Channel Estimation for DFT precoded OFDMA with blockwise and interleaved subcarrier allocation

In this paper, a channel estimation algorithm in frequency domain for IFDMA is introduced. Moreover, a post processing algorithm for further improvement of the channel estimation is presented. The performance of IFDMA is analyzed and compared to DFT precoded OFDMA with blockwise subcarrier allocation with and without frequency hopping in terms of overhead that occurs due to pilot assisted channel estimation and in terms of performance gains due to frequency diversity. Taking both effects into account, it is shown that IFDMA outperforms DFT precoded OFDMA with blockwise subcarrier allocation even if a frequency hopping scheme is applied.