A Baseband Wireless Spectrum Hypervisor for Multiplexing Concurrent OFDM Signals
A Baseband Wireless Spectrum Hypervisor for Multiplexing Concurrent OFDM Signals
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DOI：
10.3390/s20041101
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发表时间：
2020-02-01
期刊：
影响因子：
3.9
通讯作者：
Moerman, Ingrid
中科院分区：
文献类型：
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作者：
de Figueiredo, Felipe A. P.;Mennes, Ruben;Moerman, Ingrid
与当前网络相比，下一代无线和移动的网络将不得不处理流量负载的显著增加。这种情况需要新的方法来提高频谱效率。因此，在本文中，我们提出了一个无线频谱管理程序架构，抽象的射频（RF）前端到一个可配置的虚拟RF前端的数量。所提出的架构具有在现有的无线和移动的网络中实现灵活的频谱接入的能力，由于有限的频谱可编程性，这是一项具有挑战性的任务，即，系统必须改变给定信号的频谱特性以适应任意频率分配的能力。所提出的架构是一种非侵入式和高度优化的无线管理程序，其复用具有彼此的多个整数的参数集的若干不同且并发的基于多载波的无线电接入技术的信号，这些参数集在我们的工作中也被称为具有相关参数集的无线电接入技术。例如，所提出的架构可以复用若干Wi-Fi接入点、若干LTE基站、若干WiMAX基站等的信号。由于其能够复用具有相关参数集的无线电接入技术的信号，因此其可以例如复用LTE、5G-NR和NB-IoT基站的信号。它将射频前端抽象为可配置数量的虚拟RF前端，使得这些不同的技术可以共享相同的RF前端，从而降低成本，并通过采用致密化来提高频谱效率，一旦几个网络共享相同的基础设施或通过动态访问空闲频谱块。因此，所提出的方法的主要目标是通过有效地使用拥塞频谱带宽中的空闲间隙或通过基础设施共享采用网络致密化来提高频谱效率。我们在数学上演示了我们所提出的方法是如何工作的，并提出了几个仿真结果证明其功能和效率。此外，我们还设计并实现了一个开源和免费的概念验证原型，研究人员和开发人员可以使用它来运行实验或将概念扩展到其他应用程序。我们提出了几个实验结果用于验证所提出的原型。我们证明，原型可以很容易地处理多达12个并发的物理层。
The next generation of wireless and mobile networks will have to handle a significant increase in traffic load compared to the current ones. This situation calls for novel ways to increase the spectral efficiency. Therefore, in this paper, we propose a wireless spectrum hypervisor architecture that abstracts a radio frequency (RF) front-end into a configurable number of virtual RF front ends. The proposed architecture has the ability to enable flexible spectrum access in existing wireless and mobile networks, which is a challenging task due to the limited spectrum programmability, i.e., the capability a system has to change the spectral properties of a given signal to fit an arbitrary frequency allocation. The proposed architecture is a non-intrusive and highly optimized wireless hypervisor that multiplexes the signals of several different and concurrent multi-carrier-based radio access technologies with numerologies that are multiple integers of one another, which are also referred in our work as radio access technologies with correlated numerology. For example, the proposed architecture can multiplex the signals of several Wi-Fi access points, several LTE base stations, several WiMAX base stations, etc. As it able to multiplex the signals of radio access technologies with correlated numerology, it can, for instance, multiplex the signals of LTE, 5G-NR and NB-IoT base stations. It abstracts a radio frequency front-end into a configurable number of virtual RF front ends, making it possible for such different technologies to share the same RF front-end and consequently reduce the costs and increasing the spectral efficiency by employing densification, once several networks share the same infrastructure or by dynamically accessing free chunks of spectrum. Therefore, the main goal of the proposed approach is to improve spectral efficiency by efficiently using vacant gaps in congested spectrum bandwidths or adopting network densification through infrastructure sharing. We demonstrate mathematically how our proposed approach works and present several simulation results proving its functionality and efficiency. Additionally, we designed and implemented an open-source and free proof of concept prototype of the proposed architecture, which can be used by researchers and developers to run experiments or extend the concept to other applications. We present several experimental results used to validate the proposed prototype. We demonstrate that the prototype can easily handle up to 12 concurrent physical layers.