Patent Number: 6,298,098

Title: Burst demodulator for use in high speed bidirectional digital cable transmission system

Abstract: A hybrid fiber/coax digital data transmission system in which data from a plurality of subscribers are transmitted upstream to a headend demodulator in a series of data bursts. The headend demodulator acquires and synchronizes a data burst by detecting a BPSK preamble having a repetitive one and zero pattern (10101010101000). The pattern is detected by integrating clock energy in an envelope of a preamble length transmission and using the last three symbols (0,0,0) as a frame marker after differential decoding. Noise in the system is periodically measured by detecting an empty burst placed periodically in the data stream. A first-in, first-out (FIFO) memory allows closer spacing for the data bursts by permitting asynchronous received and output clocks.

Inventors: Krasner; Norman F. (San Carlos, CA), Edwards; Allen Ponsford (Palo Alto, CA), Xenakis; William G. (Pleasanton, CA), Currivan; Bruce J. (Los Altos, CA)

Assignee: Intel Corporation

International Classification: H04L 7/04 (20060101); H04L 025/10 (); H04L 027/06 ()

Expiration Date: 10/02/2018