Hamid Rajabi - Student Member, IEEE, Faculty of Engineering, Birjand University, Birjand, Iran
Naaser Neda - Assistant professor, Faculty of Engineerig, Birjand University, Birjand, Iran

This paper focuses on Multiuser-MIMO (MU-MIMO) technique in 3GPP LTE; a reliable technique to enhance the overall system capacity, especially in TM5, TM8, and TM9. However due to low-resolution LTE-TM5 precoders, co-scheduled users in MU-MIMO may still experience a strong inter-user-interference (IUI) in small cells. To overcome the IUI, an interference-aware (IA) detector scheme is utilized which exploits the structure of the interferer data in the detection. In this paper, we propose a modified IA (MIA) detector scheme that improves the data rates and complexity of IA with an identical error performance. We evaluate the performance of IA and MIA detectors over single-user (SU) detector through computer simulations. Our simulation results depict that both IA and MIA outperform the SU detector in MU-MIMO LTE-TM5. Generally, we observe that the MIA detector achieves significantly higher data rates compared to the IA, especially in higher modulation orders and if the users have multiple receive antennas. Furthermore, the error performance may still be satisfactory if both the desired and interferer users have a same modulation order

MU-MIMO, 3GPP LTE, transmission mode 5, Multiuser detector