Least Mean Square Frequency Domain Equalization for MIMO SC-FDMA System
Because single carrier modulation has low peak average power ratio (PAPR), it is used instead of multicarrier modulation in uplink transmission in Long Term Evolution (LTE). Channel state information (CSI) is very important issue in SC-FDMA system when applying equalization technique especially in high frequency selective fading channels where a linear equalizer is inefficient to remove the fading channel effects. To solve the inefficient performance of the multiple output multiple input (MIMO) SC-FDMA system in high frequency selective fading channels, an iterative (adaptive) frequency domain equalizer is presented using least mean square algorithm (IFDE-LMS or AFDE-LMS). The proposed IFDE-LMS shows better system performance compared to conventional zero forcing (ZF) equalizer. Simulation results show the effect of IFDE-LMS on the performance of MIMO SC-FDMA system using both localized SC-FDMA (LSC-FDMA) and interleaved SC-FDMA (ISC-FDMA) transmission types, where LSC-FDMA outperforms ISC-FDMA.
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