Method and apparatus for acquisition and tracking of orthogonal frequency division multiplexing symbol timing, carrier frequency offset and phase noise
AssigneeMarvell International Ltd.
InventorRavi Narasimhan
Life of this patent
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Abstract
A method for updating channel estimates in an orthogonal frequency division multiplexing receiver of a wireless local area network includes generating channel estimates for an orthogonal frequency division multiplexing subcarrier as a function of subcarrier index values. The method includes generating a complex number by summing a product of frequency domain signals and the channel estimates for each of the subcarrier index values and dividing the sum by a sum of a squared absolute value of the channel estimate for each of the subcarrier index values. The method includes multiplying the complex number by the channel estimates to generate updated channel estimates.
Claims14
A wireless network receiver, comprising:
- a carrier frequency offset circuit configured to estimate a carrier frequency offset associated with an orthogonal frequency division multiplexing (OFDM) signal received on a communication channel;
- a channel estimator configured to generate a first estimate of the communication channel based on the carrier frequency offset;
- and
- an update circuit configured to i) determine a correction factor to compensate for amplitude error and phase error, ii) generate an updated estimate of the communication channel using the first estimate and the correction factor, and iii) adapt, using the correction factor, the carrier frequency offset estimated by the carrier frequency offset circuit.
A method of operating a wireless network receiver, the method comprising:
- estimating a carrier frequency offset associated with an orthogonal frequency division multiplexing (OFDM) signal received on a communication channel;
- generating a first estimate of the communication channel based on the carrier frequency offset;
- determining a correction factor to compensate for amplitude error and phase error;
- generating an updated estimate of the communication channel using the first estimate and the correction factor;
- and
- adapting, using the correction factor, the carrier frequency offset estimated by the carrier frequency offset circuit.
Dependencies are inferred from the claim text.