最適合成を用いたデータ拡散OFDM方式

抄録

In an OFDM transmission system, it is difficult to improve performance against frequency selective fading by using only an adaptive equalization because of the severe degradation of the SN ratio of specific carriers. In order to improve this, we propose an optimal data reconstruction from OFDM signal whose data symbols are spread in the frequency domain. In addition, we studied simplification of data spread OFDM with optimal data reconstruction. The bit error rate characteristics were examined by using computer simulations. Our results confirmed that the proposed method simplified data spread OFDM and equaled the performance of the conventional method. Moreover, we confirmed that combining it with large interleaver, rather than increasing carriers, improves the characteristics of the data spread OFDM under the Rayleigh frequency selective fading channel.