Adaptive multiharmonic phase jitter compensation

Details Adaptive multiharmonic phase jitter compensation Adaptive multiharmonic phase jitter compensation

1988-04-28

1989-08-08

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375 11, 36472419, H04L 700, H04L 2536

Patent

active

048560316

ABSTRACT:
A multiharmonic adaptive phase jitter compensator for a high speed modem is provided. The compensator includes an IIR filter for each harmonic of phase jitter for which compensation is desired. The coefficient update of each IIR filter as well as the input to the primary jitter frequency IIR receives identical information from a phase detector which compares an equalized phase corrected signal entering a decision means with the ideal point determined by the decision means. However, the IIRs for the higher harmonics are trained with different information. Thus, the primary jitter frequency as adaptively determined by the first IIR is fed to harmonic computation circuitry. The harmonic computation circuitry then provides an adapted second harmonic to the second harmonic IIR, and adapted third harmonic to the third harmonic IIR, etc. The outputs of all the IIRs are summed, and the cosine and sine of the sum are provided to phase correct the equalized signal before it enters the decision circuitry.

REFERENCES:
patent: 4253184 (1981-02-01), Gitlin
patent: 4320526 (1982-03-01), Gitlin
patent: 4550415 (1985-10-01), DeBus, Jr. et al.
patent: 4575857 (1986-03-01), Murakami
patent: 4635276 (1987-01-01), Karabinis
patent: 4644562 (1987-02-01), Kavehrad et al.
patent: 4730341 (1988-03-01), Saito

Affiliated with

Also associated with

Rating

Adaptive multiharmonic phase jitter compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive multiharmonic phase jitter compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive multiharmonic phase jitter compensation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-911831