Study of multiuser feedback-based decision feedback equalizer

Multiuser interference cancellation decision feedback equalizer with error feedback filter (MIC DFE-EFF), for DS-CDMA, based on multiuser feedback structure, has been proposed. lt has solved this problem that conventional adaptive decision feedback equalizer has higher bit error rate (BER) and smaller capacity. We depict the structure of MIC DFE-EFF, analyze its algorithm and relative algorithm. It can deal with intersymbol interference (ISI), multiple access interference (MAI) and noise at the same time. Simulation results show that the proposed MIC DFE-EFF outperforms conventional DFE, DFE-EFF and PIC at bit error rate (BER) performance, also its capacity is larger than DFE and DFE-EFF. Although MIC DFE-EFF increase computational complexity compared to DFE-EFF, its computational complexity is less than PIC.