Research on Interference Alignment for Downlink Multi-Cell Multi-User Wireless Systems

For the communication system of mobile cellular, as the interference alignment, which had been proposed in the original IA scheme is based on precoding, that combined with decoding can fully eliminate the interference between the effective channels. Its new application is on precoding and suboptimal power allocation for the downlink multi-cell multi-user wireless system, with each BS performs equal power allocation among different users and employs. The design of low complex joint of the combination matrix between the transmitter and equalizer at the receiver and the distribution power, which targets to minimize the desired signal of its mean square error, to further enhance the property of the bit error rate for the corresponding noninterfering effective channel. Meanwhile, the proposed IA scheme shows better performance than the search IA scheme, for it's with even less antenna resources but also can achieve the same degrees of freedom.