Radio receiver with frequency segment offset compensation 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 frequency domain orthogonal frequency-division multiplexing signal can be received, and a phase error offset in individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal can be compensated for based on estimates of the phase error offset for the individual frequency segments. Related radio receivers and radio systems are disclosed.
Claims19
A method of frequency offset compensation in a radio receiver, the method comprising:
- generating, in the radio receiver, an estimate of a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on processing the time domain orthogonal frequency-division multiplexing signal;
- compensating, using a first compensation loop in the radio receiver, for the carrier frequency offset in the time domain orthogonal frequency-division multiplexing signal based on the estimate of the carrier frequency offset, the first compensation loop including a first loop filter;
- generating a frequency domain orthogonal frequency-division multiplexing signal in the radio receiver from the time domain orthogonal frequency-division multiplexing signal;
- and
- compensating, using a second compensation loop in the radio receiver, for a phase error offset in individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal based on estimates of the phase error offset for the individual frequency segments, the second compensation loop including a plurality of loop filters each having a longer time constant than the first loop filter.
A radio receiver with frequency offset compensation, the radio receiver comprising:
- a first compensation loop configured to receive a time domain orthogonal frequency-division multiplexing signal and to compensate for a carrier frequency offset in the time domain orthogonal frequency-division multiplexing 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 orthogonal frequency-division multiplexing signal into frequency domain orthogonal frequency-division multiplexing signal;
- and
- a second compensation loop configured to apply phase error offset compensation to individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal, the second compensation loop including a plurality of phase error offset estimation circuits and a plurality of loop filters, the plurality of loop filters each having a longer time constant than the first loop filter.
A radio system with frequency offset compensation and phase error compensation, the radio system comprising:
- at least one antenna configured to receive a radio signal, the radio signal being an orthogonal frequency-division multiplexing signal;
- and
- a radio receiver including a first compensation loop and a second compensation loop, the first compensation loop including a first loop filter, the first compensation loop configured receive a time domain samples of the radio signal and to compensate for a carrier frequency offset using time domain circuitry, the second compensation loop including a plurality of loop filters each having a longer time constant than the first loop filter, and the second compensation loop configured to apply phase offset compensation for individual frequency segments of the radio signal in frequency domain circuitry.
Dependencies are inferred from the claim text.