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Spectrum sensing is one of the key functionalities in cognitive radios which enables opportunistic spectrum access. In a cognitive radio system, secondary users need to detect the emergence of primary users as soon as possible to avoid harmful interference. In particular, sensing performance can be evaluated by detection delay and sensing overhead. Sequential detection techniques such as quickest...
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...
Sensing of orthogonal frequency division multiplexing (OFDM) signals at low signal-to-noise ratio (SNR) is of great importance for cognitive radio (CR) communications due to the wide applications of OFDM in many existing and evolving broadband wireless communications. In-band pilots, multiplexed with the data-carrying subcarriers, provides one distinct feature of OFDM signals. The objective of this...
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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