| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a configuration capable of forming OFDM/OFDMA signals with different circulating shift amounts and of adding the CSTD function to a modulation part of a wireless device without the need to modify a circuit configuration in a base band. <P>SOLUTION: An integrated base station device separates one OFDM symbol of an OFDM/OFDMA signal into n pieces at intervals of a guard interval, converts them into n parallel optical signals having wavelengths difference from one another, adjusts delay times so that the time in the modulation section is the same to multiplex wavelengths, and distributes them to a plurality of remote base station devices via an optical transmission path. The remote base station device demultiplexes the optical signal into n parallel optical signals and divides an optical signal of one wavelength into two optical signals, adjusts delay times of the total (n+1) parallel optical signals so that the times in the modulation section do not overlap one another and the first and last optical signals have the same wavelength as that of the optical signals divided into two, converts them into a wavelength-multiplexed optical signal of (1+1/n) OFDM symbols to which the guard interval is added, and transmits it as a radio signal to a wireless terminal station device. <P>COPYRIGHT: (C)2010,JPO&INPIT |
