Extraction of an exact symbol rate as applied to bandwidth compr

Details Extraction of an exact symbol rate as applied to bandwidth compr Extraction of an exact symbol rate as applied to bandwidth compr

1990-09-27

1992-06-16

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375 4, 370 84, H04L 2300

Patent

active

051230330

ABSTRACT:
An original symbol rate of a transmitted modem signal which has been demodulated for digital transmission is recovered at a network receiver by obtaining an estimate of error between the original transmitted symbol rate and a known nominal symbol rate. This is realized at the network receiver by measuring an interval between blocks of data in a received signal having other than a known nominal number of data bits. This is achieved because each of the blocks of data is of a known fixed interval. The measured interval is proportional to the desired error estimate. The error estimate is then integrated and employed in an interpolator to adjust the symbol rate of a remodulated modem signal at the network receiver.

REFERENCES:
patent: 3534264 (1970-10-01), Blasbalg et al.
patent: 3993952 (1976-11-01), Roza
patent: 4761797 (1988-08-01), Bickers
patent: 4807257 (1989-02-01), Immink et al.
patent: 4815137 (1989-03-01), Benvenuto
patent: 4821286 (1989-04-01), Grackyk et al.
patent: 4887280 (1989-12-01), Reisenfeld

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