Radio receiver with offset compensation loops and related methods
AssigneeSkyworks Solutions, Inc.
InventorsAlexander Kleinerman, Bradley Arthur Wallace
Life of this patent
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Abstract
Aspects of this disclosure relate to frequency offset compensation in a radio receiver. In embodiments of the disclosure, a carrier frequency offset can be compensated for in a time domain orthogonal frequency-division multiplexing signal, a frequency domain signal can be generated from the time domain orthogonal frequency-division multiplexing signal, and a phase error offset can be compensated for in the frequency domain signal. Such offset compensation can be performed using two offset compensation loops. Related radio receivers and radio systems are disclosed.
Claims20
A method of frequency offset compensation in a radio receiver, the method comprising:
- compensating, with a first compensation loop in the radio receiver, for a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on an estimate of the carrier frequency offset, the first compensation loop including a first loop filter;
- generating, in the radio receiver, a frequency domain signal from the time domain orthogonal frequency-division multiplexing signal;
- and
- compensating, with a second compensation loop in the radio receiver, for a phase error offset in the frequency domain signal based on an estimate of the phase error offset, the second compensation loop including a second loop filter, and the first loop filter having a longer time constant than the second loop filter.
A method of frequency offset compensation in a radio receiver, the method comprising:
- generating an estimate of a carrier frequency offset based on cyclic prefix correlation;
- compensating, in the radio receiver, for the carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on the estimate of the carrier frequency offset;
- generating, in the radio receiver, a frequency domain signal from the time domain orthogonal frequency-division multiplexing signal;
- and
- compensating, in the radio receiver, for a phase error offset in the frequency domain signal based on an estimate of the phase error offset.
A method of frequency offset compensation in a radio receiver, the method comprising:
- compensating, in the radio receiver, for a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on an estimate of the carrier frequency offset;
- generating, in the radio receiver, a frequency domain signal from the time domain orthogonal frequency-division multiplexing signal;
- generating an estimate of a phase error offset using average phase error estimation;
- and
- compensating, in the radio receiver, for the phase error offset in the frequency domain signal based on the estimate of the phase error offset.
A method of frequency offset compensation in a radio receiver, the method comprising:
- compensating, in the radio receiver, for a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on an estimate of the carrier frequency offset;
- generating, in the radio receiver, a frequency domain signal from the time domain orthogonal frequency-division multiplexing signal;
- and
- compensating, in the radio receiver, for a phase error offset in the frequency domain signal based on an estimate of the phase error offset, the compensating for the phase error offset is applied before equalizing the frequency domain signal.
A method of frequency offset compensation in a radio receiver, the method comprising:
- compensating, in the radio receiver, for a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on an estimate of the carrier frequency offset;
- generating, in the radio receiver, a frequency domain signal from the time domain orthogonal frequency-division multiplexing signal;
- and
- compensating, in the radio receiver, for a phase error offset in the frequency domain signal based on an estimate of the phase error offset, the compensating for the phase error offset is applied on a plurality of individual frequency segments of the frequency domain signal.
A radio receiver with frequency offset compensation, the radio receiver comprising:
- a first compensation loop configured to compensate for carrier frequency offset in a time domain signal, the first compensation loop including a carrier frequency offset estimation circuit and a first loop filter;
- a Fourier transform engine configured to convert the time domain signal into frequency domain signal;
- and
- a second compensation loop configured to apply phase error offset compensation to the frequency domain signal, the second compensation loop including a phase error offset estimation circuit and a second loop filter.
Dependencies are inferred from the claim text.