Science & Engineering Research Support soCiety (SERSC)
An efficient turbo Frequency Domain Equalization (FDE) based on symbol-wise Minimum Mean-Square Error (MMSE) filtering is proposed for a novel Space-Time Block Code (STBC) MIMO system. The transmitter sends a separate data block via STBC using two antennas per group to get diversity gain. The receiver can effectively utilize Inter-Antenna Interference (IAI) and Inter-Symbol Interference (ISI) followed by frequency domain equalization to process Soft Interference Cancellation (SIC). After frequency domain filtering, the symbol Log-Likelihood Ratio (LLR) calculated from the outputs of equalizer is as the inputs of the Soft-In Soft-Out (SISO) decoder.