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In this paper, a scheme for constructing the flat frequency spectrum of interleaved frequency division multiple access (IFDMA) is proposed. Since IFDMA is one of the single carrier modulation schemes, the frequency spectrum components are fluctuated and depend on the information data sequence. Even if IFDMA modulation scheme makes frequency spectrum dispersive for obtaining frequency diversity gain,...
Recently, an interleaved frequency division multiple access (IFDMA) has been attracting much attention. Accurate channel estimation is essential for both IFDMA demodulation and frequency domain equalization (FDE) at the receiver. In this paper, we propose a decision directed channel estimation (DD-CE) method to improve the tracking performance of fading fluctuation. In the proposed method, the frequency...
Maximum likelihood detection with QR decomposition and M-algorithm (QRM-MLD) is one of the detection methods in multiple-input multiple-output (MIMO) multiplexing. We recently proposed an iterative QRM-MLD with decision directed channel estimation and showed that better transmission performance can be obtained compared to that with conventional pilot assisted channel estimation. In this paper, to...
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