By collecting diversity among multiple sensing users, cooperative spectrum sensing can overcome the channel fading effect. Usually, only the local binary decisions are available for sensing cooperation due to the limited channel bandwidth. However, in our previous work, we have shown that this strategy will either compromise diversity or signal-to-noise ratio (SNR) gain. In this paper, we will study cooperative sensing with ternary local decisions. Compared with the binary cooperative sensing, this strategy can reclaim diversity and recover the SNR loss by appropriate threshold selection.
Bibliographical noteFunding Information:
Manuscript received April 9, 2012. The associate editor coordinating the review of this letter and approving it for publication was K. K. Wong. D. Duan is with the Department of Electrical and Computer Engineering, University of Wyoming, 1000 E. University Ave., Laramie, WY 82071, USA (e-mail: firstname.lastname@example.org). L. Yang (corresponding author) is with the Department of Electrical and Computer Engineering, Colorado State University, 1373 Campus Delivery, Fort Collins, CO 80523, USA (e-mail: email@example.com). This work is in part supported by the Office of Naval Research under grant #N00014-11-1-0667. Part of the results in this paper has been presented at the IEEE International Conference on Acoustic, Speech and Signal Processing (ICASSP), Kyoto, Japan, March 2012. Digital Object Identifier 10.1109/LCOMM.2012.072012.120764
- Spectrum sensing
- ternary decisions