Phase/frequency controlled phase shift keyed signal carrier reco

Details Phase/frequency controlled phase shift keyed signal carrier reco Phase/frequency controlled phase shift keyed signal carrier reco

1978-11-29

1980-09-23

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329124, 328151, 331 23, 375 83, H03D 318, H03L 708

Patent

active

042245753

ABSTRACT:
A biphase shift keyed modulated carrier is input to an analog delay line having a plurality of sampling taps time spaced along the line. The modulated input carrier is sampled at a rate four times the carrier frequency to produce amplitude samples of the input. The taps of the delay line are divided into two groups comprising alternate tap sets and the amplitude samples of each group are summed for decoding the I and Q channels of a modulated carrier. The summed signal of each of the channels is input to an individual sample and hold circuit which aliases the carrier frequency to baseband. The output of the first sample and hold circuit of each channel is provided to a second sample and hold circuit for the respective channels. The second sample and hold circuit of each channel is clocked at a data rate derived from a bit timing loop. An estimation of the data is produced by each of the second sample and hold circuits with the data produced by the second sample and hold circuit of one channel providing a recovered carrier signal output. Further, the data produced by each of the second sample and hold circuits, after inversion in one line by means of an inverting amplifier, is input to a phase comparator. The output of the phase comparator is filtered and used to drive a voltage controlled oscillator that generates the clock pulses to operate the first sample and hold circuits and also to clock the delay line.

REFERENCES:
patent: 3838350 (1974-09-01), Ewanus et al.
patent: 3953745 (1976-04-01), Bailey
patent: 4079329 (1978-03-01), England et al.

Affiliated with

Also associated with

Rating

Phase/frequency controlled phase shift keyed signal carrier reco does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase/frequency controlled phase shift keyed signal carrier reco, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase/frequency controlled phase shift keyed signal carrier reco will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-646805