Adaptive timing recovery with gain adjustment

Details Adaptive timing recovery with gain adjustment Adaptive timing recovery with gain adjustment

1994-08-01

1995-09-26

Tse, Young

Pulse or digital communications

Receivers

Automatic gain control

4552341, H04L 2708

Patent

active

054540151

ABSTRACT:
An adaptive timing recovery method and apparatus are disclosed. The present invention reduces the problems in connection with the conventional timing recovery by varying the gain of the band-edge filtering in inverse proportion to the available band-edge energy in the received signal. The non-linearized outputs from the "early-late" filter are first added together and then subtracted from a reference value. A small fraction of the result is subtracted from the filter gains of the two half-symbol-rate filters. Therefore, if the band-edge energy is small, then the sum of the non-linearized outputs is negative and the timing filter gain values are increased. If the band-edge energy is large, then the filter gains will be reduced.

REFERENCES:
patent: 4910467 (1990-03-01), Leitch
patent: 5131009 (1992-07-01), Janer

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