We consider a cognitive radio network where the primary user (PU) supports applications with multiple quality of service (QoS) requirements via orthogonal frequency division multiple access (OFDMA). To let the secondary users (SUs) be aware of PU’s QoS level, and hence provide PU with sufficient protection, we propose a spectrum-sculpting-aided PU-claiming scheme that does not demand strict PU-SU synchronization. Specifically, the PU deliberately inserts one zero-subcarrier into its subcarriers, the position of which represents the QoS requirement of the PU. Through a two-step sensing procedure, each SU then can estimate the QoS requirement and adjust its sensing or accessing strategies accordingly. Simulation results exhibit the advantages of the proposed scheme, in terms of both weighted received interference (WRI) and SU’s throughput\(^1\).
Spectrum sculpting Cognitive radio Multi-QoS OFDM PU-claiming
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