Wireless communication apparatus using an estimate of the amount-of-phase rotation using pilot signals

摘要

A decrease in weight calculation accuracy in MMSE combining caused by a shift in the discrete Fourier transform timing of received signals is prevented. A wireless communication apparatus BS1 includes an MMSE combining processing unit 31 that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals. The wireless communication apparatus BS1 includes an amount-of-phase-rotation estimating unit 32 that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals; and reverse rotation units 33a and 33b that apply a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit 32, to the frequency domain received signals. The MMSE combining processing unit 31 computes an MMSE weight based on the frequency domain received signals to which the reverse rotation has been applied by the reverse rotation units 33a and 33b, and performs MMSE combining.

主权项

1. A wireless communication apparatus including an MMSE combining processing unit that performs MMSE combining based on frequency domain received signals obtained by performing a discrete Fourier transform on received signals, the apparatus comprising:
an amount-of-phase-rotation estimating unit that estimates an amount of phase rotation occurring in the frequency domain received signals due to a shift in discrete Fourier transform timing of the received signals using pilot signals included in only a minimum unit of resource allocation to a user in a multiple access scheme; and a reverse rotation unit that applies a reverse rotation of an amount of rotation corresponding to the amount of phase rotation estimated by the amount-of-phase-rotation estimating unit, to the frequency domain received signals, wherein the MMSE combining processing unit computes an MMSE weight based on the frequency domain received signals to which the reverse rotation has been applied by the reverse rotation unit, and performs MMSE combining, and wherein the amount-of-phase-rotation estimating unit calculates the amount of phase rotation by calculating a mutual correlation at a different distance between pilots about the plural pilot signals included in a same minimum unit of resource allocation.