Fast symbol synchronization for use in conditioning a receiving

Details Fast symbol synchronization for use in conditioning a receiving Fast symbol synchronization for use in conditioning a receiving

1994-03-09

1996-07-30

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375222, 370 32, H04L 706, H04L 516

Patent

active

055419674

ABSTRACT:
Modems at ends of a transmission line are synchronized with each other by a training procedure which initiates each of a plurality of communication sessions occurring while a connection between the modems is established. The initial communication session begins with a long training sequence. Ensuing communication sessions utilize a time-saving short training sequence which includes the following. A coarse timing algorithm establishes synchronization on a symbol boundary from two alternating elements transmitted in accordance with a standard and of which a plurality of amplitude samples are taken. A fine timing algorithm then quickly finds the peak point of the symbol so that the sampling instance can be adjusted accordingly. This is accomplished by identifying, which sample of an element represents the maximum amplitude between the elements. A comparison is made between the identified sample and its preceding one for that element, and the identified sample and its succeeding one for that element. The sampling instance is shifted based on such comparison to thereby adjust the synchronization.

REFERENCES:
patent: 4852124 (1989-07-01), Raucci
V. 29 FAX modem on the NS32FX16 (Almagor et al), International Conference on DSP Applications and Technology (Oct. 28-31, 1991).
Meeting of Working Parties of Study Group XVII (Geneva, Oct. 16-25, 1991).
National Semiconductor Corporation Manual on System Controller (Jun. 1992).
9600 Bits Per Second Modem Standardized for Use on Point-To-Point 4-Wire Leased Telephone-Type Circuits (Geneva 1976; amended at Geneva 1980, Malaga-Torremolinos, 1984).

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