An alternative blind feedforward symbol timing estimator using two samples per symbol

• Published in: IEEE transactions on communications Vol. 51; no. 9; pp. 1451 - 1455
• Main Authors: Yan Wang, Serpedin, E., Ciblat, P.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-09-2003; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymptotic properties; Bandwidth; Blinds; Computational complexity; Computer simulation; Estimators; Frequency synchronization; Performance analysis; Pulse modulation; Pulse shaping methods; Quadrature amplitude modulation; Samples; Sampling methods; Statistical analysis; Statistical methods; Symbols; Time measurements; Timing
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2003.816976

Recently, S.J. Lee proposed a blind feedforward symbol timing estimator that exhibits low computational complexity and requires only two samples per symbol (see IEEE Commun. Lett., vol.6, p.205-7, 2002). We analyze Lee's estimator rigorously by exploiting efficiently the cyclostationary statistics present in the received oversampled signal; its asymptotic (large sample) bias and mean-square error (MSE) are derived in closed-form expression. A new blind feedforward timing estimator that requires only two samples per symbol and presents the same computational complexity as Lee's estimator is proposed. It is shown that the proposed new estimator is asymptotically unbiased and exhibits smaller MSE than Lee's estimator. Computer simulations are presented to illustrate the performance of the proposed new estimator with respect to Lee's estimator and existing conventional estimators.