Arbitrary Precoding with Single-Fed Parasitic Arrays: Closed-Form Expressions and Design Guidelines
Arbitrary Precoding with Single-Fed Parasitic Arrays: Closed-Form Expressions and Design Guidelines
复制标题
使用单馈寄生阵列的任意预编码：闭式表达式和设计指南
DOI：
10.1109/wcl.2014.020614.130863
复制
发表时间：
2014
影响因子：
6.3
通讯作者：
C. Papadias
中科院分区：
文献类型：
--
作者：
V. Barousis;C. Papadias
被称为电子可操纵寄生天线辐射器（ESPAR）的单馈紧凑阵列最近已经成为空间复用的新范例，其仅需要单个射频（RF）链和一些易于实现的模拟可调谐负载。除了显著的硬件节省之外，ESPAR的能力仍然有限，因为不可能找到合适的负载来在空中多路复用任何信令格式。实际上，通常负载值是通过耗时的迭代算法（例如，穷举搜索）获得的，并且只能模拟从低阶星座出现的信号的MIMO传输。本文在解决这个问题方面迈出了明确的一步，因为它为能够支持任意预编码方案的单馈ESPAR系统的设计定义了必要的指导方针。为了减轻迭代过程的需要，所提出的设计方法使用复杂的可调负载，并引入了新的封闭形式的表达式的负载和馈电电压的精确计算。
Single-fed compact arrays known as electronically steerable parasitic antenna radiators (ESPARs) have recently emerged as a new paradigm for spatial multiplexing that requires only a single radio-frequency (RF) chain and a few easy-to-implement analog tunable loads. Besides the remarkable hardware savings, the ESPAR capabilities are still limited as it is not possible to find appropriate loadings that multiplex any signaling format over the air. Indeed, commonly the loading values are obtained through time-consuming iterative algorithms, e.g. exhaustive search, and can only emulate MIMO transmission of signals emerging from low-order constellations. This paper constitutes a clear step forward in solving this problem, as it defines the necessary guidelines for the design of single-fed ESPAR systems that are able to support an arbitrary precoding scheme. To alleviate the need for iterative processes, the proposed design methodology uses complex tunable loads and introduces new closed-form expressions for the exact computation of the loads and the feeding voltage.