This paper 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 paper also demonstrates the capabilities of the MATLAB R / Simulink R Model Based Design ZynqSDR workflow, and provides a case study and reference design that we feel other researchers working in this field can benefit from.
This paper evaluates the introduction of pulse shaping to RF communications between nodes in an ultra-small, wireless sensor network technology. With low power consumption crucial, and in the context of a digital transceiver which utilizes Manchester encoding to reduce the synchronization overhead, we consider the addition of pulse shaping filters to an existing on-off keyed transmission scheme. Pulse shaping is shown to reduce spectral leakage and thereby to allow the transmit power to be reduced. These evaluations are made in the context of 125mm 3 nodes transmitting over channels of up to 30cm, with potentially poor clock oscillators and limited energy storage capacity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.