Enhanced parallel-interference cancellation receiver based on MIMO systems

VBLAST receiver is effective technique in achieving high data rate in MIMO wireless communications. However, the complexity of VBLAST is very high because much time must be consume in performing linear nulling, successive interference cancelling and sorting, and the application of VBLAST is limited. The performance of parallel interference cancellation (PIC) receiver isn´t good as VBLAST though its signal processing time delay is smaller than VBLAST. In this paper, an enhanced PIC receiver is proposed. The first stage is using QR detection and the initial symbol estimation vector may be obtained. The second stage is applied the successive PIC scheme. After one layer is detected, the layer´s data in the initial vector is updated by the new detected layer data. The simulation results indicate that the performance of the propose receiver outperforms VBLAST receiver, at error bit rate 10^-3, the proposed scheme may obtain 1dB gains compared to VBLAST.