Tone tracking and cancellation for radio receivers
AssigneeSkyworks Solutions, Inc.
InventorsAlexander Kleinerman, Connor William Blasie
Life of this patent
Estimating the term…
Abstract
Aspects of this disclosure relate to canceling a tone in a radio signal. A location of an interfering tone can be estimated in an orthogonal frequency division multiplexing symbol (OFDM). An interfering tone can be detected in a subsequent OFDM symbol based on the estimate of the location of the interfering tone in the OFDM using closed loop tone detection. The interfering tone in the subsequent ODFM can be canceled. Tone cancellation can be performed using digital signal processing circuitry. Tone cancellation can be performed in radio systems.
Claims20
A method of tone cancellation for a radio signal, the method comprising:
- generating a vector for an orthogonal frequency division multiplexing symbol based on an estimated interfering tone of a previous orthogonal frequency division multiplexing symbol, the vector including frequency components for a portion of a bandwidth of the orthogonal frequency division multiplexing symbol;
- and
- canceling a tone in the orthogonal frequency division multiplexing symbol based on a frequency component of the frequency components of the vector having a greatest magnitude, the method performed using digital signal processing circuitry.
A method of tone cancellation for a radio signal, the method comprising:
- detecting, using closed loop tone detection, a respective interfering tone in each of a plurality of orthogonal frequency division multiplexing symbols based on an estimate of a location of an interfering tone in a first orthogonal frequency division multiplexing symbol;
- and
- canceling, for each of the plurality of orthogonal frequency division multiplexing symbols, the respective interfering tone based on the detecting, the method performed using a radio receiver.
Digital signal processing circuitry for tone cancellation, the digital signal processing circuitry comprising:
- a tone estimation circuit configured to generate an estimate of an interfering tone of a first orthogonal frequency division multiplexing symbol;
- a tone analysis circuit configured to determine a location of an interfering tone in a second orthogonal frequency division multiplexing symbol based on the estimate of the interfering tone of the first orthogonal frequency division multiplexing symbol, the tone analysis circuit being included in a closed loop;
- and
- a tone cancellation circuit configured to cancel the interfering tone in the second orthogonal frequency division multiplexing symbol based on an output signal from the tone analysis circuit.
Dependencies are inferred from the claim text.