ECE4253 Digital Communications
	Department of Electrical and Computer Engineering - University of New Brunswick, Fredericton, NB, Canada

Constellation

STATES: H-E-B-A-B-D-J-H-E-C-B-D-O-G-J-A-B-B-K-O- STATE CHANGE QUADRANT CHANGE DIBIT 1 NEW STATE DIBIT 2 H to E 90 deg 00 E 10 E to B 0 deg 01 B 01 B to A 0 deg 01 A 11 A to B 0 deg 01 B 01 B to D 270 deg 11 D 11 D to J 180 deg 10 J 00 J to H 180 deg 10 H 01 H to E 90 deg 00 E 10 E to C 270 deg 11 C 10 C to B 90 deg 00 B 01 B to D 270 deg 11 D 11 D to O 270 deg 11 O 01 O to G 90 deg 00 G 00 G to J 180 deg 10 J 00 J to A 270 deg 11 A 11 A to B 0 deg 01 B 01 B to B 0 deg 01 B 01 B to K 180 deg 10 K 00 K to O 0 deg 01 O 01

Summary

The symbols and bits below represent the output from a V.22bis modem in which a constant value binary message (11111111111...) has been scrambled using the polynomial P(x)  1 + x^-14 + x^-17 before modulation.

The result may be descrambled by multiplication with P(x)=(100000000000001001) using the Online Calculator Tool

Refreshing this page will give a different sequence every time.