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In this paper, we investigate the effective capacity of a secondary user in Nakagami-m fading channels, where the secondary user has no channel side information and transmits with a pre-defined rate r. By analyzing the optimal transmission rate r∗, the maximum effective capacity is obtained. The results show that effective capacity becomes smaller if the delay QoS constraint is tightened up. Moreover,...
Opportunistic Spectrum Access (OSA), where cognitive radios opportunistically access spectrum bands currently unused by primary users, can significantly enhance the spectrum utilization. The more channels sensed, the more spectrum opportunities. As such, the more sensing time spent, the less transmission time. Thus, there is a tradeoff between spectrum sensing and data transmission. A natural question...
Cognitive radio (CR) is proposed as a promising solution to resolve the spectrum resource scarcity. The premise to implement CR is not to introduce harmful interference to the licensed users (LU). This constraint makes interference estimation becoming very important. In this paper, we perform a quantitative analysis of theaggregation interference at the LU's receiver. We develop two multi-cell models...
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