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For L-band micro satellite on board SAR system, the suitable chirp signal generator for this system is needed. In this paper, the chirp signal generator with direct digital synthesizer (DDS) is considered instead of the memory map based chirp signal generator. Furthermore, to overcome the limitation of clock frequency of the space component, parallelized DDS (PDDS) method is used. However, phase error...
In TV-band white space, the digital television (DTV) spectrum always make free or no-use spectrum when performing its actions in its spectrum range. So that, TV band devices (TVBDs) wishes to use this spectrum but not cause the harmful interference to DTV system. Besides, DTV spectrum can tolerate the interference from other system with their threshold. The sharing spectrum regulation that guarantee...
Cognitive Radio (CR) have been proposed as a method that improving the spectrum usage for more efficient. However, when sharing spectrum with others communication system, the most important thing is how much interference cause harmful to them. With TV-band also, the digital television (DTV) can tolerate the interference from other system with their threshold. The sharing spectrum regulation that guarantee...
This paper is a study on radio interference undertaken to determine the possibility of coexistence for the European-enabled broadcast service DVB-T2 (Digital Video Broadcasting -Second Generation Terrestrial), a primary first user in TV white space, and IMT-Advanced LTE-based WSD (White Space Device) installed with spectrum cognitive function. To this end, a variety of transmission parameters were...
In this paper, we propose the method that estimates the power level for each subcarrier in one multicarrier system. According to interference analysis, the power levels are assigned with suitable values. Based on the Cognitive Engine implementation, all parameters will be configured and driven to reach the optimal goal. In order to enable dynamic spectrum access (DSA), this approach will attempt to...
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