Tri-diagonalizing approach on frequency domain equalization in a doubly-selective channel
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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Frequency domain equalization (FDE) has been studied for reducing inter-symbol interference (ISI) caused by frequency selective fading in single carrier systems. When a high-mobility terminal exists in the system, the channel state may change within a DFT block. Then, the ISI reduction performance of FDE degrades since cyclicity of the channel matrix is lost. We propose to divide a received data block into multiple subblocks to decrease the channel transition within the DFT block in fast fading environments. Also, to satisfy periodicity of the received signal in each subblock, we introduce a pseudo cyclic prefix technique. The results of numerical analysis show that the proposed method can effectively decrease the error floor in fast fading environments.