16-QAM Modulator with PLL amplification devices

Details 16-QAM Modulator with PLL amplification devices 16-QAM Modulator with PLL amplification devices

1984-01-09

1986-02-18

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 17, 332 19, 332 22, 332 23R, 375 39, 455 42, 455110, 455113, H03C 300, H04B 104, H04L 2302, H04L 512

Patent

active

045715491

ABSTRACT:
A 16-quadrature amplitude modulation (QAM) modulator for radio links converts a train of data into signals having a phase selected from sixteen predetermined phase values and an amplitude selected from four values. The modulator divides the data train into two data sub-trains. The two data sub-trains are respectively applied to a pair of four-phase modulators that are fed by a carrier source. The 16-QAM modulator also comprises two phase locked loops each including a voltage controlled microwave oscillator and an associated differential phase detector. The differential phase detector responds to the output of the associated four-phase modulator and the output of the associated voltage controlled microwave oscillator. Predetermined parts of the output signals of the two phase locked loops are added.

REFERENCES:
patent: 4039961 (1977-08-01), Ishio et al.
patent: 4327439 (1982-04-01), Gockler et al.

Affiliated with

Also associated with

Rating

16-QAM Modulator with PLL amplification devices does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 16-QAM Modulator with PLL amplification devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 16-QAM Modulator with PLL amplification devices will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1552231