将混合预编码器的全连接结构转化为动态部分连接结构

A. Ortega
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引用次数: 1

摘要

混合预编码器的部分连接结构引起了人们的关注,因为它们减少了移相器的数量并消除了对射频加法器的需求。有两类局部结构,固定和动态。在固定结构中,每个射频链连接到一个天线子阵列,而在动态结构中,天线元件在射频链之间可切换。动态结构具有更多的自由度,因此提供了更好的性能,但在补偿中,每个天线需要一个开关和选择开关位置的算法。本文对最近发表的一篇论文中描述的方法进行了扩展和评论。所考虑的子数组具有可变大小,从而减少了交换机数量,用户可以接收多个流,并扩展了子数组分配问题优化的解决方案。因此,本文描述了一种将混合预编码器的全连接结构转换为动态子阵列结构的工具。由于随着RF链和子阵列数量的增加,开关位置的数量以阶乘的方式增长,因此禁止探索蛮力,因此有必要进行寻址搜索。该方法探索几种组合,并从中找出最佳组合。然而,需要一个更好的标准来选择这些组合。数值结果表明,所描述的工具在低数量RF链、小尺寸子阵列、用户接收单个流以及完全连接的模拟预编码器不计算任何矩阵反转的情况下更有用。
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Transforming the fully-connected structures of hybrid precoders into dynamic partially-connected structures
Partially connected structures for hybrid precoders have called attention because they reduce the number of phase shifters and eliminate the need for radio frequency (RF) adders. There are two categories of partial structures, fixed and dynamic. In fixed structures, each RF chain is connected to an antenna subarray, whereas in dynamic structures, the antenna elements are switchable among the RF chains. Dynamic structures have more freedom degrees and therefore, they offer better performance but in compensation, it is required one switch per antenna and an algorithm to select the switches' positions. This paper extends and comments on the methodology described in a recently published paper. The considered subarrays have a variable size so that the number of switches is decreased, users can receive multiple streams, and the solution for the subarray assignment problem optimization is also extended. Thus, a tool to transform the fully connected structure of a hybrid precoder into dynamic subarray structures is described throughout this paper. Since the number of the switches' positions grows in a factorial manner as the number of RF chains and subarrays increases, exploring brute force is prohibited, therefore an addressed search is necessary. The proposed method explores a few combinations and finds the best among them. However, a better criterion to select these combinations is required. The numerical results evidence that the described tool is more useful in scenarios with a low number of RF chains, low-size subarray, users receiving one single stream, and that the fully-connected analog precoder does not compute any matrix inversion.
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