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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,...
The novel frequency rotation techniques for suppressing the path interference and increasing the frequency diversity gain are proposed in uplink IFDMA system. In IFDMA, the path interference in multipath fading channel and the reduction of frequency diversity gain degrades the error rate performance, especially more significantly as the number of simultaneous access users becomes large. For suppressing...
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...
Interleaved frequency division multiple access (IFDM A) is frequency orthogonal multiple access scheme and acquires high frequency diversity gain. In addition, the peak to average power ratio (PAPR) of IFDM symbol is small due to the single carrier modulation and thus the nonlinear amplifier having good power efficiency can be used in the mobile station. If an IFDMA is applied to the down link access...
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