Adaptive Network Precoding Based on SJNR to Mitigate Inter-Cell Interference

Focusing on the problem that the co-frequency interference of the downlink channels in multi-cell of multi-out multi-input (MIMO) systems, this paper used the adaptive network precoding based on the SJNR to reduce the inter-cell interference. First of all, the adaptive precoding design based on the SJNR criteria is given. In this design, each base station use independent precoding approach to suppress adjacent inter-cell interference. And then in order to decrease the handing complex by the active way, the adaptive network precoding is attained respectively in the urban and suburb area environments, two adaptive network precoding based on SJNR are obtained respectively. Simulation results show that the inter-cell interference was obviously restrained and the system performance was improved after using the active network precoding basing on the SJNR, but also reduced processing algorithms of system.