulation; error statistics; frequency estimation; IEEE 802.16d standard; OFDM system; bit-error-rate; double sliding windows detection; fractional frequency offset estimation; frequency synchronization scheme; integer frequency offset estimation; symbol timing offset; Baseband; Digital filters; Digital video broadcasting; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; OFDM; Phase estimation; Timing; Wireless LAN;
Conference_Titel :
Global Mobile Congress 2009
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-5302-3
Electronic_ISBN :
978-1-4244-5301-6
DOI :
10.1109/GMC.2009.5295872
