Improved Partial Parallel Decision Feedback Multiuser Detection for Multiuser-MIMO System

In this letter, we propose a novel interference cancellation method which employs an iterative parallel decision feedback detector (P-DFD) with hard decisions based on minimum mean-squared error (MMSE) for multiuser- MIMO system. In the conventional P-DFD, the multi-access interference (MAI) is cancelled in parallel with the same treatment for each user. Unlike with conventional P-DFD, the proposed detectors perform detection user by user which feedback the current symbols of detected users. In order to further reduce error propagation the users are detected in an ascending order of the SNR at the output of the feed forward filter.