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In this paper, the authors look at the application of cognitive radio technology in vehicular networks. They explore some of the negative impacts of the vehicular environment on the operation of cognitive radios. This includes a cognitive radio operating as a secondary (unlicensed) user not detecting a primary (licensed) user and thus causing interference to that user. They also look at how cognitive radios can choose a modulation technique based on the system Signal to Interference plus Noise Ratio (SINR).
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