Receiving apparatus and communication apparatus, and communication system

摘要

To improve a quality of a combined signal obtained by maximum ratio combining performed when a transmission signal of OFDM system is diversity-received with a small computation amount or a small circuit size. In a receiving apparatus, a combining unit corrects, when combining a sub-carrier signal of each branch obtained by performing Fourier transform on a reception signal of each branch at a maximum ratio for each sub-carrier, a weighting coefficient of each branch according to a magnitude relation of an intensity of the reception signal of each branch before Fourier transform. Specifically, the combining unit corrects the weighting coefficient of each branch so as to weaken an influence of a transmission path response estimated for a sub-carrier signal of the branch in branches with smaller reception signal intensities.

主权项

1. A diversity reception method in an orthogonal frequency division multiplexing system having a plurality of reception branches, the method comprising:
obtaining correction coefficients according to a magnitude relation of an intensity of a reception signal of each of the branches, the correction coefficients being smaller in the branches with smaller reception signal intensities; performing Fourier transforms on the reception signal of each of the branches to output sub-carrier signals corresponding to respective sub-carriers; estimating a transmission path response for each of the sub-carrier signals for each of the branches; and correcting for each of the sub-carriers, when obtaining a combined signal by maximum ratio combining by performing a weighted addition on the sub-carrier signals of each of the branches based on the estimated transmission path response of each of the branches, a weighting coefficient with each of the correction coefficients.