New leakage-based iterative coordinated beam-forming for multi-user MIMO in LTE-Advanced

In this paper, we investigate a typical LTE-Advanced multi-user MIMO system where mobile stations (MSs) feedback limited channel state information using codebook based approaches. A joint optimization of multi-user scheduling, linear transmit beam-forming, and receive combining is conducted at the base station to combat the intra-cell interference created by multi-user MIMO operation. Low complexity coordinated beam-forming schemes based on proportional-fair metric is proposed for jointly designing the beam-forming and receive combining vectors. Feedback schemes complied with LTE-Advanced specification is also introduced for the proposed coordinated beam-forming scheme. System level evaluation is conducted to show that the proposed coordinated beam-forming can help improving the performance of LTE-Advanced systems significantly.