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In OFDMA-based Cognitive Radio (CR) systems, how to deal with the time-varying nature of available spectrum resources has become a hotspot and challenging problem in resource allocation. Traditional resource allocation algorithms can not guarantee proportional rates among non-real-time CR Users (CRU) because the number of available sub-channels is smaller than that of CRUs in some OFDM symbol durations. In this paper, taking the maximizing of the sum-rate of all CRUs as the optimization objective, the authors propose a resource allocation algorithm in OFDMA-based CR systems using dual methods which can maintain statistical proportional rates among CRUs while keeping the interference introduced to Primary Users (PU) under specified thresholds.
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