This paper introduces a theory for assessing and optimizing the multiple-input-multiple-output performance of multi-port cluster antennas in terms of efficiency, channel correlation, and power distribution. A method based on a convex optimization of feeding coefficients is extended with additional constraints allowing the user to control a ratio between the power radiated by the clusters. The formulation of the problem makes it possible to simultaneously optimize total efficiency and channel correlation with a fixed ratio between power radiated by the clusters, thus examining a trade-off between these parameters. It is shown that channel correlation, total efficiency, and allocation of radiated power are mutually conflicting parameters. The trade-offs are shown and discussed. The theory is demonstrated on a four-element antenna array and on a mobile terminal antenna.
翻译:本文介绍了一种用于评估和优化多端口集群天线的多输入多输出性能的理论,涉及效率、信道相关性和功率分配。一种基于馈送系数的凸优化方法,扩展了附加约束,允许用户控制群集辐射功率之间的比率。问题的制定使得可以同时在固定群集之间辐射功率比率的条件下优化总效率和信道相关性,从而检查这些参数之间的权衡。结果表明,信道相关性、总效率和辐射功率分配是相互冲突的参数,存在相互权衡。该理论在四元天线阵列和移动终端天线上进行演示和讨论。