Adaptive dual-radio spectrum-sensing scheme in cognitive radio networks

作者：Wang, Weiwei; Cai, Jun^*; Alfa, Attahiru S.; Soong, Anthony C. K.; Li, Simin

来源：Wireless Communications and Mobile Computing, 2013, 13(14): 1247-1262.

DOI：10.1002/wcm.1178

• cognitive radio
• spectrum sensing
• cooperative spectrum sensing
• channel efficiency
• dual radio
• Markov chain

In this paper, a novel spectrum-sensing scheme, called adaptive dual-radio spectrum-sensing scheme (ADRSS), is proposed for cognitive radio networks. In ADRSS, each secondary user (SU) is equipped with a dual radio. During the data transmission, with the received signal-to-noise ratio of primary user (PU) signal, the SU transmitter (SUT) and the SU receiver (SUR) are selected adaptively to sense one channel by one radio while communicating with each other by the other one. The sensing results of the SUR are sent to the SUT through feedback channels (e.g., ACK). After that, with the sensing results from the SUT or the SUR, the SUT can decide whether the channel switching should be carried out. The theoretical analysis and simulation results indicate that the normalized channel efficiency, defined as the expected ratio of time duration without interference to PUs in data transmission to the whole frame length, can be improved while satisfying the interference constraint to PUs. After that, an enhanced ADRSS is designed by integrating ADRSS with cooperative spectrum sensing, and the performance of ADRSS under imperfect feedback channel is also discussed.

• 出版日期2013-10-10
• 单位桂林电子科技大学