Resource-efficient fusion with pre-compensated transmissions for cooperative spectrum sensing - PubMed Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2015 May 8;15(5):10891-908.
doi: 10.3390/s150510891.

Resource-efficient fusion with pre-compensated transmissions for cooperative spectrum sensing

Dayan Adionel Guimarães  1 , Guilherme Pedro Aquino  2 , Marco E G V Cattaneo  3
Affiliations

Resource-efficient fusion with pre-compensated transmissions for cooperative spectrum sensing

Dayan Adionel Guimarães et al. Sensors (Basel). .

Abstract

Recently, a novel fusion scheme for cooperative spectrum sensing was proposed for saving resources in the control channel. Secondary users (SUs) simultaneously report their decisions using binary modulations with the same carrier frequencies. The transmitted symbols add incoherently at the fusion centre (FC), leading to a larger set of symbols in which a subset is associated with the presence of the primary user (PU) signal, and another subset is associated with the absence of such a signal. The decision criterion applied for discriminating these subsets works under the assumption that the channel gains are known at the FC. In this paper, we propose a new simultaneous transmission and decision scheme in which the task of channel estimation is shifted from the FC to the SUs, without the need for feeding-back of the estimates to the FC. The estimates are used at the SUs to pre-compensate for the reporting channel phase rotations and to partially compensate for the channel gains. This partial compensation is the result of signal clipping for peak-to-average power ratio (PAPR) control. We show, analytically and with simulations, that this new scheme can produce large performance improvements, yet reduces the implementation complexity when compared with the original one.

Keywords: channel inversion; clipping; cognitive radio; cooperative spectrum sensing; crest factor; decision fusion.

PubMed Disclaimer

Figures

Figure 1
Figure 1
Histogram of the noiseless received symbols for M = 3, Eb = 1, Ω = 1, C=3Eb and p = 0.3. The value of λ is for K = 1. The lower part is a rescaled version of the upper one.
Figure 2
Figure 2
Pclipp and Pout versus PAPR for 0 < C < 10, M = 3, Eb = 1 and Ω = 1.
Figure 3
Figure 3
Empirical and theoretical pdfs of the noiseless received symbols transmitted from a single secondary user (SU).
Figure 4
Figure 4
Empirical and theoretical pdfs of the noiseless received symbols from all SUs.
Figure 5
Figure 5
Theoretical and simulated ROC curves of the proposed fusion scheme for M = 3 (Top), M = 5 (Bottom), K = 1 and different clipping thresholds.
Figure 6
Figure 6
ROC curves at the fusion centre (FC) for M = 3 (Left), M = 5 (right), K = 1 (Top), K = [M/2] (Middle) and K = M (Bottom), γSU = −5 dB, γFC = 0 and −5 dB.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

References

    1. Mitola J., Maguire G.Q., Jr. Cognitive radio: Making software radios more personal. IEEE Pers. Commun. 1999;6:13–18.
    1. Hong X., Wang J., Wang C.X., Shi J. Cognitive radio in 5G: A perspective on energy-spectral efficiency trade-off. IEEE Commun. Mag. 2014;52:46–53.
    1. Akyildiz I.F., Lo B.F., Balakrishnan R. Cooperative Spectrum Sensing in Cognitive Radio Networks: A Survey. Elsevier Phys. Commun. 2011;4:40–62.
    1. Sun C., Zhang W., Letaief K. Cooperative Spectrum Sensing for Cognitive Radios under Bandwidth Constraints. Proceedings of the Wireless Communications and Networking Conference; Kowloon, Hong Kong, China. 11–15 March 2007; pp. 1–5.
    1. Zou Y., Yao Y.D., Zheng B. A Cooperative Sensing Based Cognitive Relay Transmission Scheme without a Dedicated Sensing Relay Channel in Cognitive Radio Networks. IEEE Trans. Signal Process. 2011;59:854–858.

LinkOut - more resources