Impact of imperfect power control and channel estimation on the performance of multiuser detectors

Performance comparison of various linear multi-user and parallel interference cancellation (PIC) detectors in the presence of imperfect power control and channel estimation is studied by using both analysis and simulation. The results show that imperfect power control can even degrade the performance of a single-user detector. For suboptimal detectors, a tight power control is highly indispensable in order to achieve an excellent performance. Furthermore, the results indicate that interference cancellers can outperform linear multi-user detectors in case of imperfect power control. The conventional and partial PIC detectors are fairly sensitive to channel estimation errors, while the LMS PIC is quite robust