US 12,476,852 B2 · Phasor-based signal detector

Abstract

A phasor-based signal detector includes a signal processor to detect symbols in a received signal in the presence of an offset between the carrier frequency and an oscillator frequency of the signal processor. The signal processor calculates a phasor that indicates a phase difference between a first sample in a first symbol group and a second sample in a second symbol group. The first and second samples each include a real part and an imaginary part corresponding to a same sample position within the first and second symbol groups. Calculating the phasor includes a complex multiplication of one of the samples and a conjugate of the other one of the samples. A phase difference indicated by a phasor meeting a criteria may be used to estimate a carrier frequency offset (CFO). If the CFO is within a supported range, the signal processor may coherently accumulate symbols.

Claims24

Dependent claims

A signal processing method, comprising:

calculating a first sample based on energy of a first symbol group comprising at least one symbol;
calculating a second sample based on energy of a second symbol group comprising at least one symbol;
calculating a first conjugate of one of the first sample and the second sample;
and
calculating a first phasor based on a complex multiplication of the first conjugate and the other one of the first sample and the second sample;
wherein:
the first sample corresponds to a first sample position of each symbol of the first symbol group;
and
the second sample corresponds to the first sample position of each symbol of the second symbol group;
determining whether the first phasor satisfies one or more criteria;
and
generating an indication indicating whether the first phasor satisfies the one or more criteria.

9 more elements

A signal processing method, comprising:

calculating a first sample based on energy of a first symbol group comprising at least one symbol;
calculating a second sample based on energy of a second symbol group comprising at least one symbol;
calculating a first conjugate of one of the first sample and the second sample;
and
calculating a first phasor based on a complex multiplication of the first conjugate and the other one of the first sample and the second sample;
wherein:
the first sample corresponds to a first sample position of each symbol of the first symbol group;
and
the second sample corresponds to the first sample position of each symbol of the second symbol group;
calculating a third sample based on energy of a third symbol group comprising at least one symbol;
calculating a fourth sample based on energy of a fourth symbol group comprising at least one symbol;
calculating a second conjugate of one of the third sample and the fourth sample;
calculating a second phasor based on a complex multiplication of the second conjugate and the other one of the third sample and the fourth sample;
and
accumulating the first phasor and the second phasor into a first accumulated phasor, wherein:
the third sample corresponds to the first sample position of each symbol of the third symbol group;
and
the fourth sample corresponds to the first sample position of each symbol of the fourth symbol group.

15 more elements

Dependencies are inferred from the claim text.

Phasor-based signal detector

Life of this patent

Phasor-based signal detector

Life of this patent

Abstract

Claims24