Frequency offset compensation apparatus and frequency offset compensation method
AssigneeNEC Corporation
InventorsKohei HOSOKAWA, Yuichi NAKAMURA
Life of this patent
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Abstract
A frequency offset compensation apparatus includes: first FFT means for performing a discrete-time Fourier transform of an input signal; second FFT means for performing a discrete-time Fourier transform; and offset compensation means for changing an order of output data of the first FFT means according to a frequency offset compensation amount, and rearranging the output data, and then inputting the output data to the second FFT means. This makes possible a frequency offset compensation without needing a new complex multiplier or a new memory in optical communication.
Claims10
A frequency offset compensation apparatus comprising:
- first FFT unit for performing a discrete-time Fourier transform of an input signal;
- second FFT unit for performing a discrete-time Fourier transform;
- and
- offset compensation unit for changing an order of output data of the first FFT unit according to a frequency offset compensation amount, rearranging the output data put in the order pursuant to the frequency offset compensation amount, and then inputting the output data to the second FFT unit.
A frequency offset compensation method wherein:
- an input signal is subjected to a first discrete-time Fourier transform;
- an order of output data having been subjected to the first discrete-time Fourier transform is changed according to a frequency offset compensation amount;
- the output data put in the order pursuant to the frequency offset compensation amount are rearranged;
- and
- the output data rearranged are subjected to a second discrete-time Fourier transform.
Dependencies are inferred from the claim text.