Apparatus for receiver with carrier frequency offset correction using phase and frequency information and associated methods
AssigneeSilicon Laboratories Inc.
InventorsAntonio Torrini, Hendricus de Ruijter, Yan Zhou, David Trager
Life of this patent
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Abstract
An apparatus includes a radio-frequency (RF) receiver for receiving an RF signal using a plurality of antennas. The RF receiver includes a demodulator to provide a switch signal to cause the RF receiver to use an antenna in the plurality of antennas. The RF receiver further includes a carrier frequency offset (CFO) correction circuit that uses an estimation of the carrier frequency offset and an estimation of phase differences to remove the carrier frequency offset.
Claims20
An apparatus, comprising:
- a radio-frequency (RF) receiver for receiving an RF signal using a plurality of antennas, the RF receiver comprising:
- a demodulator to provide a switch signal to cause the RF receiver to use one antenna in the plurality of antennas in an antenna diversity configuration;
- a phase difference estimation (PDE) circuit to provide an estimation of phase differences, wherein the PDE circuit comprises a plurality of circuit branches, wherein each of the plurality of circuit branches comprises an averaging circuit, a phase to frequency converter circuit, a Coordinate Rotation Digital Computer (Cordic), and an exponentiation circuit;
- and
- a carrier frequency offset (CFO) correction circuit that uses an estimation of the carrier frequency offset and the estimation of phase differences to remove the carrier frequency offset.
An apparatus, comprising:
- a radio-frequency (RF) receiver for receiving an RF signal using a plurality of antennas, the RF receiver comprising:
- a demodulator to provide a switch signal to cause the RF receiver to use one antenna in the plurality of antennas in an antenna diversity configuration;
- and
- a phase difference estimation (PDE) circuit to provide an estimation of phase differences in a set of phase samples, wherein the PDE circuit comprises a plurality of circuit branches, wherein each of the plurality of circuit branches comprises an averaging circuit, a phase to frequency converter circuit, a Coordinate Rotation Digital Computer (Cordic), and an exponentiation circuit;
- a phase difference removal (PDR) circuit to remove phase differences based on the estimation of the phase differences in the set of phase samples to generate an output signal;
- a carrier-frequency-offset (CFO) estimation circuit to use the output signal of the PDR circuit to provide an estimation of a carrier frequency offset;
- and
- a CFO removal circuit to use the estimation of the carrier frequency offset and the switch signal to remove the carrier frequency offset.
A method of correcting a carrier frequency offset (CFO) in a radio-frequency (RF) receiver using a plurality of antennas, the method comprising:
- using a demodulator to provide a switch signal to cause the RF receiver to use one antenna in the plurality of antennas in an antenna diversity configuration;
- and
- using a CFO correction circuit to estimate the carrier frequency offset by using the switch signal, and to remove the carrier frequency offset by using a phase difference estimation (PDE) circuit, wherein using the PDE circuit comprises using a plurality of circuit branches, and wherein each of the plurality of circuit branches comprises an averaging circuit, a phase to frequency converter circuit, a Coordinate Rotation Digital Computer (Cordic), and an exponentiation circuit.
Dependencies are inferred from the claim text.