Timing tracking in communications systems

Details Timing tracking in communications systems Timing tracking in communications systems

1996-07-23

1998-11-03

Tse, Young T.

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375326, H04L 700

Patent

active

058320466

ABSTRACT:
In a TDMA cellular communications system, optimal sampling of symbols in an information sequence is maintained by a method of timing tracking in which, recursively, indirect variables of a linear complex vector are estimated from received samples and previous estimates of the indirect variables, the sampling delay, and a complex fading factor, and the complex fading factor and the sampling delay are estimated by non-linear transformations of the estimated indirect variables. The timing tracking follows a timing recovery process which produces initial estimates. An implementation of the method uses a Kalman filter having constant filter gains and a transformation of the received samples and sampling delay to a reduced time interval.

REFERENCES:
patent: 5199047 (1993-03-01), Koch
patent: 5432816 (1995-07-01), Gozzo
patent: 5440588 (1995-08-01), Murakami
patent: 5654989 (1997-08-01), Gurney et al.
patent: 5694440 (1997-12-01), Kallman et al.
patent: 5710792 (1998-01-01), Fukawa et al.

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