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Abstract
This article presents the research carried out in developing and targeting a novel real-time Dynamic Spectrum Access (DSA) Frequency Spread Filter Bank Multicarrier (FS-FBMC) transmitter prototype to programmable ‘ZynqSDR’ Software Defined Radio (SDR) hardware, and introduces a series of experiments used to validate the design’s ‘cognitive’ DSA capabilities. This transmitter is a proof of concept, that uses DSA techniques to enable Secondary Users (SUs) to access the band traditionally used for FM Radio broadcasting (88-108 MHz), and establish data communication channels in vacant parts of the FM Radio Primary User (PU) spectrum using a multicarrier modulation scheme with a Non Contiguous (NC) channel mask. Once implemented on the hardware, the transmitter is subjected to various FM Radio environments sampled from around Central Scotland, and it is demonstrated that it can dynamically adapt its NC transmitter mask in real time to protect the FM Radio signals it detects. A video is presented of this dynamic on-hardware spectral reconfiguration, and the reader is encouraged to view the video to appreciate the responsiveness of the design. An investigation into potential FBMC guardband sizes is carried out, with initial findings indicating a guardband of 200 kHz (either side of an FM Radio station) is required in order to prevent interference with the PUs. This article also demonstrates the capabilities of the MATLAB and Simulink Model Based Design Zynq-Based Radio workflow, and provides a case study and reference design that we feel other researchers working in this field can benefit from.
Highlights
T HE EXPLOSION of wireless everything in recent years has placed a strain on the Radio Frequency (RF) spectrum, and has led to the so-called ‘spectrum crunch,’ where the spectrum is described as being nearly at capacity
This article presents the work carried out in targeting the novel Frequency Spread Filter Bank Multicarrier (FS-FBMC) transmitter to programmable ZynqSDR hardware using various tools provided by MathWorks and Xilinx software, and introduces a series of experiments used to validate the design’s Dynamic Spectrum Access (DSA) capabilities
This article has presented the practical work carried out in targeting the novel FS-FBMC Secondary Users (SUs) Radio prototype, initially presented in [17], to programmable ZynqSDR hardware, using various tools provided by MathWorks and Xilinx software
Summary
T HE EXPLOSION of wireless everything in recent years has placed a strain on the Radio Frequency (RF) spectrum, and has led to the so-called ‘spectrum crunch,’ where the spectrum is described as being nearly at capacity. They are able to diffract around objects such as hills and human-made structures, and have high levels of penetration through buildings This band would be perfectly suited for use as a SU IoT Wide Area Network (WAN) broadcast channel; either downlink only, used for applications such as Demand Side Management (DSM) for energy smart grid balancing; or for regional transmit/ receive IoT communications, operating in Time Division Duplexing (TDD) mode with ‘resource blocks,’ similar to how a TDD LTE/NR basestation operates. A companion video is presented with this article It provides information on the system design and the tests described and allows the reader to see the radio dynamically reconfiguring its spectral mask in real time as it adapts to the changing RF environment.
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