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

Constellation

STATES: M-M-N-D-J-H-L-K-H-K-B-H-J-P-J-M-P-H-F-J- STATE CHANGE QUADRANT CHANGE DIBIT 1 NEW STATE DIBIT 2 M to M 0 deg 01 M 11 M to N 0 deg 01 N 10 N to D 180 deg 10 D 11 D to J 180 deg 10 J 00 J to H 180 deg 10 H 01 H to L 270 deg 11 L 10 L to K 0 deg 01 K 00 K to H 90 deg 00 H 01 H to K 270 deg 11 K 00 K to B 180 deg 10 B 01 B to H 270 deg 11 H 01 H to J 180 deg 10 J 00 J to P 90 deg 00 P 11 P to J 270 deg 11 J 00 J to M 0 deg 01 M 11 M to P 90 deg 00 P 11 P to H 90 deg 00 H 01 H to F 90 deg 00 F 00 F to J 90 deg 00 J 00

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.