Title :
High speed pilot-less sampling frequency acquisition for OFDM systems
Author :
Chang, Ching-Chi ; Wang, Chomg-Kuang
Author_Institution :
Graduate Inst. of Electron. Eng., National Taiwan Univ., Taipei, Taiwan
Abstract :
This paper presents a sampling frequency offset estimation in time domain for orthogonal frequency division multiplexing (OFDM) systems. Cyclic prefix (CP) enables the estimation without pilots. The proposed algorithm realizes sampling frequency estimation on each sample within the last period where the CP copied from. The sampling-rate iteration method markedly improves acquisition speed and jitter performances. Simulations show that this method can synchronize OFDM systems in both AWGN and indoor multipath delay spread channels. Practical examples of IEEE 802.11a are used to illustrate results.
Keywords :
AWGN; IEEE standards; OFDM modulation; frequency estimation; iterative methods; multipath channels; signal sampling; time-domain analysis; AWGN; CP; IEEE 802.11a; OFDM system; cyclic prefix; high speed sampling frequency acquisition; multipath delay spread channels; orthogonal frequency division multiplexing; pilot-less sampling frequency acquisition; sampling frequency offset estimation; sampling-rate iteration method; time domain; AWGN; Bandwidth; Clocks; Frequency estimation; Frequency synchronization; Jitter; OFDM modulation; Phase locked loops; Sampling methods; Timing;
Conference_Titel :
VLSI Design, Automation and Test, 2005. (VLSI-TSA-DAT). 2005 IEEE VLSI-TSA International Symposium on
Print_ISBN :
0-7803-9060-1
DOI :
10.1109/VDAT.2005.1500029
