BASE STATION APPARATUS, RADIO TRANSMISSION SYSTEM, RADIO BASE STATION PROGRAM, AND TIMING ESTIMATION METHOD

摘要

A base station apparatus (100) has an FFT unit (102) which FFT transforms a base station GI deleted signal (SBGID) obtained by removing a guard interval from a received signal and outputs a base station FFT signal (SBFFT). A mobile station separating unit (103) separates the base station FFT signal (SBFFT) in correspondence with mobile stations, based on a frequency channel signal (SBCH) provided by a frequency channel signal generator (105) and indicating a correspondence relationship between identification numbers assigned to mobile stations and frequency channels. Delay profile estimation circuits (104-1) to (104-M) corresponding to the mobile stations each estimate a delay profile from the input mobile station separated signal (SBDMX) and output delay profile estimation signals (SBDP(1)) to (SBDP (M)). The base station apparatus (100) thus estimates delay profiles independently for signals transmitted by a plurality of mobile stations and contained in the received signals received in one OFDM symbol time.