H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/18 (2006.01) H04L 27/22 (2006.01)
Patent
CA 2113135
A carrier phase estimation apparatus including a base band converter and a phase estimator. A received IF signal is converted to an in-phase component In and an quadrature component Qn of a digital base band signal in the base band converter. In the phase estimator, a non-linear circuit executes a non-linear operation of the components In and Qn to output non-linearly converted in-phase component In' and quadrature component Qn' of the digital base band signal and the components In' and Qn' are input to a pair of filters. In each filter, the components In' or Qn' are stored into shift registers at a predetermined timing and the signals stored in the shift registers are multiplied by respective weighting factors C k in respective multipliers. The multiplied values are summed by an adder and the obtained sum is divided by a stage number N of the shift register in a divider to obtain filtering signals Xn and Yn. That is, the weighted averaging of the components In' and Qn' is taken in the filters and then the filtering signals are transformed in a coordinate transformer to calculate an estimated carrier phase ~n. By taking the weighted average, the carrier phase fluctuating due to fading can be more precisely estimated.
Gowling Lafleur Henderson Llp
Mitsubishi Denki Kabushiki Kaisha
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