Adaptive resource allocation in multi-user OFDM-based Cognitive Radio systems

Cognitive Radio (CR) is a promising concept for improving the utilization of scarce radio spectrum resource. OFDM is considered as a well-matched technology for CR systems. Resource allocation is a vital task in such systems. In this paper, we model the problem of subcarrier, bit and power allocation for multi-user OFDM-based CR systems with imperfect spectrum detection and mutual interference consideration. Based on this model, we propose three...