Patent ID: 7593317
Filing Date: 2009-09-22
Classification: H01Q,H04B,H04L

Abstract:
1. A radio base-station apparatus comprising: a transmission weight computing section for computing transmission weights for directional transmission using an OFDM signal, the OFDM signal comprising a plurality of sub-carriers; a transmission correcting value memory section for storing one correcting value for correcting the transmission weight for each of the plurality of sub-carriers; a transmitting weight correcting section for correcting the transmission weight for each of the plurality of sub-carriers with the correcting value; and a plurality of transmitting branches, each of the transmitting branches for weighting transmission data with the corrected transmission weight outputted from the transmission weight correcting section on a sub-carrier-by-sub-carrier basis and for providing the weighted transmission data to an antenna element, the correcting value is used to correct a frequency characteristic of amplitude deviations and phase deviations between transmitting branches, and wherein the correcting value is determined separately for each individual transmitting branch based on respective amplitude deviation and respective phase deviation of the transmission data within each individual transmitting branch.