Title :
A decision-directed symbol timing recovery circuit for ATSC digital TV receivers
Author :
Song, Woo-Jin ; Oak, Sang-Soo ; Lee, Jae-Cheon ; Yoon, Ki-Ryong
Author_Institution :
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea
fDate :
8/1/1999 12:00:00 AM
Abstract :
We present and analyze a full-digital decision-directed symbol timing recovery circuit based on the double-sampling maximum-likelihood estimator. Intended for the ATSC digital TV system, the proposed scheme works independently of the segment synchronization by extracting timing information from the randomized data symbols even in the extremely small roll-off case. With the proposed method we get not only quick synchronization, but also robust timing recovery with reduced timing jitter compared to the conventional correlation method. The simulation is performed using the 8-level PAM signal, and evaluated in terms of the steady-state timing jitter under AWGN and multipath ghost channels. Additionally, initial timing acquisition and segment synchronization performance are also shown
Keywords :
AWGN channels; decision circuits; digital television; maximum likelihood estimation; multipath channels; pulse amplitude modulation; signal sampling; synchronisation; television interference; television receivers; timing jitter; 8-level PAM signal; ATSC digital TV receivers; AWGN channels; correlation method; decision-directed symbol timing recovery circuit; digital circuit; double-sampling maximum-likelihood estimator; multipath ghost channels; randomized data symbols; robust timing recovery; segment synchronization performance; simulation; small roll-off; steady-state timing jitter; timing acquisition performance; timing information extraction; timing jitter reduction; AWGN; Circuits; Correlation; Data mining; Digital TV; Maximum likelihood estimation; Performance evaluation; Robustness; Steady-state; Timing jitter;
Journal_Title :
Consumer Electronics, IEEE Transactions on
