Digital symbol timing recovery network

Details Digital symbol timing recovery network Digital symbol timing recovery network

1999-07-09

2001-08-14

Pham, Chi (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S321000

Reexamination Certificate

active

06275554

ABSTRACT:

FIELD OF THE INVENTION
This invention concerns a digital symbol timing recovery network.
BACKGROUND OF THE INVENTION
The recovery of data from modulated signals conveying digital information in symbol form usually requires three functions at a receiver: timing recovery for symbol synchronization, carrier recovery (frequency demodulation to baseband), and channel equalization. Timing recovery is a process by which a receiver clock (timebase) is synchronized to a transmitter clock. This permits a received signal to be sampled at optimum points in time to reduce slicing errors associated with decision-directed processing of received symbol values. Carrier recovery is a process by which a received RF signal, after being frequency down converted to a lower intermediate frequency passband (eg., near baseband), is frequency shifted to baseband to permit recovery of the modulating baseband information. Adaptive channel equalization is a process by which the effects of changing conditions and disturbances in the signal transmission channel are compensated for. This process typically employs filters that remove amplitude and phase distortions resulting from frequency dependent time variant characteristics of the transmission channel.
SUMMARY OF THE INVENTION
In accordance with the principles of the present invention, symbol timing recovery is enhanced by coaction of a symbol timing recovery network with a segment sync detector which responds to an output signal from a local channel equalizer.


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