Antenna Pattern Multiplexing for Enhancing Path Diversity
Antenna Pattern Multiplexing for Enhancing Path Diversity
复制标题
用于增强路径分集的天线模式复用
DOI：
10.5772/intechopen.89098
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Saito
中科院分区：
文献类型：
--
作者：
M. Saito
在本章中，我们展示了天线方向图复用（APM）的概念，它提高了多径富衰落环境中的路径分集增益和天线方向图分集接收。我们讨论实现APM的天线类型，即，产生随时间变化的天线方向图以及减小天线尺寸和硬件成本的益处。当使用电子可操纵无源阵列辐射器（ESPAR）天线时，可以最大化益处。提出了一种利用APM分析多输入多输出（MIMO）系统各态历经容量的接收过程模型。我们推导出接收信号的模型来分析系统性能。矩阵形式的接收信号包括等效信道矩阵，该等效信道矩阵是天线方向图矩阵、每个输出的信道系数向量的乘积。遍历容量方面的数值结果表明，与传统的MIMO系统的APM建议MIMO的性能相当，特别是，到达路径的数量和天线图案的数量是足够大的。当虚拟天线之间每个天线方向图的平均SNR恒定时，遍历容量也可以等同于传统MIMO系统的遍历容量。
In this chapter, we show the concept of antenna pattern multiplexing (APM), which enhances path diversity gain and antenna pattern diversity reception in multipath rich fading environment. We discuss the types of antennas that achieve the APM, i.e., generating time-varying antenna pattern and the benefits of reducing antenna size and hardware cost. When electronically steerable passive array radiator (ESPAR) antenna is used, the benefits can be maximised. A model of receiving process is proposed for analysing the ergodic capacity of multiple-input multiple-output (MIMO) systems using APM. We derive a model of received signals to analyse the system performance. The received signal in matrix form includes an equivalent channel matrix, which is a product of antenna pattern matrix, the channel coefficient vector for each output. Numerical results in terms of ergodic capacity show the comparable performances of the proposed MIMO with APM to the conventional MIMO systems; in particular, the number of arrival paths and the number of antenna pattern are sufficiently large. Also the ergodic capacity can be equivalent to that of the conventional MIMO systems when the average SNR per antenna pattern is constant among the virtual antennas.