分布式MIMO CR系统预编码与功率分配的联合优化

Distributed MIMO CR system optimum by jointing precoding and power allocation

分布式MIMO CR系统中,构建多用户功率分配的非合作博弈模型,使认知用户速率达到均衡状态。受授权用户和多用户干扰的影响,认知用户速率很难达到理想值。为了解决上述问题,在发射端设置了适用于不同约束条件的预编码矩阵,提出了预编码与功率分配的联合优化算法。仿真结果表明,基于块对角化的联合优化算法,有效消除用户之间的信道干扰,显著提高了认知用户速率。

In distributed MIMO CR system, secondary users＇ information rates can reach equilibrium by constructing a non-cooperative game model of muhi-user power allocation. However, it is difficult for each secondary user to achieve the ideal information rate owing to constraints by primary users and muhi-user interference. In order to solve the above problem, a jointing precoding and power allocation algorithm is proposed, which optimizes the power allocation by setting precoding matrices at the transmitter of each secondary user. Simulation results show that the precoding method based on block diagonalization, effectively eliminates channel interference between users, and significantly improves secondary users＇ information rates.