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UNB EE4253 Digital Communications
Department of Electrical and Computer Engineering - University of New Brunswick, Fredericton, NB, Canada
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Binary Sequence Correlation Tool

This online tool computes the correlation of periodic binary sequence. In particular, maximum length Linear Recursive Sequences (LRS) have distinct autocorrelation properties.


Binary Sequence
For correlation, ones and zeros are replaced by +1 and -1 respectively

01001000110100111000111101100010...
...
-+--+---++-+--+++---++++-++---+-...

Correlation Result
The correlation of a sequence with itself is autocorrelation. The autocorrelation result has a period of 85 bits corresponding to the length of the supplied sequence. The graph shows two full periods of the autocorrelation result. The first 32 values in the correlation output are shown below. 

85 -11 -11 5 -11 5 5 5 -11 5 5 5 5 5 5 -11 -11 5 5 5 5 -11 5 5 5 -11 5 5 5 5 -11 5 ...

Corellation
Enter two binary sequences (A,B) to be correlated. For autocorrelation, only the first sequence (A) is required.

Binary Sequence A:
Binary Sequence B:

Example Maximum Length Sequences: [ 7-bit ] [ 15-bit ] [ 31-bit ] [ 63-bit ]

Special Codes of Interest

Barker Codes

Each Barker code below may also be inverted and bit-reversed. [bits]

[2] + +
[2] + -
[3] + - -
[4] + - - -
[4] - + - -
[5] + + + - +
[7] + + + - - + -
[11] + + + - - - + - - + -
[13] + + + + + - - + + - + - +

Ref: R. H. Barker, Group synchronization of binary digital systems, in Communication Theory, W. Jackson, Ed. London, U.K.: Butterworths, 1953, pp. 273-287.

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Wed May 22 12:27:29 ADT 2013
Last Updated: 05 SEP 04 		Richard Tervo [ tervo@unb.ca ] Back to the course homepage...
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