Decentralized Cognitive Radio Control Based on Inference from Primary Link Control Information

作者：Huang Senhua^*; Liu Xin; Ding Zhi

来源：IEEE Journal on Selected Areas in Communications, 2011, 29(2): 394-406.

DOI：10.1109/JSAC.2011.110212

• Wireless communications
• inference for opportunistic spectrum access
• dynamic spectrum access control
• distributed algorithm
• cognitive radio networks

This work on cognitive radio access ventures beyond the more traditional "listen-before-talk" paradigm that underlies many cognitive radio access proposals. We exploit the bidirectional interaction of most primary communication links. By intelligently controlling their access parameters based on the inference from observed link control signals of primary user (PU) communications, cognitive secondary users (SUs) can achieve higher spectrum efficiency while limiting their interference to the PU network. In one specific implementation, we let the SUs listen to the PU's feedback channel to assess their own interference on the primary receiver, and adjust radio power accordingly to satisfy the PU's interference constraint. We propose a discounted distributed power control algorithm to achieve non-intrusive secondary spectrum access without either a centralized controller or active PU cooperation. We present an analytical study of its convergence property. We show that the link control feedback information inherent in many two-way primary systems can be used as important reference signal among multiple SU pairs to distributively achieve a joint performance assurance for primary receiver's quality of service.

• 出版日期2011-2