Apparatus for frequency deviation estimation and method of estimating the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorAkihiro Okazaki
Life of this patent
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Abstract
The apparatus for frequency deviation estimation comprises two CIR estimating units (0) that receive a signal containing a known sequence therein and a plurality of correlation units that calculate the cross correlation between a known sequence recognized on a receiving side and the known sequence contained in the received signal. Each of the CIR estimating units (0) estimate the CIR according to correlation values obtained at prescribed timings from the correlation units. A frequency deviation calculating unit calculates frequency deviation according to the CIR. Therefore, the CIR can be determined with a lesser amount of calculation, so that the hardware can be simplified and the power consumption can be reduced.
Claims9
A frequency deviation estimation apparatus receiving a signal containing therein a known sequence having an elementary pattern repeated therein, said apparatus comprising:
- a channel impulse response estimating unit for estimating channel impulse responses at a plurality of timings according to the elementary pattern in the known sequence contained in the received signal;
- and
- a frequency deviation calculating unit for calculating frequency deviation according to the estimated channel impulse responses,
- wherein said channel impulse response estimating unit has a correlation unit for calculating a cross correlation at a plurality of timings between the elementary pattern in the known sequence recognized on a receiving side and the received signal.
A frequency deviation estimation apparatus receiving a signal containing therein a known sequence having an elementary pattern repeated therein, said apparatus comprising:
- a first channel impulse response estimating unit for estimating a first channel impulse response according to the elementary pattern in the known sequence contained in the received signal;
- a second channel impulse response estimating unit for estimating a second channel impulse response according to a sequence prepared by performing cyclic-shifting of the known sequence;
- and
- a frequency deviation calculating unit for calculating frequency deviation according to the first and second channel impulse responses.
A frequency deviation estimation apparatus receiving a signal containing therein a known sequence having an elementary pattern repeated therein, said apparatus comprising:
- a first frequency deviation estimating unit for estimating a channel impulse response according to the known sequence contained in the received signal and calculating frequency deviation from this channel impulse response;
- at least one second frequency deviation estimating unit in which the intervals at which the frequency deviation are calculated are different from those in said first frequency deviation estimating unit and in which one interval at which the frequency deviation is calculated is different from another interval at which the frequency deviation is calculated;
- and
- a frequency deviation combining unit for combing the frequency deviation that are output from each of said frequency deviation estimating units.
Dependencies are inferred from the claim text.