Phase tracking receiver
AssigneeStichting IMEC Nederland
InventorsVijay Kumar Purushothaman, Yao-Hong Liu, Robert Bogdan Staszewski
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Abstract
The present disclosure relates to a method for demodulating a modulated signal and a receiver. The receiver comprises: a phase detector with a first and second input, the first input being adapted to receive a modulated input signal; a comparator comprising an input coupled to an output of the phase detector; a frequency-offset cancellation block comprising an input coupled to an output of the comparator. The receiver includes a digitally controlled oscillator comprising: a control input coupled to an output of the comparator and an output of the frequency-offset cancellation block; and an output coupled to the second input of the phase detector.
Claims19
A receiver comprising:
- a phase detector comprising a first input and a second input, the first input being adapted to receive a modulated input signal, wherein the phase detector detects a carrier phase difference between the first and second input;
- a comparator comprising an input coupled to an output of the phase detector;
- and
- a frequency-offset cancellation block comprising an input coupled to an output of the comparator, wherein the frequency-offset cancellation block comprises an integrator, and wherein the frequency-offset cancellation block cancels a frequency difference between the modulated input signal and a digitally controlled oscillator, wherein the digitally controlled oscillator comprises:
- (1) a control input coupled to the output of the comparator and an output of the frequency-offset cancellation block, and
- (2) an output coupled to the second input of the phase detector.
A method for demodulating a modulated signal, comprising:
- receiving the modulated signal at an input of a phase detector having a first and second input,
- providing an output from the phase detector to an input of a comparator;
- comparing the input of the comparator with a threshold;
- providing an output of the comparator to (i) a control input of a digitally controlled oscillator and (ii) to an input of a frequency-cancellation block;
- providing an output of the frequency-cancellation block to the control input of the digitally controlled oscillator, wherein the output of the frequency-cancellation block is provided using an integrator;
- and
- providing an output of the digitally controlled oscillator to the phase detector.
Dependencies are inferred from the claim text.