Title :
A simple feedforward timing offsets estimation algorithm for BPSK/QPSK
Author :
Deng, Yongjun ; Yang, Zhixing ; Guo, Xinbo
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
fDate :
29 Aug.-1 Sept. 2004
Abstract :
It has usually been used under feedback (FB) mode since Gardner timing-error detection algorithm (GTDA) was proposed. In this paper, GTDA is applied to the feedforward (FF) mode and its performance in this case has been investigated. A simple and effective feedforward timing offsets estimation algorithm for BPSK/QPSK is proposed based on T/4 spaced sampling and GTDA. Combining the coarse estimation with fine estimation and using linear function to approximate the central segment of GTDA around its zero point, the algorithm can be applied in both data-aided (DA) mode and decision-directed (DD) mode at low SNR. Simulation results are compared with the lower bound CRLBDA under DA mode and the lower bound modified CRB (MCRB) under DD mode.
Keywords :
error detection; estimation theory; feedforward; quadrature phase shift keying; synchronisation; BPSK; Gardner timing-error detection algorithm; QPSK; SNR; binary phase shift keying; data-aided mode; decision-directed mode; feedback mode; feedforward timing offsets estimation algorithm; linear function; quadrature phase shift keying; signal-to-noise ratio; AWGN; Binary phase shift keying; Demodulation; Feedback; Linear approximation; Matched filters; Pulse shaping methods; Quadrature phase shift keying; Sampling methods; Timing;
Conference_Titel :
Communications, 2004 and the 5th International Symposium on Multi-Dimensional Mobile Communications Proceedings. The 2004 Joint Conference of the 10th Asia-Pacific Conference on
Print_ISBN :
0-7803-8601-9
DOI :
10.1109/APCC.2004.1391684
