Digital code word detection

Details Digital code word detection Digital code word detection

1980-07-29

1983-02-22

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375106, 371 42, 329104, 3401463WD, H04L 702

Patent

active

043751024

ABSTRACT:
A method by which code words in a digital bit stream can be detected in a reliable manner without word synchronization, in an environment where the bit error rate is high. The bit stream is divided into data blocks having a number of bits equal to the number of bits of the code word. The number of times that the same bit state is detected in a plurality of blocks in the same relative position in the data block is accumulated. For each bit position the accumulated value is compared with a threshold value and when the threshold value for each bit position is exceeded, the code word is detected from the digital state of the accumulated value. The cyclic permutation of the bits of the code word and the code word itself represent one and the same message. In a device using this method, a bit counter feeds a word counter with the bit stream applied at an output, a shift register receiving each data block as effectively formed by the word counter. Counters count the "1" and "0" occurrences in each shift register section in successive data blocks. Threshold devices provide outputs when their thresholds as given by generators and are exceeded. The outputs are gated by combinatorial logic gates, to record a detected code word in a register 33 which addresses a store 33 to find the associated message.

REFERENCES:
patent: 3463911 (1969-08-01), Dupraz et al.
patent: 4271520 (1981-06-01), Coombes et al.

Affiliated with

Also associated with

Rating

Digital code word detection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital code word detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital code word detection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1375567