Abstract: In view of interference among cells and users in cooperative MIMO system, precoding schemes based on a criterion are often adopted. However, the single target will cause an unbalanced performance. In order to optimize overall system performance, a precoding scheme is proposed under a unified framework. Based on the convex optimization theory, Lagrange equation is applied to the proposed algorithm solution. It is observed that the algorithm in objectivet function convergence speed and the capacity of the system has certain advantages. The simulation results demonstrate the feasibility of the proposed scheme.

Key words: Multiple Input Multiple Output（MIMO）, precoding, multi-user, cooperative

摘要： 针对在协作MIMO系统中多小区及多用户间的干扰对系统性能的影响，一般都会基于某种设计准则进行预编码处理，但是由于设计目标的单一性会导致系统性能的不均衡，为了优化系统的整体性能，均衡各种性能指标，提出了统一数学框架下的预编码方案，并基于凸优化理论借助拉格朗日方程给出了预编码矩阵的求解方法。经仿真证明，算法在目标函数的收敛速度以及系统容量方面具有一定的优势，表明了所提方案实施的可行性。

关键词: 多输入多输出, 预编码, 多用户, 协作