Proactive Frequency-Hopping Dynamic Spectrum Access Against Asynchronous Interchannel Spectrum Sensing

• Published in: IEEE transactions on vehicular technology Vol. 62; no. 8; pp. 3614 - 3626
• Main Authors: Gu, Junrong, Jeon, Wha Sook, Kim, Jae Moung
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2013; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Asynchronous interchannel spectrum sensing; cognitive radio (CR); Complexity theory; Cryptography; Delay; Disturbances. Regulation. Protection; Dynamic programming; dynamic spectrum access (DSA); Electrical engineering. Electrical power engineering; Electrical power engineering; Exact sciences and technology; Information, signal and communications theory; Interference; Power networks and lines; proactive frequency hopping (FH); Sensors; Signal and communications theory; Signal representation. Spectral analysis; Signal, noise; Switches; Switching and signalling; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Performance evaluation; Optimal policy; Information rate; cognitive radio (CR); proactive frequency hopping (FH); Power system security; Information transmission; Frequency hop communication; Switching; dynamic spectrum access (DSA); Electrical network; Spectrum analysis; Asynchronous interchannel spectrum sensing; Security of data; Digital signature; Public key cryptography; System simulation; Frequency spectrum; Delay time; Dynamic programming; Signal analysis; Software radio
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2013.2246595

In the frequency-hopping-based dynamic spectrum access (FH-DSA) methods, both reactive and proactive channel switching (CS) schemes are widely adopted. However, when they are coupled with asynchronous interchannel spectrum sensing (moments), there are at least two drawbacks in these CS schemes, i.e., producing more interference to a primary user (PU) and fewer throughputs to a secondary user (SU). Therefore, to overcome these two drawbacks, we propose a proactive FH-DSA method against asynchronous interchannel spectrum sensing with reduced interference to the PU, while enhancing the SU throughput by eliminating the spectrum sensing time overhead during CS. The optimal FH policy is obtained by formulating proactive FH-DSA in the dynamic programming framework. Furthermore, we derive the theoretical average interference and the bound of average delay under the proposed FH-DSA. Based on them, while considering the tradeoff between exploration and exploitation, and the practical requirements for interference and throughput, we propose one extension which proactively takes FH subject to an interference constraint to further reduce interference. The complexity of the proposed schemes is also analyzed. Finally, simulation results show the performance improvement of the proposed schemes.