Subblock Processing for Frequency-Domain Turbo Equalization Under Fast Fading Environments

Frequency-Domain Equalization (FDE) has been studied for suppressing Inter-Symbol Interference (ISI) due to frequency selective fading in single carrier systems. When a high-mobility terminal is assumed in the system, channel transition within an FFT block cannot be ignored. Then, the ISI reduction performance of FDE degrades since cyclicity of the channel matrix is lost. To solve this problem, a method of dividing the received data block into multiple subblocks has been proposed. In the paper, the subblock processing is applied to Frequency-Domain Turbo Equalization (FDTE).