A Partial Zero-Forcing Precoding Method for Downlink Multi-user MIMO Channel

In this paper, we introduce a preprocessing method based on interference figure (PBIF) for downlink channel of multi-users visual MIMO system. By using singular value decomposition (SVD), the method decomposes multiuser downlink channel into multiple parallel single-user downlink channels and each channel have specific multi-user interference based on predesigned interference figure. We propose a special kind of interference figure and provide the corresponding method for parameters optimization. Simulation results show that it can obviously promote the outage capacity when outage probability (Pout) is small. When Pout is 0.1, compared with block diagonalization method, the outage capacity has been improved 47% by PBIF-Rp, and 106% by PBIF-Op.