基于SJNR准则抑制多小区间干扰的自适应网络预编码研究*

针对多输入多输出（MIMO）多小区协作系统中下行链路的同频干扰问题，利用基于SJNR准则的自适应网络预编码，通过基站协作有效地对抗小区间干扰。首先给出了基于SJNR准则的自适应预编码设计，该方案可以在各基站采用独立的线性预编码技术对小区间干扰进行有效抑制，然后分为市区和郊区两种情况分别得到基于SJNR准则的自适应网络预编码。仿真结果表明，采用该方案有效地抑制了小区间干扰，系统性能有明显改善，同时还降低了系统的复杂度。

Research of adaptive network precoding based on SJNR for inter-cell interference mitigation

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