Differential correlator for spread spectrum communication system

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04L 102

Patent

active

049641387

ABSTRACT:
A spread spectrum communications system includes an encoder for differentially encoding a spread spectrum spreading code sequence in accordance with an input data signal. Each chip of the spreading code sequence is inverted, or not inverted, relative to the polarity of a corresponding chip of the spreading code sequence a fixed time delay previously, depending on whether the input data is a logic one or zero, respectively. At the receiver, the data is recovered in a differential data decoder wherein the presently received chip of the spread spectrum signal and a corresponding previously received chip of spread spectrum signal, received a fixed time delay previously, are compared one chip at a time. Since it is the spreading code sequence that is differentially encoded and differentially decoded, there is no need for a synchronized code sequence generator at the receiver, and data synchronization is achieved after one cycle time of the received spread spectrum spreading code sequence has elapsed.

REFERENCES:
patent: 3337803 (1967-08-01), Costas et al.
patent: 3864635 (1975-04-01), Ewanus
patent: 3917999 (1975-11-01), Gutleber
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4214209 (1980-07-01), Baier et al.
patent: 4291409 (1981-09-01), Weinberg et al.
patent: 4291410 (1981-09-01), Caples et al.
patent: 4387465 (1983-06-01), Becker
patent: 4423517 (1983-12-01), Danno et al.
patent: 4545061 (1985-10-01), Hileman
patent: 4561089 (1985-12-01), Rouse et al.
patent: 4567588 (1986-01-01), Jerrim
patent: 4649549 (1987-03-01), Halpern et al.
patent: 4653069 (1987-03-01), Roeder
patent: 4672658 (1987-06-01), Kauehrad et al.
patent: 4760586 (1988-07-01), Takeda

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Differential correlator for spread spectrum communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Differential correlator for spread spectrum communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential correlator for spread spectrum communication system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-855795

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.