Semi-Blind Multi-cell Interference Detection and Cancellation in 5G Uplink OFDM Systems

As interference becomes one of the key factors restricting the performance of wireless network, many interference cancellation schemes are studied. However, most of these schemes have disadvantages in one way or another, such as high complexity and cost of the accurate feedback. In this case, blind interference cancellation schemes are proposed, which can eliminate the interference according to the received signal without any prior information, but with a very high searching complexity. To solve above issues, we propose a semi-blind interference parameter detection (Semi-BIPD) and signal restoration scheme in this paper. Firstly, a semi-blind interference detection module is investigated to detect the parameters related to strong inter-ference with the help of the received demodulation reference signal (DM-RS) sequence. Then, the channel parameters of both target user and interfering users are estimated. Finally, the signal restoration based on Semi-BIPD is conducted in the data sequence to eliminate the interference. Simulation results demonstrate that the proposed scheme can achieve better mean square error (MSE) with a low searching complexity in 5G uplink orthogonal frequency division multiplexing (OFDM) systems.