MMSE DFE for MIMO DFT-spread OFDMA

In this work, we propose a Decision feedback equalizer (DFE) for Multiple Input Multiple Output (MIMO) DFT-spread OFDMA. This DFE can handle Multiple users, multiple antennas at the transmitter and receiver and the intersymbol interference in the received symbols of the DFT-spread OFDMA. The conventional method used in DFT-spread OFDMA is linear Frequency domain equalization (FDE). The DFE, with a feed forward (FF) filter operating in frequency domain and a feed back (FB) filter operating in the time domain can perform better than FDE, in channels with severe ISI. The block-wise circular convolution of the channel impulse response makes it difficult to initialize the DFE. We use an LE to get a temporary set of decisions and use them in initializing the DFE.