System, apparatus and method for cancelling tonal interference in an orthogonal frequency division multiplexing (OFDM) receiver
AssigneeSilicon Laboratories Inc.
InventorAlexander Kleinerman
Life of this patent
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Abstract
In one aspect, an apparatus includes: a fast Fourier transform (FFT) engine to receive orthogonal frequency division multiplexing (OFDM) samples of one or more OFDM symbols and convert the one or more OFDM samples into a plurality of frequency domain carriers; and a tone cancellation circuit coupled to the FFT engine to receive the one or more OFDM samples and generate a plurality of frequency carriers for the one or more OFDM samples, identify a highest magnitude frequency carrier of the plurality of frequency carriers, and remove tone interference from the OFDM samples based at least in part on the highest magnitude frequency carrier.
Claims20
An apparatus comprising:
- a buffer to store orthogonal frequency division multiplexing (OFDM) samples of one or more OFDM symbols;
- a fast Fourier transform (FFT) engine coupled to the buffer, the FFT engine to receive the one or more OFDM samples from the buffer and convert the one or more OFDM samples into a plurality of frequency domain carriers;
- and
- a tone cancellation circuit coupled to the FFT engine, the tone cancellation circuit to identify a highest magnitude frequency carrier of the plurality of frequency carriers and remove tone interference from the one or more OFDM samples based at least in part on the highest magnitude frequency carrier.
A method comprising:
- identifying, in a tone cancellation circuit of a receiver, from a plurality of frequency carriers of an orthogonal frequency division multiplexing (OFDM) symbol, a highest magnitude frequency carrier and first and second neighboring frequency carriers to the highest magnitude frequency carrier;
- iteratively calculating, in the tone cancellation circuit, a plurality of intermediate frequency carriers between the highest magnitude frequency carrier and a selected one of the first and second neighboring frequency carriers, and identifying a frequency value of a highest magnitude frequency carrier of the plurality of intermediate frequency carriers;
- and
- cancelling, in the tone cancellation circuit, a tone in the OFDM symbol based at least in part on the frequency value of the highest magnitude frequency carrier of the plurality of intermediate frequency carriers.
An apparatus comprising:
- means for identifying a highest magnitude frequency carrier and first and second neighboring frequency carriers to the highest magnitude frequency carrier of an orthogonal frequency division multiplexing (OFDM) symbol;
- means for calculating a plurality of intermediate frequency carriers between the highest magnitude frequency carrier and a selected one of the first and second neighboring frequency carriers;
- and
- means for cancelling a tone in the OFDM symbol based at least in part on a frequency value of a highest magnitude frequency carrier of the plurality of intermediate frequency carriers.
Dependencies are inferred from the claim text.