Methods and systems for the simultaneous quantitative measuremen

Details Methods and systems for the simultaneous quantitative measuremen Methods and systems for the simultaneous quantitative measuremen

1987-01-20

1989-05-02

Blum, Theodore M.

Boots, shoes, and leggings

364574, 375118, G06K 1500, H03F 1266, H04L 700

Patent

active

048274313

ABSTRACT:
Methods and systems are disclosed for simultaneously measuring three impairments such as phase jitter, amplitude jitter, and noise, to a quadrature amplitude modulated data communication channel. The invention generally comprises: correlating received signals to an ideal constellation point; rotating the received signals and ideal constellation point such that the ideal point lies on the x axis; determining a phase jitter index (cos.alpha.) as a function (x/x.sub.o) of the average x coordinates of the rotated received signals and the rotated constellation point; determining an index of amplitude jitter (m.sup.2) as a function (((x.sup.2 -y.sup.2)/(2x.sub.p.sup.2 -x.sub.o.sup.2))-1) of the square of average x coordinates, the average of the square of the x coordinates, the average of the square of the y coordinates of the rotated received point, and the square of the rotated constellation point; and determining a noise index .DELTA.x.sub.n 2 as a function ((x.sup.2 +y.sup.2 -x.sub.o.sup.2 (1+m.sup.2))/2) of the average of the square of the x coordinates, the average of the square of the y coordinates, the square of the rotated constellation point, and the amplitude jitter index. The system invention generally comprises means for accomplishing the method invention.

REFERENCES:
patent: 4027250 (1977-05-01), Lang
patent: 4381540 (1983-04-01), Armstrong
patent: 4631738 (1986-12-01), Betts et al.

Affiliated with

Also associated with

Rating

Methods and systems for the simultaneous quantitative measuremen does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods and systems for the simultaneous quantitative measuremen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and systems for the simultaneous quantitative measuremen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-590296