An Architecture for Coexistence with Multiple Users in Frequency Hopping Cognitive Radio Networks
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The radio frequency RF spectrum is a limited resource. Spectrum allotment disputes stem from this scarcity as many radio devices are con confined to a fixed frequency or frequency sequence. One alternative is to incorporate cognition within a configurable radio platform, therefore enabling the radio to adapt to dynamic RF spectrum environments. In this way, the radio is able to actively observe the RF spectrum, orient itself to the current RF environment, decide on a mode of operation, and act accordingly, thereby sharing the spectrum and operating in more flexible manner. This research presents a novel framework for incorporating several techniques for the purpose of adapting radio operation to the current RF spectrum environment. Specifically, this research makes six contributions to the field of cognitive radio 1 the framework for a new hybrid hardwaresoftware middleware architecture, 2 a framework for testing and evaluating clustering algorithms in the context of cognitive radio networks, 3 a new RF spectrum map representation technique, 4 a new RF spectrum map merging technique, 5 a new method for generating a random key-based adaptive frequency-hopping waveform, and 6 initial integration testing toward implementing the proposed system on a field-programmable gate array FPGA.
- Radio Communications