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 OFDM 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 an estimate of a location of an interfering tone in a first orthogonal frequency division multiplexing symbol;
- detecting, using closed loop tone detection, an interfering tone in a second orthogonal frequency division multiplexing symbol based on the estimate of the location of the interfering tone in the first orthogonal frequency division multiplexing symbol;
- and
- canceling the interfering tone in the second orthogonal frequency division multiplexing symbol based on the detecting the interfering tone of the second orthogonal frequency division multiplexing symbol, the method performed using digital signal processing circuitry.
A radio system with tone cancellation, the radio system comprising:
- at least one antenna configured to receive a radio signal;
- and
- a radio receiver configured to process the radio signal to generate orthogonal frequency division multiplexing symbols, the radio receiver including digital signal processing circuitry configured to generate an estimate of a location of an interfering tone in a first symbol of the orthogonal frequency division multiplexing symbols, determine an interfering tone in subsequent symbol of the orthogonal frequency division multiplexing symbols using closed loop tone detection that is based on the estimate of the location of the interfering tone in the first symbol, and cancel the interfering tone in the subsequent symbol.
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 Fourier transform engine configured to generate a vector for a portion of a bandwidth of a second orthogonal frequency division multiplexing symbol based on the estimate of the interfering tone of the first orthogonal frequency division multiplexing symbol, the vector including frequency domain components;
- and
- a tone cancellation circuit configured to cancel the interfering tone in the second orthogonal frequency division multiplexing symbol based on a frequency component of the frequency domain components having a greatest magnitude.
Dependencies are inferred from the claim text.