Resource Allocation for OFDMA-Based Cognitive Radio Multicast Networks With Primary User Activity Consideration

Date Added: May 2010
Format: PDF

This paper considers the primary user activity or the subchannel availability in optimally distributing the available resources for an Orthogonal Frequency-Division Multiple-Access (OFDMA) cognitive radio multicast network. For this purpose, a risk-return model is presented, and a general rate-loss function, which gives a reduction in the attainable throughput whenever primary users reoccupy the temporarily accessible subchannels, is introduced. Taking the maximization of the expected sum rate of secondary multicast groups as the design objective, an efficient joint subcarrier and power-allocation scheme is proposed.